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08-03-2019, 02:35 PM
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#1
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Guru
City: Long Beach, CA
Vessel Name: Aquarius
Vessel Model: Californian 55 CPMY
Join Date: May 2018
Posts: 577
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Caterpillar oil leak up on top
I have Cat 3208s. My Stb engine is a Cat long block replacement with 230 hours on it. Oil is appearing in the valley between the two sides. No problem on the port engine. This oil was there when I purchased the boat. It did not rise to the level of dripping into the bilge so I just figured I'd look into it later. So I'm now looking into it. Where might this be coming from?
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Aquarius 1991 Californian 55 CPMY Long Beach CA
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08-03-2019, 03:50 PM
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#2
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Guru
City: Clearwater
Vessel Name: Seas the Bay
Vessel Model: 1981 Hardin 42 Europa/Sedan
Join Date: Aug 2016
Posts: 1,869
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Valve cover gasket?
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08-03-2019, 04:35 PM
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#3
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Wipe it up and watch it. Find the source.
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08-03-2019, 05:32 PM
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#4
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 19,135
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Clean the engine up. Maybe put some dye in the engine oil and use a black light to see where it starts appearing.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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08-03-2019, 05:39 PM
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#5
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Guru
City: Tacoma, WA & Ashland, OR
Vessel Name: boatless, ex: Seeadler
Vessel Model: RAWSON 41
Join Date: Jun 2016
Posts: 2,018
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I have a pair of 3160s that accrue a trace that puddles in the little recesses here andthere, valve covers etc Never seems to run off. My mech says they come from the crankcase breather, no issue, just wipe up occasionally.
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08-03-2019, 06:59 PM
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#6
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Guru
City: Long Beach, CA
Vessel Name: Aquarius
Vessel Model: Californian 55 CPMY
Join Date: May 2018
Posts: 577
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Quote:
Originally Posted by AlaskaProf
I have a pair of 3160s that accrue a trace that puddles in the little recesses here andthere, valve covers etc Never seems to run off. My mech says they come from the crankcase breather, no issue, just wipe up occasionally.
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I'll check for the crank case breather wherever that is. Maybe last oil change was an overload. No I didn't do it. Previous owner's guy. I am just about to do an oil change. I don't quite have 100 hours yet and I'm in no hurry to deal with all that oil, both coming our and going in. My leak is kind of the same with the oil pool not seemingly going or coming, just being. I'm getting ready to start taking stuff apart o I can see but lately I've just been using her.
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Aquarius 1991 Californian 55 CPMY Long Beach CA
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08-03-2019, 11:26 PM
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#7
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Guru
City: Anacortes
Join Date: Nov 2012
Posts: 1,188
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It’s oil not diesel right? Sometimes you can get a leak from the injection pump that would pool in the valley.
The head gaskets I’ve had let loose typically made a mess on the outboard side of the heads, but that is just my experience and I hope to never be any expert on additional failure modes. Crank breather if it slobbers usually runs outside since it sits on the valve cover.
As already said, clean it up and trace it.
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08-04-2019, 04:57 PM
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#8
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Veteran Member
City: Abbotsford BC
Join Date: Jan 2019
Posts: 42
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Quote:
Originally Posted by Ski in NC
Wipe it up and watch it. Find the source.
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Start here. What could be more obvious?
__________________
"It's never too late to have a happy childhood." — Tom Robbins
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08-04-2019, 07:16 PM
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#9
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Senior Member
City: punta gorda, FL
Vessel Name: Blue Bayou
Vessel Model: Hatteras 43MY
Join Date: Jun 2016
Posts: 149
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There are 3 (I think) short hoses on each crankcase breather assembly. Clean them up good, then wipe underneath after running the engine. You’ll probably find one or more of them weeping. The breather assembly itself might be leaking; I’ve rebuilt one of mine so far, not a big job, but one that pretty much requires 3 hands.
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Punta Gorda, FL
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08-05-2019, 05:41 AM
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#10
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Guru
Join Date: Jan 2010
Posts: 1,149
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Check the aircleaner. To see if any part of it is saturated with oil
That's what is happening on my 3208. I believe it is happening from running at low speed
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