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YOUR RESEARCHDo I need new engine mounts?
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transmission mount
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Suggestion · Original poster
Is the hard "thump" a normal Porsche experience, or do I need to replace the engine mounts?
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Performed · outcome unconfirmed
Just replaced my motor mounts with the set from Rein.
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Suggestion
Replacing the (engine) mounts, even without symptoms which indicate wear, could be one of the cheapest 'mods' improving car handling you could do for your 996.
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Ever since I purchased my 996 cabriolet from a good friend 2.5 years ago with 120,000 miles on it, I've wondered if I need new engine mounts. He told me they had been replaced once, but he didn't know when.
I don't feel any excessive engine vibration (a common symptom of bad mounts); instead, what I feel is as if there's no "shock" absorption at all when I go over some uneven roads - so I get a hard thump from the back of the car.
I recently replaced front and rear suspension, control arms, and rear drop links, and have all new tires.
Is the hard "thump" a normal Porsche experience, or do I need to replace the engine mounts?
Thanks in advance!
I get a hard thump over uneven roads/unexpected bumps as well. It has done that as long as I've had it (4 months, 1800 miles). My assumption was that it was related to the engine mounts, but if it isn't, I'd love to know what direction to look.
I also have sagging exhaust tips (more so on the left side than the right), so I definitely do need new engine mounts.
It is never a bad idea to replace the engine mounts at a certain stage during maintenance. Certainly to consider when you are taking on various other maintenance items in order to set a kind of maintenance reference point.
The mounts are a common wear item of the car which a lot of owners not consider to replace. For those with tiptronic gearbox do not forget to replace at the same time the transmission mount! The mounts are the 3 points which hold your engine in place. For manuals the transmission mount is not prone to wear that much and lasts much longer.
Replacing the (engine) mounts, even without symptoms which indicate wear, could be one of the cheapest 'mods' improving car handling you could do for your 996. Even when staying with the OEM mounts. I replaced mine some months ago because the exhaust tips started to sag on one side. And I noticed some wobbling unbalance with bumps and cornering. After the replacement it seemed I got another car back.
What about the shocks itself? Did they got replaced over time. If not after your mileage I would be looking for replacing/upgrading them.
Attached are three photos. It does look like the pipes are REALLY close to some other components, so that likely explains the "clunk". So is it a matter of replacing the mounts again? Mounts appear to be an easy project.
Just did mine with the Rein mounts from pelican and it was really easy they were not too expensive, probably no more than an hour and 30 minutes maximum. My car was new to me and seemed a little rough at idle. This was a good supplement to the pelican article (
engine mount article
) as it gives you the torque settings and tool list. I had to buy a long reach (deep) socket to get the main bolts off and they were bloody tight so make sure car is well supported.
Three photos? I only see one and that one doesn't show the tips. It does show what looks like small dents in your exhaust pipe though. Have you been backing into something?
Post a pic like this one, but with both tips showing.
Doesn't appear to be sagging. Shocks or transmission mount make sense. For the latter, you can go to Home Depot and buys some.... Oh never mind. Look for delrin transmission inserts.
Files were too large so I was only able to upload one photo. I'll need to take another photo to show both tips. The previous owner had a low driveway approach, so he scraped the exhaust on a regular basis until he replaced the engine mounts.
Thanks to all for your helpful comments.
I recently replaced mine and the difference is noticeable. If you think it's been several years might as well upgrade. The tailpipes should hug the car, with much less than even half and inch gap.
I ordered a set of the Rein mounts and just haven't put them on yet. They look identical to oem.
I tried the semi solid in my DD and didn't like them. The vibrating hum at 4K RPM bugged me. Like a drone with an exhaust. Other people love them so it's a matter of opinion.
If you want to get fancy, get the elusive GT3 oem mount. It's the same as the 993 mount from what I've been able to tell but not positive on that. My track car came with them but I don't have it here to get the part number.
I installed OEM and am satisfied. Noticeable difference versus the old set of OEM. No perspective on the other brands of mounts, OEM is cheap on AutohausAZ
$74.30 each from warehouse33auto.com with the 10% "RENNLIST" coupon code:
http://www.warehouse33auto.com/parts...05/10/0/5552/0
They usually have cheaper shipping also.
I too installed the Rein brand ones about 5K miles back and they seem to work fine. One thing that you may also want to look at since it happened to me. You may want to look at the state of the transmission mount. My indi brought it to my attention after driving my car and suggesting that I get the motor mount replaced. The Transmission mount on my car was in bad shape from having to support both the tranny and the motor due to the bad/extended motor mounts. I replaced it as I was dropping my whole motor and trans, now pressing it in and out was a bit of a pain but plenty of DIY info and tutorials for both the motor mounts and tranny out there.
Try FCP Euro.com $70.99 each, Free shipping.
I did mine this weekend with Reins and I think the pipes did go up a bit, it wasn't dramatic. The vibration of an unoccupied seat at idle is 95% gone now.
Very easy to do though, although one of the grommets for the airpump with the built in nut rotted away and I need to order another one though
I went with the Rein ones for my 03. I felt it was as easy a job to replace as anyone else. I got mine at Rock Auto if I remember correctly. Shop around.
My cabriolet is 100% stock so I went with "Rein" purchased at AutohausAz which is frequently less expensive than Pelican Parts. I paid $95.99 each.
It's one of the easiest repairs on the 996.
Good luck.
