Crank shaft pulley

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Oh its tight alright, I did it to the maximum of my torque wrench then put my breaker bar on it and did it some more untill the bar was bending!

Just have to get a new water pump gasket today and put the belts back on and I am back in business. Did try it briefly and it runs well and quietly, it was sounding like there was a bag of old spanners crashing arround in there!
 
James said:
Oh its tight alright, I did it to the maximum of my torque wrench then put my breaker bar on it and did it some more untill the bar was bending!

Just have to get a new water pump gasket today and put the belts back on and I am back in business. Did try it briefly and it runs well and quietly, it was sounding like there was a bag of old spanners crashing arround in there!
Click to expand...

Seems like a better outcome than you feared a few days back!
Lots of jobs like that work out fine once you have confidence that some neat engineering will fix it. Other times you need brute force, large hammers and a stick welder.

CharlesY
 
Seems to be a good one! got the rest finished and drove it. I just need some antifreez for the radiator as I don't have any in at the moment. It was also a good oportunity to do the cam belt, I have had the bits for a year or 2 just can't find the time to do it. Now it's done I am happy. Thats 2 big jobs in a month, first the clutch and then this oh and also got it throught the MOT.

I am feeling quite happy with my self being able to do it, just thinking of the money I have saved as well as enjoying doing the work.
 
Check what trhe correct torque is for the pulley bolt.
It may be enormous.
My TD5 needs 455 Newton-metres that's THREE HUNDRED AND FORTY foot-pounds.

Yours may be the same. If so, I bet you haven't come close yet!

CharlesY
 
CharlesY said:
Check what trhe correct torque is for the pulley bolt.
It may be enormous.
My TD5 needs 455 Newton-metres that's THREE HUNDRED AND FORTY foot-pounds.

Yours may be the same. If so, I bet you haven't come close yet!

CharlesY
Click to expand...


According to Rave....
TV Damper pulley bolt to crankshaft 80 + 90°NM
 
James said:
What is the TV bit?
Click to expand...

TORSIONAL VIBRATION Damper.

The extra bit of the pulley (more than just the bit the drive belt runs on) is like a little flywheel. In fact it IS a little flywheel, mounted on a rubber ring.

The flywheel part of it is the steel ring outboard of the rubber ring that glues it onto the pulley itself.

The plan is that the flywheel part soaks up the tiny rotation kicks the front end of the crankshaft receives as the engine fires, and then immediately it kicks back, the end result being a smoothing-out of the rotation of the nose-piece of the crankshaft, thus applying a smoother pulse-free drive to the cam-belt (or timing chain) which should help to extend the working life of those bits. It may also help to reduce the risk of fatigue failure of the crankshaft itself.

Personally I think it's as much in theory as in practice.
But what do I know?

Perhaps a graduate in engine dynamics can say more?

Meantime be aware that in a 4 cylinder 4-stroke engine there are huge forces trying to twist the crankshaft pulley on the shaft twice per revolution. That is why the pulley bolt is supposed to be so Goddam tight. You found out exactly what happens when it isn't - Woodruff key battered to bits and shaft damaged.

CharlesY
 
80 - 90 foot-pounds is pretty tight.

But then another quarter of a turn extra tightening. Wow.

That is TIGHT!

I think most of us would be worrying about breaking the head off the pulley-bolt before we got it that tight.

They certainly take a bit of UN-doing.

CharlesY
 
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