AUTOTECH 10.109.401K User manual

A U T O T E C H
Installation Instructions
Phone [phone] Fax [phone]-E Paseo Adelanto, San Juan Capistrano, CA 92675
Part Number: 10.109.401K
Description: ADJUSTABLE CAM SPROCKET, A1/A2/A3 8-valve
Notes:
Advancing the sprocket will increase low end (low RPM) performance,
while retarding the sprocket will help the top end performance. This is
also good when reinstalling a resurfaced head, because the timing will
automatically be retarded when installing a head with the cam closer
to the crankshaft. This sprocket will allow you to adjust for the peak
performance and power range desired.
Procedure:
1. Tighten the five flange head screws on the sprocket with a 5/16" 12-pt. socket to a
torque value of 90 in. lbs. Do not use locktite!
2. Remove the upper timing belt cover to gain access to your stock sprocket.
3. With the ignition key out of the car, and the car in neutral, take a wrench and turn the
stock timing belt sprocket to the zero position lining up with the marks on either the
cam cover or cylinder head as found in the instructions for finding Top Dead Center in
your Volkswagen repair manual.
4. With the large wrench, remove the center bolt on the sprocket and carefully slide the
sprocket off the camshaft end without moving the timing belt.
5. Install the adjustable cam sprocket with the TDC locating mark in the same position
as the stock one was when you removed it. Install the bolt torquing it to factory specs
(58ft./lbs.) Use Loctite on this bolt!
6. Loosen the five flange head screws in the slotted holes so that the plate can slide, then
relocate it to the position of your choice. With a large wrench on the center bolt that
holds the sprocket on, move the plate so the mark you are selecting is in alignment with
the mark on the outer “Black” gear.
Locating the timing mark on the black part of the sprocket from “0” clockwise or to the
“R” side of the sprocket “retards” the camshaft in single degree increments up to 10 de-
grees. Moving in the opposite direction “advances” the camshaft timing.
CAUTION: Certain camshaft and engine combinations result in an "interference" engine,
where excessive cam timing changes will result in engine damage. Be sure to rotate the
engine over by hand to ensure valve-to-piston clearance BEFORE attempting to start any
engine after adjusting cam timing.
7. Retighten all five outer screws (90 in lbs) and test your car. It is a good idea to leave the
upper timing belt cover off temporarily, while you test changes on the cam timing to suit
your driving needs.
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