Forum engine sages - Mercruiser 250Hp DTronic?

they were.

at the same time you could buy:

200hp was direct mechanical injection, rated for professional use
220hp was indirect mechanical injection, rated for pleasure duty
250hp was electronic injection, i think direct, presumably pleasure duty also.

all basically the same block as far as I know.
 
Brilliant big and simple(no not you) /forums/images/graemlins/laugh.gif |Parts are for nothing almost if you shop around
Its raw water cooled and thats the biggest problem
With your contacts you cannot go wrong with that engine
Not too sure of mercruiser legs though

cheers Joe
 
Its an Italian VM Motori engine, ive got mixed opinions on the ones ive rebuilt, mainly to do with the separate heads, eg if you have one skimmed then you have to have them all done its the way they are held down for that reason, then of course you get charged for each one instead of one long head.

Ive seen a couple self distruct in Broom 36 models too as you have to run em nearly flat out to plane.

They also soot the stern up badly, and yet there indirect injection suposedly smoke free, I think not.

I personally think the volvo 41/42 series is a better engine.

The early BMW versions overheated badly and required an additional oil cooler.
 
[ QUOTE ]
Its an Italian VM Motori engine, ive got mixed opinions on the ones ive rebuilt, mainly to do with the separate heads, eg if you have one skimmed then you have to have them all done its the way they are held down for that reason, then of course you get charged for each one instead of one long head.

Ive seen a couple self distruct in Broom 36 models too as you have to run em nearly flat out to plane.

They also soot the stern up badly, and yet there indirect injection suposedly smoke free, I think not.

I personally think the volvo 41/42 series is a better engine.

The early BMW versions overheated badly and required an additional oil cooler.

[/ QUOTE ]

My mate has a 2006 Bayliner 288 running this engine he cruises at 18k and flat out approx 29k we cruise a lot together me alongside in my 2858 with 315 Yanmar and I have to say his produces less soot on the rear than mine and mine does not produce that much!
 
I tend to go with Paul, mixed views.

Yes the indirect injection 250 DTronic was out in 1999. Possible due to poor support from the distributor at the time small problems could become a nightmare. If you have a dealer on hand who knows the engine and has a RINDA diagnostic tool it is a great help.

Because it is not a true electronic engine, just a Bosch VP 37, dumb mechanical rotary pump with a smart electronic governor and a needle lift sensor on #1 injector can be troublesome. Quick and easy test is to check if engine reaches high idle when warm, if engine has faulty needle lift sensor engine rpm is limited to 15/1800 rpm.

The biggest problem I have come across causing low power complaints particularly with outdrive units is the design of the Mercruiser exhaust riser. It is marginal and easily allows sea water to get back into the watercooled snail of the KKK turbo.

In my book KKK turbochargers are junk. I know Volvo people may not agree, however the iron of the exhaust snail is poor quality and turns to putty with the slightest of water ingress. Neither V.M. or KKK have a turbo exchange programme for for the turbo which has any number of super sessions. The result is the poor old boater can be left with an outright buy at £2500 retail, plus VAT.

I have worked with an excellent turbo re conditioner and we made a jig to machine the corroded iron casing to accept a 316 stainless sleeve TIG welded in place which is then machined to the original tolerance. Costs less than half as much as a new turbo, and is a more robust fix as it does not melt in the presence of hot salt spray.

Please do not take that a complete downer on the V.M. I only get to see anything when it is in deep trouble. There are many out there doing a great job. The engine is also silky smooth and decent on fuel even more so in the latest direct injection common rail versions.

Lancing Marine is a good source of V.M. parts at sensible prices.
 
I have a pair of big ones.
they are 2004 300 HPs

Basically the same 4.2L engine.

Fantastic , smoke free even on cold winter start.
Tender and stern stays clean even after 500 nm
Incredibly smooth
economic, (if there is such a word for a boat).

And don't forget the best bit to help with a long life and cheap service

no tappets to adjust

Parts available from

Cummins agents
Cummins-Mercruiser
Mercruiser
even Mercury outboard dealer can get next day delivery on many parts.

Never missed a beat and never any sign of overheat....touch wood.


I cant understand why people put up with the Volvo D series when these are available /forums/images/graemlins/confused.gif
 
For later engines like yours Cummins Diesel at Hamble do a far better job than Barrus ever did. However for pre-CMD ratings matters are not brilliant.

Barrus were unhelpful when sole distributors, once they had been served with notice that they were losing the CMD franchise became totally bloody minded, similar situation in the U.S, which is probably one reason why the engines are not more popular.
 
