KAD 42 - Speed Problem - Please Help.

[Supercose]

Dear All,

I have 1995 Wellcraft Martinique 27 with single diesel Volvo Penta KAD 42.

Normally boat sails with 23-26 knots gps speed with 3000 - 3300 rpm with maximum speed of 33 knots at 3500 rpm.

Last week performance of the boat was very good but this week I faced with a strange problem.

At marina, in neutral (N) gear, when I give throttle, engine goes up to 3800 rpm which is quite good.

However, at the sailing, when I give full throttle engine stucks at 2000 rpm with 8.9 knots gps speed and never go more.

Also there is no any white or black smoke.

I have removed turbo, compressor, intercoller, injectors and cleaned them and connect again however nothing changed.

I checked the quality of the diesel also it was good.

I checked cable/wire of the throtte arm and it was also good and normal position.

What could be the problem ?

Where do I have to look and check ?

Waiting your helps and recommendations.

Kind Regards

 

[Lemanix]

KAD 42 Speed problem

I have a twin KAD42 230hp and have a similar problem.
one engine full trottle revs 3200 rpm and the other revs 2500 rpm and after a while the alarm goes on.
I changes all diesel filters, air cleaners filters and water impeller but nothing changed.
Was just about to put out the diesel nozzles of the engine that is only reaching the 2600 rpm
Now just seing your message and not sure what to do.

Regards

Lemanix

 

[tribblehunter]

Hi Supercose.

Does the supercharger operate? If it is not kicking in the engine may not have enough 'oomph' to get you on the plane.

As there is no boost pressure created, the injection pump smoke limiter may be holding back the pump, which is why there is no black smoke.