marinised transit engines

[cafebloke]

My boat has two 2.5di transit engines, a little noisey but very economical...
I rarely go above 2500 revs but I have noticed that if I have a moment of madness and push the levers all the way forward one of the engines revs to 4000rpm and one only reaches about 3200 rpm..

Any of you mechanically minded people out there know what might cause this ??

Ta

Chris

 

[Divemaster1]

Not enough info...

.........if I have a moment of madness and push the levers all the way forward one of the engines revs to 4000rpm and one only reaches about 3200 rpm..

Need more info... boat, drives, gearing props etc...

Could be simple like throttle lever not adjusted to give full fuel, fuel filters/supply blocked,air limitations (air filter), prop size wrong, turbos, etc...

Basically ..

Any smoke (black or white)?
Service history ?
Last Filter changes ?

etc...

 

[cafebloke]

Hi Alf,
thanks for the reply... I am not mechanically minded but will have a go at answering...
Boat is a birchwood 27 countess.
2 x ford transit 2.5di marinised.
2 x volvo gearbox 1.93:1 ( MS3 )
both engines serviced three months ago
new oil & fuel filters.
no smoke, both start easy,
air filters were removed by whoever fitted the engines( before my time)
as there was insufficient space under floor.
a fine metal gauze has been fitted to keep crud out of air intakes.
no previous problems with engine speeds, this has only happened in past couple of weeks.. Not a major headache as mentioned, because the engine hardly ever get pushed that far..

 

[tinkicker0]

The transit 2.5DI motor had silly Bosch clamp on fuel filters that were a bit fiddly. If they have been incorrectly fitted, they can start to leak after the fact.

Other areas on these motors to take a look at are the lift pump and the injection pump cam ring which breaks up with monotonous regularity.

Pull the stop solenoid and see if it is full of metal filings. If it is, time to rebuild the pump.

It is not possible to correctly diagnose such things accurately on a forum, you need to be there and have the requisite test equipment. Too many variables.

 

[PCUK]

Rubbish on one of the props?

 

[cafebloke]

Thanks for the various advice,, although most of what tinkicker said went straight over my head...

next time I get to the boat I will jump in the water and check the props
anything technical such as injection pump cam rings are definitely the domain of a mechanic and not me...

thanks again

 

[Assassin]

In addition to the above posts, they are also prone to temperature and either No 3 or 4 injectors deteriorating.