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Baller on a Budget
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Discussion Starter #1
I have a friend that has a BBC and has always had at least 60psi of oil pressure. We went to fire it up yesterday and it was only reading 20psi. We tried letting it warm up and gave it a couple revs and got nothing better than 20psi. We already replaced the sending unit and the gauge works fine. Its just weird that it started this because we ran the piss out of it on tuesday and everything was fine. Any Ideas?
 

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Oil filter

Cut open the oil filter and peel back the accordion type filter media. Look for flakes, either copper or silver in color. That will probably tell a tale, but even if it doesn't I think you're looking at a teardown. I'd like to say it could be a stuck relief piston in the oil pump, but those usually stick closed, not open. ANY chance you toasted the oil in the previous outing? What does the oil look/ smell like?.........IF you have any doubts about the electric gauge, screw in a mechanical gauge to verify.....I wouldn't run it much though, you may hurt more parts..........Ray

PS: I'm assuming NOTHING was done to the engine since the last time out....
 

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Glendale Arizona
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2,368 Posts
I just went through this with mine.

Here's me Freaking out. out a couple weeks ago.



I'd suggest taking the oil filter off and cutting it open. Inspect the pleats real good. If no metal is found, try a mechanical gauge. I bought one at O Reilleys for $20 and it came with everything to hook it up..

Mine was either the guage or sender. Still not sure which.

I Had good oil pressure with the mechanical. Funny thing is, I put the original electric sender back in and the gauge started reading normal again.

Still can't quite figure that one out.

Since I know there was no metal in the filter and the mechanical gauge read right I got no
worries.

Damn it [email protected]!##%T$^%$&^ You're too fast for me.
 

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Have you tried a mechanical gauge yet?.

Follow the above recomendations first, if the filter has metal in it, you're pretty much pulling the motor anyways...........if it happened all of a sudden like that it is likely a problen with the pick up tube. could be stuck to the bottom of the pan or cracked...

Good luck, not a good thing to have happen in early summer :)st

GT :)hand
 

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Use a mechanical gauge to verify before any assumptions are made. I've seen more electric gauges crap out than I can remember. If the engine has been runny well for a couple of seasons without any problems, unlikely it would just all of a sudden lose 40psi on a seasoned motor. 95% of the time is it the gauge.
 

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Baller on a Budget
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168 Posts
Discussion Starter #6
Thanks guys for all of your responses. Me an him are pulling the motor tomorrow. We tried a mechanical gauge and it read the same as the electric. So he already ordered a new oil pump and pick up. There weren't really any metal shavings in the oil filter a couple of flakes but nothing that looked bad. This is the first year he has had this boat. Hes takin it out about 10 times already without any problems but who knows whats what on a used jet boat. Hopefully its an easy fix as the motor show no signs of anything being wrong.
 

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On my race car had a problem like this and changed from a Fram filter to
a Wix and bingo 70 psi again
sometimes with bypass blocked off it will kill the filter
check and see if the impeller has moved foward putting psi on the crank
this can cause the main thrust bearing to go
 

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Baller on a Budget
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168 Posts
Discussion Starter #8
So we pulled the motor the other day and got the pan off. Found out that the pickup tube was laying in the bottom of the pan. Somebody did a crappy weld to the pump and it broke off. It was a good thing we found before it did any damage to the motor.
 

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So we pulled the motor the other day and got the pan off. Found out that the pickup tube was laying in the bottom of the pan. Somebody did a crappy weld to the pump and it broke off. It was a good thing we found before it did any damage to the motor.

Sooo what'd I win?:D :)devil

GT :)hand
 
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