Engine seized 300tdi

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julianf said:
early engines had the rim on the tensioner, and not on the crank
there was an upgrade kit that removed the rim from the tensioner, and added it to the crank

this is what happens if you fit a new tensioner, without fitting the new crank pulley -

DSCF7705_zps32d408ce.jpg


DSCF7714_zpsf40d231c.jpg
Click to expand...

Thats a right mess.........someone made a bit of a booboo.
 
right - i did not think there was an option.

when you refit the belt with the gauge, i guess you will be able to compare the tension set with tools, with your memory of the tension you set 'by eye'

hopefully, you will consider them different enough to be the cause of the issue. if you think they are both the same, then that would be of more concern.
 
I had similar symptoms to you when my timing belt failed last year. Quite a bad failure too like yours.

After refitting the new timing belt kit, new push rods & rocker arms we stuck the crank damper on and ran the engine up without the timing cover on for a short while. To see if we could see any issues as to why the belt had failed.

What we did notice was, the belt was running off the back of the FIP and cam sprocket (you could see it within minutes). It must have been running off gradually over a couple of thousand miles and rubbing on the engine casing, eventually snapping. The belt hadn't been fitted too long.

Anyway, we swapped the cam and FIP sprockets over, which in turn the belt was grabbing on the other side of the teeth. And it's been absolutely perfect ever since. I'm not sure if the sprockets wear at a certain milage, or even warp in someway. But all I can say is, it fixed mine.

I just wanted to throw that out there in case you end up having the same trouble.
:)
 
I would definitely go over everything this time and like d90 says run with cover off just to make sure it doesn't happen again as something must of caused it to fail.
 
When I last did a timing belt I had lost my dial-type torque wrench and so I improvised by hanging a bottle with a calculated amount of water on the end of a 3' bar to give the correct torque while I did up the bolt with the 'click' type one.
 
Running with the cover off -

The crank dampener bolt has to be done up tight, so how does running with the cover off work with this?

What i mean is, i guess there is a reason why it has to be so tight, so... (?)
 
You still fit the pulley and damper bolt. That is what holds the timing belt crank sprocket in place. Wont need the full torque for a 5 min run, just kin tight!
 
Marmaduke said:
I think I may have found the culprit sadly,

Brand new dayco timing belt that's now one solid lump. Doesn't explain the scoring though but it's that fine I can't feel anything. I'm thinking that the oil came in through the valves when the belt went and the pushrods bent
Click to expand...
Looks like the yarns wrapped round the bobbin. :eek: :(
Have yer fixed it yet?
Have tools will travel. ;)

71D7NevDv2L._SX522_.jpg
 
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