Turbocharger or engine smoking ????????
I've rebuilt the Hitachi HT18 turbo twice, the turbo oil input line/fitting is not leaking and yet I am getting oil seeping between the turbo and the exhaust manifold.
Where is the oil most likely to be coming from, turbo or engine? The engine was rebuilt and has about 8 hours running time on it. |
Run the engine without the turbocharger attached. It will be loud, but it may answer your question.
Remember to block off the oil/coolant. |
any thrust play in the turbo?
i assume the smoke is coming out of the tailpipe and not just burning off of the manifold? |
Originally Posted by K-Tune
(Post 11189586)
Run the engine without the turbocharger attached. It will be loud, but it may answer your question.
Remember to block off the oil/coolant. |
Originally Posted by RotaryEvolution
(Post 11189609)
any thrust play in the turbo?
Not much, I changed the journal bearings, thrust collar and thrust bearing. i assume the smoke is coming out of the tailpipe and not just burning off of the manifold? |
Had the same leaking on a rebuilt stock turbo - a BNR stage 1.
Added a restrictor to the oil feed and no more leaking between the cartridge and turbine housing. |
BNR is a little different since he removes the restrictor plate which is inside the turbos to make sure they get plenty of oil, clamping oil flow though is up to you on the hybrids but i assume not the case here.
did you replace the carbon seal on the main shaft near the turbine wheel? that is the main culprit for oil leaking where you described if it is coming from inside the turbo. could also simply be coming off the oil drain line if it isn't sealed very well. if the tailpipe isn't smoking like a train then it isn't the engine. |
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Originally Posted by RotaryEvolution
(Post 11189689)
did you replace the carbon seal on the main shaft near the turbine wheel? that is the main culprit for oil leaking where you described if it is coming from inside the turbo. could also simply be coming off the oil drain line if it isn't sealed very well. if the tailpipe isn't smoking like a train then it isn't the engine. A little bit of smoke comes from the area of the turbo but 95% comes from the tail pipe. |
I find it hard to believe that the engine might be spewing oil since it was rebuilt just a few hours ago BUT as SPOCK once said, "Once you eliminate the impossible, whatever remains, however impossible, must be true."
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What do you guys think about........ take the turbo back off, take out the guts of the CHRA including the shaft and wheels and all seals, put it back together and put it back on. Then block of the oil and water lines. Would the CHRA itself be damaged doing this?
Something simpler? How about, just remove the turbo and attached the AFM to the other side of the FMIC tubing. |
Originally Posted by 7dust
(Post 11189709)
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i would just yank the turbo off and inspect the manifold. oil in the manifold pre-turbine wheel= engine oil seal issue. oil only past the turbine wheel= faulty turbo.
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Originally Posted by RotaryEvolution
(Post 11189805)
i would just yank the turbo off and inspect the manifold. oil in the manifold pre-turbine wheel= engine oil seal issue. oil only past the turbine wheel= faulty turbo.
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Originally Posted by RotaryEvolution
(Post 11189805)
i would just yank the turbo off and inspect the manifold. oil in the manifold pre-turbine wheel= engine oil seal issue. oil only past the turbine wheel= faulty turbo.
Fired it up and............. YEA..............NO SMOKE. So, the smoke has to be coming from the turbo. But where? I sent the backing plate to GPopshop and they pressed in the one piece seal in, so that should be OK. |
I bought this turbo last month on here. I was told that it had very low mileage on it and was in perfect working order. I paid $165 for it.
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^ It's funny that you mention the seller claiming that it is a "low mileage" turbo... I love how everyone trying to sell a turbo claims that it has "low mileage".
Hmm... All of these 13BT's with 100k+ miles on them, yet the turbos have only 30k miles!? The turbo I have is a "low mileage" turbo. I wonder why I hear a ticking noise. Heh' - It works, though. |
Originally Posted by dwb87
(Post 11190013)
^ It's funny that you mention the seller claiming that it is a "low mileage" turbo... I love how everyone trying to sell a turbo claims that it has "low mileage".
Hmm... All of these 13BT's with 100k+ miles on them, yet the turbos have only 30k miles!? The turbo I have is a "low mileage" turbo. I wonder why I hear a ticking noise. Heh' - It works, though. I think it was supposed to be imported from japan or something..... yea, right. I think this guy replaced his smoking turbo and then sold it to me. |
doesn't sound like a turbo coldside issue but it is a hotside issue, mainly the carbon seal or the restrictor inside the CHRA was removed somewhere along the line allowing the turbo to see full line pressure and pushing oil out the back end.
the carbon seal may have cracked during assembly, it is rather brittle. careful when cleaning the bore for the carbon seal, if too much material is removed it will allow the ring to expand and then will not seal properly. |
Originally Posted by RotaryEvolution
(Post 11190103)
doesn't sound like a turbo coldside issue but it is a hotside issue, mainly the carbon seal or the restrictor inside the CHRA was removed somewhere along the line allowing the turbo to see full line pressure and pushing oil out the back end.
the carbon seal may have cracked during assembly, it is rather brittle. careful when cleaning the bore for the carbon seal, if too much material is removed it will allow the ring to expand and then will not seal properly. Does the thrust spring install facing up or facing down? I don't know what else to look for. |
i understand but without tearing it back apart you can't see what the possible issue is. i would focus on inspecting the turbine main shaft, the piston ring(carbon seal) and the CHRA end where the piston seats into for any pitting or wear.
you may have even gotten a faulty piston ring or one out of spec. |
Originally Posted by RotaryEvolution
(Post 11190155)
i understand but without tearing it back apart you can't see what the possible issue is. i would focus on inspecting the turbine main shaft, the piston ring(carbon seal) and the CHRA end where the piston seats into for any pitting or wear.
you may have even gotten a faulty piston ring or one out of spec. |
I took it apart again. I didn't see anything wrong so I had a couple of guys check it out. They didn't see any thing suspicious but there is a problem with the hot side because the heat shield was covered in oil. Maybe I could swap in the shaft from the original turbo but then it would need balanced again. Or maybe I should just buy another one and hope somebody else doesn't sell me their burned up junk turbo.
Advice/ideas?? |
Will an S4 turbo work on an s5?
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