AEM TruTime Adjustable Cam Gear 23801BK 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: 10-7031 Rev C 
. 
 
 
 
TRU-TIME 
ADJUSTABLE 
CAM GEAR 
Part Number: 
23-801BK & 23-802BK 
 
 
 
 
 
 
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...

 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
b)  Remove the nuts securing the ignition wire cover.  Remove the ignition wire cover.  
Remove the spark plug wires. 
B16, B18C & H22A 

 
 
 
 
c)  Remove the cap nuts, nuts and washers securing the valve cover to the cylinder head.  
Remove valve cover.  Remove the bolts securing the middle cover.  Remove the middle 
cover.  Remove the rubber plug to expose the belt tensioner adjustment bolt. 
B16, B18C & H22A  

 
 
 
 
 
B18B & H23A 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
B16 & B18C 

c) Align the motor to TDC.  Always rotate motor in a counter-clockwise motion.   
 
 
 
 
 
 
 
 
 
 
 
 
 
H22AB-Series 
H-Series  

 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 sure...

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)  Make sure the timing belt and camshaft pulley are engaged securely. 
vii)  Torque the adjusting bolt. 
f)  Rotate the crankshaft 6 complete revolutions and return it to the TDC mark on the crankshaft 
pulley. The TDC marks on the AEM cam gear should align with the diagrams above. Note: If...