Re: Ken's 1937 115C Touring Sedan

Posted by Owen_Dyneto On 2011/4/16 14:13:54

I'm not sure how easy ring gears are to find, but it's not a high-volume service part. They certainly are around, contact the usual Packard vendors. As to fit, they are usually broken off with a chisel, and the new one heated hot and then shrunk onto the flywheel. Not a bad job, but you'll need a good torch or high temperature oven. Or farm it out to an auto machine shop - it'll be a pretty routine operation for them.

Original factory spec for compression on a 1937 120 was 110 psi with the 6.6 CR head, 118 with the 7:1 head. Doing the test with the throttle valve closed would certainly limit the pressure you obtained so the results are better than you posted. In any case I wouldn't worry at all about the values you're getting, more than adequate for a good-running engine, and they may rise a bit as the engine sees some accumulated mileage.

If your fuel pump inlet suction hose is not a recent replacement, it may well suffer the same fate as the pump diaphragm. Niagra Packards sells them with proper materials of construction.