David Brown 3800 oil pressure?

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dbnewbieoh
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Joined: Tue May 22, 2012 4:08 pm
Location: Ohio USA

David Brown 3800 oil pressure?

Post by dbnewbieoh » Wed May 11, 2016 2:30 am

Hi, I'm looking at a David Brown 3800 with the gas 2.4.....start up oil pressure 20lbs......What should the oil pressure be?
Thanks,Mike

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dbnewbieoh
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Location: Ohio USA

RE: David Brown 3800 oil pressure?

Post by dbnewbieoh » Thu May 12, 2016 11:01 am

It's the 146.1 that's in the 885 also right?

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ollek
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RE: David Brown 3800 oil pressure?

Post by ollek » Thu May 12, 2016 12:51 pm

basically the same engine was used in 885, 1190 and 1194, but as a diesel version. The engine type was 3/55, where 3 is for 3 cylinders and 55 for the displacement in one cylinder in cubic inches. This same engine was called 165 in the US, as 3 times 55 is 165 cubic inches. The officially correct total displacement was 164,4 cubic inches. The 3 times 55 gives a total displacement of 2,7 litres. The engine was offered as a gasoline version in the 3800 tractor, that was built for the US market.

broadsword
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Post by broadsword » Thu May 12, 2016 4:57 pm

Mike,

20 lbs sq inch sounds low on start up - normally on a cold engine you`d be looking at 35-50 psi start up dropping when warm - 20 psi is more like the pressure you`d expect when the engine is hot/warm on tickover.

I`m not a mechanic so perhaps others may like to comment - whats the pressure when warm on ticover???

Only other thing is ( I assume she has an oil pressure guage????), is the pipe clear to the guage, a small blockage can cause all sorts of issues.

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bababoy
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Post by bababoy » Thu May 12, 2016 6:06 pm

my gas 885 maintanes 40 lbs of oil pressure at start up and and just a little below after 2 hrs of mowing

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mc
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Post by mc » Thu May 12, 2016 11:08 pm

While olleks explanation of the engine designation is correct for the 4600 model, the 3800 is different.

My understanding is that the 3800 engine is a gasoline version of the white 770 diesel engine (ie 3/49 100 mm bore x 4 inches stroke) so a capacity of 3.4 litres (147 cubic inches) is approximately correct.

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