Engine oil pressure??

[dignity]

I've put an offer in on a new toy, well old toy actually! It's a Freeman 33 Sports, with twin Ford Sabre 80hp, I'm just wondering what oil pressure these engines should run at considering they're 24 years old with unknown hours?

Also has anyone had experience of changing a complete set of engine mounts because I know these definately require changing!

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[ccscott49]

My old ones had 60 psi hot, they had 7000 hours on them.

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[dignity]

Mmmmmmmm, I think there's something amiss then it was showing around 40-45 cruising revs and 30-35 warm idle. Having said that she's been stood 2 years with nothing done to her, oil and filters will be knackered by now, might make a bit of difference with a good service? or not?

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[boatone]

<A target="_blank" HREF=http://www.sheridanmarine.com/>Sheridan Marine</A> at Moulsford seeem to be wise in all things Freeman. Theres even an owners club there.

<hr width=100% size=1><A target="_blank" HREF=http://www.boatsontheweb.com/> Website, Photo Gallery, Chat Room, Burgees</A>

 

[ccscott49]

I wouldn't be worried about those pressures, even with old oil. 30-35 at idle warm is ok and 40-45 at cruising revs would do for me, if the pressure drops to 10-15 at idle engine hot, you've got problems. I would just change oil and filters, using the correct frade of oil, you might be surprised. Do they burn oil? Thats the first sign of knackered fords, they all smoke at startup, but should clear quite quickly, once they are warm.

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[dignity]

Thanks for that, yes they do smoke but nothing excessive, the smoke didn't clear completely when warm but I've seen far worse, couldn't really tell if they were using oil only ran them for around an hour. I can say the oil was black but no sign of milkiness and the coolant was uncontamited (although rusty) so I think I might take a shot at this one.

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[miket]

Don't expect too much speed from this engine combination.
The more common set-up was 2 x 120 or 150 hp, which then gave around 20 knots.
I think with 2 x 80's you will max' around 10-12 kts.
Nothing wrong with this as long as it is what you are expecting.

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[dignity]

Not a problem 90% of use on Humber estuary, 2 weeks a year up the coast, should suffice, anyway when you live on a barge what only does 4 knots 10-12knots almost makes me dizzy!!

But a fair point, probably why I picked it up cheapish well I think it's cheap, also it has got the pox, that's the first job to be done.

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[tr7v8]

Good old rule of thumb for oil pressure is 10PSI for every 1000RPM, nadge higher would be needed for diesels say 15.
It's probably turning all manner of muck around in there so clean oil and shiney new filters should bring it up a bit and a further change shortly after when the detergent has all the muck out.
Presumably this is the old Ford Cargo engine in non-turbo form.

<hr width=100% size=1>Jim

Draco 2500

 

[dignity]

Thanks for that, don't know what base engine is, just know it's a straight 4, producing 80hp.

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[BarryH]

Doubt its the old Cargo engine. Being as old as they are I would have thought more like the D series engine. They weren't known for they're power but will plod on for years with regular oil changes.

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[miket]

I'm impressed !
On that basis - 2,800 rpm x 15 = 42 psi.
So my TAMD61A's start about 60 and reduce a bit when warm.

Presumably the newer higher revving diesels have a different formula?

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[tr7v8]

To be honest it's a formula that comes from shimming oil pressure release valves on fast road and race engines. Some people run ridiculous pressures, like 80-90 when hot and god knows what when cold. Aside from potential to knacker oil pump drives when cold, it wastes a fair few horsepower, Diesels run tighter bearing clearances than petrols and do lower revs with much higher bearing loads, hence my guesstimated 15 rather than 10. It's a linear thing, in that losses through the bearing clearances rise as the revs go up. If you're really curious it's due to the centrifuge effect of the oil holes in the crankshaft.

<hr width=100% size=1>Jim

Draco 2500