ctuck0659

Can someone tell me which Oil Pressure Bypass Valve is the correct one to use with a remote filter/ cooler setup? My understanding was that 25161284 is the 30 pound valve that should be used with the remote set-up and 25013759 is the standard 15 lb valve used when the filter is in the stock location on the block. However in the Teague article: https://www.offshoreonly.com/article...tech-revisited he's recommending the 25013759. I'm referring to the valve on the block filter pad, not the one in the return tube.

T-Mone

plug it eliminate it totally

SB

iTrader: (1)

^^^Yup. ^^^

If installing one though, Teague made a misprint or wrote this before it was known about the higher psi valve.

This is straight from GM:

SB

iTrader: (1)

BTW: The following thread on OSO became the 502 Oil Bible thread of basically the wholeinternet.

http://www.offshoreonly.com/forums/g...-hardware.html

ctuck0659

I read it and I agree, great information. Matter of fact I just ordered 12 AN lines and fittings to replace the 1/2" lines and 3/16 flair fittings on my 540's. I have less than optimum pressure after the oil heats up and the cooler thermostat opens so I'm hoping this cures it. What I don't completely understand though is if the 12 lb bypass valves are opening why is the pressure still lower? Is it because the filter/ cooler circuit is still "draining off" pressure even though the bypass valve is opening? I don't want to pull the engines to plug the bypass opening so I'm praying I can get the old valve out and the 30 lb one in with the limited access I have. Not looking forward to it....

SB

iTrader: (1)

When that bypass filter opens, the oil is not going to the oil cooler which means it's no going to the filter either. Double whammy.

ctuck0659

Not necessarily. I have no doubt that the bypass is opening but it's not carrying all the oil- my thermostat is plumbed into my remote filter mount and the temperature still moves up and down when running and the lines & filter still get hot. Some oil is pumping through that circuit while I have no doubt some is being bypassed, which leads to my question about whether that would cause lower pressure.

Panther

plug it and forget it!

ctuck0659

I'd love to. Do you happen to know of a dwarf small enough to walk under my engines and hammer a plug in?? If not, I'll go ahead and try to change it out for a 30lb valve as I mentioned above.