Cloyes 3-Keyway Crank Sprockets - Manual

February 2, 2009
© Copyright 2009, Cloyes Gear & Products, Inc. All rights reserved
Installation Instructions Cloyes
®
3-Keyway Crank Sprockets
The Cloyes
®
Patented 3-Keyway crank sprocket allows adjustment of the crankshaft timing by
± 4°.
Remember: The camshaft angle is half of the crankshaft angle, therefore the camshaft will
correspondingly advance or retard by
± 2°. By changing the cam timing, enhancements to the
camshaft characteristics can be achieved. For example, retarding the cam timing will increase high RPM
horsepower, and advancing the cam timing will increase low-end torque. The following examples
illustrate which timing mark is used with its corresponding keyway:
GM and Chrysler Ford Retard keyway
To retard the camshaft timing, use the  timing mark on the crank sprocket and the retard keyway shown above.
GM and Chrysler Ford Factory keyway
For factory specified timing, use the
Ο timing mark on the crank sprocket and the factory keyway shown above.
GM and Chrysler Ford Advance keyway
To advance the camshaft timing, use the
∆
timing mark on the crank sprocket and the advance keyway shown above.
Notes:
After determining which setting to use, we advise marking (with white marker or similar) the
corresponding timing mark and keyway. This will make them easier to identify during installation.
Some high performance camshafts are ground with advance or retard built in. In this case the cam
manufacturer intends the cam to be set at the factory specified timing.
Also, during and after installation, observe for any interference between the timing set and engine block.
If interference is found, remove or grind that area of the block so adequate clearance is obtained. When
removing a press fit crank sprocket, a proper pulling tool should be used.