300Tdi Question

Evening,

Does anyone know if the 300tdi runs a bit laboured in cold weather? I mean if cold air is being sucked in?

Cheers,

Mo

Not sure I understand your question. If you mean does the engine run rougher when cold then this can happen I but should smooth out when warm.

The engine shouldn't feel underpowered when cold it should feel more powerful as cold air is denser so more oxygen more bang.

Not sure if that's what you're asking?

Mine certainly doesn't and I reckon it gets a fair bit colder up here than it does down your way.

Ok, it was a long shot. I've just had a new old engine fitted and it was ok until yesterday when I noticed it feeling a bit rough. It still pulls ok and there's no smoke or anything, it just don't feel right? fuel filter?

I'd start with giving it a decent service including all filters then if that doesn't help it look at the lift pump but it certainly is not cold enough to bother a 300tdi, mine starts straight away without glow plugs no matter if it's hot or cold

Thanks Marmaduke. Starting is not a problem, just general driving feel. It might just be me

Marmaduke said:

I'd start with giving it a decent service including all filters then if that doesn't help it look at the lift pump but it certainly is not cold enough to bother a 300tdi, mine starts straight away without glow plugs no matter if it's hot or cold

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+1 - lift pumps can fail quite slowly ( or instantly ). its the usual suspect if the filter and sedimenter are all good. then perhaps look for air getting into the system...

Disco1BFG said:

+1 - lift pumps can fail quite slowly ( or instantly ). its the usual suspect if the filter and sedimenter are all good. then perhaps look for air getting into the system...

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No sedimenter on a tratter, they probably knew that farmers would be running theirs on crap fuel and would be for ever cleaning it out

Marmaduke said:

No sedimenter on a tratter, they probably knew that farmers would be running theirs on crap fuel and would be for ever cleaning it out

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Not sure why that should be? Farmers just use the same fuel as anyone else for road use.
Red is only used in a very few landies, as it limits to 7 mile radius of the base, and you would need to register as an ag vehicle.
In any case, most farmers will be very careful about red diesel storage, tractor engines are very expensive now, and do get damaged by poor quality fuel.

I think SW did have sedimenters, at least the earlier ones. I would guess it wasnt fitted to hard tops and truck cab as an build economy measure, they were considered as utility vehicles at that time.

Update: I've just noticed fuel dripping out of the back of the fuel pump. Can't tell if it's from one of the four pipes or a small screw below the pipes. Could this be a bleed screw? I'm out and about at the moment with no tools (I know, I know!). Could this be a possible cause of the "roughness"?

Yes, if it's letting fuel out there's a chance that it's letting air in, the four injector pipes are 17mm, self sealing and a pain in the arris to get at

Well, had the pump fixed and what a difference! £150 well spent!

mojo247 said:

Well, had the pump fixed and what a difference! £150 well spent!

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Cool, glad its sorted.

Sorry All, I thought I'd mentioned previously that the fuel pump leak was in fact coming from the distributor head. A diesel fuel pump specialist came by and replaced the o ring, which was nice and flat, and that has done the job.

It's also improved the overall performance and only cost me £150!