Maintenance - Boating With TR!
Contents
1. 17 If the boat is in the water Tag the ignition switch with an appropriate tag requiring the seawater inlet hose to be reconnected prior to operating engine 90 863160 1 JUNE 2003 Page 1B 17 MAINTENANCE SERVICE MANUAL NUMBER 28 Sterndrive Unit Oil Checking 1 Periodically inspect oil for water to ensure that sterndrive unit seals are not leaking 2 Check for water at bottom of gear lube monitor If a water leak is indicated the sterndrive unit must be resealed IMPORTANT If sterndrive unit has set overnight or longer check for water in sterndrive unit a Bravo l Trim sterndrive unit to full DOWN IN position 70023 a Oil fill drain plug b Sealing washer b Bravo Il and Ill Trim sterndrive unit to full UP OUT position 22101 a Oil fill drain plug b Sealing washer c Remove fill drain plug If water runs out sterndrive unit is leaking and must be resealed d Reinstall fill drain plug and torque Description Description Nm ein Page 1B 18 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE Filling IMPORTANT Position sterndrive unit in DOWN IN position so that anti ventilation plate is level If more than 59 ml 2 fl oz of oil is required to fill sterndrive unit an oil leak may exist Find and correct cause of leak before unit is placed in operation NOTE Sterndrive unit oil level is checked at gear lube monitor IMPORTANT Oil level in gear lube monitor will rise2. Exterior Surfaces 1B 8 Boat Bottom Care 1B 8 90 863160 1 JUNE 2003 Page 1B 1 MAINTENANCE SERVICE MANUAL NUMBER 28 Torque Specifications NOTE Securely tighten all fasteners not listed below Lubricants Sealants Adhesives Engine Oil Pivot points guide contact Obtain locally surfaces Steering cable Special Lubricant 101 92 802865A1 Propeller shaft Tie bar pivot points SAE 30W Engine Oil Obtain locally Steering system pivot points U joint And Gimbal Bearing Gimbal bearing 92 80287041 Grease Drive shaft U joints Coupler Engine Coupler Spline Grease U joint shaft splines and 92 802869A1 O rings Gear lube monitor High Performance Gear Lube 92 802854A1 To fill sterndrive Liquid Neoprene Clamps and terminals 92 25711 3 Steering cable 2 4 C with Teflon 92 802859A1 Propeller shaft Anti Corrosion Grease Propeller shaft 92 802867A1 Page 1B 2 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE Approved Hydraulic Steering Fluids Part Number Hydraulic Helm Steering Fluid 92 862014A1 SeaStar Hydraulic Fluid HA5430 Fluid Capacities NOTICE Unit Of Measurement Milliliters Fluid Ounces All capacities are approximate fluid measures 2602 ml 3076 ml 2839 ml 88 fl oz 104 fl oz 96 fl oz Sterndrive unit oil capacity 90 863160 1 JUNE 2003 Page 1B 3 MAINTENANCE SERVICE MANUAL NUMBER 28 Special Tools Dual Water Pick Up
3. Power Package Layup Engine Refer to appropriate Mercury MerCruiser Engine Service Manual Sterndrive 1 Lubricate the steering system Do not grease steering cable while extended Hydraulic lock could occur and cause loss of steering control a If steering cable has grease fittings Turn steering wheel until steering cable is fully retracted into cable housing Apply approximately 3 pumps of grease from a typical hand operated grease gun NOTE If steering cable does not have grease fitting inner wire of cable cannot be greased 71903 a Steering cable grease fitting A Special Lubricant 101 Steering cable 92 802865A1 b Turn steering wheel until steering cable is fully extended Lightly lubricate the exposed part of cable 71901 a Extended steering cable A Special Lubricant 101 Steering cable 92 802865A1 Page 1B 22 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE c Lubricate the steering system pivot points 71904 a Steering system pivot points Where Used Par Numb A SAE 30W Engine Oil Steering system pivot points Obtain locally d On dual engine boats Lubricate the tie bar pivot points Where Used Part Number SAE 30W Engine Oil Tie bar pivot points Obtain locally e Upon first starting engine turn steering wheel several times to starboard and then port to ensure that the steering system operates properly before getting underway 2 Lubricate the gimbal bea
