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Question on IMS design

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YOUR RESEARCHQuestion on IMS design

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Install ims bearing and the bolt is not centered

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Performed · outcome unconfirmed · Original poster

Saw someone installed the IMS bearing and the bolt is not centered when the belt tensioners are not released.

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Question on IMS design
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Leading evidence: 'Install ims bearing and the bolt is not centered' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install ims bearing and the bolt is not centered' (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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Install ims bearing and the bolt is not centered

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

Saw someone installed the IMS bearing and the bolt is not centered when the belt tensioners are not released.

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Question on IMS design
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

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POST 1 / ORIGINAL POSTEROriginal post

Saw someone installed the IMS bearing and the bolt is not centered when the belt tensioners are not released. So does it mean this end of the IMS shaft (#6 in the diagram below) is "floating" inside the case? I mean looking with all the tensioners in place, #10 is pulling the IMS upward and the #11's are pulling it sideway and slightly upward. What is pulling the IMS downward to counteract the forces then?? The tiny IMS bolt? junk.jpg

POST 2Original post

Without the IMS seal/flange to keep the intermediate shaft centered, the tension from the chains can pull that end of the IM shaft out of center. Rick 99 996C4 87 944S

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 7144273

Hi Rick, Thanks for the explanation. So that also means all the net forces from the tensioners will be exerted onto the (tiny) center bolt on the IMS bearing and the 3 bolts on the flange...isnt' that a lot of lateral force the bolts and bearing have to bear then?

POST 4Original post

The tensioning rails keep the chain from going too far upward when the IMS isn't bolted down. And the bearing end of the IMS isn't "floating", each end of the shaft connects to one of the cams, such that at the front of the engine it's pulled to the left by the cams, and at the rear of the engine it's pulled to the right. You can see it better in a top-down view.

POST 5 / ORIGINAL POSTEROriginal post

Quotes source post: 7144301

Thanks Dave. By floating, I mean without the IMS flange installed, it will be kind of "floating". Otherwise, how do we explain the center bolt can get de-centered? Oh yea, I forgot about that actually the left and right chains are actaully on the opposite ends of the engine.

POST 6Original post

The flywheel end of the IMS has the bearing centered by the flange. The other end of the IMS is centered by the oil pump. So it does "float" a bit when either of these is removed. To remove the IMS flange or the oil pump you are supposed to take out the chain tensioners to take the pressure off the IMS.

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