David Brown 880

BJS

Member
I have a David Brown 880 Selectamatic diesel tractor. Excessive oil is leaking, at a rate of about a quart
an hour, from the exhaust breather on the underside of the engine, next to the oil pan. Is there any way to
tell if the engine oil filter by-pass valve is clogged or not functioning properly? Also there is an oil
pump wire filter within the oil pan that also has an oil relief valve on it. They look clean, can I assume
they function? Could clogged oil by-pass valves be the cause of excess oil loss from the exhaust breather?

Any help would be greatly appreciated.

Thank you,
Tom
 
A typical reason for oil loss out the crankcase breather of an engine is lots of "blowby", combustion products leaking past the piston rings due to wear or damage and pressurizing the crankcase.

I don't know if it ever happens with your particular engine, but if the top of the cylinder head/rocker arm area gets sludged up, oil draining back to the crankcase can be slowed, causing oil to get tossed "overboard".

Probably not your problem, but fairly easy to check for.
 

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