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Old 10-01-2010, 02:18 PM
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How to verify crank and cam markings?

I am almost ready to install new cam and want to make sure I line cam and crank correctly. The cam sprocket has typical divot mark but crank has what appears like a triangle mark? I've never seen that before is that the correct mark to place head to head?

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Old 10-01-2010, 02:30 PM
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Quote:
Originally Posted by truckboy61
I am almost ready to install new cam and want to make sure I line cam and crank correctly. The cam sprocket has typical divot mark but crank has what appears like a triangle mark? I've never seen that before is that the correct mark to place head to head?
Look closely at the crank sprocket. It may have a "0", a square and a triangle.

copied from NorthernAutoParts.com
"Standard Timing Location:
This is the same as original O.E.M. setting. Use keyway and crankshaft gear tooth marked O.

4 Degree Advance:
Use keyway and crankshaft tooth marked with a Triangle. Note: The Triangle or advanced position should not be used without degreeing the camshaft. Many camshafts have the proper advance built in. Advancing the cam will reduce intake valve to piston clearance and increase exhaust piston to valve clearance.

4 Degree Retard:
Use keyway and crankshaft gear tooth marked with a Square. Note: The Square or retarded position should not be used without degreeing the camshaft. Many cams have the proper advance built in. Retarding the cam will reduce exhaust valve to piston clearance and increase intake piston to valve clearance."

So, installing the cam "straight up" will be accomplished by using the 0 on the crank sprocket, then lining up the dot on the cam sprocket at 6:00 O'Clock and the 0 on the crank sprocket at 12:00 O'Clock.

Now, once you get it assembled like this, do not be confused about the ignition timing. With the cam sprocket at 6 and the crank sprocket at 12, #6 piston is firing. You have to rotate the crankshaft one full turn after you get the sprockets and chain installed to get #1 piston at firing position in order to set up the ignition timing and run the wires.

Last edited by techinspector1; 10-01-2010 at 02:37 PM.
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Old 10-01-2010, 03:45 PM
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If it has no other mark than the triangle, then that is the straight-up alignment mark for dot-to-dot with the cam gear.
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