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Locosaki
Monza


Joined: 03 Jul 2016
Posts: 196
Location: Fife


PostPosted: Mon Jul 31, 2017 6:23 pm    Post subject: Gearbox mount renewal Reply with quote

I had my car in for an MOT and the tester noticed my gearbox mount is split, anyone got any info on what is involved, I had a search through some old posts and some say this is a box out job. It's on a manual C4 if that makes any odds
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Demort
Estoril


Joined: 21 Mar 2015
Posts: 3502
Location: Sussex


PostPosted: Mon Jul 31, 2017 6:50 pm    Post subject: Reply with quote

http://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/36-TRANS-Replacing_Your_Transmission_Mounts/36-TRANS-Replacing_Your_Transmission_Mounts.htm

Cant see you doing it in situe unless theres some sort of press tool out there .

EDIT .. just found this ..


Comments: SSF Imported sells a tool where you do not have to remove the 996/997 transmission to replace a worn transmission mount. You can do the job in less than an hour.

Part # 10 4886 090
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon Jul 31, 2017 9:19 pm    Post subject: Reply with quote

If he's told you your gearbox mount is split he's not MOTing the car within the law (unless you have your undertray missing). It's not visible without removing the undertray and they're not allowed to do that.

you could just fit some of the £30 powerflex inserts: http://www.ebay.co.uk/itm/Porsche-996-97-05-Powerflex-Gearbox-Front-Mounting-Bush-Insert-Kit-PFR57-530/142209402045

These can be fit without removing the box.
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911munKy
Spa-Francorchamps


Joined: 26 Nov 2014
Posts: 358



PostPosted: Tue Aug 01, 2017 8:19 am    Post subject: Reply with quote

Alex, what are your thoughts on the gearbox inserts now that you've had them fitted for a month or so, has the NVH settled or are you still thinking that they require some modification?

Thanks,
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 01, 2017 8:33 am    Post subject: Reply with quote

They are much 'smoother' than when 1st fitted but there is still a noticeable amount of nvh once wound above 3k rpm. I'm back on another 2.5k trip in 4 weeks and think I'll replicate infrasilver's mod before I go. Gotta admit though, the handling on those Southern French back roads was imense with these fitted - taking hairpins at breakneck speed and didn't even get the psm light flashing.
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Locosaki
Monza


Joined: 03 Jul 2016
Posts: 196
Location: Fife


PostPosted: Tue Aug 01, 2017 10:14 am    Post subject: Reply with quote

Iain, thanks for the link, not something I'll be doing myself by the looks of it.

So can th poly still be fitted knowing the original mount is split
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 01, 2017 10:17 am    Post subject: Reply with quote

Depending what you mean by split, I would've thought so. I'm still flumaxed as to how he knows it's split as even with the undertray removed, you couldn't tell without removing the carrier brackets. Personally I think the tester is talking out his rectum.
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Harv
Suzuka


Joined: 18 Sep 2014
Posts: 1146



PostPosted: Tue Aug 01, 2017 12:49 pm    Post subject: Reply with quote

Depending how bad the split is the inserts are a fix for it.

Maybe the under tray is missing but one thing that's certain is the mount will be degraded and perishing by now if its the oem fitted one.

On these cars the nose of the gearbox is only supported with one bush and wasn't really adequate imo to the heavier water cooled engine and box, more power and drive to the front etc, the earlier cars ie <3.2 had a total of 4 mounts.

Wayward, vague handling and hard shifting are symptoms its on the way out or 15 years age/80k+ miles.
 
  
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7193
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Aug 01, 2017 1:13 pm    Post subject: Reply with quote

I'm happy with mine with the modification now it has bedded in, it did take a couple of thousand miles but it's pretty much perfect now. The engine and box feel more a part of the car, I don't have any noticeable NVH and I have plenty of other poly bushes on the suspension.
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 01, 2017 1:16 pm    Post subject: Reply with quote

Thumb you've talked me into shaving mine.
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911munKy
Spa-Francorchamps


Joined: 26 Nov 2014
Posts: 358



PostPosted: Tue Aug 01, 2017 2:40 pm    Post subject: Reply with quote

Infrasilver, I must have missed your bush shaving antics!

