Re: Re :[Amel Yacht Owners] Re: Perkins M 4 .154 engine repairs, rescheduling trip
I think Joel was right on with his diagnosis:
More than likely your problem is the crankshaft bearings and the connecting rod bearings clearances are too large. As the engine warms the expansion of components causes the clearances to increase even more and hence the oil pressure to go down.
With best regards,
Sailing Vessel - Cream Puff - SM2K - #275
Currently cruising - Martinique
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Sunday, December 31, 2017 12:53 PM
Subject: Re: Re :[Amel Yacht Owners] Re: Perkins M 4 .154 engine repairs, rescheduling trip
I am afraid I have no good ideas that match your symptoms! Since you have both the gauge and alarm reporting low pressure, I have to assume it is real and not a problem with the measurement.
Sometimes low oil level can cause low pressure at high rpm as the pump sucks so much oil out of the crankcase it sucks air, but you checked that.
A stuck open pressure relief valve that resets itself when the engine shuts down could be an an issue, but that seems unlikely.
Maybe someone else has an idea or two... in any event do let us know what the solution turns out to be!
Key West, FL
Yes - oil pressure gauge and l'os pressure alarme on
When oil pressure below 1 bar, alarme nées
Oil pressure drops quickly at 2000 rpm
Oil pressure remains stable when low or normal
Oil pressure remains low when reducing speed from 2000
No loss of oil single de started.
Ran 1hour maneuvring in port at 1300 rpm at 2 bars, went To idle after 1 hour at 700 rpm with 1.1 bar oil pressure.
Did not risk acceleration.
Thks for assiste
Christian alby - Desirade VIII - Maramu 116 - now in Mindelo Carbo Verde