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Old 23 July 2009, 02:25   #11
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Cookee's Avatar
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Here you go:
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 24 July 2009, 06:10   #12
Country: UK - England
Boat name: sorry-hate boats
Length: no boat
Engine: gas/diesel inboards
Join Date: Jun 2009
Posts: 5
Originally Posted by Stu99 View Post

One of the pistons on my mercruiser/cummins 120 has just cracked. Does anyone have any experience if the manufacturer are willinging to provide the new piston parts for free?
Hi Stu

Talk to Cummis concerning this, will depend on how old your engine is, but they have been replacing engines because of this failure, don't let them tell you otherwise.
Whats your engine serial number?

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Old 13 February 2013, 05:04   #13
rdk12's Avatar
Country: UK - England
Town: Christchurch
Boat name: Grumpy
Make: Parker
Length: 6m +
Engine: Diesel
Join Date: Apr 2010
Posts: 3
1.7 mercruiser serial number

RE 1.7 DTI mine has an 88 serial number.
I have recently bought a rib with this 120hp engine, we contacted Mercruiser to confirm the serial number mentioned in this post. I have today received an email from them saying that my engine serial number 88110661 has the redesigned oil nozzle spray pattern and revised pistons. They do say that the turbo over boost remains an issue and it’s been suggested that a boost gauge could assist with early warning, should the actuator arm start to meet resistance (seized waste gate) creating over boost.

This post shows someone’s rather rusty waste gate.
pictures of faulty mercruiser turbo
Boat design is important, you wouldn’t want salt water coming in to the engine bay, if you accidentally reversed to fast...

The ribnet web site has been a great reference tool for me and I have deduced that as long as the engine is not overproped, the waste gate has an eye kept on it, it’s well maintained, it’s should be good for the recreational use it was intended for. My engine has been well maintained and benefits from a recently replacement turbo and assembly. I hope my post can assist others with their quest for knowledge. If I put my figures round the actuator arm that opens and closes the waste gate. I can feel it move when the engine is running under load and the throttle lever is moved back and forward gently. I’ll start a new tread with how I fitted a boost gauge and the results later.
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Old 14 February 2013, 14:42   #14
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
Horrible engines!!! They dont make them anymore, we have one in the workshop at the minute, just had a rebuild. Turbo waste gasket seized, and hole in the piston. Its been nothing but trouble since the rebuild!

Black Dog Marine
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