Crankshaft not turning clockwise

[michaeljchn]

And then do a compression and/ or leak down check to see if the valves are bent

You know, i thought about that.

But im gonna have to believe that i simply could not have generated enough upward force to bend the valve.

[sapote]

No way he bent the valves by turning the engine by hand

We all hope so. But at its near highest position with the crank arm almost parallel with the cylinders, it generates the maximum upward force for a minimum rotational torque by hand.

[digger]

No way he bent the valves by turning the engine by hand

you certainly can you be surprised how easy it is to make the valves a bit leaky they won't be all smashed up, only takes a smidge of a permanent set that isn't even visible to the eye like a good VJ vs crap one its small differences. The OP will know how hard he tried once it contacted given he didn't have awareness of there being a possible contact it may not have been going as slow as one might expect. My guess is he is fine but for all of 15min to do a compression check that's what id do as plugs are already out.

[tcp]

Quick update - i ran back out to my car and just turned the crank CCW (i know its the wrong way, hopefully it didnt mess anything up) and got the crank to TDC. Locked it with the pin, tightened down the hubs, and rotated it back clockwise and now it spins freely.

I ran into the exact same problem when I did my VANOS rebuild. And just like you, I rotated the crank CCW, retimed the engine, and reinstalled the hubs. After than, it rotated freely and was timed correctly. Now, several thousand miles later, I haven't had any problems whatsoever. Unless you tried to force the crank when you hit resistance, I'd guess your engine is going to be fine.

[Anri]

No way he bent the valves by turning the engine by hand

Maupineda,


Yes way ! It depends how hard it was turned to lock.
I have seen it with my eyes how a friend bent valves on his S38 when
he was setting the timing. S38 valves are 7mm all the way they are strong as a
braker bar....and he managed to bend them.

S54 stem has hi flow area at the lower part at 4.98mm and they bend very easy,
the 6mm is supported inside the valve guide and they don't bend there. The bend
occurs at the hi flow area under the guide 4.98mm

like digger said compression check and leak down to confirm good sleep.

Regards,
Anri.

[maupineda]

I speak off experience, I am not proud as is a pretty stupid mistake, which a friend and I unfortunately did, car was perfectly fine, if the OP did not have the plugs then there was no compression resistance, so unless you pull to dead and spin in the other direction and keep coming back at it like there is no tomorrow I don’t see it happening

[sapote]

I speak off experience, I am not proud as is a pretty stupid mistake, which a friend and I unfortunately did, car was perfectly fine,

It depends on where is the piston when it hits the valve. If the valve is fully opened then the piston hit it ways before TDC (less force); if the piston hits the valve when piston at its highest position then it is a much stronger force. The force to move the piston depends on the crank angle:
Piston force = crank pulley turning force * ( A + Cosine (crank angle); where crank angle is zero at TDC and 90 deg when crank at midway between TDC and BDT, and A is a constant.
Cossine(0) = maximum
Cosine (90 deg) = minimum.

So your case maybe different than his case, depending on the position of the cam lobe.