21 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHtensioner and IMS removal
Reported or suspected cause
single longest step
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report identifying a cause
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.
Reported cause
It was the single longest step that I had when pulling my motor to swap in a new one.
Leading evidence: 'single longest step' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'single longest step' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check inside your cylinders' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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
I used a 1/4" drive socket with a universal and a long extension.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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.
Suggestion
It also allows you to check inside your cylinders.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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.
Suggestion
I removed mine on my 2000 C2 without a flashlight or borescope just using a 1/4” ratchet , extension and socket.
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.
21 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T155324Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Wanted to ask if anyone has had luck removing thier ims bearing while only removing the easy to get to chain tensioners.
I have a '99' carrera and can't seem to get to the right bank chain tensioner under the AC compressor. Are there any
pointers on removing that tensioner? The rear bolt on the compressor is pretty much unaccesible, not allowing me to
get AC out of the way.
Any and all pointers are welcome.
Thanks, Jumpy
Assuming your '99 is like my '04:
To get at the rear AC compressor bolt (which is actually the forward-most bolt, with respect to the car), you must first remove a temp sensor that sits in a rubber grommet on the intake manifold between cylinders 5 & 6. You then remove the grommet, which allows you to insert a socket on a long-ish extension that reaches the head of the bolt. On my '04, the correct socket for all 3 AC compressor bolts is an external Torx type - '99 may be different.
The grommet hole does not allow the extension to exactly align with the axis of the bolt, so it may be challenging to keep the socket on the bolt head while applying torque. A "wobble" type extension might help here.
It will not be easy to see what you're doing, nor to get a hand in there and operate "by feel". Some time ago I bought one of these
smartphone endoscope cameras
, which can be a big help with poor-access jobs like this. It also allows you to check inside your cylinders.
Once the AC compressor is out of the way and you have access to the cam chain tensioner, you'll need a 14mm hex bit (
like this
) to remove it.
I just removed the ac compressor few weeks ago. I used a 1/4" drive socket with a universal and a long extension. Then I put a cheater on it to crack it loose. It's bugger to get at, not looking forward to putting it back in. To take out my tensioner I grabbed a 9/16 coupling nut and it was a perfect fit in the tensioner head.
Once I got this figured out, it became relatively easy. At least on my '04. Remove the throttle body. Remove the temp sensor and grommet as suggested. Place a flashlight horizontally on the passenger side cylinder head, towards the front, aimed towards the compressor to illuminate the area. You will then be able to reach in and actually see what you are doing. A mirror might help too. Took me all day to remove the compressor on mine, about 15 minutes to reinstall it. All before I understood that on the later engines, you don't need to access that tensioner!
Thanks you guys for all the feed back.
I like the walmart boroscope, may stop by there tomorrow.
Seems all my '99' fasteneres are different than the '04' versions. Not that that is the problem.
This fastener is a tough one as I only have a flashlight and a mirror. Difficult to hold everything and
manuver the 13mm socket onto the cap screw. Kinda like cutting your hair while standing in front of the mirror.
I'm thinking the quater inch drive might give a little more room to wiggle the socket into place. The socket keeps
falling off the darn bolt, it is at such an angle. Even using a universal.
I'm guessing that I should try to remove the tensioner on this year 996. I would hate to have to re-time the valve train.
Last resort I will remove throttle body, might be the best option.
Thanks again...
I removed mine on my 2000 C2 without a flashlight or borescope just using a 1/4” ratchet , extension and socket. Just remove the temp sensor and grommet, and you can remove it from there. It’s not at all complicated.
You don�t need to remove the tensioner under the ac compressor to do the IMS bearing. I left mine in - however I did manage to get the compressor off prior to learning it wasn�t necessary to remove. If you search for my IMS diy thread you can read about how I eventually got it off.
I just did an IMS install this weekend, On the 5-chain motors I don't believe it's necessary to pull all 3 tensioners, I locked bank 1 (driver side) pulled that tensioner and the one for the IMS, had no problem pulling my dual row bearing.
That AC bolt is a pain. It was the single longest step that I had when pulling my motor to swap in a new one.
I took a pick of how I got it out, it's in my thread here:
https://rennlist.com/forums/996-foru...l#post13853981
I believe this is correct.
Yes, the trick is to remove the throttle body and the T plenum first then your left hand can get behind the a/c compressor easily. The T plenum needs some fiddling to reinstall but it will be worth it.
You're right, it does. I can only speak to my personal experience. I spoke with an M96 expert and was told it wasn't necessary - the success of my install confirmed that. I don't however know 3 or 5 chain models would make a difference. Better to be safe than sorry. You could always call LN and ask them.
With a 5-chain, you are most likely ok leaving the bank 2 tensioner in place. The 3-chain engine is easier to skip timing relative to the 5-chain. Timing should be verified after the IMSB retrofit regardless.
Or just disconnect the AC lines. Ideally you capture the discharge but if you don't, it is the equivalent to burning about 150 gallons of gas. So not catastrophic but not something you'd want to do everyday. There may be legal ramifications for not capturing it that I'm not aware as well.
I’m changing out the IMS bearing on my 3-chain engine sometime in the new few weeks. Can someone confirm that the bank-2 tensioner under the AC compressor can be left in place? I have it in my notes that it doesn’t need to be removed, but this thread has me second guessing myself.
Thanks to everyone who replied to my thread.
I will try once again to remove without taking apart the intake plenum.
If the intake plenum is removed would that facilitate the removing and replacement
of my broken oil fill pipe as well?
Anyway, thanks again for the posts..
The IMS is supported by the oil pump on the opposite end of the IMSB. You can see that when the bank 2 tensioner is kept in place, the bank 2 timing chain tends to pull the IMS to the right but such movement will be restricted by the oil pump. In contrast on the IMSB end, the bank 1 timing chain will pull the IMS to the left (movement normally restricted by the IMSB flange). If you remove the IMSB flange without removing the bank 1 tensioner, you will find the IMS off center to the left and you are screwed.
When the engine is parked at TDC with cam lock tool installed in bank 1 cams, there is very little tendency for the 4 cams to rotate. There's some but it's minimal and it won't be enough to rotate the IMS.
This is a source reference. Confirm exact model applicability in the original material.
