db 995 blowing oil need some help

terry brooks · Sep 24, 2013

i put a head gasket on my david brown 995.it stopped all the blow by out the filler and dip stick.i had the head checked and they took 19 thousands off.the tractor now blows oil out the stack and burns blue smoke.i put a new lift pump on becuase i thought i had diesel in the oil.i put dye in the fuel but the oil looks like it has dye in it from the jug.so you cant tell the dye from new oil.could it be a valve?they didnt do the valves when i had it checked. is there a good way to tell whats going on with it?im pulling out my hair with this. thanks for the help.

RGMartin · Sep 24, 2013

Does it burn any oil? Does it start good cold? Does the smoke clear up when it gets up to operating temperature(180 or better)? DO you have a temp gauge?

Thad · Sep 25, 2013

If all you changed was a head gasket and you had blow by before the head gasket couldn't change that unless it was badly blown and pumping compression into the crankcase. I have worked on many of these engines and 99% of the time when you have bad blowby you have broken pistons from starting fluid. The substance you see as oil is unburnt fuel that collects is in the manifold. Your cylinder temp isn't hot enough to burn all of it unless you pull the thunder out of it. We just done a 1390 2 weeks ago the man just bought it. His complaint oil slobber out the ex and smoked badly. The first thing I looked at was the blowby couldn't find the hose until I opened the hood. They had it run back into the intake to hide the blowby. I knew then what needed done found 3 broken pistons in it. These engines don't like large amounts of starting fluid and it will destroy them if used carelessly. Thad

Thad · Sep 25, 2013

Here is what the damage looks like to a piston.

terry brooks · Sep 25, 2013

the head gasket was blown from cylinder to oil chamber and i had bad blowby out the dipstick and oil fill plug.when it was replaced all blow by stopped. now i have black stuff coming out the muffler and blue smoke.i think it might be a bad injecter flooding the piston with fuel.i drained the oil today and i dont think i lost any oil and there seems to be no fuel in it.1 injecter was wet other 3 was sooted heavy.tractor starts easy and run good. never used ether it dont need it.just blue smoke and black rain.thanks for the help.

Thad · Sep 25, 2013

That's good then if the gasket was blown that way. Does it get up to temp? I would for sure check the injectors if its not spraying right and the engine runs cool it wont burn clean. You probably don't pull it very hard and its loading up with unburnt fuel. I have had them do that put them on the dyno and getem up to temp and under a load. Then they will burn clean until the engine cools back down then they will do it again. Sounds like you have it narrowed down good luck. Thad

terry brooks · Sep 25, 2013

just wanted to add that the tractor had not been using oil in the past.the tractor smokes on start up and doesnt clear up at all now. use to run clean out the stack.the muffler was wet today .looks like fuel and soot mixed.they oil change was only 4 hrs on tach but i drained and measured it at 8 quarts today.the tractor has a new radiator and temp guage and it gets up to operating temp.

terry brooks · Nov 1, 2013

well i hope to have my problems fixed.i rebuilt the injecters and it did not help so i pulled the injecter pump and had it rebuilt.after running it for about 45 mins it seems to not be smoking out the stack.came up to tempture a lot faster.they said the pump had lots of seal problems.all the slobering out the stack seems to have stopped.sure was hard to get started after the pump was put on.

db 995 blowing oil need some help

terry brooks

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RGMartin

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terry brooks

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