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Old 22 August 2012, 15:26   #11
dnv
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Country: Germany
Town: Hamburg
Boat name: Der Delphin
Make: Parker
Length: 6m +
Engine: Inboard Diesel 120HP
Join Date: Dec 2008
Posts: 168
Quote:
Originally Posted by nik
two different issues.
Holey piston, No 3 piston, incorrect spray pattern from injector.
Wastegate, stuck closed, overboosting, stuck open, (me) no boost and long slow drive home.
Heard about the wastegate issue.
Any known preventive maintenance?
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Old 22 August 2012, 15:34   #12
nik
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Country: UK - England
Town: east cowes
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Quote:
Originally Posted by dnv View Post
Heard about the wastegate issue.
Any known preventive maintenance?
I happened to me once.
If I still had the boat and it happened again, I would either fit a boost gauge to indicate overboosting, or shut it entirely and look for an alternative to fit, like a poppet valve.
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Old 22 August 2012, 15:54   #13
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Country: UK - England
Town: Southampton
Boat name: Seahawk 3
Make: Parker 6.3
Length: 6m +
Engine: 1.7 Mercruiser
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Posts: 39
I also have this engine in my Parker and have experienced this problem first hand. Infact its thanks to this forum that I spotted the siezed waste gate, which resulted in having to replace the turbo. Every now and then I get my brother to put his hand round the back of the engine on the push rod attached to the waste gate whilst I throttle up just to check its moving free and easy. This is obviously not a good idea when the engine is hot or in a lumpy sea. The best way to make to stay on top of it is to fit a boost gauge - I just haven't gotten round to it yet . One of the machanics at Mercruiser recommended spraying fogging oil in to the aircleaner at the end of the season which should lubricate the wastegate. You can't really lubricate from the outside because of the fire blanket which covers it all.

Apart from this, its been a great engine (touch wood) and I've heard of these engines doing 4000 hours +. I think the early ones with the faulty spray pattern gave them a slighly bad rep. They just need a bit of TLC
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Old 23 August 2012, 06:41   #14
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Country: UK - Scotland
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Boat name: snagglepuss
Make: Shetland
Length: 6m +
Engine: 90 hp Outboard
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Posts: 562
Mates boat: Wastegate stuck open, new turbo was fitted and 3 weeks of swearing and no boating whilst I was enjoying myself.

Note to self: buzzing around your mates who have dodgy mercruiser diesel engines who are limping home is only funny for me.
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Old 23 August 2012, 17:52   #15
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Make: reiver 3.8/regal3760
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Engine: 40hp 2st 2x6lp 315
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no one mentioned the heat exchangers and intercoolers that rot away & the camshafts that can twist out of sync because they are not one piece items!!
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Old 23 August 2012, 18:09   #16
nik
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Quote:
Originally Posted by beamishken View Post
no one mentioned the heat exchangers and intercoolers that rot away & the camshafts that can twist out of sync because they are not one piece items!!
Really?
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