Mcx Nytro 180 burning oil and smoking

[judger101]

So i was out riding my nytro today and it started to smoke. I knew right away that it was burning oil due to the smell and the fact that it wasnt very white. I checked my antifreeze just to be sure and it wasnt going down at all. got the sled home and started doing research on here. there is oil in the engine compartment that appears to be coming from around the intercooler and it looks like some oil was getting pushed out of the breather that comes off the intercooler. it was smoking and then right after i noticed it my low oil light came on, i shut it right down.

from what i have researched i am going to check the mcx oil pump to check that the shear pin isnt broken. i am also going to check the oil return line, from what i have read the oil is backing up and bleeding from the turbo into the exhaust and causing the oil to be burned from the engine? does this sound right? so i need to check anything else like oil in the precooler or intercooler? would the oil return line or oil pump failure cause oil to be backup up through the precooler and intercooler and be the cause of some engine oil in my engine compartment? i am not an expert at all in these turbos, but i am fairly handy and would like to try and figure this out. what are other things i need to check and if it is one of these things is there anything else that could have been hurt by this oil burning backup issue?

thanks for your input, im going to tear it down further tomorrow and try and figure this thing out.

 

[MRFUSION]

Most likely the sheer pin in the pump on the end of the engine case. You will have to disassemble the pump and screw in 2 bolts into the housing and put a bar between those screws turning the housing out of the mag casing. The pin will be in the end of the pump shaft fitting into the magneto bolt. You can get the pin from MCX or I have a Yamaha pin part number at the shop that will work as a good replacement. Broken pin will be in the magneto somewhere most likely. Good luck. Cheers. Shad

 

[judger101]

I hope its as simple as that , any other thoughts
O by the way go pack!

 

[TBird]

Oil in the enhine compartment?
Could be frozen crankcase vent hose.
I have a hard time see that it can be due to oil return pump, in that case oil burns @ the turbo, not leaking in the engine compartment.

 

[silver rocket]

Check your turbo return oil line and vent line. Could be plugged or pinched.

 

[kimoajaj]

Just so you know you can make a new sheer pin of a 3mm drill bit. Just cut it to a suitable length and you are good to go. (Erik Marklund told me this, so it is safe!)

What is your milage with turbo?

A friends Phazer did the same when the sheer pin called it the day.

I bet its the sheer pin!

If it is, you will have to remove the stator cover to looks for pieces of it, also maybe unscrew the stator itself and look behind ut.

Remember to use loctite (243) on the threads of the oilpump when you put it back on.

 

[judger101]

So the sheer pins are ok, now its on to checking the lines, what isthe best way to check them just blow air through them?

 

[kimoajaj]

Hmm ok.

I guess blowing air through them will do, if you put your mouth to it you should able to blow through them without any problems.

I guess you only have to check the line that goes to the pump and the one that goes to the MCX plenum.
Check if your banjo plugs somehow can be plugged and also check that the oil outlets of the turbo are open.

I wonder if it is possible for a turbo oil hose to collapse inside the steel surrounding due to the high temp?

Keep us posted!

 

[judger101]

thanks for the help on this! im going to check the lines tonight, i was going to yesterday but of course my propane tank ran out so i didnt have heat. ill let you know how it goes.

 

[rxrider]

If the turbine bearings are shot you will blow oil out the exhaust, a lot.
The oil in the engine compartment makes me thinking about detonation.
How does she start, like before or hard to start.
Tbird is onto something, could be what he suggests.

 

[sledneck22]

Best way to check the lines is to follow them from point A to point B.
I just got my custom turbo going a couple weeks ago and had a fitting break on my supply line. You never know what is going to break.
Does the MCX kit use the oil supply tap from the oil filter? I would start there if you have oil dripping from your engine compartment.

 

[judger101]

If the turbine bearings are shot you will blow oil out the exhaust, a lot.
The oil in the engine compartment makes me thinking about detonation.
How does she start, like before or hard to start.
Tbird is onto something, could be what he suggests.

engine starts fine and sounds good. the vent off the intercooler did have ice and snow buildup on it... could have maybe pressureized things up?
what could i check to see about if it was detonating?

Could an iced up vent line off the intercooler cause oil to be burned and shoot out the exhaust?

So i could possibly have 2 issues, one causing the oil to shoot out exhaust and one for oil in the engine compartment? I hope it's just ONE thing!

 

[judger101]

Best way to check the lines is to follow them from point A to point B.
I just got my custom turbo going a couple weeks ago and had a fitting break on my supply line. You never know what is going to break.
Does the MCX kit use the oil supply tap from the oil filter? I would start there if you have oil dripping from your engine compartment.

yes the supply line taps off of the sensor down by the oil filter. i will for sure check that.

 

[sledneck22]

Yeah, if your line is like mine where it taps off the oil sending unit hole (1/8" npt), that could be where it broke. That's exactly where mine did. I'm waiting for a stainless steel fitting to show up where I used Brass initially.

 

[rxrider]

You did not detonate as your sled starts fine and runs normally.

If the breather is blocked the pressure inside the engine have nowhere to go and will push past the piston rings pushing oil into the combustion chamber and out the exhaust.
And it will smoke black smoke as the oil is burnt.
If you have white smoke there's an oil leak inside the turbo.