4. cables from battery BEFORE working around electrical systems components to prevent injury to yourself and damage to electrical system should a wire be accidentally shorted Gas Sterndrive Routine Maintenance Each Each Every DEW Day Weekly Two Start iale Months Check sterndrive unit oil level trim pump oil ox level and steering fluid level Check water pickups for debris or marine ox growth Check water strainer and clean Check coolant level Inspect sterndrive unit anodes and replace if 50 percent eroded ft Lubricate propeller shaft and the retorque ox nut if operating in only freshwater this maintenance may be extended to every four months Only perform maintenance that applies to your particular power package e Standard models Horizon models 90 863160 1 JUNE 2003 Page 1B 5 MAINTENANCE SERVICE MANUAL NUMBER 28 Gas Sterndrive continued Scheduled Maintenance Every Every 200 300 Every Every hours hours 2 5 or3 or3 years years years years Every Annu 100 ally hours or Annually Touch up power package paint and spray with Corrosion Guard Change sterndrive unit oil and retorque connection of gimbal ring to steering shaft Check steering system and re mote control for loose missing or damaged parts Lubricate cables and linkages Inspect U joints splines and bellows Check clamps Check engine alignment Lubricate U joints splines Lubricate gimbal bearing and en
5. 0 12 pumps of grease from a typical hand operated grease gun 71346 a Grease fitting locations A UL and Gimbal Bearing Drive shaft U joints 92 802870A1 rease b Lubricate drive shaft grease fittings at engine end by applying approximately 3 4 pumps of grease from a typical hand operated grease gun CRIS 71347 a Grease fitting locations Drive shaft U joints 92 802870A1 Grease A U joint and Gimbal Bearing 7 90 863160 1 JUNE 2003 Page 1B 25 MAINTENANCE SERVICE MANUAL NUMBER 28 4 Lubricate the sterndrive U joint cross bearings by applying approximately 3 6 pumps of grease from a typical hand operated grease gun NOTE The crosses and bearings on the sterndrive U joint will need to be lubricated through the grease fittings Apply lubricant from a typical hand operated grease gun until a small amount of grease begins to push out The sterndrive unit must be removed to grease these fittings 5 Lubricate the U joint shaft splines and the O rings A Cp OTA E i A e 22026 76832 a U joint shaft splines b U joint shaft O rings c Cross bearings grease insert d Cross bearings assemblies Description Where Used Part Number U joint shaft splines and Engine Coupler Spline Grease O rings 92 802869A1 Cross bearings grease insert Page 1B 26 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE 6 Inspect U joint bellows for cracks or other signs of deterioration
6. Check bellows clamps for tightness a Rotate the bell housing in the upward and side to side directions to inspect bellows and hose clamps 76620 a U joint bellow b Exhaust bellow c Bell housing d Gimbal ring e Gimbal housing 7 Check engine alignment Refer to appropriate Mercury MerCruiser Engine Service Manual 90 863160 1 JUNE 2003 Page 1B 27 MAINTENANCE SERVICE MANUAL NUMBER 28 Power Package Recommissioning Engine Refer to appropriate Mercury MerCruiser Engine Service Manual Sterndrive 1 Perform ALL maintenance specified for completion annually in Maintenance Chart except items which were performed at the time of sterndrive layup 2 Apply a thin coat of petroleum based grease to clamps and terminals to help retard corrosion Liquid Neoprene Clamps and terminals 92 25711 3 3 After recommissioning and starting engine check steering system and shift control for proper operation 4 Check all fluid levels before and after first use Page 1B 28 90 863160 1 JUNE 2003
7. Flush Gear Case Seal Kit Use to block off the front water inlet holes on the dual 91 881150Q1 water inlet gear cases Attaches to the sterndrive unit water intakes provides a fresh water connection when flushing the cooling system or operating the engine 91 44357Q2 Use for flushing sterndrives with low water inlet gear 91 84996T 1 Senses an electrical current in the water when testing the MerCathode system Use to check hull potential 91 766751 1 Page 1B 4 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE Maintenance Schedules Maintenance Intervals Maintenance intervals and the corresponding tasks to be performed as shown in this current schedule or as found in a previously printed schedule are generally based on an average boating application and environment However individual operating habits and personal maintenance preferences can have an impact on the suggested intervals In consideration of these factors Mercury MerCruiser has adjusted some maintenance intervals and the corresponding tasks to be performed In some cases this may allow for more individual tasks in a single visit to the servicing dealer Therefore it is very important that the boat owner and the servicing dealer discuss the current Maintenance Schedule and develop appropriate maintenance intervals to coincide with the individual operating habits the environment and the maintenance requirements t Always disconnect battery
