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1. TRU TIME CAM GEARS Mitsubishi 1995 2001 Eclipse 2 4L SOHC Part Number 23 852 WARNING This installation is not for the mechanically challenged If you are not mechanically inclined or do not understand the procedure please do not attempt the installation Refer the installation to a reputable mechanic It is highly recommended to purchase the factory service manual to use as a guide along with these instruction sheets Legal in California ONLY for racing vehicles which may never be used upon a highway ADVANCED ENGINE MANAGEMENT INC 2205 126 St Unit A Hawthorne CA 90250 310 484 2322 Http www aempower com Instruction part 10 261 Copyright 2001 You have just purchased the BEST adjustable cam sprockets available These AEM Inc billet aluminum adjustable cam sprockets are CNC machined from billet aluminum and then laser etched with cam timing marks for adjustment up to 10 at the cam or 20 at the crankshaft Using the vernier scale on the sprocket hub helps to do the cam timing changes quickly and accurately The inner hub is anodized for lasting beauty and resistance to corrosion The out gear sector is hard anodized for resistance to wear We have found that there are significant power gains to be made by adjusting the cam timing even with stock cams and compression Adjustable cam sprockets are usually required in applications where an aftermarket or reground performance cams are installed or2. b Make sure that the timing mark on the gear c is set up at 0 and tighten the bolts Install the gear on to the camshaft Tighten the bolts to the proper factory specification 65 ft lbs Hold the camshaft at the hex flats as you tighten the gear TIMING MARKS CAMSHAFT SPROKET i 4 1 Wo a BAN WAN TA an RU HA j SS jf 9 jj S T a 4 4 SSS a TIMING MARK CAMSHAFT SPROCKET TIMING MARK TOP OF CYLINDER HEAD TIMING MARK OIL PUMP SPROCKET TIMING MARK CRANKSHAFT SPROCKET N CYLINDER BLOCK Figure 2A 2B 2C amp 2D 8 Installing timing belt a b c Install the timing belt on the camshaft Make sure that the gear is at the proper position with the pin straight up and the alignment marks are horizontal timing belt tensioner i From beneath remove the automatic belt tensioner ii On a vise compress the tensioner until the hole in the shaft aligns with the hole in the tensioner body 1 This procedure should be done over a 15 minute period to allow the tensioner to bleed down If you compress the tensioner down too fast you may damage it internally please see the factory service manual iii Once the tensioner has been compressed and the holes are aligned insert the inch pin into the holes to lock the tensioner in place Complete installing the belt on to the lower pulleys i Ensure that all the
3. the cylinder head has been milled 0 005 or more The use of these cam sprockets allows the extraction of maximum power from your engine We have recorded gains of up to 10 15 horsepower due to cam timing tuning using adjustable cam sprockets When an aftermarket or reground cam is installed the original manufacturer s cam timing specifications are no longer accurate The adjustable cam sprocket allows you to make necessary adjustments to cam timing to maximize the performance of your engine This is accomplished by degreeing in the optimum cam timing for a particular engine set up The adjustable cam sprocket is especially effective when used with heads that have been milled The adjustability of the sprocket allows the accommodation of the changes in cam timing due to the variation of timing belt length from the bottom sprocket to the top sprocket when the head is milled If the head has been milled 0 005 or greater the relationship between the head and the block is altered by moving the head closer to the crankshaft resulting in retarded cam timing lt must be emphasized that the preceding descriptions are generalizations and any adjustments made must be done with a conservative approach and on a dynamometer or on a racetrack We do not condone any illegal activity on the street The AEM Billet Aluminum Cam Sprockets are available for Read and understand these instructions BEFORE attempting to install this product See reference
4. timing marks are in their proper position after the belt is installed Any deviation from these procedures can lead to serious engine damage Install the timing belt tensioner 9 Resetting the tension pulley a b Install the automatic tensioner in place With a suitable tool rotate the tension pulley counter clockwise and apply 3 ft lbs to the center eccentric while tightening the fixing bolt Do not allow the eccentric to rotate with the center bolt as you tighten it refer to factory service manual Let the automatic tensioner to sit for 15 minutes then measure the amount of protrusion of the auto tensioner It should be 3 8 4 5 mm if not repeat the pulley adjustment procedures d Tighten the adjustment bolt of the cam gear to 15 ft lbs Remove the lock pin for the oil pump shaft described step 5f TENSIONER i Rotate the crankshaft by hand in the normal direction of engine rotation at the crankshaft 1 Do this several times and make sure you do not feel any resistance to rotation a The crankshaft should rotate freely with the spark plugs removed If resistance is encountered check to see that the timing marks on all the pulleys line up when the crankshaft is at TDC and or that the oil pump shaft is not locked 2 Check the timing marks for both the camshaft and crankshaft with each revolution and that the oil pump shaft marks line up every third revolution Failure to ensure that engine is in proper time w
5. et crankshaft camshaft timing marks are lined up with reference marks on the front engine cover 1 It is important to examine the oil pump pulley as the mark is not very easily seen it may be obscured by dirt The mark is a reverse embossed dot with white paint on it Loosen the center bolt on the cam gear i The bolt is installed at 65 ft lbs of torque from the factory so do not rely solely on the tension of the timing belt to hold the cam gears in position ii The camshaft have hex flats between cylinders 1 and 2 Using an appropriately sized wrench hold the camshaft at the hex flats as you loosen the cam gear s center bolt Loosen the timing belt fixing bolt to relieve the tension on the timing belt Remove the timing belt from the cam gear This is an appropriate time to replace the timing belt if replacement is due or is close to the replacement interval Remove the OE cam gear camshaft After removing the belt align the oil pump sprocket with the previously identified marks on the front of the engine i Remove the plug on the rear side of the engine block and insert an 8mm rod into the hole to lock the pump shaft in position 1 The oil pump shaft also includes the counter balance shaft This shaft needs to be locked in place during the installation of the timing belt from the 7 Installing the Tru Time Cam Gears a Remove the cam gear from the packaging and lay it down on a flat surface
