loose timing chain?

[spikebot 81]

I did a compression check the other day and I noticed while rolling the crank it seems the dist rotor didnt move right away. By turning the crankshaft with a rachet one direction then the other I'm seeing 6 or 7 deg on the timeing marks before the rotor moves. Too much slack in the chain? What do you guys think?

 

[minifridge1138]

A streched timing chain is possible.

But don't forget that the crank rotates 2 times for each revolution of the cam. So the distributor will look like it is not moving very much compared to how much you rotate the crank.

Are you having problems with the car?

 

[spikebot 81]

Minifridge, No problems. A slight miss at idle that I cant seem to get rid of. I was just curious about what was acceptable.

 

[JohnZ]

If you see more than 3-4 degrees at the crank with no rotor movement, I'd suspect a worn timing chain.

 

[spikebot 81]

If you see more than 3-4 degrees at the crank with no rotor movement, I'd suspect a worn timing chain.

Thanks JohnZ, The engine in this car is kind of a mystery motor. I've owned the car 1 year. PO supplyed reciepts showing rebuild engine installed 12,000 ago. C 10 truck motor. I havent confirm any internal components yet. But 3 or 4 degrees sounds alot better than 6 or 7.