Engine rebuild thread

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payydg said:
Just annoying when you're let down buy a company you paid to do a job. I'm temped just to buy a new turbo
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I wish I'd bought a new turbo instead of a reconditioned one. The first one I got was passing a lot of oil, but in to the
intercooler and so through to the engine. It wasn't creating much pressure either. They replaced it and the improvement in performance was very noticeable. This one is still passing a bit of oil though and I'm still using about 250ml of oil each week. So, I have the dilemma of buying a new turbo to see if that cures the oil loss, or attempting a home rehone of the bores. If I'd bought a new turbo I might not be in this situation. :rolleyes:
 
Al2O3 said:
I wish I'd bought a new turbo instead of a reconditioned one. The first one I got was passing a lot of oil, but in to the
intercooler and so through to the engine. It wasn't creating much pressure either. They replaced it and the improvement in performance was very noticeable. This one is still passing a bit of oil though and I'm still using about 250ml of oil each week. So, I have the dilemma of buying a new turbo to see if that cures the oil loss, or attempting a home rehone of the bores. If I'd bought a new turbo I might not be in this situation. :rolleyes:
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I thinking of just that. ITs expensive but I don't mind paying to just get things sorted. At least it was sunny whilst tinkering today
 
Al2O3 said:
That's bloody annoying :mad: It's a hell of a fail and could have been nasty.
If the oil in the sump was high enough to still show on the dipstick and with that pressure, I reckon it'll be fine.
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Thinking this through low oil level would start to manifest as low pressure when a problem? The pressure was 50-60 on start up and then dropped down to minimum 35-40 when at temp. Didn't over heat. An oil pressure surely means the pump is picking up oil and pumping it round fine?

I'm thinking about this like a human body - your BP is what matters not how much blood you have. If your BP is low then either your volume is low or the pump (heart) doesn't work.
 
payydg said:
Thinking this through low oil level would start to manifest as low pressure when a problem? The pressure was 50-60 on start up and then dropped down to minimum 35-40 when at temp. Didn't over heat. An oil pressure surely means the pump is picking up oil and pumping it round fine?

I'm thinking about this like a human body - your BP is what matters not how much blood you have. If your BP is low then either your volume is low or the pump (heart) doesn't work.
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Yes, I think it will be absolutely fine.
 
Spoke to turbo people who tried to convince me that it’s a blocked oil return pipe or raised crank pressure. Pipe is patent I checked when I put it on. If there was obstructed flow in the engine I’m assuming this would manifest as raised oil pressure? Also what does the oil return pipe from turbo drain into? Directly into the sump?
 
payydg said:
Spoke to turbo people who tried to convince me that it’s a blocked oil return pipe or raised crank pressure. Pipe is patent I checked when I put it on. If there was obstructed flow in the engine I’m assuming this would manifest as raised oil pressure? Also what does the oil return pipe from turbo drain into? Directly into the sump?
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On the 300Tdi the return just flows straight in to the sump. Should Imagine the 200Tdi does the same.
 
Al2O3 said:
On the 300Tdi the return just flows straight in to the sump. Should Imagine the 200Tdi does the same.
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It does.

payydg said:
Spoke to turbo people who tried to convince me that it’s a blocked oil return pipe or raised crank pressure. Pipe is patent I checked when I put it on. If there was obstructed flow in the engine I’m assuming this would manifest as raised oil pressure? Also what does the oil return pipe from turbo drain into? Directly into the sump?
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I would expect 50 to 60psi on start up as the oil is thicker and has settled in the engine and bearing galleries, 35+ is fine, bear in mind that the pressure switch doesn't come on until pressure is lower than 12psi.
 
dieseldog69 said:
It does.



I would expect 50 to 60psi on start up as the oil is thicker and has settled in the engine and bearing galleries, 35+ is fine, bear in mind that the pressure switch doesn't come on until pressure is lower than 12psi.
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Thats exactly what it's at. Thanks.
 
payydg said:
So the turbo is ****ing oil out the back and into the exhaust. Very disappointing as I paid a fair wack to have it rebuilt. I can only assume the oil seals have failed immediately. Also meant that the oil ran low (bottom of the dip stick) for a bit not by much and the pressure was decent throughout. If the oil level is a bit low but the oil pressure is adequate (lowest was 35 - 40psi) I'm assuming that isn't going to have done any real harm to the engine?

Lucky to have not failed into the intake and run away.
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if it hasnt dropped below 35 psi you shouldnt have any worries,thats a more than adequate working pressure, turbo drains directly in to crank case ,ive know plastic bungs left in turbos so stopping return and so forcing oil past the seals and return pipes that have got crimped causing the same, but if returns alright it is only a turbo fault ,increased crank case pressure etc etc are just poor excuses
 
jamesmartin said:
if it hasnt dropped below 35 psi you shouldnt have any worries,thats a more than adequate working pressure, turbo drains directly in to crank case ,ive know plastic bungs left in turbos so stopping return and so forcing oil past the seals and return pipes that have got crimped causing the same, but if returns alright it is only a turbo fault ,increased crank case pressure etc etc are just poor excuses
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Thanks James. I’ll double check I haven’t done something stupid like left the bung in the bottom of the turbo! Just out of interest what’s the minimum oil pressure before it’s a problem? I.e. when to shut down before issues as the light only comes on a very low pressure.
 
So took it for its maiden voyage this eve. Running well. Good on power. Very smokey on high revs esp when going up hill. Think it's running a bit rich? Doesn't smoke at all at idle. Confounding factor is I have a exhaust full of oil from previous turbo issue but it defo smokey exhaust when going for power. Any suggestions?
 
jamesmartin said:
run it ,oil in exhaust will clear once its burnt all the oil trapped inside
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I have a feeling it’s not the oil in the exhaust as it pours smoke when high revs up hill. If it’s not the oil in the exhaust what would you suggest checking next? Valve clearances are fine, new refurbed pump, new turbo. Timing is spot on...
 
payydg said:
I have a feeling it’s not the oil in the exhaust as it pours smoke when high revs up hill. If it’s not the oil in the exhaust what would you suggest checking next? Valve clearances are fine, new refurbed pump, new turbo. Timing is spot on...
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what kind of smoke ,its going to burn the oil when exhaust gasses are at their highest temp ie flat out uphill
 
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