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Old 16 May 2008, 11:28   #1
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Mercruiser 1.7 Diesel 120hp

I have a diesel Mercruiser 1.7 outdrive unit which when out of gear is attaining maximum revs, but when in gear under load is only achieving around 1200/1500rpm.

The leg has been checked and is fine.

Has anyone had a similar experience?
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Old 16 May 2008, 15:28   #2
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I have a diesel Mercruiser 1.7 outdrive unit which when out of gear is attaining maximum revs, but when in gear under load is only achieving around 1200/1500rpm.

The leg has been checked and is fine.

Has anyone had a similar experience?
No but I wouldn't be surprised if it was related to the turbo - is it making any unusual noises - if the wastegate gets stuck they can blow a whole in a piston which would have the same effect, but that would cause lots of smoke as well!
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When a boat looks that good who needs tubes!!!
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Old 18 July 2008, 13:29   #3
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Merc 1.7 DTI

I've just had my turbo replaced yesterday due to similar symptoms, the waste gate was jamming and it turns out that the bearings inside the turbo were knackered. Today I blew something up, possibly a hole in a piston or scoured a groove in the casing. Either way the sump pressurized and blew oil out of the dip stick, lots of white smoke!!. Is it a re-engine job or does anyone know if it's repairable? The engine is 5 yrs old but only 130hrs used.

Rather dissappointingly everyone i've mentioned it to says that this happens to all of these engines and I'm lucky to have got 5 years out of it!!
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Old 08 August 2008, 18:21   #4
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This evening i blow up my 1.7 Mercruiser DTI engine!
270 hours, from 2004.

Cruising at 3100 RPM suddenly the motor stopped and there was a lot of smoke behind the boot. At a safe place i checked oil level. It was very high, proberly added with gasoil.
Is this typical for a broken piston (hole)?

After some reading it looks like this happens more with this engine. What do do now?
Will Cummins/Mercruiser give any warranty on this? They should in my opinion!

Tomorrow we will take a closer look. to be continued..
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Old 09 August 2008, 06:04   #5
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Checked the motor again this morning, but there is no gasoil in the carter. There is nearly no oil rest in the carter!? Proberly lost oil through a hole in a piston?

This week i am going to disassemble the motor and then find out what the damage is.
A lot of work, a lot of money.... shit happens.
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Old 12 August 2008, 15:40   #6
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There is a hole in the piston
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Old 13 August 2008, 04:13   #7
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If it number 3 piston, then it is an incorrect spray pattern from the injector. I dont know you will get on with your warranty, you might al least get some parts out of them. It is a known problem.

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Old 13 August 2008, 07:16   #8
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ok, but their seems also a problem with the waste gate of the turbo.
I hop i get a new engine, repairing is a hell of a job.
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Old 13 August 2008, 09:00   #9
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ok, but their seems also a problem with the waste gate of the turbo.
I hop i get a new engine, repairing is a hell of a job.
Yes, that is the other known issue.
More info here and turbo pictures.

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Old 13 August 2008, 11:37   #10
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It's said by the dealer that the 1.7 DTI is maybe not available anymore.
does anyone has information about the 'next' model. Is it a 2.0TDI ?
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