[C320-list] {Perkins wear & lifespan Crankcase] Vent Question

[Robert E. Sloat]

Warren-I have Hull 894 (2002) which has a Yanmar 3GM30F engine.  There is a 
breather hose connecting the back of the valve cover to the intake manifold. 
This engine is a push rod design and the camshaft is located deep in the 
engine, so I assume any blow by from the crankcase works it way into the 
valve cover through the push rod passages and eventually into the intake 
manifold.  I see nothing else on the engine or in the factory engine manual 
showing any vent from the crankcase.

This may be the same for Perkins engines.

Bob Sloat
Savannah Hull 894
----- Original Message ----- 
From: "warren updike" <wupdike at hotmail.com>
To: <C320-List at Catalina320.com>
Sent: Tuesday, December 30, 2008 12:31 PM
Subject: Re: [C320-list] Perkins wear & lifespan


> Our 1994 #62 has 1,000 hours. I've had the air intake off a few times and
> never saw an oily residue. Perhaps you need to adjust the valves.  If you
> haven't already done so, I would consider replacing the injectors.
>
> It's my understanding that diesel engines such as these if run hard and 
> well
> maintained can deliver far more than 5,000 hours.
>
> Question for the list: In any IC engine there is some blow-by from the
> cylinders into the crankcase. Gas engines have a crankcase vent. Can 
> anyone
> tell us how this blow-by is vented in our little diesels?
>
> Warren & Pattie Updike
> Catalina 320, #62, "Warr De Mar"
> Middle River, Chesapeake Bay
>
> -----Original Message-----
> From: Bernie Garrett [mailto:berniegarrett at telus.net]
> Sent: Sunday, December 28, 2008 9:55 PM
> To: c320-list at lists.catalina320.com
> Subject: [C320-list] Perkins wear & lifespan
>
> Hi folks,
>
> Seasons greetings. On working on the Perkins M30 in my boat I noticed an
> oily residue in  the inlet manifold when I took it off to clean it and
> change the air filter.
>
> I wondered how normal this was or if it is a sign of blow back through the
> valves? The engine seems to run fine in terms of temps and oil pressure 
> and
> the power seems Ok. It has 3200 hrs on it and I am trying to figure out 
> how
> much I should invest in future maintenance before I consider repowering.
> The old owners suggested 5000 hours wasn't unusual for diesel engines, but 
> I
> don't know. Thoughts?
>
> Regards
> Bernie
> _________________________________________________
> Dr. Bernie Garrett,
>
> 1006 Eden Crescent
> Delta, BC, Canada, V4L 1W7
>
> Tel: 604 943 3792
>
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