Thread: 2.8 tgv diesel (big 300tdi ) power loss any ideas?

I would suggest to check the cam timing. If that is correct, then check the timing of the fuel pump.

Aaron

I suppose the question needs to be asked, how many km on the timing belt ?

Originally Posted by rick130

I suppose the question needs to be asked, how many km on the timing belt ?

New belt went in when the engine was swapped, done about 50k since, so it's not new but I would like to think they last longer than that, if I'm wrong I am happy to be told.

So I have checked with Google, would it be correct to say that the injector pump timing can only be altered by adjusting the timing belt end of things?

Is it likely, or indeed possible for it to go from a fine running and well adjusted set up to what I have now without being mucked about with?

I'm only asking as I am starting to get outside of my comfort zone in a big way and might have to wave the white flag and get it done rather than do it.

Thanks again for all the help either way

The timing can get out if the cam belt jumps a tooth. Does this engine have an EP mark on the flywheel?

Aaron

Originally Posted by finallyrangie

New belt went in when the engine was swapped, done about 50k since, so it's not new but I would like to think they last longer than that, if I'm wrong I am happy to be told.

The basic rule of thumb is 80,000km for a belt but they'll go longer than that quite happily, although not recommended here in Oz.
In temperate zones IIRC the changeout km is 115,000km.

The genuine HS2.8 timing belt is actually an HD version of the Tdi one from when a ate chased up the slight variation in part number, but you can't get them here at all so everyone just uses the Tdi version.
The cam and pump pulleys on the MWM International engine are better quality items than the Tdi too, being cast and machined rather than pressed metal.

The belt we fitted was a standard 300tdi one as you say couldn't get a 2.8 one, but they did appear to be identical.

I don't know if there is a mark on the flywheel but as long as it stops raining sometime tomorrow I will have a look, we have a storm supercell hereat present, it's a bit damp with no shed.

80k is good to know, I had in my head 100 being alright, but if changing it now sorts the problem then it's a job worth doing, is there any way of stopping the new one from jumping as well or do they just stretch as they age?

Jumping a tooth is unusual, unless the tensioner pulley bolt has loosened (it's loctited so shouldn't) or if they do excessive km they can strip a tooth, but I've seen belts with 130,000km and they looked pretty good (although definitely not recommended)

Belt tension is critical, the tension in the '98 workshop manual is too high and that can cause problems of premature wear.

There's a later TSB recommending a lower tension.
That should be followed.

And mad storms here in NSW and the ACT too, good luck.