I assume that you removed some material from the sides of the insert so that it's a bit more isolated from the chassis and therefore less NVH?
If that is so would the insert not wiggle its way out of gearbox mount holes slightly into the free space that you have created by removing the material?

Any info/pics appreciated.
Many thanks,
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 01, 2017 2:42 pm    Post subject: Reply with quote

He's done a write up on it on his to list thread. They wont wiggle out as the centre part of the outer 'ears is clamped between the original bush and the carrier.
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NLW73
Österreich


Joined: 27 May 2014
Posts: 903
Location: Yateley


PostPosted: Tue Aug 01, 2017 4:23 pm    Post subject: Reply with quote

i went for the function first yellow gearbox mount on the GT3 together with some Torque solutions semi sold engine mounts.

major difference and the car just handles even better than before. NVH is minimal but you can really hear and feel the mezger when winding it up

see in this thread: http://911uk.com/viewtopic.php?t=121777&start=20

the oem gearbox mounts are very soft compared to powerflex and function first...the gear change is just lovely and solid now. well worth doing.

mind you new mounts in OEM spec are going to be better than some 5 year old jobbies and its a fairly quick job once you get all the plates out the way and plastic under cover bits.
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Locosaki
Monza


Joined: 03 Jul 2016
Posts: 196
Location: Fife


PostPosted: Tue Aug 01, 2017 5:44 pm    Post subject: Reply with quote

I've been having a look at new mounts, does the C4 have 2 ? Design 911 have 2 listed, rear extension mount, looks like the front mount but larger
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 01, 2017 5:51 pm    Post subject: Reply with quote

2 engine mounts at the rear, 1 gearbox mount at the front of the gearbox:

Engine mount:





Gearbox mount:


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Locosaki
Monza


Joined: 03 Jul 2016
Posts: 196
Location: Fife


PostPosted: Tue Aug 01, 2017 6:59 pm    Post subject: Reply with quote

Thanks Alex, I wonder why design 911 show 2 different size mounts for the box.

I noticed Harv had a thread regarding the engine mounts, I think I'll go down the same route, I was just a little unsure what to get for the gearbox mount.

As mentioned in one of the posts above, my gear selection isn't brilliant but does seem better as things heat up, I thought this was the norm.

The MOT tester is my mate, I asked him to go over everything when it was on the shaker plates with a fine tooth comb, he could find absolutely nothing with any of the bushing etc, no knocks or play that he could see the only things he did pick up on was the rear engine mounts and he said the gearbox mount was needing replaced as it was split.
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11394
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 01, 2017 7:04 pm    Post subject: Reply with quote

they're different for auto and manual box.

Still don't believe he knew the gearbox mount is split unless he took your box off or the carrier holding it on.
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Locosaki
Monza


Joined: 03 Jul 2016
Posts: 196
Location: Fife


PostPosted: Tue Aug 01, 2017 7:25 pm    Post subject: Reply with quote

I'll speak to him and see what he says tomorrow, he said he had a lever in somewhere and reckoned the mount was split, I wonder if he's found something else and not the gearbox mount as he said it would be easy to change and the gearbox mount is clearly anything but easy.

He's nothing to gain out of it as he wouldn't be getting the work and he know that
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911munKy
Spa-Francorchamps


Joined: 26 Nov 2014
Posts: 358



PostPosted: Wed Aug 02, 2017 3:42 pm    Post subject: Reply with quote

alex yates wrote:
He's done a write up on it on his to list thread. They wont wiggle out as the centre part of the outer 'ears is clamped between the original bush and the carrier.


OK, I found the thread but pics have gone to the Photobucket graveyard,
Just to double check it appears that to reduce NVH it seems like a good idea to cut down the 2 outer plates to the same size as the Outer diameter of the gearbox mount bush to reduce stiffness/vibration transfer and also (not sure here) cut off the top finger part of the insert but still fit it OR cut the webbing section in between the 2 outer parts of the top finger?
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7193
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Wed Aug 02, 2017 3:49 pm    Post subject: Reply with quote

I'll try to repost pictures on my thread later.
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