Identifying turbo faults before buying

Submitted: Sunday, Apr 10, 2005 at 13:52
ThreadID: 21922 Views:2099 Replies:3 FollowUps:0
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After recent discussion on the benefits of a Turbo over Normally Aspirated diesel
80 series - I am now leaning towards the turbo.

I am under the impression that a turbo will appear to work fine until it gives up and then things will suddenly go badly wrong (heavy smoke due to over-rich mixture) or worse - a broken rotor may spit metal into the cylinder.

Could the wise sages of the Forum offer any tips on what to look for when buying a 2nd hand TD?

Are there any noises to listen for, smoke at the wrong times, excessive lag etc that may hint at a worn/failing turbo?

Approx. how much does it cost to get a broken unit swapped for a reconditioned unit?

Many thanks, Rob.

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Reply By: Richard Kovac - Sunday, Apr 10, 2005 at 15:23

Sunday, Apr 10, 2005 at 15:23
Rob
Why not talk to a Turbo dealer and ask them how much it will cost?
If you want to put trust in the Turbo get it overhauled after you buy the vehicle
Look for oil in the exhaust pipe after the turbo, take the air inlet hose off and check for end float, look in the air outlet for signs of oil or dirt
E-mail them Denco Diesel and Turbo
They should be able to help or try someone in your home state

Richard
AnswerID: 106001

Reply By: Member - Jeff M (WA) - Sunday, Apr 10, 2005 at 22:30

Sunday, Apr 10, 2005 at 22:30
With most turbos you can access them quite easily by just removing the rubber intake hose that goes from the air box into the turbo. You can then actually put your hand in the turbo and see if there's any play and work out if the bearings are stuffed or not.
Noises, there should'nt be much. If there is a snorkel on the vehicle you may here some whistling comming from there which is ok, but you don't want any bearing whining kinds of noises. A worn turbo can even sound as harmelss as a belt slipping. If there are any unsual noises, eliminte them, don't just think, oh that's just an idler pully on the air con, make sure you solve it and make sure the noise dissapears.
When you boost the turbo (accelerate) you should'nt here much from the turbo, a small whistle is ok, but not too much.

AnswerID: 106060

Reply By: Rob - Monday, Apr 11, 2005 at 13:46

Monday, Apr 11, 2005 at 13:46
Thanks for the input everyone. Very useful info.

Rob
AnswerID: 106145

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