tartop Posted January 10, 2017 Share Posted January 10, 2017 I am having the engine rebuilt in my 1929 Pontiac by the local machine shop. Everything has went pretty smoothly except they have an oil leak they are not for sure on how to fix. They have the engine running and probably have about 2 hours run time on it so far. There is an oil leak between the rear of the crank and the block. There originally is no gasket there. They say it is made to drain the oil from that area back down into the pan. We assume they always have leaked some because of the design but they are not comfortable letting it leave because of the size of the leak. Concerns with getting oil on the clutch etc. Does anyone have any suggestions on a fix?? Thank You for your help! Link to comment Share on other sites More sharing options...
Kornkurt Posted January 11, 2017 Share Posted January 11, 2017 There are wooden wedges in the crankshaft bearing cap. Do they have them in place ? Link to comment Share on other sites More sharing options...
tartop Posted January 11, 2017 Author Share Posted January 11, 2017 Kornkurt---I would guess that they do not. Do you have any more information on this or pictures so I can show them?? Link to comment Share on other sites More sharing options...
Guest Posted January 11, 2017 Share Posted January 11, 2017 (edited) Did they insert the proper wooden seals on each side of the rear main cap? If the rear main clearance is correct and the wood seals are in place the groove at the rear of the engine should carry the oil down to the drain hole and into the crankcase. By the way EGGE has the wooden seals. Are they running the engine on a stand? If so that may be their problem because there is no suction through the crankcase and it builds up pressure. When driving on the road the road draft tube alleviates this situation. At an idle the air from the fan blowing into the oil filler tube is sufficient.. Did they use new pistons with all the rings above the wrist pin or reuse the originals with one ring at the bottom of the piston. If so maybe they didn't notice that the bottom ring comes half out of the cylinder at the bottom of the stroke. If a three piece oil ring is used here (rather than the original type) the first time the engine turns over you break the bottoms off all the pistons. Edited January 11, 2017 by Guest (see edit history) Link to comment Share on other sites More sharing options...
Kornkurt Posted January 11, 2017 Share Posted January 11, 2017 My parts book shows 2 wooden wedge blocks in both the front and rear main bearings. I do have some of these blocks NOS @ $4 each. Call me if you want to order them. Kurt 641-648-9086 Thanks Link to comment Share on other sites More sharing options...
tartop Posted January 26, 2017 Author Share Posted January 26, 2017 Well the machine shop installed the wooden seals and it did not stop the leak. Of course I know it is next to impossible to diagnose an engine leak when you cannot see the engine but does anyone have any other ideas?? Link to comment Share on other sites More sharing options...
DITCHBURN 1928 Pontiac Posted March 13, 2022 Share Posted March 13, 2022 I know that the oil pan lip at the rear of the block face sometimes gets slightly bent out of shape and the manual states that the lip needs to be flat and straight. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now