Mercruiser 1.7 Diesel 120hp

Ashton · 16 May 2008, 16:28

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?

Cookee · 16 May 2008, 20:28

Quote:

Originally Posted by Ashton

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!

oy.dopey · 18 July 2008, 18:29

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!!

hybride · 08 August 2008, 23:21

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..

hybride · 09 August 2008, 11:04

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.

hybride · 12 August 2008, 20:40

There is a hole in the piston

nik · 13 August 2008, 09:13

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.

Nick.

hybride · 13 August 2008, 12:16

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.

nik · 13 August 2008, 14:00

Quote:

Originally Posted by hybride

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.

Nick.

hybride · 13 August 2008, 16:37

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 ?