2860 won't stop blowing oil!

[snowfix]

Starting spewing oil out the exhaust. Thought I had a plugged crankcase breather or a pinched return line but everything looks good. took the return off to make sure it was pumping, doublechecked that the restrictor was inline.

If I put my hand over the exhaust at an idle it is dripping with oil. I thought the seals on these things were almost bullet proof?

 

[Ted Jannetty]

Starting spewing oil out the exhaust. Thought I had a plugged crankcase breather or a pinched return line but everything looks good. took the return off to make sure it was pumping, doublechecked that the restrictor was inline.

If I put my hand over the exhaust at an idle it is dripping with oil. I thought the seals on these things were almost bullet proof?

This is a problem that pops up quite often and usually is NOT the turbo.

Once the exhaust fill with oil it is nearly impossible to get it out without disassembly and cleaning.

Possible causes are too big a restrictor, that turbo requires a 0.035,
Oil drain line too small or kinked, or not downward enough.
plugged or even slightly restricted crankcase breather.
broken piston rings causing excessive crankcase pressure pushing oil past seals on turbo.
Ice build up on breather.
too much oil in system

Ted.

 

[mbarryracing]

Ted is right on, along with that you need to narrow it down to the turbo or engine as the culprit of the oil weep.
Is this a new build or does this sled have some miles?
If it uses a scavange pump to return the oil from the turbo, start by making sure that is working properly.

 

[snowfix]

The install has about 400 km on it. It happened last ride coming off the mountain. It was a freshly groomed trail and it was the first time I'd had it at high RPM for an extended period of time.

I took it apart as Ted suggested and cleaned everything out. Put it back on the sled with everything removed except the exhaust so I could really watch it. I removed the return line too and had it drip into a pail. Fired it up and leakage seemed like alot less but not dry. Should it be? I'm getting a few dribbles on the charge side too.

Then I hooked up the regular return and it definetly got worse, but the scavange pump was working. It might have been a bit slower but not much.

I did a leak down test and everything passed. Besides, the oil coming out the bottom of the turbo doesn't appear to be a super strong flow. If it were crank case gases would it not be coming out fast?

This might be a silly question, but does the crank case vent through the oil return line and out the top of the tank?


This problem is getting frustrating, not to mention messy!! I certianly appreciate the help.

 

[Ted Jannetty]

The install has about 400 km on it. It happened last ride coming off the mountain. It was a freshly groomed trail and it was the first time I'd had it at high RPM for an extended period of time.

I took it apart as Ted suggested and cleaned everything out. Put it back on the sled with everything removed except the exhaust so I could really watch it. I removed the return line too and had it drip into a pail. Fired it up and leakage seemed like alot less but not dry. Should it be? I'm getting a few dribbles on the charge side too.

Then I hooked up the regular return and it definetly got worse, but the scavange pump was working. It might have been a bit slower but not much.

I did a leak down test and everything passed. Besides, the oil coming out the bottom of the turbo doesn't appear to be a super strong flow. If it were crank case gases would it not be coming out fast?

This might be a silly question, but does the crank case vent through the oil return line and out the top of the tank?


This problem is getting frustrating, not to mention messy!! I certianly appreciate the help.

Have you verified 0.035 restrictor?
Does you turbo have Coolant Lines circulating coolant through the turbo?
Is the Scavange pump Working OK, should almost creat a vacuum on the bottom of the turbo drain.

 

[snowfix]

The kit came with a restrictor but I'm not positive on the size. I am running coolant through it as well.

I'll do a test on the scavange pump to see what kind of suction power it has.

 

[mbarryracing]

Stick the return line off the turbo in a small container of oil to see that the pump draws it down...

 

[snowfix]

It appears the scavenge pump is pooched. It was passing oil under pressure but not actually helping.

I was considering spending a little extra to get a tougher one. Anybody seen one of these that are designed for motorcycles.



http://www.rbracing-rsr.com/oilsystems.htm

 

[mbarryracing]

Those work great, they will pump sand if they have to...

 

[Ted Jannetty]

It appears the scavenge pump is pooched. It was passing oil under pressure but not actually helping.

I was considering spending a little extra to get a tougher one. Anybody seen one of these that are designed for motorcycles.



http://www.rbracing-rsr.com/oilsystems.htm

Excellent choice.

 

[snowfix]

Thanks for the help. Much appreciated.