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Discussion summary
YOUR RESEARCHFactory IMS flange install?
Leading reported evidence
Replace o-rings
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Suggestion · Original poster
I'll be using new thread sealant for the 3 bolts and replacing both o-rings.
Leading evidence: 'Replace o-rings' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace o-rings' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
It is not required for rebuilds where we use a fresh bearing without seals.
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Suggestion · Original poster
I'll be using new thread sealant for the 3 bolts and replacing both o-rings.
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911uk: 1 discussions
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I'm about to assess and if all goes well pull the IMS bearing grease shield and then button everything back up. However, after a preliminary clean up I noticed there's soft grey gasket sealant around the IMS flange bolts and under the flange 'ears' themselves. Is this common practice for a MY1999 996 from a factory installation standpoint or should I assume it has been opened up? I'm guessing this will be the early single o-ring flange, and if so I may replace it, or maybe reinstall in likewise fashion to how I've found it. Anyone clear on whether this is factory or even an accepted method? Much appreciated.
Bolts have thread lock on them , they don't have the sealant in the picture from new , this has been removed before .sealant on the bolts is a common garage practise .
Thanks Alex, do you know if your original flange was reinstalled? There are so many guides and posts on replacement parts and very little on assessment and reinstallation. I know these early dual row flanges have different dimensions which further complicates.
There is no gasket , IMS flange has a rubber O ring seal on the shaft and on the flange you remove ( triangle bit ).
sealant looks like dri-bond .. an old porsche sealant that is no longer used .
You need to be locking the crankshaft and preferably a camshaft before removing this plate .. or you are in trouble !
A sealant on the bolt threads after refitting is standard garage practise .
Thanks yes, the engine is pinned TDC and both cams locked and tensioners removed. I'll be using new thread sealant for the 3 bolts and replacing both o-rings. Just unclear if I will/should implement some of these garage practices.
Get plenty of sealant on the bolts or you'll be misted up on the bell housing in no time.
Have you though of fitting one of the new design Hartech flanges that force oil in to the bearing?
[Image-only or quote-only post; no author-written text.]
https://911uk.com/data/attachments/115/115962-dd7e114df0f10edb52f66fce27e5ca58.jpg?hash=bsVd37rSHJ
Not until this moment, I'm located in Canada and though I know of the company and have read many Baz threads I did not know about this product. This may be a consideration if I get in there and it's the single rib o-ring. Thanks for the heads up!
Slakker do them in the USA:
(Need to check if there's a suitable option for the 3.4 bearing)
Hartech IMS Flange
Hartech IMS flange for the non serviceable bearing. This product provides better splash oil flow to bearings that have had the front seal removed while in the engine. It is not required for rebuilds where we use a fresh bearing without seals.
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