Re: 1937 115C mechanical refresh

Posted by Duncan Michael On 2019/11/30 18:19:31

The 1937 block has no oil ports on the left side or tapped holes on the cylinder head to mount a filter.

I attached a line to the front main galley on the right side of the block,and routed it up and behind the water pump, then along the head to the inlet side of a aftermarket filter housing. I drilled and tapped a hole in the block behind the generator and attached a tube to the discharge side of the filter housing.
The filter housing uses a .060" hole in the center tube as the restriction. I fabricated a bracket that mounts between the water outlet and the head to mount the filter housing.

I didn't like the idea of boring the original connecting rods to the later bearing od. This process will expose the rod bolt at the parting line. Instead I used Clevite #988P std. These fit various Nissan models from 1968-1989. Standard size Nissan rod journal is the same size as Packard .010" undersize. I set bearing clearance at .002 mains, and .0018 rods. Oil pressure is 40# hot using 5w-30 oil. It requires cutting the lug notches in the rod and cap, and drilling the pin oil hole and spit hole in the bearing.

I'll post pictures of the oil system.