Re: Oil Line Restrictor?

Posted by Owen_Dyneto On 2010/11/16 12:31:53

I only had occasion to shim 1 356 pump relief valve and it was too long ago to remember the particulars, but I'd think something considerably less than you're thinking. It's a short, stiff spring, maybe something in the order of 0.015" to 0.020" for a start? It's so easy to get at that a little trial and error wouldn't be much work.

Something else to think about - if the pump cover plate has ever been removed and the gasket replaced, the thicker the gasket the greater the pressure loss across the end of the gears - the original gasket was VERY thin - when I did the last one I used a piece of supermarket shopping bag craft paper, shellaced. If you do take the cover plate off, check for gear wear patterns on the cover; these also act as a path for lost pressure and if so, the plate can be surfaced back to smooth.