D24T.com - Fuel pump belt

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Hi all
I'm a newbie here
I've had a few volvos and this is my second 940 tdi
I have a problem I'd like to share and see if anyone can help.
My engine conked out and became very hard to start and misses and smokes like hell.
I'd say running on 3 cylinders if lucky.
After a lot of head scratching and removal if rocker cover I deduced it must be the fuel pump drive belt.
It's very loose and I've never changed it.
So I'm going to check the timing of it but I'm not 100% sure if what I'm doing.
If I get TDC and put the locating pin I the fuel pump will that give me the timing set up so I can put a new belt on in the right position?
It will also tell me if the engine has slipped a couple of teeth on the pump drive belt.
Any feedback would be welcome.
I'm pretty handy with a spanner and ratchet, but not great at the technical end of things.

Quote:

Originally Posted by riverhead (Post 9183)

My engine conked out and became very hard to start and misses and smokes like hell.

Did this happen all of a sudden or slowly deteriorate? What color smoke? What does it do at higher RPMs? Can you see air bubbles in the transparent fuel line?

Quote:

Originally Posted by riverhead (Post 9183)

After a lot of head scratching and removal if rocker cover I deduced it must be the fuel pump drive belt.
It's very loose and I've never changed it.

What did you find under the valvecover?

The belt should be "loose." Too tight and it will prematurely wear the IP mainshaft bushing/seal, ultimately causing problems from air intrusion.
Should be able to twist it almost 90deg. twisting it with thumb and finger, moderate force.

Quote:

Originally Posted by riverhead (Post 9183)

So I'm going to check the timing of it but I'm not 100% sure if what I'm doing.
If I get TDC and put the locating pin I the fuel pump will that give me the timing set up so I can put a new belt on in the right position?
It will also tell me if the engine has slipped a couple of teeth on the pump drive belt.

Best method for checking timing does not use locating pin. Read up, starting here:
http://d24t.com/showpost.php?p=8451&postcount=6

Hi Just got to have another lock at it and cant figure how to lock the pump in the right timing position.
The car was runnign at high revs on the motorway and black smoke appeared, not too much and then she died slowly, enough for me to get her off the road > it then would start but ran really really bad.
Bad grey/black smoke.

I just checked the belt on the pump and it does not seem as loose as I thought.

Any suggestions.

Huw

Under the cover was fine. Cam looks good, cant see any sign of valve damage.
Dont know what to look at next.

No bubbles in the air line

black smoke without speed increase hints of air or exhaust restriction to me. air filter? turbo spin freely?