nytro crankcase pressuring?

[t_thall]

While trying to sort some rb3 issues out the other day my turbo nytro started burning wicked amounts of oil. Pulled it into the shop fearing the worst (RB3 issues were causing it to go brutal lean) and pulled the turbo off first - there was oil in the intake and exhaust sides. Inspected a little further and found my return line was collapsed and plugged off so i changed it. While it was apart i plugged the oil lines and ran it without the turbo - zero smoke. Re-installed everthing and ran it , it was smoking but not as bad. Went for a rip thinking it was residual oil in the exhaust housing, smoked a little on the ride but not bad. Slowed down to an idle and the smoke came rolling out (it was also worst at idle the first time). Has anyone had seals fail after they were pressured bad? I don't think it could be blow-by pressuring the seals cause that should get worse with load and boost. I have checked the oil tank vent and it is good...

 

[Sleds R Fun]

Not sure how your Turbo is oiled, but maybe the oil pump for the Turbo if it's a "pull" pump. Oil is getting to the turbo but not enough pressure in system for the oil to continue circuit. Just a thought! good luck.

 

[Mountaintech]

Do you have a restrictor in your oil supply line to turbo? How does your turbo oil return to the engine oiling system?

 

[robrstopr]

Mine did same thing last weekend in the snowies. Blew the motor the next day. Might be to late for you. I'd get it checked now. Mine starved of oil and threw rod threw case total motor loss.
Oil in Muffler, Bad sign, that was the only oil I had as a sign before she let loose. Mine did not smoke unless under boost, and then when I stopped it was like it was on fire.

Pull ur oil res, take cover off ur turbo oil return. spin primary and c if its working. If not u need new return pump. Could be pushing oil past turbo seal as the return pump not operating.

 

[t_thall]

i do not have a return pump, there is about a 4 inch line from the turbo and it is tapped into the block in the cam chain housing - gravity feed. There is a restricter in the pressure line. I don't think it is the engine as i ran it without the turbo and there is no smoke. It also has oil pressure cause the light goes out right after it starts. Oil is coming out of both sides of the turbo. It makes me think crankcase pressure cause it is unlikely that both seals went at the same time. This oil system worked all last year without burning a bit...

 

[sledfvr]

My Rx-1 just did the same thing. The return got pinched. It filled the intercooler and exhaust housing full of oil. Once I got all the oil out of the intercooler and it burned it out of the exhaust everything was fine. It smoked like mad for the better part of a ride though.

 

[sledfvr]

I bet your still running the oil that's in the intercooler through the motor. Pull off the i/c and slosh some gas around in it and dump it out. Should be good to go then.

 

[t_thall]

i did slosh fuel through the intercooler and pulled both turbo housings off and washed them out with brake clean. I thought is was residual left at first until the smoking got worse. Was thinking maybe if blow-by was bad that the dry sump wouldn't be able to keep up but it gets better when you rev it up...

 

[andre162]

Try a bleed down test to check piston damage. should help elimanate some items

 

[08nytromtxa]

smoke

if you are running a muffler it would have filled it up.. my pump never worked one cold morning and blew oil past turbo and it took a couple good rides to actually burn the oil out of muffler and stop smoking. i thought my seals were gone to but two years later now seals are still good.

 

[t_thall]

no muffler, just a 12" long 3" dump pipe. Was talking to another guy who had a leaky suction hose on the oil tank and it would do the same thing. I took it for a rip and it burns zero oil until i let it idle so i'll have a look at the hoses

 

[t_thall]

Figured out the problem, After i changed the drain i checked the turbo seals (don't dissassemble a ball bearing garrett unless you have a lot of time to kill and have rebuilt turbos before BTW), I did a compression test - 175-125-170. Pulled it all apart and the exhaust side ring lands are pinched down on all three pistons. Dave at Hurricane said that it happens when run excessively lean (which is exactly what happened when my RB3 crapped out). But its not all bad as the bores are all perfect and dave is giving me a pretty good deal on another set of JE pistons (Three new JE pistons are still cheaper than 2 bombardier 800 pistons, haha, a lot more time to change though...) So with the new boost-it installed and slugs on there way hopefully i"ll finally get some use out of this unit!