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crusader1

  • Karma: +2/-0
Pressure relief
« on: June 30, 2016, 11:47:06 AM »
I'm another newbie to the jet boat scene. Had stern drives for years and always wanted to give a jet a whirl! That Being said I just got an 85 crusader 20' with a BBC and Berkeley pump. Had it out a couple times runs great! Noticed one of the logs leaking on the flange back by the snail and some bubbling on the intake. This was just while running on the water main at my house! We have a lot of pressure but can't imagine them leaking at even 75psi?? So I reseated the intake. Haven't done the exhaust yet. But I did some research and ran across a video explaining the prv valve. My boat didn't have one?? So I bought one from cp performance and installed a ball valve to regulate the flow. But have since read a thread on here saying I don't need either??? Can someone with legit experience tell me what the best course of action on these things is going to be?? Thanks in advance
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  • Karma: +29/-0
Re: Pressure relief
« Reply #1 on: June 30, 2016, 03:29:33 PM »
75 psi is 55 to 60 psi too much. I'm surprised you didn't push out the head gaskets, too.

The system is designed for 20 lbs or so. Think radiator cap. They are rated at or up to 20 psi.

Snail gaskets do rot out, eventually. This is normal. 75 psi could push them out.

A gate valve is infinitely more adjustable than a ball valve. I shoot for 140-150* at idle. and 125-130* at cruise.

Berkeley used to have a fitting in the pump to restrict the flow. Yours may or may not have one. Gate valve is better, IMHO.

Pressure regulators complicate a simple setup, and are not as reliable, again, opinion.

Save your money for gas  :thumbup:

Dan'l
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crusader1

  • Karma: +2/-0
Re: Pressure relief
« Reply #2 on: June 30, 2016, 03:46:57 PM »
I agree that's way to much pressure! That's just what it is at the hose spigot. I figure though running unrestricted through the engine the gaskets shouldn't ever see that pressure. But I have no idea what is coming out of a pump at 4,000 rpm?? From what I can tell it hasn't blown any other gaskets. Like I said the boat had no regulator or pressure relief when I got it?? And no idea how long it had run that way??. So you think the prv is unnecessary? Just run a valve? From what I can tell I'm running about 120' at idle. But the gauge doesn't even move till 100' so it always looks cool. I just installed the ball valve because I hate gate valves they always seem to stick after a while. But I've also never used them in a boat. Just on home plumbing! LOL. As for the riser gaskets. They are stuck like glue!! I figured soak them in WD and use a mallet to separate them?? What you think?



Sent from my iPhone using SoCal Jet Boats
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  • Karma: +29/-0
Re: Pressure relief
« Reply #3 on: June 30, 2016, 04:41:00 PM »
A gate valve over ball because once its adjusted, you can tighten the packing nut (underneath handle)

As for gasket removal, I'd use diesel fuel for that.

As far as pressure at 4K rpm, put a gauge on it and see, everything else is just a guess.

This can happen when a PRV malfunctions:
http://www.socaljetboats.com/engine-mechanical-electrical/overheated/

Dan'l
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