8. SERVICE MANUAL NUMBER 28 MAINTENANCE IMPORTANT INFORMATION Section 1B Maintenance Table of Contents Torque Specifications 1B 2 Anti fouling Paint 1B 9 Lubricants Sealants Adhesives 1B 2 Steering Head and Remote Approved Hydraulic Control Maintenance 1B 10 Steering Fluids 1B 3 Shift Cable 0 00000 1B 10 Fluid Capacities 1B 3 Sterndrive Water Drain Holes 1B 11 Special ToolS sis umar aceata e ac 1B 4 Sterndrive Water Pickups 1B 12 Maintenance Schedules 1B 5 Flushing Attachments 1B 13 Maintenance Intervals 1B 5 Alternative Water Pickups 1B 16 Gas Sterndrive 1B 5 Sterndrive Unit Oil 1B 18 Routine Maintenance 1B 5 CHCCKING apogee ti ada o ered te 1B 18 Scheduled Maintenance 1B 6 Filling ee 1B 19 Corrosion 0ceceeeececeeeecees 1B 7 Changing 06 e eee eee 1B 20 Maintaining Ground Power Package Layup rere ee ee 1B 22 Circuit Continuity 4 1B 7 Engine wees eee e seen sence cece 15 22 Maintaining Anodic Protection 1B 7 Sterndrive eri 18 22 Checking Quicksilver Power Package Recommissioning 15 28 MerCathode System 1B 8 abs op eee es ares i io Maintainina Power Pack erndrive ees 1B 28 g Power Package
9. and fall during sterndrive operation always check oil level when sterndrive is cool and engine is shut down NOTE Oil will purge from gear lube monitor if rubber gasket is not in cap A A A D PPERCURY T Aorere e re 3 z s III a 77813 a Gear lube monitor full line operating range 1 Fill gear lube monitor to FULL line OPERATING range 2 Ensure that rubber gasket is installed in gear lube monitor cap 3 Install gear lube monitor cap Tighten cap 1 4 turn after monitor contacts gasket IMPORTANT Do not overtighten cap 4 Check oil level in gear lube monitor 90 863160 1 JUNE 2003 Page 1B 19 MAINTENANCE SERVICE MANUAL NUMBER 28 Changing 1 Remove the gear lube monitor from the bracket HLH I iN L 77813 a Gear lube monitor Empty the contents into a suitable container Install the monitor in the bracket Bravo One Models Remove the propeller place the sterndrive unit in full trim limit IN position remove the oil fill drain screw and sealing washer and drain the oil 70568 a Oil fill drain b Sealing washer 5 All Other Models Place the sterndrive unit in full trim limit OUT position remove the oil fill drain screw and sealing washer and drain the oil 72522 a Oil fill drain b Sealing washer Page 1B 20 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE 6 Remove the oil vent screw and sealing washer Allow the oil to
10. anodes 6 Bearing carrier anode Bravo One Universal Anodic Plate serves as a sacrificial anode Anodic Plate serves as a sacrificial anode MerCathode System standard on Bravo Anode Kit if equipped mounted to boat transom Acts as a sacrificial anode Trim Cylinder Anodes mounted on each trim cylinder Bearing Carrier Anode Bravo One located in front of the propeller between the front side of the propeller and the gear housing 90 863160 1 JUNE 2003 Page 1B 7 MAINTENANCE SERVICE MANUAL NUMBER 28 Checking Quicksilver MerCathode System The MerCathode system should be tested to ensure adequate output The test should be performed where boat is moored using the Reference Electrode and Test Meter Refer to Section 7 Reference Electrode Senses an electrical current in the water when testing the MerCathode system Use to check hull potential 91 7667511 Maintaining Power Package Exterior Surfaces 1 Spray entire power package at recommended intervals with Corrosion Guard Follow instructions on can for proper application Painted surfaces 92 802878 55 2 Clean entire power package External surfaces that have become bare should be repainted with Primer and Spray Paint at recommended intervals Description Where Used Part Number ae 92 802878 52 Mercury Phantom Black nie Mn 92 802878Q 1 Boat Bottom Care To achieve maximum performance and fuel economy boat bottom MUST BE kept clean A
