frozen engine

[sdsurf]

Ok I got my latest 521 and the L16 in it is frozen. I can't turn it over by hand with a socket on the crank. I pulled the valve cover and poured oil on it (thanks mark) and pulled the plugs and squirted marvel mystery oil on the pistons. It is in neutral. ANy suggestions?

[Pacific coast Datsun]

Mike this is a longshot but maybe the clutch disc is fused to the flywheel thus causing the crank to not turn. It shouldnt be that hard to turn the crank bolt.

[datsunfish]

I had a mysterious lock up once and when we put it in 4th gear and rocked it back and forth it let free.I had my tranny stuck in 4th gear earlier that day so we learned that due to the ratio in 4th you could actually push it in gear.

I have also had 2 occasions with warped heads to the point that the cam would not spin and locked up the motor.Had to drag it to get it to start once and the other time I was trying to pop start it and a cop pulled up and told me to get in and he pushed me until it started then drove off!Good cop!

So maybe try to rock it around in gear or check the valve lash otherwise you will have to disassemble some stuff.

ps.take out the spark plugs to release the compression.

[datzenmike]

Mike this is a longshot but maybe the clutch disc is fused to the flywheel thus causing the crank to not turn. It shouldnt be that hard to turn the crank bolt.

 

If it was fused wouldn't it just turn the input shaft if in neutral?

 

Stick a starter on it... a gear reduction starter if you have it. They are over a hp in power I think plus the mechanical advantage of being out on the starter ring.

[dat521gatherer]

try turning the engine the other way. could be a dropped valve head sitting on the piston.

[banzai510(hainz)]

thats what I was thinking maybe some body put the cam in wrong and turn motor till it got stuck and then got rid of it.

[sdsurf]

If I try to turn the engine the other way the Crankshaft pulley bolt just loosens. I will try the 4th gear rocking but I have serious doubts. I may just put the L20B I have together and try that one. Or should I pull the head first?

[moparvwfreak]

i would yank the head sn see whats g oing on first. if its really done for THEN swap the L20 in.

[hang_510]

to try to get it to move (like you were bump starting it) put it 2nd, roll it, release the clutch...that should loosen it, if that doesnt work,

your already prepared to pull it apart :blink:

[Bleach]

if the starter is installed, remove it.

I once had a tooth break off on the flywheel and jam the starter gear against it. It seemed like the engine was seized but it wasn't.

[sdsurf]

Got the frozen 1600 out today... Now the fun begins!!!

[ppeters914]

Got the frozen 1600 out today... Now the fun begins!!!

More fun if you provide pics! :w00t:

[Pacific coast Datsun]

Yeah Mike we need pics of the swap :D

[sdsurf]

just took it out, dark and raining....

[Pacific coast Datsun]

& your point?.....Jk! Lean on me for help if you need to.

[sdsurf]

engine bay

 

engine

 

 

Ok in the below pic there is a plastic tube insert circled. It appears to have broken off. What is this?

[datsunaholic]

That used to be a vent cap. They tend to get sheared off when the engine and tranny are pulled (it hit the trans tunnel on the way out)