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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHNew Clutch & IMS - Now strange Transmission sound
Leading reported evidence
Install while the transmission was out of the car
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed
I had the LN ceramic dual row IMS bearing installed while the transmission was out of the car.
Leading evidence: 'Install while the transmission was out of the car' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check dangling stuff' (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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Performed · outcome unconfirmed · Original poster
Replaced Single IMS bearing with an IMS Retrofit ceramic hybrid double row bearing
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Suggestion
Sound during movement means something on the transmission side of things, check dangling stuff on the driveshafts maybe?
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Suggestion
I couldn’t find any reasonably priced repair so I opted for a rebuilt transmission from Vertex Automotive.
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Suggestion
That one is a real PITA to replace, requiring a huge press to un-stack all the gears to get to the bearing.
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Suggestion
I"m sure if the bearings are the issue, you could get them removed and match the numbers to a non-Porsche source .I'm sure the bearings used are commonly used in other brands as well.
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17 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T154520Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello Porsche Fans,
I had my mechanic do the following on my 2001 Carrera 4.
Replaced Single IMS bearing with an IMS Retrofit ceramic hybrid double row bearing
Replace RMS
New Clutch
New rear shocks
The transmission now has a strange low level sound when it's moving while in gear; It sounds like a scrapping sound: 'shhhh....shhhhh...shhhhhhh'.
However, it does not make any sound when it's moving or standing in neutral.
It happens in all gears and at any speed on any road. Sounds like brake pads against a rotor with rust on it after sitting for a couple of weeks.
The clutch feels excellent and the car shifts and drives like new. My mechanic told me he took my car for a 5 mile drive after he did the above work and it was perfect, however when I went to pick it up today the unusual sound started the moment I drove off the lot.
I drove right back to the shop and had him take a drive with me and he heard the odd sound immediately. He was very surprised and a bit unnerved and said if he knew that sound was there he never would have told me to come pick it up.
He said he never heard that sound before after doing dozens of clutches and IMS bearings and said he will put it on the lift in the morning and see what is going on.
Thoughts?
Wait, you put a dual row bearing in place of a single row? is that right? I didn't know you could do that.
Sound during movement means something on the transmission side of things, check dangling stuff on the driveshafts maybe?
Sure it isn't a rock on the rotor?
Could be a number of things but if hes willing to fix it i'd let him diagnose it. Sounds like he needs to open it back up and re-lube everything.
If it wasn't there before i'd say the reassembly is at fault.
Sure can its LN's IMS Dual Row Pro - double in place of a single like MK1 cars have.
He showed me the special tool that he had to use to put in the IMS bearing. Here is a pic of it. dan_189, I think you are correct, something is not quite right with the reassembly. It did not have the noise before he did the work so.....
I will report back here with what he finds.
You will only hear the pilot bearing with the clutch applied, otherwise input shaft is locked with the crankshaft.. I'll bet to something with the rear shock change.
I had a similar problem with my ‘99 Cab... If the noise is while under power or engine braking, its likely transmission. If the noise follows the engine then it’s the input shaft main bearing. If the noise follows the vehicle speed, then its The output shaft bearing or the pinion bearing. All are somewhat common problems.
Mine ended up being the output shaft bearing. That one is a real PITA to replace, requiring a huge press to un-stack all the gears to get to the bearing. I couldn’t find any reasonably priced repair so I opted for a rebuilt transmission from Vertex Automotive. Very happy with the results so far, about 7K miles on the tranny.
I had the LN ceramic dual row IMS bearing installed while the transmission was out of the car. Saved a lot of labor charge. Sounds like the OP won’t have that option as he’s already done the IMS bearing.
That's the "faultless" IMSB installation tool. If that's what he used to install the bearing, there's little chance that there's something wrong with the install (hence the name "faultless"...). Gotta be something else... Transmission? Maybe...difficult to diagnose without actually hearing it and ruling out other possibilities along the way. Good luck
The shop called us. We listened to the sound, it's not IMS. The frequency of the sound doesn't match the bearing which runs at half crank speed roughly.
As another poster mentioned, the flywheel was not replaced, so could be throwout bearing, or even something transmission related.
Likely, it's something completely different and unrelated, like an idler pulley or something like that.
If it needs a transmission, I'd stick to one of the professionals like Gbox or a factory crate rebuild. Remember, you get what you pay for and cutting corners leads to spending more money than doing it right the first time.
Update: Turns out it was another car/shop that called us from Ontario, Canada, but sounds like a similar issue.
Got a call from my mechanic. He said the sound is coming from the front differential (it is a Carrera 4 AWD). and it needs to be taken down and rebuilt. I gave him the green light. I will keep you posted on the outcome.
Removing the AWD is also an option on the table.
Thoughts?
How is the Guibo donut?
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I don't know how available the parts are to rebuild the front diff. Use to be the only parts you could get from Porsche was the seals. Other than the seals you could only get the complete unit. I"m sure if the bearings are the issue, you could get them removed and match the numbers to a non-Porsche source .I'm sure the bearings used are commonly used in other brands as well.
As far as converting to C2, that would be more of your personal choice since it would be a modification to original design.
I went by the shop after work today and he had the car on the lift. He had me put on a stethoscope and pointed it right on the front differential while his helper was in the car working all the gears and I heard the exact same rubbing noise ... Shhhhh....Shhhhhh....Shhhhhh.
He then pointed the stethoscope to the transmission and the rubbing noise was not there. That convinced me that the front diff is the culprit. He said I could drive it like that and the noise will probably just get worse but I could fix it later down the line or he could fix it now. He said he has a source for all the parts needed as well.
I gave him the OK to forge ahead and get it done. I will report back the results.
