Job Sheet 171 Wheel Bearing Service
Contents
1. Wheel Bearing Serviceable Type Inspection and Service Name gt gt o Satono i Date NATEF Correlation This Job Sheet addresses the following NATEF task s 5 F 1 Diagnose wheel bearing noises wheel shimmy and vibration concerns determine necessary action P 1 5 F 2 Remove clean inspect repack and install wheel bearings and replace seals install hub and adjust bearings P 1 5 F 6 Replace wheel bearing and race P 2 4 D 2 Remove inspect and service or replace front and rear wheel bearings P 1 Performance Objective s Upon completion of this Job Sheet you will be able to properly inspect diagnose and test the driveabil ity concerns and noises related to wheel bearings You will also be able to properly remove service and install wheel bearings serviceable type Tools and Materials Service manual Technician s tool set Wheel bearing packer Wheel bearing grease Seal remover Seal driver Parts washer Dust cap remover Slide hammer New cotter pin set Protective Clothing Equipment Goggles or safety glasses with side shields Describe the vehicle being worked on 625 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 171 PROCEDURE 1 10 Describe the noise that a bad wheel bearing will make during a test drive Test drive the vehicle in an open parking lot Do2. a wheel bearing dust cap 12 Remove the cotter pin nut thrust washer and outer bearing Place the parts in order on a clean shop towel or bench Task Completed Thrust washer Nut lock n Outer bearing T Nut Grease seal Inner bearing Cengage Learning 2012 Hub and disc Cotter pin Figure 60 33 Parts of the wheel bearing assembly 13 Remove the rotor and hub assembly Place the hub on the bench with the inside facing up Task Completed 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted 628 Job Sheet 171 14 Using the seal remover or a flat screwdriver and a prybar remove the inner oil seal Task Completed Tim Gilles Figure 60 43 a Using a screwdriver to remove a bearing b A seal removal tool 15 Remove the inner bearing Task Completed 16 Clean the bearings and the hub with a parts washer Dry the parts using low pressure compressed air Task Completed Note Do not use compressed air to spin the bearings to dry them 17 Inspect the bearing rollers cage and races for pitting corrosion spalling brinelling signs of over loading and signs of overheating Describe how the bearings look Bearing rollers and cage iAneriace Cup outer race Outer race pe 7 Roller Cone inner race Lips Chicago Rawhide Tim Gilles Figure 60 16 A tapered roller bearing h
3. its bore 0 Pound the seal flush with the top of the bore Tim Gilles 21 Clean and check the spindle for damage What did you find Tim Gilles Sealing area Figure 60 54 Clean the sealing area on the spindle so that the new seal is not accidentally ruined 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 171 631 22 Install the rotor outer bearing washer and nut Task Completed 23 With the wheel rotating tighten the adjusting nut to the manufacturer s specification use 17 25 b ft of torque if no specification is available Task Completed 24 Why is this preload needed 25 Back the adjusting nut off turn the rotate the hub 1 4 turn Task Completed 26 Tighten the adjusting nut to the second torque specification use 24 28 in lb if no specification is available Task Completed EN KS Ww SY Nas With wheel rotating Back adjusting nut tighten adjusting nut off 1 2 turn then to 17 25 foot pounds rotate hub 1 4 turn A KN DOY Ys Tighten adjusting nut Install the retainer to 24 28 inch pounds and a new cotter pin Ford Motor Company Figure 60 35 Typical wheel bearing adjustment directions 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted 632 Job Sheet 171 27 Install the reta
4. as lips on the inside and outside edges of the inner bearing race Figure 60 15 Tapered roller bearing construction 18 Based on your inspection should the bearings be replaced 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 171 629 19 Place the old bearings or new bearings if required in the bearing grease repacker Insert new grease into the bearing repacker until grease starts to come out of the bearing Coat the outside of the bear ing with grease and reinsert it into the race Note If you do not have a bearing repacker force grease into the wheel bearing by holding a large amount of grease in one hand then using your other hand to move the bearing into it Task Completed Tim Gilles Figure 60 51 Apply grease until ribbons of grease start to appear at the opposite ends of the bearing 20 Reinstall the new inner seal using the proper adapter with the open side of the sealing lip facing the lubricant Note The seal should be flush with the top of the bore Task Completed Garter spring keeps tension on the sealing lip Cengage Learning 2012 Sealing lip Figure 60 28 A lip seal 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted 630 Job Sheet 171 Figure 60 56 a Select the correct adapter and position the seal over
5. es the vehicle make any bearing related noise while going in a straight direction only Make several low speed turns in both directions Does the vehicle make any bearing related noises while turning Does the bearing noise seem to get louder when turning one way or another Can you isolate if the noise is coming from the front or rear Bring the vehicle back to the shop and hoist it up in the air Based on your test drive experience can you determine a bad wheel bearing With the tires off the ground turn each wheel by hand Listen and feel for the wheel bearing Task Completed Rock the tire back and forth to check for looseness or play Use the manufacturer s service manual as a guide Is this looseness normal Remove the wheels and check for signs of seal leakage Task Completed Note Steps 10 15 are for removing inspecting and repacking a wheel bearing assembly Steps 16 20 are for removing inspecting and replacing a sealed hub bearing assembly Remove the disc brake caliper and hand it to the side Task Completed 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 171 627 11 Using the dust cap pliers remove the dust cap It is usually recommended to replace the dust cap Match the old one with the new one if available Task Completed Tim Gilles Figure 60 36 A special tool used for removing
6. iner and a new cotter pin Task Completed Cengage Learning 2012 Figure 60 39 Cotter pin installation Tim Gilles Wrong Figure 60 40 The right a and wrong b ways to install a cotter pin 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 171 633 28 Pack the dust cap about full of grease Pack grease into the hollow portion of the hub but do not fill it completely Task Completed Pack grease into the hollow portion but do not fill it completely Cap Pack in grease to about 1 3 of cap capacity Bearing inner races Smear grease lightly on bearing races Figure 60 53 Partly fill the hub with grease Cengage Learning 2012 29 Reinstall the wheel Torque it to specifications Task Completed Problems Encountered INSTRUCTOR EVALUATION O 4 Mastered Task O 3 Able to Perform Task Independently Some Additional Training Suggested O 2 Able to Perform Task with Close Supervision Requires Additional Training O 1 Unable to Perform Task O O Not Attempted Comments Instructor Name _ C t Instructor Signature 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted
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