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Old 04-04-2010, 11:23   #1
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Join Date: Nov 2009
Location: Grenada
Boat: Beneteau Idylle 15.5m
Posts: 160
Question Live with Blowby, or Death Soon ?

So I'm getting to know the genset on my boat. I know the prime mover is an 1995 Perkins 103-07/Perama M20. After cleaning up the nasty mess in the lazarette where it is mounted, I routed the crankcase breather into a plastic bottle. After running the engine for about 20 hours, I can see a small amount of oil, which I expected. When I hold my finger over the breather with the engine running, it will build up pressure over about 15 seconds, enough that I can feel the air running out when I let my finger off. So, I have some blowby.

Is this something that I should expect in an older engine, and can live with for months or years, or is it a sign that the diesel is on its last legs and will soon give up the ghost if I don't do a rebuild?
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Old 04-04-2010, 12:27   #2
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Location: North to Seattle
Boat: Cooper 416
Posts: 280
I have the same problem.I'm looking into a Walker Airsep to solve it.Without puting a ton of money in it.
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Old 04-04-2010, 14:03   #3
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Location: Oriental, NC
Boat: Mainship Pilot 34
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The blowby that you describe is actually small. If you hold your finger near the crankcase vent and feel pulses of exhaust gas then you have a blowby problem. If you don't and it sounds like you do not, then you will be fine.

There was quite a thread on blowby puke bottles and how to plumb them over on boatdiesel. It will cost you $25 to join and then be able to search old posts, but it will be well worth it.

BTW, they don't think much of Airseps.

djmarchand is offline   Reply With Quote

engine, perkins, perama

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