11. area around transom assembly NOTE Sternarive unit and transom assembly can be painted with a good quality marine paint or an anti fouling paint that does not contain copper or any other material that could conduct electrical current Do not paint drain holes anodes MerCathode system and items specified by boat manufacturer 90 863160 1 JUNE 2003 Page 1B 9 MAINTENANCE SERVICE MANUAL NUMBER 28 Steering Head and Remote Control Maintenance 1 Lubricate steering head and remote control at recommended intervals Inspect steering head and remote control for ease of operation Engine Oil Pivot points guide contact Obtain locally surfaces 1 Lubricate the pivot points and the guide contact surfaces Shift Cable 79178 Typical a Pivot points b Guide contact surfaces Description Where Used Part Number Engine Oil Pivot points guide contact Obtain locally surfaces Page 1B 10 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE Sterndrive Water Drain Holes 1 Using a piece of wire check water drain holes in sterndrive unit to ensure that they are open 78525 Sterndrive unit water drain holes a Speedometer pitot tube b Anode cavity vent hole c Anode cavity drain passage d Gear housing water drain hole 1 each port and starboard e Gear housing cavity vent hole Bravo II only 90 863160 1 JUNE 2003 Page 1B 11 MAINTENANCE SERVICE MANUAL NUMBER 28 Sterndrive Water Pickup
12. ccumulation of marine growth or other foreign matter can greatly reduce boat speed and increase fuel consumption To ensure best performance and efficiency periodically clean boat bottom in accordance with manufacturer s recommendations In some areas it may be advisable to paint the bottom to help prevent marine growth Refer to the following information for special notes about the use of anti fouling paints Page 1B 8 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE Anti fouling Paint IMPORTANT Corrosion damage that results from the improper application of anti fouling paint will not be covered by the limited warranty Painting Boat Hull or Boat Transom Anti fouling paint may be applied to boat hull and boat transom but you must observe the following precautions IMPORTANT Do not paint anodes or MerCathode System reference electrode and anode as this will render them ineffective as galvanic corrosion inhibitors IMPORTANT If anti fouling protection is required for boat hull or boat transom copper base paints if not prohibited by law can be used If using copper based anti fouling paints observe the following e Avoid an electrical interconnection between the Mercury MerCruiser product anodic blocks or MerCathode system and the paint by allowing a minimum of 40 mm 1 1 2 in UNPAINTED area on transom of the boat around these items 71176 a Painted boat transom b Minimum 40 mm 1 1 2 in UNPAINTED
13. cedure NOTE Flushing is needed only for salty brackish mineral laden or polluted water applications Flushing is recommended after each outing for best results 1 Drain the seawater section of the cooling system IMPORTANT Engines with the sterndrive water inlet blocked off at the gimbal housing and using a through the hull water inlet need a supply of cooling water available to both the sterndrive unit and to the engine during operation 2 If flushing cooling system with boat in water a Raise sterndrive unit to TRAILER position b Install appropriate flushing attachment over the water intake openings in the gear housing c Lower sterndrive unit to full DOWN IN position d Proceed to Step 4 3 If flushing cooling system with boat out of water a Lower sterndrive unit to full DOWN IN position Contact with moving drive components and the propeller can cause personal injury or death To avoid possible injury remove the propeller and ensure that no people or animals are in the area of the drive unit while flushing b Remove propeller c Install appropriate flushing attachments over water inlets gear housing 4 Connect hose between flushing attachment and water source 5 Disconnect the water inlet hose upper hose from the aft side of the seawater pump aN ee pl Aes Rx ieee eA 4 77945 6 Plug the seawater inlet hose or close the seacock to prevent water from siphoning into the boa
14. drain completely a Oil vent screw b Sealing washer IMPORTANT If any water drained from the oil fill drain hole or if the oil appears milky the sterndrive unit is leaking and should be checked immediately by your authorized Mercury MerCruiser dealer 7 Lower the sterndrive unit so that the propeller shaft is level Fill the sterndrive unit through the oil fill drain hole with specified gear lube until an air free stream of lubricant flows from oil vent hole High Performance Gear Lube Gear lube monitor 92 802854A1 IMPORTANT Use only High Performance Gear Lube in sterndrive unit 8 Install the oil vent screw and sealing washer 9 Continue to pump gear lube into the gear lube monitor circuit until the gear lube appears in the gear lube monitor 10 Fill the monitor so that the oil level is in the operating range Do not overfill Ensure that the rubber gasket is inside the cap and install Do not overtighten High Performance Gear Lube Gear lube monitor 92 802854A1 11 Remove the pump from the oil fill drain hole Quickly install the sealing washer and oil fill drain screw Tighten securely 12 Reinstall the propeller 13 Recheck the oil level after the first use IMPORTANT Oil level in the gear lube monitor will rise and fall during sterndrive operation always check the oil level when the sterndrive is cool and the engine is shut down 90 863160 1 JUNE 2003 Page 1B 21 MAINTENANCE SERVICE MANUAL NUMBER 28
