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Old 06-26-2007, 08:01 PM
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russfortin russfortin is offline
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Boat: 1987 mastercraft prostar 190 ford 351 / 2002 Prostar 197TT
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oil pressure

I'm posting like crazy now, love this site!

I have one other problem in my 87 prostar. When i initially start the engine i get an oil pressure around 60 or so and over the next five minutes it eventually goes down to about zero and stays there. Everytime i shut the engine down and restart throughout the day, it'll be back up at 60 or so for a few more minutes. Theres no engine knocking or anything to make me believe that the guage is correct and there is no oil pressure. And, it might not be good, but i've run it almost everyday for a year now with this problem.

any pointers on what to check, maybe something in clogged??
Thanks

Russ
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Old 06-26-2007, 08:13 PM
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Since the gauge is probably an electric, you could check the sender...heck, might as well just replace it and see if that works. If you put a new sender on and you still get Zero, then you should hope that it's a bad gauge...
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Old 06-26-2007, 08:34 PM
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where is the sender located? what does it look like? should be no problem to replace it, just not sure where, thanks
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Old 06-26-2007, 08:57 PM
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Attached to this thing somewhere...





Sorry...Sorry...I couldn't resist

I'm not exactly sure. It may look something like this with one wire attached to the top...


Skidim has them for 30 bux...

http://www.skidim.com/prodinfo.asp?number=R020001
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Old 06-27-2007, 10:23 AM
85S&S_Keuka 85S&S_Keuka is offline
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Quote:
Originally Posted by M-Funf

I'm not exactly sure. It may look something like this with one wire attached to the top...

Yep, that's what it looks like. It's on the port side of the engine (assume you have a 351), above the oil filter. Mine was good enough to show somthing on the gauge if the pressure was above 50psi, but once it warmed up enough to drop below that, it would read 0.
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Old 06-27-2007, 10:56 AM
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Agreed with the picture above. Just fyi...Since mine is original, it's painted black along with the rest of the engine/components.
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Old 06-27-2007, 12:08 PM
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I had bouncing oil pressure last year causing my low oil alarm to chirp when it bounced below 10. I replaced the sending unit and problem went away. Be forewarned however, the 1/4" nipplle that screws into the block will probably break off. Mine did and I've read others post that theirs did too. Don't do this without a hardware store nearby to resupply the 1/4" fittings that get mangled in the process. Good luck.
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Old 06-27-2007, 07:07 PM
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I agree with all the posts so far, replace the sending unit. If the problem still exists I'd recommend attaching a "wet" oil gauge to check psi. The gauge will screw in right where the sending unit would be. A good gauge won't lie. Also, psi will be higher when the engine is cold - once at operating temp psi will drop.
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Old 06-27-2007, 07:15 PM
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Quote:
Originally Posted by MIMC
I'd recommend attaching a "wet" oil gauge to check psi. The gauge will screw in right where the sending unit would be.
Another idea would be to install a "tee" at the block so you could attach the sender and a remote "wet" pressure gauge. That way, you can compare the dash gauge with the "wet" gauge.
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Old 06-28-2007, 02:50 PM
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Quote:
Originally Posted by 85S&S_Keuka
Yep, that's what it looks like. It's on the port side of the engine (assume you have a 351), above the oil filter. Mine was good enough to show somthing on the gauge if the pressure was above 50psi, but once it warmed up enough to drop below that, it would read 0.
My 85 SS did the same, I replaced the transducer and the gauge works normal.
Dan
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