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Oil to top end C157

R

Randl Bye

New User
My 1971 2400A has a C157 gas motor that I just rebuilt with a new oil pump. It runs really well but I'm getting no oil to the rocker arms. i don't know how much oil should be there or why its not getting to the top. Great oil pressure to the gauge. any ideas what it might be? I cleaned up the oil pressure regulator it looks perfect.
 
Did you lign up the cam bearing holes to feed the drilling to the top end? (Not sure it has cam bearings, but I think it does). Jim
 
I am not sure if this engine is like a C263 where you have to have the correct tower(of the valve train supports)for the valve train to align the holes with the port in the block. Mine was off one and did not get oil to the head. Had to take the head bolts loose and move it to the correct one.
 
Good thought. If the bolts were put in the wrong holes,or the towers mixed, it could be blocked there as well.
 
Not sure if this engine is like the diesel in that series but the front of the rocker arm pivot assembly must be indexed properly I remember having to use a mirror to look and align 2 dots
one on the front tower and the one on the rocker pivot tube. Someone had put the motor together wrong and then ran it for maybe 10 hours with no oil at all to the top of that engine.
She had thrown off 3 pushrods. We replaced the entire rocker assembly with a used one and all new pushrods. That thing runs like a top now that's tough. Thinking it was a D239
 
(quoted from post at 20:18:21 07/30/18) Did you lign up the cam bearing holes to feed the drilling to the top end? (Not sure it has cam bearings, but I think it does). Jim
Click to expand...

Not sure what you mean When I rebuilt the engine i did not replace the am bearings. I'm thnking the problem is in the position of the rocker shaft?
 
The front headbolt that holds the tower is smaller than the hole in the head. oil is supposed to come up around the bolt. then into the rocker shaft.
 
The rocker shaft is aligned with a roll pin that I have never removed and doesn't look like it can be installed any other way
 
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