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Author Topic:   crank timing
wrenchturner10
Dirt Forum Racer

Total posts: 80
posted April 01, 2005 07:39 PM  
When I put the engine back together I managed to retard or advance the crank timing.(put it on a different key slot) I'm not shure whitch way yet cause I haven't had time to check. The throtle response is better than ever so I will probably keep it this way. What do I need to check other than valve clearance?

Eljojo
Dirt Forum Champ
Total posts: 968
posted April 02, 2005 05:34 AM  
If you put the cam gear on a different keyslot and didn't use the corresponding timing mark to align the camshaft, your motor will NOT run. You will replace several valves and maybe a piston or two. If it's running good then you didn't misalign anything.

wrenchturner10
Dirt Forum Racer

Total posts: 80
posted April 02, 2005 04:03 PM  
the crank gear has three slots that allows you to advance or retard the crank timing, one has a circle, one has a triangle, one has a square as a refferance point. they all line with the mark on the cam to get the cam timing correct but I don't know if it plays with the valve clearance and don't want to put a valve through a piston, been there, done that and it is an expensive venture to say the least.

tlkdlw
Dirt Full Roller

Total posts: 42
posted April 02, 2005 06:35 PM  
Degree the cam, that will tell were you are at

dan ferry
Dirt Maniac

Total posts: 183
posted April 02, 2005 07:50 PM  
the farther advanced you go the intake valve clearance will lessen and the farther you would retard it the exhaust clearence lessens.

Eljojo
Dirt Forum Champ
Total posts: 968
posted April 03, 2005 05:47 AM  
Ok I must have misunderstood...I see that you were careful to use the corresponding alignment mark for the keyslot you used, but don't know if you advanced or retarded the camshaft. Yeah? Why not, just to be on the safe side, run a little air pressure into one of the cylinders and pull the valve springs. With the air holding the valve up re-install the rocker and adjust the lash. Roll (by hand) the crank two turns and be sure of your valve to piston clearance! Good Luck and, once again, sorry for the misunderstanding.
Jon

wrenchturner10
Dirt Forum Racer

Total posts: 80
posted April 03, 2005 10:39 AM  
Checked everything out and it looks good,thanks for the input.

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