[JPDD]

While I was adjusting my valves this weekend I’m pretty sure I messed up the timing by moving the crankshaft while the chain tensioner was out of the rear cylinder :nono:.
I had just replaced the shims on the rear cylinder, returned the cams to their position at ATDC and bolted down the journal holders. While I was waiting for the gasket remover to do its job on the rear tensioner I wanted to check the clearances on the rear at TDC so I started to move the crank like an inch or two and realized the freakin’ chain and cams were not moving. I realized what I had done and was going to just go back (clockwise) that inch but I didn’t want to start compounding the problem. So, what would you guys recommend I do?

The only thing I can think of is:

Take the cams off the rear cylinder again.

Bring the front cylinder to TDC while allowing the rear cam chain to freely loop around and then another 360 degrees turn to bring the timing back to ATDC on the rear cylinder.

This method should work right?

 

[Thermass]

If you have a manual it should tell you where the the marks on the cam sprockets should be lined up while the engine is at TDC.

If you don't have the manual I would just turn the motor back where I started from making sure the cam chain is not moving with it. as long as you know where you started from.

once you get it back together spin the motor by hand with the spark plugs out and if you get any resistance, stop. This will be the safest way to tell if you get it back together right, or if you are having piston to valve clearance problems. Even if you don't have valve piston interference it still may not be together right.

 

[JPDD]

If you have a manual it should tell you where the the marks on the cam sprockets should be lined up while the engine is at TDC.

If you don't have the manual I would just turn the motor back where I started from making sure the cam chain is not moving with it. as long as you know where you started from.

once you get it back together spin the motor by hand with the spark plugs out and if you get any resistance, stop. This will be the safest way to tell if you get it back together right, or if you are having piston to valve clearance problems. Even if you don't have valve piston interference it still may not be together right.

Thanks for the response.
I do have the manual and I'm familiar with all the timing marks. I think the safe thing to do at this point is bring the front cylinder back to TDC on the compression stroke and then reset the rear per the manual's instructions. Since both intake and exhaust valves in the rear cylinder are retracted into their seats I don't think I'll damage anything when I move the crank without the cams in place.

 

[Thermass]

you sound like you have it under control. Good luck.

 

[JPDD]

you sound like you have it under control. Good luck.

Thanks!