6. ill result in engine damage 10 Assembly of engine components a Once the timing belt is installed and cam timing verified the assembly of the motor is the reverse of the procedures just outlined 11 Cam timing adjustment procedures a The performance of an aftermarket cam can be optimized by using the AEM cams gears by degreeing in the proper cam timing for your particular engine set up This procedure is best carried out on a dynamometer so that quantifiable results can be measured The advancing or retardation of cam timing will affect the peak power of the engine by moving the power band up or down Usually advancing the cam gives more low end power and conversely retarding the cam timing gives a higher peak rom and power We must emphasize that this is only a generalization and that you must perform dyno track testing to fully realize the benefit of these sprockets In the absence of a dyno timed acceleration tests can be performed We do NOT condone illegal activity on the street and STRONGLY recommend the timed acceleration tests be carried out at a racetrack The method we use to perform the timed tests is to start at a constant engine RPM in second gear both for manual and automatic transmission and then accelerate to the vehicle redline while recording the time it takes to reach redline We perform this test at least 3 times to establish an average reference point Notice that there is no shifting or tire burning if you d
7. l mixture and if it is not optimized for each cam timing setting you will not know if the effect of the change in cam timing is positive or negative f When you have concluded testing re check the cam bolts for tightness apply Loctite red to the three retaining bolts re install the cam belt cover and know that you have installed the best cam timing sprocket available Caution Cam adjusting bolts loose Tighten before starting engine For Technical Inquiries please E Mail us at Tech aempower com Reference _ Figure 1 1 Drive Belt Power steering Oil Pump and A C 2 Drive Belt Alternator 3 Water Pump Pulley 4 Crank Shaft Pulley 5 Timing Belt Upper Cover Assembly 6 Timing Belt Lower Cover Assembly 7 Timing Belt 8 Tensioner Pulley ee 9 Auto Tensioner Figure 2A _ Diagram showing the relationship of the pulleys when cylinder no 1 is at TDC on compression Figure 2B Diagram showing the location of the timing belt tensioner fixing bolt Figure2C Diagram showing the location of all timing marks at TDC Figure 2D Diagram showing the location of the plug on the rear side of the engine block Secondary ee diagram shows the balance shaft in its proper position Figure 3 Diagram showing how the lock pin is to be inserted into the automatic tensioner _ Figure 4 Diagram showing how to measure the protrusion of the automatic tensioner
8. o have a traction problem use a higher gear in this procedure Using this procedure will give reliable and repeatable data b As outlined at the preface of these instructions adjustments to the cam timing must be done with a very conservative approach Excessive movement of the cams during adjustment increases the likelihood that the pistons and valves will touch c All testing should be done on a chassis dynamometer or at the test track Under no circumstance should you resort to testing on public roads d Check ignition timing Verify that the ignition timing is correct use a timing light to do this do not guess The ignition timing must be verified EACH time the cam timing is changed because the cam drives the distributor Any change to the cam timing will affect the ignition timing ii To change the cam timing loosen the three retaining bolts figure 1 in the slotted holes in the inner hub Rotate the cam to the desired position and retighten the three retaining bolts to 15 ft los If the head is milled then retarding the exhaust cam lobe timing must be carried out with extreme care You must have at least 060 between the piston and the valve e After the cam timing change is made reset your ignition timing and go out and try your acceleration test or perform dyno testing You must check your fuel calibration after each cam timing change in order to perform an accurate test The cam timing has a profound effect of the air fue
9. to diagrams on back page 1 2 AO The procedure to change the gears is identical to the timing belt replacement procedure outlined in the factory service manual Obtain a suitable box or container to hold the hardware that will be removed from the engine during this installation This will aid in the prevention of lost nuts and bolts Disconnect the negative battery terminal before starting these procedures Remove the Spark plugs from the vehicle to aid in the installation of the cam gears i4 1 Ne m wed 117 13 inib Removal of timing belt front covers a Raise the front of the vehicle and support it using properly rated jack stands It is important for safety reasons to use adequate supporting equipment to prevent injury or damage to the vehicle Remove the front right wheel From underneath vehicle remove inner debris shield from inside fender well Put a jack underneath the engine for support and remove the front amp driver side engine mount Remove all drive belts a c oil pump power steering and the alternator belts Remove the water pump pulley and crankshaft pulley Remove the front lower cover timing belt upper and lower timing belt cover assembly N AN AN AN AAN Aae Q gt o0ao0o ogo xr NO NS 6 Removing the timing belt a Ss Rotate the crankshaft so that the number 1 piston is at TDC on compression Verify that the camshaft is in proper timing for this position i The oil pump sprock
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