engine won't turn by hand

[Christien]

What's the process for troubleshooting this? The engine is on the floor in the garage, no tranny attached, so it's not a question of the tranny being locked in 2 gears at once.

I'm moving all the bits from my 72 2.4 over to a 67 2.0. The engine will turn CCW (just a little bit) no problem, but won't turn CW at all. It's not a question of compression - I know what that feels like. It's locked.

When torquing the flywheel bolts I didn't realize until it was too late that the engine turned CCW maybe 1/2 to 3/4 of a revolution. So it could be slipped chains, but in reading here I read that you should be able to feel and/or hear this, and that wasn't the case. Also, in that case the I should be able to turn it a bit in both directions, but again that's not the case. It'll turn fine CCW.

To confirm, I'm using a 19mm wrench on the crank pulley, not the 22 fan pulley.

I'll pull off the chain housing covers if necessary, but I'd rather eliminate other variables first.

Thanks.

[Flat6pac]

Your cylinder walls are probably dry. Get the engine on its side and add oil through the plug holes, flip it and do the other side..been ther done that.
Bruce

[Christien]

If that were the case, it wouldn't turn CCW would it?

[dfink]

Chain.......... Pull the covers and check

[FrinkFrog]

Spark plugs are out, right?

[boyt911sc]

Originally Posted by dfink

Chain.......... Pull the covers and check

+1 on chain! A damaged or detached chain guide could give you similar result.

Tony

[ClickClickBoom]

Check your flywheel bolts and pressure plate bolts, sounds like a too long bolt bottomed out.
eric

[SteveinTO]

Pull the chain covers & check cam timing. If something has come adrift you could have valve/piston interference or the chain hung up on a guide. As stated before, if it moves slightly backwards I doubt the pistons are frozen in the bores. Don't force it until you check.

[Christien]

Originally Posted by ClickClickBoom

Check your flywheel bolts and pressure plate bolts, sounds like a too long bolt bottomed out.
eric

Bingo. Some of you guys are too hasty to get in there and do the tough and dirty work before trying the simple stuff first!

I backed out the pressure all the pressure plate bolts and the engine turned normally. Then I tightened them one by one until I found the one that was too long and was catching on something inside. I compared it to the next bolt around and the difference was about 2 or 3 mm, tops. I ground it down, reinstalled and now all is good. I'm sure glad I didn't jump the gun and pull the chain covers!

[dfink]

Why might I ask is the bolt too long. Did you not use the correct bolts for the flywheel. Naughty... naughty....

[Christien]

Originally Posted by Christien

I'm moving all the bits from my 72 2.4 over to a 67 2.0.

915 being mated to an engine that originally had a 901. It was a pressure plate bolt, not a flywheel bolt, and yes it was the correct bolt for the 915 - it all came off my 2.4 engine, which was running and shifting fine. The perplexing thing is that it's only 1 bolt out of 9 that was too long. I did replace some of the PP bolts when I replaced the clutch last year, with the correct bolts. I don't remember for sure - I might have only replaced 1 but I thought I replaced a few. Oh well, all's well that ends well.

[Wayne 962]

Flywheel bolts are meant to only be used once...

-Wayne

[Christien]

I think we're maybe getting terminology mixed up here. There are 6 flywheel bolts that require a 12-point socket to attach the flywheel to the engine. They sit in a tight circle near the centre of the flywheel, with a diameter of maybe 4 or 5 cm. I replaced the flywheel bolts.. There are 9 pressure plate bolts that require a hex head socket (6mm? 8mm? can't remember) to attach the pressure plate to the flywheel. They sit in 3 groups of 3 around the circumference of the pressure plate. I re-used the pressure plate bolts.

[ClickClickBoom]

Originally Posted by Christien

Bingo. Some of you guys are too hasty to get in there and do the tough and dirty work before trying the simple stuff first!

I backed out the pressure all the pressure plate bolts and the engine turned normally. Then I tightened them one by one until I found the one that was too long and was catching on something inside. I compared it to the next bolt around and the difference was about 2 or 3 mm, tops. I ground it down, reinstalled and now all is good. I'm sure glad I didn't jump the gun and pull the chain covers!

Occams razor! You also said this occurred when you were tightening the flywheel, it sounded like a classic, bolt hitting reinforcing rib or casting. I always return to the last step performed when things go bad and work backwards. I am kind of a clod and always have to unfix my own work when I am in a hurry, I no longer hurry when doing critical work.
Hola, glad it was a simple fix.
eric