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YOUR RESEARCHIms bearing centre bolt m96
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Use (lock nut torque is only 13nm according
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Suggestion
Do these really shear in normal use (lock nut torque is only 13Nm according to Porsche so there is no tension as such so why high tensile steel?) or only as a result of the collapse of the bearing race?
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Use (lock nut torque is only 13nm according
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
Do these really shear in normal use (lock nut torque is only 13Nm according to Porsche so there is no tension as such so why high tensile steel?) or only as a result of the collapse of the bearing race?
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Does anyone have a old ims centre bolt that goes through the bearing, i have a mate who can engineer a new up rated bolt if we can get the dimensions of it i don't want to pull mine out if we can't get one made first. Obviously don't mind a reasonable fee and postage for it . Thanks
How is it to be uprated, the weak point on the standard bearing post is the waisted section where the O ring sits. The strongest way to upgrade it is to do away with the waisted part, and have an O ring at the rear of the IMS cover.
I know this works as when my bearing disintegrated my Hartech uprated bearing post kept all the bearings within the bearing cage, so as not to allow the timing chains to go off piste.
Do these really shear in normal use (lock nut torque is only 13Nm according to Porsche so there is no tension as such so why high tensile steel?) or only as a result of the collapse of the bearing race? Even then a shaft with an M8 thread under cut at its lead in to not much more diameter that the O-ring groove with engine forces on it is still going to be vulnerable.
One of the early clues that the bearing post has broken off is a distinct noise of the nut/bolt bouncing around the bellhousing, very shortly before the engine stalls due to the timing being lost, and internal hell breaking loose.
Potentially an imbalance of the bearing causes this before the post breaks.
It more to do with that when you pull the bearing out it puts strain on the bolt so it's not best practice to reuse it, but with a new bolt i can refit a new standard double row bearing with the seals removed which i prefer rather than a expensive kit. The upgrade of the bolt just makes sense as it's the weak part.
I didn’t realise that new standard double row bearings in the same spec were still available. I thought that just Single row exist or aftermarket options?
The double row bearing is one of these:
Deep Groove Ball Bearing - Double Rows BD20-17-A-DDUA17NX01-NSK 20x47x23.812mm.
More than 10 million parts in stock at 123Bearing. Bearings, belts, seals and rod ends at the best price and available in stock. Fast delivery!
www.123bearing.co.uk
I'd be highly surprised if there was an excessive tensile pull on the bearing if you use a proper cylindrical puller threaded onto the M8 tread of the post, it's not like it is only an 8.8 cheap bolt. Remember there's a whole aftermarket industry been built up to profit from scaring everyone about M96 IMSBs.
There is no oil feed to the bearing as such and a sealed bearing was spec'd by Porsche for this reason.
we have seen them snap whilst trying to pull a double row out the force to get the spring clip around the bearing to release is enough sometimes , that's why in some of the kits with the pullers there is an adaptor thats fits though the bearing in case this happens. The bearing can live happily from the splash oil with the seals removed.
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