Offshoreonly.com - Low oil pressure after landing hard

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- - Low oil pressure after landing hard (https://www.offshoreonly.com/forums/general-q/350248-low-oil-pressure-after-landing-hard.html)

fordf350

10-10-2017 07:49 PM

Quote:

Originally Posted by Griff (Post 4587249)

Did you check oil temps????

I'm thinking the oil bypass valve may have got jarred in the hard landing and oil is bypassing the cooler

Oil temp came up a little bit. But Im thinking it was because of the lack of oil flow and pressure. 20-25 degrees above normal. Thanks Griff

fordf350

10-10-2017 07:54 PM

Quote:

Originally Posted by getrdunn (Post 4587284)

I like your riding style. Thumbs up. :party-smiley-048: btw you got some good advice already but before digging to deep throw a mechanical gauge on it even if you just tape it temporarily to top of back seat or where ever.

Thanks getrdunn: I thought I mentioned that at the very end. I ran the boat up to 4500 RPMs with a mechanical gauge and it read 2 PSI higher than the electric version.

fordf350

10-10-2017 07:58 PM

Quote:

Originally Posted by MESABALANCING (Post 4587297)

One of the most common bad problems to have is a broken main cap were the bearing starts to turn and you'll loose press. I hope thats not it but it is very common. Cut the oil filter and check for debris . Good luck

Thanks MESABALANCING. I cut the filter (M1-302) open after doing the oil change the next day after the hard hit and it was clean as an oil filter could be.

fordf350

10-10-2017 08:07 PM

Quote:

Originally Posted by dereknkathy (Post 4587298)

Bearings all look good? Oil pump, pickup tube and every bypass valve. What you mebbe shoulda done before pulling engine is bypass the oil cooler.

Thanks dereknkathy: I could not drop the pan on my set-up with out pulling the motor first. It took 5 minutes to get the pan off after I got the pan off because of the baffles in the pan. No metal anywhere.

dereknkathy

10-11-2017 02:07 AM

I wasn't saying drop pan in place. I was saying bypass oil cooler with a hose and run it to see if oil cooler could be problemo. When you get it back together, if same issue, do that next.

SB	10-11-2017 06:03 AM

All good suggestions. I'd add also look at oil pump mounting and see if that's cracked. Also look at any trays in oil pan,,,,oil cooler and filter lines.....bearings including main thrust,,,,etc,etc

Slight sidetrack but still on your engines and oil psi:

Before this incident happened...Anyone comfortable with 38psi at 3800 rpm ? Yeh, I know,,,,,rules of oil psi vs rpm this is just barely okay....but anyone else run this low ? IDK, maybe just me.

sutphen 30

10-11-2017 07:06 AM

I'd be pulling the engines and looking at the bearings,,these engines should have 50-60psi of oil pressure.something is wrong.

TxHawk

10-11-2017 08:27 AM

Have you tried landing hard on the port side? :wizard:

This is a tough one. I always tend to watch things closer after an incident, but it sounds like this might have been coming with only 38psi cruising and its a coincidence that it showed how far it would go after the hard landing. Good luck!

dereknkathy

10-11-2017 08:50 AM

As TX sez, I can't really see anything except maybe the oil cooler or a line being hurt enough to cause oil pressure drop. And even that is a reach. I don't know the oil system that well. Is psi read before or after cooler? If after, you may have had a restriction in the oil cooler both sides all along with that low an oil pressure.

Mr Maine

10-11-2017 10:07 AM

What oil pump and internal bypass spring? Did they weld the pickup on possibly weakening the spring? What bearing clearances? 38psi is low for up and running on plane

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