pictures of faulty mercruiser turbo

nik · 22 May 2007, 16:34

Hello all,
I have finally got my boat back, saga here. And I have had a look at the old turbo to see what exactly went wrong. Pictures below. I have arrowed the siezed part

alt · 22 May 2007, 16:46

Just as I suspected, seized wastegate. What year is your engine? That exhaust looks damn well rusted! Mine was a 2004 with 125hours on it, and when I sold it a few months ago all that area was rust free. Then again, im on fresh water. anyhow, great pictures, keep us updated, I have great interest in this subject

nik · 22 May 2007, 16:54

The engine was replaced in 2005, original had the holed piston syndrome. Incidentally, I saw one of these pistons, it looked as if someone had drilled a small hole in it.
Replaced turbo had about 150 hours of use, and the lever that siezes, when it is new, you can operate with your little finger

alt · 22 May 2007, 17:10

You need to buy some Milk Mouse and lube that joint before/after every journey - Might seem a bit OTT but it will giv eyou some re-assurance

jwalker · 23 May 2007, 22:12

Nik, I think I'd be looking at an engine housing which keeps the salt water out.

nik · 24 May 2007, 08:28

Quote:

Nik, I think I'd be looking at an engine housing which keeps the salt water out

I am not aware of saltwater getting in. Overall, the ride is pretty dry. The corroded part is wrapped in that silver heat resisting shroud. Also, I would of thought that the turbo is so hot that any water getting on it would evaporate immediately.
I can only assume that it is a combination of heat, (look at exhaust manifolds), and damp air.

Nick

PS. If you look at the pictures, the exhaust side is corroded, but the boost side side is near pristine

jwalker · 24 May 2007, 12:30

Quote:

Originally Posted by nik

If you look at the pictures, the exhaust side is corroded, but the boost side side is near pristine

Yeh, I noticed that but the rust appears excessive. Is the boost side also cast iron?

In one of the pics it looks as though the cast iron is split over the turbine housing but I guess it could be an illusion and just a sharp moulding line.

It appears that under the heat shroud is a wet place because parts of the shroud have adhered to the cast iron, so the rust must have grown under and into the fabric of the shroud.

kevin1123 · 03 August 2010, 20:13

hi
am i right in thinking this is the turbo on a mercruise 120 dti ?.
I have this engine on my boat and have read about the problems this engine has , with the waste gate issue is it just the case of taking off the heat shroud and wiggling the bar and shaft that works the wastegate
thanks