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I wonder if any members can advise me on a virtually none performance problem.
The engine of my motor home is a re-conditioned Mercedes 307D (T1 OM616.934 with a 4 speed box. No turbo) which has astoundingly poor performance. (I think it's a re-con engine, it's painted blue)
It's best (foot to the floor!) speed during acceleration is about 35mph. Given time it will achieve 45 mph and has never bettered 60mph downhill. During a recent trip to Devon I had to resort to first gear to climb a couple of not very steep hills. Any type of an incline means a shift down to third and then probably second.
Having the weight checked at my local weighbridge before going to Devon, all up, including myself, wife and our Jack Russell it was 3005kg (Max 3500kg). So I don't think overloading is the problem.
My only observations are that the throttle linkage appears to be be loose but I don't know if that is normal? and I have read, on an American forum, that there is a fuel return valve which pumps excess fuel back to the tank. It appears that the spring compresses after time and reduces the amount of fuel supplied to the injectors. The fuel consumption has been reasonable so I wonder if the engine is being starved of diesel? I don't know if the re-con engine had the original fuel return valve re-fitted. Other than that I don't have a clue what the cause of problem may be.
I would be extremely grateful if anyone out there could help. Being overtaken by cyclists is not funny!
All that it takes for evil to succeed is that good men do nothing.
Hi had one of these years ago. good van but only realy good for about sixty would do seventy but the engine would scream it done all the usual things crawl up hills etc but wasnt as bad as yours sounds sorry cant help any further sounds like you need a good diesel mec all the best jeffro
It would help people make suggestions of suitable people to ask if we knew where you are located; it sounds as if the engine may not be set up properly but it would take a mechanic plus perhaps a computerwith the appropriate diagnostic tools to check what is happening.
Spcialist mechanics would be able to give advice I am sure, a lot of owners know who they trust in their area.
I had similar symptoms to these an a car and it turned out to be valve timing. It happened after a reconditioned engine was fitted when the mechanic lined up the timing marks incorrectly.
Fuel of course is another possibility or anyhing to do with engine management. This problem is best solved by a garage with appropriate diagnostic equipment.
Excuse my ignorance but I am going to assume this is a turbo diesel engine.
I had a similar problem on Claire's BMW 530D which flat out was only just about getting to 70mph. Took it to the garage and they knew exactly what the problem was. The air filter on the turbo was blocked. Happens all the time they said!
I'm not technical, but I think it would be difficult to provide any definitive answers without knowing the age of the vehicle, age and mileage of current engine, who reconditioned it, and whether it was done properly
I speak from experience of building a few engines on bangers when I was a student, and from memory never made a good 'un
My experience of non turbo Mercedes is mostly with PSV, and they would flat out at about 60
Autos were a bit more sprightly than manuals, which needed the delay between changes that you would expect from larger vehicles
That said, they were 5 speed with 1st as a 'crawler'
Hills were not much of a problem, but the lack of a turbo will surely impose on performance
Sounds like you need to get a diesel mechanic to run some tests, but even so I wouldn't expect it to fly up hills
Hope you get it sorted though; I know how frustrating it can be
Otto
It sounds to me as if the pump timing needs advancing (I assume it's a mechanical pump). This can be quite easy to do on some engines, dunno about yours but I've done it before on land rovers. Basically you just release the pump and turn it slightly as you would with the distributor on a petrol engine. Mark the start point so you can return it to that point if required.
______________________________________________________________ If you lend someone £20 and never see that person again, it was probably well worth it.
hi i would start with the cheapest options first!! This was never going to be a stunning performance power unit even from new, but i would start by first check the hand brake/rear linings are not binding it was known for the handbrake linkage to seized and cause binding of the linings to the drum, its a simple check and a bit of wd 40!! Is the air filter clean, usually if this is blocked you would get some black smoke but not always, try removing it temporally and a quick run down the road will tell. check the vent to the fuel tank on this model it does not have a pressurised tank like the newer ones. If air cannot get in fuel can't get out. The next step would be to take it to a diesel fuel specialist as they would have the test equipment to check it properly, if the timing belt has been fitted incorrectly they will be able to tell because the spill timing will be out, and they will be able to check the fuel metering valve. good luck hope this helps.
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