Shimming The Oil Pump

[harun]

Can anyone tell me were to actually place the shim in the oil pump.I have read the wiki but still cannot get my head around were to put the shim.

Pictures would help alot.

 

Cheers

[Croc]

Have you checked out FAQ. Doesn't sound to hard.

http://www.rollaclub.com/faq/index.php?title=Oil_Pump

[SLO-030]

ok, when you pull the spring out of the oil pump there should be a little cup where the spring locates.

find something like a washer that sits in the spring cup, about 3mm as suggested by the faq.

 

the idea of this it closing the distance between each end of the spring, when you do this it puts the spring under more compression and raising the pressure applied to the oil pump bypass. l the more force keeping the bypasss shut mean more oil pressure to open it and BAM, theres your higher oil pressure.

 

u may or may not kno this but i put the info up for the others that may not kno.

 

CHEERS

Ryan

[Smithius]

Sorry to bring up an old post but I'm doing this now and i wondered if it matters what end you put the shim on the spring.

 

If you put it the end of the spring where the split pin is nothing will retain the spring but the walls of the pump body. If you put it the other end the spring will still be retained by 15mm or so in the relife valve plunger?

 

I have included a crappy drawing to illistrate what i mean

[philbey]

Functionally, no difference between the two, it just changes the preload on the spring.

 

BUT - Put it on the end with the spring clip, so the spacer itself is stationary.

[camerondownunder88]

Hi,

Old ish thread not but had to post this bit of info.

 

Started my rebuilt 5K other day with my oil pressure gauge connected for the first time.

 

I runa 2mm shim and hold 80PSI at idle with cold oil. I run a 10W-40W oil in it. After it warmed it dropped to about 70PSI that was when I shut it off.

 

I feel this would be enough. 3mm might be to high but if your keen go 2.5mm should be a nice shim size also.

 

Cheers

Cameron

[philbey]

Cam, what was the original oil pressure, that way we can work out the spring rate and then have a nice little chart in the wiki so people can set it for their own desired pressure!

 

TP.