Hey guys nice to meet you all I am after a bit of advise I really hope someone has a idea
I have a VM Motori MD 706LH it's a good running engine and does the correct revs
However it is hard to start I can give it a small squirt of aero start (a ether base starting spray) and it will start right away
It also used to have a stalling problem after long run but I moved the electronic throttle control lever one notch and that fixed it.
It seems strange to me that it runs so well but is hard to start if I hold the throttle open full and turn it over after quite a few cranks it will start
I have my suspicions but I lie some ther thoughts
My thoughts are a possible injector pump problem
The fuel pump is in good condition and the filters are changed regularly
Any idea guys?..
Also please be aware I am in cambodia so it's imposable for me to find anyone to look this over or connect a reader to it...
I also have no codes on the dash lights

Thanks guys
Gary
 
garylind said:
Hey guys nice to meet you all I am after a bit of advise I really hope someone has a idea
I have a VM Motori MD 706LH it's a good running engine and does the correct revs
However it is hard to start I can give it a small squirt of aero start (a ether base starting spray) and it will start right away
It also used to have a stalling problem after long run but I moved the electronic throttle control lever one notch and that fixed it.
It seems strange to me that it runs so well but is hard to start if I hold the throttle open full and turn it over after quite a few cranks it will start
I have my suspicions but I lie some ther thoughts
My thoughts are a possible injector pump problem
The fuel pump is in good condition and the filters are changed regularly
Any idea guys?..
Also please be aware I am in cambodia so it's imposable for me to find anyone to look this over or connect a reader to it...
I also have no codes on the dash lights

Thanks guys
Gary
Click to expand...

Have you checked he glow plugs with a multi meter for continuity or removed them and tested on a battery to see if they glow?
 
Latestarter1 said:
I tend to go with Paul, mixed views.

Yes the indirect injection 250 DTronic was out in 1999. Possible due to poor support from the distributor at the time small problems could become a nightmare. If you have a dealer on hand who knows the engine and has a RINDA diagnostic tool it is a great help.

Because it is not a true electronic engine, just a Bosch VP 37, dumb mechanical rotary pump with a smart electronic governor and a needle lift sensor on #1 injector can be troublesome. Quick and easy test is to check if engine reaches high idle when warm, if engine has faulty needle lift sensor engine rpm is limited to 15/1800 rpm.

The biggest problem I have come across causing low power complaints particularly with outdrive units is the design of the Mercruiser exhaust riser. It is marginal and easily allows sea water to get back into the watercooled snail of the KKK turbo.

In my book KKK turbochargers are junk. I know Volvo people may not agree, however the iron of the exhaust snail is poor quality and turns to putty with the slightest of water ingress. Neither V.M. or KKK have a turbo exchange programme for for the turbo which has any number of super sessions. The result is the poor old boater can be left with an outright buy at £2500 retail, plus VAT.

I have worked with an excellent turbo re conditioner and we made a jig to machine the corroded iron casing to accept a 316 stainless sleeve TIG welded in place which is then machined to the original tolerance. Costs less than half as much as a new turbo, and is a more robust fix as it does not melt in the presence of hot salt spray.

Please do not take that a complete downer on the V.M. I only get to see anything when it is in deep trouble. There are many out there doing a great job. The engine is also silky smooth and decent on fuel even more so in the latest direct injection common rail versions.

Lancing Marine is a good source of V.M. parts at sensible prices.
Click to expand...

Very interested in your turbo fix.

Have a very poorly turbo from a Merc 4.2l 220 with a crack on the inside of the exhaust out part of the turbo(the dry bit).

Is this the sort of repair your talking about?
 
Thanks for the reply but mine doesn't have glow plugs...
now that coud be that because of the country I'm in (cambodia) its never cold
I've owned this boat for around 3 years now and from what I can see it never had glows

Thanks again
 
volvopaul said:
Have you checked he glow plugs with a multi meter for continuity or removed them and tested on a battery to see if they glow?
Click to expand...

Thanks for the reply but mine doesn't have glow plugs...
now that coud be that because of the country I'm in (cambodia) its never cold
I've owned this boat for around 3 years now and from what I can see it never had glows

Thanks again
 
Latestarter1 said:
I tend to go with Paul, mixed views.

Yes the indirect injection 250 DTronic was out in 1999. Possible due to poor support from the distributor at the time small problems could become a nightmare. If you have a dealer on hand who knows the engine and has a RINDA diagnostic tool it is a great help.
Click to expand...

Hi, the D-tronics were direct injection. They have a different head design, and don't need glow plugs. At least not in the summer time.
Very easy starting and low smoke engines.
 
I've known several of these with difficult starting and every one was down on compression &the cure was a strip &re ring ive had several in my own boats and repaired many others as has been said before they are good on fuel completely smoke free and instant starting
the pump doesn't listen to the throttle pot untill the engine starts so opening the throttle does nothing unlike a mech pumped engine which would pump in extra fuel & compensate for the reduced compression
my first step would be a compression check
ken
 
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