AEM TruTime Adjustable Cam Gear 23831BK User Manual

ADVANCED ENGINE MANAGEMENT INC. 
2205 126th. St. Unit A 
Hawthorne, CA 90250 
Http://www.aempower.com
 
Instruction part # 10-7013 
© 2003 Advanced Engine Management, Inc. 
 
 
 
 
TRU-TIME 
CAM 
GEARS 
 
Mitsubishi Lancer Evolution 
Part number 23 – 831 series 
 
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...

 
 
You have just purchased the BEST adjustable cam sprockets available. These AEM 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...

 
 
Figure 1A and 1B 
Read and understand these instructions BEFORE attempting to install this 
product. See reference to diagrams on back page.
 
1.  The procedure to change the gears is identical to the timing belt replacement procedure 
outlined in the factory service manual.  
2.  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. 
3.  Disconnect the negative battery terminal...

 
 
Figure 2A 
Figure 2B 
ii)  The oil pump shaft and crankshaft 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. 
(b) Loosen the center bolts on both cam gears. 
i)  These bolts are installed at 68 ft-lbs of 
torque from the factory so do not rely 
solely on the tension of the timing belt to 
hold...

 
 
Figure 3A, 3B, and 3C  
(d) From the exhaust cam remove the bolt that is at the 10 o’clock position and from the 
intake cam remove the bolt from the 2 o’clock position. 
 
8. Installing timing belt 
(a) Install the timing belt on the intake cam. Make sure that the gear is at the proper 
position with the pin straight up and the alignment marks are horizontal. 
(b) Insert a tie wrap (supplied with kit) into the 
open bolt hole and tie wrap the belt to the 
gear. 
(c) The exhaust cam may be off from...

 
 
Figure 4 
(b) With the automatic tensioner in place, loosen the tension pulley-fixing bolt. 
(c) 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). 
(d) Measure the protrusion of the auto 
tensioner. It should be 4 ± 2mm, if not 
repeat the pulley adjustment procedures.  
(e) Once adjustments are...

 
 
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 do 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...