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YOUR RESEARCHNoise Level after resealing cam covers
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Replace transmission in
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Reported fix · Original poster
Then my tech (who has the same car as me) simply swapped his transmission in for mine. problem solved.
Leading evidence: 'Replace transmission in' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'pinion bearing in the transmission' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace transmission in' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace transmission in', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
After many weeks in the shop - removed and inspected aux oil pump.
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Performed · outcome unconfirmed · Original poster
Coils were already upgraded by previous owner so just replaced the coil boots.
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Performed · outcome unconfirmed · Original poster
The engine runs more smoothly (had an oil change too), but the pitch and volume of engine noise in the cabin have changed dramatically.
Replace among other things like the spark plug tubes (although
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Suggestion
I would definitely be taking it back to the mechanic whom did the work and specifically inquire as to whether the insulation was replaced, among other things like the spark plug tubes (although that would result in oil splashing around), and if the exhaust had been disturbed.
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Hi all - Newbie member; 1st post. I don't do my own maintenance but I do trust my mechanic. On my '99 Carrera (996.1 Base, 6 Speed Manual), we recently removed and resealed the camshaft covers because one was starting to leak. Took the opportunity to replace the spark plugs too. Coils were already upgraded by previous owner so just replaced the coil boots. So here's my question. The engine runs more smoothly (had an oil change too), but the pitch and volume of engine noise in the cabin have changed dramatically. More noise is coming into the cabin, and the noise is high-pitched. Like a race car! Which would be cool on a track but not when I'm going to pick up a gallon of milk. I't taken a lot of the enjoyment out of driving it. So today I downloaded a noise meter on my phone. Here is what I recorded in the cabin:
36 dB engine off
72 dB after engine start
80 dB @ 4000 RPM
83 dB @ 5000 RPM
85 dB @ 6000 RPM
86 dB @ 6500 RPM
and then I stopped, didn't feel like I needed to redline the engine in the name of research. Have any of you recorded volume in your cabins? I feel like they forgot to install some insulation, or "re-chipped" it or something. The exhaust sounds exactly like it used to OUTSIDE the car, and the RPM at idle hasn't changed as far as I can tell. Of course, I didn't pay any attention to that until after the car was worked on. Anyway - just curious. Happy Passover / Easter, and nice to meet y'all.
JP
I'm no expert on mechanics ( I too use an Indy for just about everything), but something is way off here. Anything above 80 dB should have ear plugs and anything over 85 dB is required ear protection in the workplace. That sounds dangerously high noise in my opinion. You didn't build a straight pipe race car, something is missing here. Just my 2 cents.....
Rule#1 is never come to a car forum with a engine problem and start off by saying "I do trust my mechanic".
If you trusted him so much, you wouldn't have to come to Rennlist to get our opinions. Get my drift?
Now, it doesn't take much more than common sense to realize that what was done during the repair caused the unwanted noise.
We have to be clear that Porsches make "sounds" and Porsche can make "noises". Sound = good good
Noise = bad bad
Obviously, the mechanic made a mistake during the repair, but since we're not omniscient and can't see in the past through the walls of the shop during the work. All we can go is speculate based on the limited information that you've shared.
Is this a cabriolet or coupe?
Questions I would have:
1. Did the mechanic drop the engine?
2. Did he remove the exhaust during the process? Was anything else removed?
3. Did the mechanic use the correct camshaft locking tools before removing the cam covers? Remember, the cam covers on these cars help carry the load of the camshafts. You never remove a cam cover without the proper Porsche locking tools in place. This tool is not to be confused with the more common timing lock/jig.
4. You mentioned he "resealed" the cover, but did he replace the spark plug tubes?
5. Did he replace the chain guides? Common problem with the 5-chain engines.
Why not record some video of the sound and then upload to YouTube and share the link here? Take pictures of the engine bay.
Report back. Good luck!
Perhaps he removed the insulation from the inside top of the engine compartment to allow more room (it tends to sag) and neglected to replace it after resealing the cam covers? I would definitely be taking it back to the mechanic whom did the work and specifically inquire as to whether the insulation was replaced, among other things like the spark plug tubes (although that would result in oil splashing around), and if the exhaust had been disturbed. Best of luck.
You have a valid point... I do intend to take the car back in but I want to drive with him in the car; can't do that while covid is hanging around... I will take some video/pics this week. You just want me to open the engine lid and snap a few pics? Any particular angles?
Here is a link to the video, which doesn't do the noise justice. Sounds pretty good in the video. It's just loud (which can be seen in the dB measurements on phone).
You Tube
I don't hear anything that would cause alarm, what I hear is what we refer in the automotive world as NVH (Noise Vibration Harshness).
I've seen and have a similar instances of very bad NVH after engine out procedures that were caused by the big metal coolant pipes coming out of place and touching the engine/bell housing area. Also failed motor mounts can cause increases in NVH. OR could be one of your belt tensioner pulley bearings.
Better to be safe than sorry, and get a Pro to look at it.
Hi all - thanks for the advice. I did take it back. They never pulled the insulation to being with, so that was not it. He turned his attention to the tensioner pulleys and found that the idle tensioner pulley was loose and noisy. So - all three pulleys being replaced. I'll get it back this week and report back. Happy Sunday -
J
Thanks for noticing !!! As an Ex-Pro no longer getting paid for my opinion or being right, that's the only incentive I have for inserting my thoughts ....
After many weeks in the shop - removed and inspected aux oil pump. replaced IMS Bearing. Replaced all belt pulleys. noise still there. Inched closer to the engine-rebuild conversation. Then my tech (who has the same car as me) simply swapped his transmission in for mine. problem solved. So I get a younger transmission, he gets a new transmission, and I get a quiet car again. Aside from my considerably lighter wallet, this case is closed.
Most likely the pinion bearing in the transmission. The same thing happened to me after my ims bearing was replaced. We finally figured that the previous owner most likely put some additive in the transmission oil to silence it, and when the tech replaced the transmission oil with the ims bearing change (since it was a general checkup) the bearing started making noise again. High-pitched whine that changes with road speed, not engine speed.
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