15. he engine Drain the seawater section of the cooling system Seawater cooled Models Proceed to Step 4 or Step 5 Closed Cooled models could require a through the hull or through the transom water inlet and sterndrive water inlets Verify your model as follows a If you have a Bravo sterndrive unit and closed cooling equipped with a heat ex changer on the front of the engine verify that a hose is connected between the tran som and the y fitting and between the sea strainer and the y fitting b If there is a hose running to the transom shut the seacock located in the hose be tween the sea strainer and the y fitting Proceed to Step 4 or Step 5 c If there is not a hose running to the transom refer to Alternative Water Pickups 4 If flushing the cooling system with boat in water a Raise sterndrive unit to TRAILER position b Install appropriate flushing attachments over water intake openings in the gear housing c Lower sterndrive unit to full DOWN IN position 5 If flushing cooling system with boat out of water a Lower sterndrive unit to full DOWN IN position Contact with moving drive components and the propeller can cause personal injury or death To avoid possible injury remove the propeller and ensure that no people or animals are in the area of the drive unit while flushing b Remove propeller c Install appropriate flushing attachments over water intlets in gear housing Connect hose between f
16. lushing attachment and water source With sterndrive unit in normal operating position partially open water source about 1 2 maximum Page 1B 14 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE 8 Place sterndrive in NEUTRAL idle speed position and start engine Suction created by the seawater pickup pump may collapse the flushing water hose causing the engine to overheat Avoid engine damage from overheating Do NOT operate the engine above 1500 rpm 9 Slowly advance throttle until engine reaches 1300 rpm 100 rpm Engine overheating can cause engine damage To avoid observe the water temper ature gauge and ensure that the engine is operating in the normal range 10 Observe the water temperature gauge to ensure that the engine is operating in the normal range 11 Operate engine with sterndrive in NEUTRAL for about 10 minutes or until discharge water is clear 12 Slowly return throttle to idle speed position 13 Stop engine 14 Shut off water and remove flushing attachment 15 Remove the seawater inlet hose from the seawater pump and plug the hose to prevent water from siphoning into the engine 16 Tag the ignition switch with an appropriate tag requiring the seawater inlet hose to be reconnected prior to operating engine 90 863160 1 JUNE 2003 Page 1B 15 MAINTENANCE SERVICE MANUAL NUMBER 28 0195 2 Alternative Water Pickups IMPORTANT Two water sources are needed for this pro
17. ring and the sterndrive propeller shaft a Lubricate gimbal bearing by applying approximately 8 10 pumps of grease from a typical hand operated grease gun 77068 a Gimbal bearing grease fitting A Ie Anat a Gimbal bearing 92 802870A1 rease 90 863160 1 JUNE 2003 Page 1B 23 MAINTENANCE SERVICE MANUAL NUMBER 28 b Apply a liberal coat of one of the following lubricants to the propeller shaft 72239 a Propeller shaft Where Used Part Number Anti Corrosion Grease 92 802867A1 Special Lubricant 101 Propeller shaft 92 802865A1 2 4 C with Teflon 92 802859A1 3 Lubricate engine coupler splines through grease fittings on coupler by applying approximately 8 10 pumps of grease from a typical hand operated grease gun NOTE If equipped with a sealed engine coupler the sealed coupler and shaft splines can be lubricated without removing the sterndrive unit Apply lubricant from a typical hand operated grease gun NOTE If the boat is operated at idle for prolonged periods of time or if used in heavy boat applications Bravo model aluminum coupler should be lubricated every 50 hours 79177 Steel Coupler Aluminum Coupler a Engine coupler grease fitting Where Used Part Number Engine Coupler Spline Grease 92 802869A1 Page 1B 24 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE a Drive shaft extension models Lubricate the drive shaft grease fittings at transom end by applying approximately 1
