VW oil pump and pressure

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Pops

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Jan 1, 2013
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8,061
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USA.
I have checked several VW oil pumps and all of them had .0015 clearance between the end of the gears and a straight edge on the front of the pump body. The stock VW oil pump cover gasket is .004, for a total of .0055 clearance between the end of the gears and the cover plate.
On my 1835 VW engine, I made a new gasket from .002 gasket material for a total of .0035 clearance between the end of the gears and the cover plate that raised my hot oil pressure 8-10 lbs. I also used an adjustable cover for the high oil pressure regulator that is on the lower right side in front of the flywheel end of the case. I adjusted for a max of 55 lbs of oil pressure and the excess is diverted to the oil sump. My cruise hot oil pressure is 42 lbs with a max of 55 lbs on a cold oil start-up. Be sure you check your oil pump cover plate for flatness, I bought a oil cover plate with the oil outlet to go to an oil cooler and the cover had all four corners .020 high, Junk.

Dan
 

delta

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May 26, 2011
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2,142
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Brookside Utah
I haven't seen the adjustable covers and it's nice to know they're out there. I like 20/50 Valvoline synthetic. Are you using straight weight? I've sanded a bunch of pump plates to get the scratches out using sandpaper on glass. Nice installation you have.
 

Pops

Well-Known Member
Log Member
Joined
Jan 1, 2013
Messages
8,061
Location
USA.
I haven't seen the adjustable covers and it's nice to know they're out there. I like 20/50 Valvoline synthetic. Are you using straight weight? I've sanded a bunch of pump plates to get the scratches out using sandpaper on glass. Nice installation you have.
I use straight 30 weight oil . If you would look at the owners manuals for the VW bug for the year that you are using, you will see that VW does recommend a straight weight oil and says to not use the multi weight oils, plus the engine will want to leak oil easier with the multi weight oil.
I also sanded all the machine marks out of my cover with fine sandpaper on a sheet of glass.

What VW powered aircraft are you flying? Dan

Added-- GP's or any VW hotrod shop sells the adjustable cover, spring and piston.
 
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