[C320-list] Perkins wear & lifespan

[Robert E. Sloat]

Bernie-See my note of today on crankcase vents.  An additional thing I 
noticed in my Yanmar factory service manual is that the breather located in 
the valve cover has a few twists and turns and baffles.  This keeps 
lubricating oil that lubricates the rocker arms in the valve cover from 
being diverted through the breather which connects to the intake manifold by 
a rubber hose.  There are drain holes in the breather that allow any 
accumulated oil to drain back into the valve cover and eventually back into 
the lubricating oil circuit.

Maybe Perkins has a similar design and one of the drain holes in the 
breather is plugged or partially preventing lubricating oil from draining 
back into the crankcase and instead going into the intake manifold.  That 
may be the cause of the oily film in your intake manifold.

Bob Sloat
Savannah 894

----- Original Message ----- 
From: "Bernie Garrett" <berniegarrett at telus.net>
To: <c320-list at lists.catalina320.com>
Sent: Sunday, December 28, 2008 8:54 PM
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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>