18. s IMPORTANT Bravo models equipped with closed cooling require dual water pickups and must be equipped with a through the hull or through the transom pickup in addition to the sterndrive water inlets There are 3 types of water pickups available on Mercury MerCruiser sterndrives low water dual water and side pickups Dual water pickups require the Flushing Device 92 44357Q2 and the Dual Water Pick Up Flush Gear Case Seal Kit 92 881150Q1 low water pickups require the Flushing Kit 92 849996T1 and side pickups require the Flushing Device 92 44357Q2 Dual water pickup Low water pickup Side pickup Page 1B 12 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE FLUSHING ATTACHMENTS Dual Water Pick Up Flush Gear Case Seal Kit Use to block off the front water inlet holes on the dual 91 881150Q1 water inlet gear cases Attaches to the sterndrive unit water intakes provides a fresh water connection 91 44357Q2 when flushing the cooling system or operating the engine Use for flushing sterndrives with low water inlet gear 91 84996T 1 90 863160 1 JUNE 2003 Page 1B 13 MAINTENANCE SERVICE MANUAL NUMBER 28 0194 2 NOTE Flushing is needed only for salty brackish mineral laden or polluted water applications Flushing is recommended after each outing for best results If flushing with the boat in the water seawater can flow into the engine causing en gine damage Water inlet must be closed when flushing t
19. t Page 1B 16 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE 7 Using a suitable adapter connect the flushing hose from the water source to the water inlet of the seawater pump Overheating from insufficient cooling water will cause engine and drive system damage Ensure that there is sufficient water always available at water inlet holes during operation 8 With sterndrive unit in normal operating position partially open the 2 water sources about 1 2 maximum 9 Place sterndrive in NEUTRAL idle speed position and start engine Suction created by the seawater pickup pump may collapse the flushing water hose causing the engine to overheat Avoid engine damage from overheating Do NOT operate the engine above 1500 rpm 10 Slowly advance throttle until engine reaches 1300 rpm 100 rpm Engine overheating can cause engine damage To avoid observe the water temper ature gauge and ensure that the engine is operating in the normal range 11 Observe the water temperature gauge to ensure that the engine is operating in the normal range 12 Operate engine with sterndrive in NEUTRAL for about 10 minutes or until discharge water is clear 13 Slowly return throttle to idle speed position 14 Stop engine 15 Shut off water and remove flushing attachments 16 If the boat is out of the water Install the water inlet hose to the aft side of the seawater pump Tighten the hose clamp securely
20. x gine coupler Check continuity circuit for loose or damaged connections Test MerCathode unit output on Bra vo Models Only perform maintenance that applies to your particular power package e Standard models Horizon models 8 Lubricate engine coupler every 50 hours if operated at idle for prolonged periods of time or if used in heavy boat applications Later standard models can be serviced every 200 hours or 3 years Page 1B 6 90 863160 1 JUNE 2003 SERVICE MANUAL NUMBER 28 MAINTENANCE Corrosion Refer to the Mercury Precision Parts Marine Corrosion Protection Guide 90 881813003 Maintaining Ground Circuit Continuity The transom assembly and sternarive unit are equipped with a ground wire circuit to ensure good electrical continuity between engine transom assembly and sterndrive components Good continuity is essential for the MerCathode System to function effectively Refer to Section 7 Maintaining Anodic Protection Each sterndrive unit is equipped with a sacrificial anodic plate to help protect underwater metal parts from galvanic corrosion Because of its self sacrificing nature anodic plate MUST BE replaced if eroded 50 or more Refer to Section 7 IMPORTANT Replace sacrificial anodes if eroded 50 percent or more 73919 Common sacrificial anodes and MerCathode system 1 Universal anodic plate 2 Anodic plate 3 MerCathode system 4 Anode kit if equipped 5 Trim cylinder
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