On Jan 23, 2018, at 3:06 PM, christian alby calbyy@... [amelyachtowners] <amelyachtowners@...> wrote:

James

Thanks for assistance

 I do not remember the way the gear is fixed but will try to see from pictures taken.

The non-marine version -perkins made, not the kubota look alike - has the same oil pump.

Fair wind

Christian alby - Desirade VIII - Maramu 116 - now in le Marin Martinique

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Le mar., janv. 23, 2018 à 15:33, James Alton lokiyawl2@... [amelyachtowners]

<amelyachtowners@...> a écrit :

 

Christian Alby,

   I have been keeping my eye out for a replacement pump for you but so far no luck.  I think that you are correct that the worn pump is at least part of what is causing the lower than normal oil pressure.  The sudden drop of oil pressure to 0 when you reach 2000 RPM is very strange and I have been pondering a possible cause.  It makes me think that somehow the pump gear has sopped stopped turning.    Did you notice if any of the gears on your oil pump are pinned to the shaft?  I have seen some oil pumps secured with pins but am not sure about the Perkins 4.154, hence this is just an educated guess.  If one of these pins were to shear from the engine runaway and lack of lubrication which you said occurred when the engine failed,  you might still have enough friction present to drive the pump gear at low engine speeds but it could then begin to slip.  Replacement of that pin (if it exists) might solve the problem with the sudden loss of oil pressure.   Please let me know if you someday figure out what is the actual cause of this sudden loss of oil pressure.   I will post here if I am able to find another pump.   Can you tell me from your research if the non-marine version of the 4-154 has the same oil pump as your engine?

James

SV Sueño

Maramu #220

On Jan 23, 2018, at 8:15 AM, christian alby calbyy@... [amelyachtowners] <amelyachtowners@...> wrote:

Miles,

The  voice of Volvo D2/55 la 3 fold 

Available immediatly in Martinique.

Do not want a turbo on my marine engine, useless & more prone to failures.

Recent model , widely spread, will find parts for a while.

Against volvo

Tied up with agents for service & parts.

Price ...

I still might give up on replacement here in martinique & keep on looking for an oil pump to do repairs, then sail to better deal location.

Note : old faithful M 4.154 is still reliable & so easy to run & maintain. Regrets 

Christian alby - Desirade VIII - Maramu 116 - now in le Marin Martinique.

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Le mar., janv. 23, 2018 à 8:37, smiles bernard smilesbernard@... [amelyachtowners]

<amelyachtowners@...> a écrit :

 

Hi there Christian

As a fellow maramu owner with an older engine I’d be interested in your thoughts about the Volvo D2/55 as a replacement vs other alternatives. 

Size, simplicity, cost etc? What led you to choose the Volvo?

Many thanks and best wishes 

Miles

On 21 Jan 2018, at 14:29, christian alby calbyy@... [amelyachtowners] <amelyachtowners@...> wrote:

 

Thanks for concern & assistance Bill

guess all the advice & analysis of fault helped me come to the conclusion (already uderstood & applied before) that there is no shortcut when repairing engines or sailing boats. 

Oil pump is at fault - 100% sure

camshaft is unllikely eve though showing some wear on,poppets.

I am now in Le Marin, waiting for a firm quote on one Volvo D2/55 available for fit up ... on solution even though unplanned this year;

I am also looking for one Perkins Oil pump .... could replace in situ at no great cost & would postpone replacement by new engine to 2019 

or back to Europ in April & do a change over of engines with Perkins or else ... Selling back my 'Old Faithful'

fair winds 

chrsitian alby - Désirade VIII - Maramu 116 - Le Marin Martinique

Le ‎dimanche‎ ‎31‎ ‎décembre‎ ‎2017‎ ‎12‎:‎53‎:‎11‎ ‎-04, greatketch@... [amelyachtowners] <amelyachtowners@...> a écrit :

 

Christian,

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!

Bill Kinney

SM160, Harmonie

Key West, FL

---In amelyachtowners@..., wrote :

Here is

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

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Le dim., déc. 31, 2017 à 14:58, greatketch@... [amelyachtowners]

<amelyachtowners@...> a écrit :

 

Losing oil pressure at high RPM and having it come back at low RPM is a bit of a puzzle to me.  There are ways it can happen, but they are a bit exotic

Do you have an oil pressure gauge AND an low oil pressure alarm?  

If so, is the gauge showing low pressure AND you get an alarm?  

Does the oil pressure drop quickly at 2000RPM or does it drift down slowly?  

Is it stable, or does it bounce around?

Does it come back quickly when you reduce the RPM, or does it stay low?