300Tdi Idler/Tensioner Bolts to Block

Hi,

On a 300Tdi engine, can anyone tell me why the tensioner has an Allen key head bolt, and the Idler has a stud with a nut? Are the bolt and stud threads the same? Someone has got the two mixed up in the past on my disco, and when I tried to torque up the idler to 45Nm, the bolt just spun around - the person has stripped the thread. Any ideas how I might sort this out?

Cheers,
Lew

Hi lew

i had this on my last 300tdi disco where some numpty had bodged the tentioner, with mine i had a stud and nut for one and a bolt for the other and came torque it up and bingo the bolt stripped turned out the hole was about 15mm deep and the bolt was only 5mm long so in the end i had to helli coil it, other than that its a new timing case.

graham
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98 d1 300tdi g.s. auto.

Many thanks for the reply Graham! Did the helicoil solution work out in the long run, and did use any type of thread locking compound to bed it in?

Cheers,
Lew

no i went to an engineers suppliers and got an M12 helli coil kit and found a bolt that would be long enough and it was sorted since then i sold the car to a mate but had to borrow it a couple of times as my then d 2 was in doc and then sold and i used his to go from manchester to cornwall and back 3 times in the past 2 months to visit our caravan in perranporth, i have just bought another d1 300tdi but an auto but the dealer has done the timing belt as a matter of corse but will do as soon as as i suspect he would have used cheep parts.

graham
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98 d1 300tdi g.s auto.

Yup,thats a common one all round on the 300.Helicoil it and use a thread lock compound with a specific breaking point.I will try to find where I got mine and post a link.Try,at least.

forgot to say i used threadlock again from an engineers suppliers.

graham
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98 d1 300tdi g.s. auto.

You might be lucky and have enough thread left to simply flip the stud and put it back the other way round + threadlock. The thread should go back well beyond the length of the stud. Fixed mine last year - still good !

Good luck