Front timing cover 300TDi, why change it?

it is possible that the higher torque could swell the inner race putting a small load on the bearing making it harder to turn,some engines when getting rebored need the head bolts installed using an adapter plate because the bores destort when the head is torqued down,toyota wheelbearings that use the double nut on the stub axle are another thing adjust the bearings using the first nut and when you lock it up with the second nut the movement in the thread over tighten the bearings

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Originally Posted by camel_landy

And you base that decision on??

Me... Well, I s'pose I should have qualified my statement as that's what I was taught by the guys at the LandRover Technical Training Academy? ;)

M

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I base my statement upon my understanding of what the other modifications did, and also that many have had the other mods done, but not the reduced torque on the tensioner.

And I don't give much credo to what you thought some guys at the LandRover Technical Training Academy told you.

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Originally Posted by stevo

it is possible that the higher torque could swell the inner race putting a small load on the bearing making it harder to turn,some engines when getting rebored need the head bolts installed using an adapter plate because the bores destort when the head is torqued down,toyota wheelbearings that use the double nut on the stub axle are another thing adjust the bearings using the first nut and when you lock it up with the second nut the movement in the thread over tighten the bearings

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The torque in question is not a tightening torque of a bolt.

The tensioner pulley is located on an arm which pivots. A torque value is used to rotate the tensioner arm with the tensioner pulley against the timing belt, to achieve the recommended tension in the belt, before the bolts are tightened to lock the tensioner in place.

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Originally Posted by Bush65

I base my statement upon my understanding of what the other modifications did, and also that many have had the other mods done, but not the reduced torque on the tensioner.

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Yeeessss.... The mods certainly helped & reduced failures but the failures were still there and at unacceptable levels. The mods that were fitted were merely dealing with symptoms rather than getting to the root cause... The guide on the pully, modified hanger (to allow movement), etc...

They finally worked out that the torque on the tensioner was actually distorting the timing casing and that the distortion was causing the belt work itself off, pushing it into the cover & causing premature failure.

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Originally Posted by Bush65

And I don't give much credo to what you thought some guys at the LandRover Technical Training Academy told you.

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These only happen to be the guys that train the service technicians for all over the world! But hey, you obviously know better... ;)

You don't need the mods but if you have the extra $$$ burning a hole in your pocket it doesn't hurt to fit them. Either way, you MUST reduce the torque.

M

Resurrection of an old thread I know.

But what the status of this mod these days? Worth doing or what is better?

Also, is there any way of telling if the timing modification has been carried out already without taking the timing cover off?

Regards,