AEM TruTime Adjustable Cam Gear 23800BK User Manual

  
©2011 Advanced Engine Management, Inc. 
AEM Performance Electronics 
2205 W. 126
th Street, Unit A, Hawthorne, CA 90250 
Phone: (310) 484-2322 Fax: (310) 484-0152 
http://www.aemelectronics.com
 
Instruction Part Number: 10-7030 Rev C 
 
 
 
TRU-TIME 
ADJUSTABLE 
CAM GEAR 
Part Number: 
23-800BK & 23-804BK 
 
 
 
 
 
 
Legal in California only for racing vehicles which may never be used upon a 
public highway. 
 
 
 
WARNING:
,! 
This installation is not for the mechanically challenged! If you 
are...

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

Getting started 
a)  The procedure to change the gears is similar to the timing belt replacement procedure outlined in 
the factory service manual. 
i)  Note:  This would be an appropriate time to replace the timing belt if replacement is 
due or is close to the replacement interval. 
b)  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. 
c)  Disconnect the negative battery...

c) Align the motor to TDC.  Always rotate motor in a counter-clockwise motion.   
 
 
 
  
b) Remove the bolts securing the upper cover.  Remove the upper cover.  
Remove the rubber plug to expose the belt tensioner adjustment bolt.  

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3)  Installation of the AEM Cam Gear. 
a) Inspect the AEM Tru-Time Adjustable Cam Gear: 
i)  The laser etched timing marks on inner hub and the outer gear should be clear and easy to 
read. 
ii)  Loosen the cam gear bolts on the AEM cam gear and rotate the hub clockwise and counter 
clockwise. It should move freely without any binding.  Set the timing mark to 0° and tighten 
the five cam gear bolts to 15 lb. ft. 
iii) Compare the AEM cam gear to the O.E. cam gear. Make...

i)  The tensioner is spring-loaded to apply proper tension to the belt automatically after making 
the following adjustment. 
ii)  Always rotate the crankshaft counterclockwise when viewed from the pulley side.  Rotating it 
clockwise may result in improper adjustment of the belt tension. 
iii)  Set the engine to TDC. 
iv)  Loosen the adjusting bolt 180°. 
v)  Rotate the crankshaft counterclockwise so that the timing belt moves 3-teeth on the camshaft 
pulley to create tension on the timing belt. 
vi)...

12 Month Limited Warranty 
 
Advanced Engine Management, Inc. warrants to the consumer that all AEM High Performance 
products will be free from defects in material and workmanship for a period of twelve (12) 
months from date of the original purchase. Products that fail within this 12 month warranty 
period will be repaired or replaced at AEM’s option, when determined by AEM that the product 
failed due to defects in material or workmanship. 
 
This warranty is limited to the repair or replacement of...