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Old 06 May 2009, 18:13   #1
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Country: UK - Scotland
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Boat name: Lewis Diver
Make: Humber
Length: 6m +
Engine: Inboard diesel 1.7 D
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Holed Piston 1.7DTi mercruiser

Hi All
I'm a new member with a problem, I have read some of the old posts on this subject and like the suggestion I checked and found a small hole in No.2 piston and a seized waste gate on the turbo. The rest of the stripped down engine is spotless. The engine has only done 350hrs. If I get a new turbo and fix the piston is there anyway of stopping it happening again. A good place to find reasonable price for spares would also help. I'm in Scotland UK.
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Old 07 May 2009, 03:36   #2
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It's quite common - lots of advice here: http://groups.yahoo.com/group/cummin...ser_120hp_DTI/
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 07 May 2009, 04:36   #3
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Quote:
Originally Posted by MR.H View Post
Hi All
I'm a new member with a problem, I have read some of the old posts on this subject and like the suggestion I checked and found a small hole in No.2 piston and a seized waste gate on the turbo. The rest of the stripped down engine is spotless. The engine has only done 350hrs. If I get a new turbo and fix the piston is there anyway of stopping it happening again. A good place to find reasonable price for spares would also help. I'm in Scotland UK.
Fortunately for you its very easy to stop happening again!!
when you have replaced the piston, and freed off the wastegate/replaced turbo or what ever, put a small tee piece in the wastegate actuator pipework, run it up to the console and fit a 0-30psi pressure gauge and watch the boost pressure, if it sticks shut you will get high boost pressure and can throttle back before it melts again if you want it to be idiot proof then you can fit a small adjustable pressure switch and connect it to
a LOUD alarm. it would even be possible to fit a latching relay to a dump valve so if it overboosts it reverts to running as a non turbo until its reset.
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