Grumbling transmission
- JohnLiles
- 356 Fan
- Posts: 206
- Joined: Tue Dec 11, 2012 8:56 am
- Location: London and NW England
Grumbling transmission
I have a '57 356A T1 , original gearbox , it makes a noise like a food mixer fed with rocks when moving away in reverse , and also to a lesser extent when moving away in first . When up to speed there is a slight whine from transmission in all forward gears , synchro works fine up and down the gearbox .
I attach a link to a short youtube video , have posted this already on the Porsche 356 Facebook site , however I feel that the registry may have more chance of getting some helpful feedback on what might be the cause of the foodmixer noise !
I plan to hand the car over to an experienced 356 workshop here in the UK for any mechanical dissection !!
https://youtu.be/hN91wf4yfbM
I attach a link to a short youtube video , have posted this already on the Porsche 356 Facebook site , however I feel that the registry may have more chance of getting some helpful feedback on what might be the cause of the foodmixer noise !
I plan to hand the car over to an experienced 356 workshop here in the UK for any mechanical dissection !!
https://youtu.be/hN91wf4yfbM
1957 'A' and 1955 'Continental Outlaw'
- Jacques Lefriant
- 356 Fan
- Posts: 4602
- Joined: Mon Dec 06, 2010 1:50 pm
- Location: Washoe county NV
Re: Grumbling transmission
Hi
the reverse gears are straight cut and subject to face damage. Check your magnetic drain plug.
j
the reverse gears are straight cut and subject to face damage. Check your magnetic drain plug.
j
- John Brooks
- 356 Fan
- Posts: 2146
- Joined: Tue Jul 08, 2008 11:50 am
- Location: Whidbey Island WA.
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Re: Grumbling transmission
Yes. And you probably need a new shaft. Here is what to expect, this a reverse & first growler.
John Brooks
62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965
62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965
- Vic Skirmants
- Registry Hall of Fame
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- Joined: Tue Oct 27, 2009 5:02 pm
- Location: SE Michigan
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Re: Grumbling transmission
That really has nothing to do with reverse gear.John Brooks wrote: ↑Wed Jan 25, 2023 3:27 pm Yes. And you probably need a new shaft. Here is what to expect, this a reverse & first growler.
- Graeme Langford
- 356 Fan
- Posts: 273
- Joined: Tue Jul 07, 2020 5:45 pm
- Location: United Kingdom
Re: Grumbling transmission
I am no expert. But that noise when you are in the garage with very little forward movement. Could that be from the clutch assembly rather than the gearbox ?
1958 356A
1967 911S
1967 911S
- Martin Benade
- 356 Fan
- Posts: 12193
- Joined: Wed Nov 23, 2011 10:52 am
- Location: Cleveland, Ohio
Re: Grumbling transmission
On a side note is that main shaft bearing inner race in normal decent condition? Mine looks just like that and I’ve pretty much decided that it’s ok. It’s a tiny bit noisy idling in neutral but otherwise makes no odd noises.
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
- Randy Mittelstet
- 356 Fan
- Posts: 295
- Joined: Sat Jun 14, 2008 7:37 pm
- Location: Denver
Re: Grumbling transmission
If the problem is a bad clutch throw out bearing,
what would be the symptoms and sounds?
Would the grinding rock sounds occur with the clutch
pedal pushed down or with no foot on it?
what would be the symptoms and sounds?
Would the grinding rock sounds occur with the clutch
pedal pushed down or with no foot on it?
Randy Mittelstet
Denver
1960 early Roadster
Denver
1960 early Roadster
- Steve Proctor
- 356 Fan
- Posts: 1318
- Joined: Fri Mar 28, 2008 12:15 am
- Location: Spring Hill, TN
Re: Grumbling transmission
It sounds like you have a stock-weight flywheel, but friend Jack Allen had a flywheel that was lightened with both a circumferential cut and lightened further with dozens of large holes. It was literally swiss cheese. His transmission rattled like crazy until he replaced the flywheel. If I recall correctly, I believe a "street lightened" flywheel is usually about 11-14 pounds, so I have no idea how light his was.
STP
Steve Proctor
Member Since 1977
VIN 84757
Steve Proctor
Member Since 1977
VIN 84757
- Al Zim
- 356 Fan
- Posts: 4309
- Joined: Thu Mar 27, 2008 12:37 pm
- Location: FT.WORTH/DALLAS TEXAS
- Contact:
Re: Grumbling transmission
I know you are THERE and do not have access to what is available here in the colonies. HOWEVER Zim's has used SWEPCO (exclusively) a gear oil for Close to 30 years. It was magic with the Porsche synchronizers. (also in the differential of my then ancient Volvo) Someone in England or Europe has a magic oil. DO NOT REMOVE THE TRANSMISSIION!!! There is a good possibility that the rear of the car will have to be aligned (front with it) which cannot be done on the floor of your garage with a piece of string. DRAIN THE OIL INTO A CLEAN PAN and see what is there. Stick a magnet into the drain hole (magnet on a wire) and see what comes out! DO NOT MAKE MORE WORK AND COSTS FOR YOURSELF. al zim
www.allzim.com
356 Parts and Services
www.facebook.com/ZimsAuto/
www.instagram.com/zims_autotechnik/
356 Parts and Services
www.facebook.com/ZimsAuto/
www.instagram.com/zims_autotechnik/
- Martin Benade
- 356 Fan
- Posts: 12193
- Joined: Wed Nov 23, 2011 10:52 am
- Location: Cleveland, Ohio
Re: Grumbling transmission
That’s a good point to check it out in place as much as possible. As for an alignment, it depends on who’s holding the string.
Al, this wouldn’t be commercially viable, but you are probably among the people that could get it spot-on with a tape measure and string.
Al, this wouldn’t be commercially viable, but you are probably among the people that could get it spot-on with a tape measure and string.
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
- Graeme Langford
- 356 Fan
- Posts: 273
- Joined: Tue Jul 07, 2020 5:45 pm
- Location: United Kingdom
Re: Grumbling transmission
Hi Al, Can you let me have the exact details of the Swepco oil that you use. I would like to try some in my gearbox as I occasionally get some strange noises from itAl Zim wrote: ↑Thu Jan 26, 2023 12:14 pm I know you are THERE and do not have access to what is available here in the colonies. HOWEVER Zim's has used SWEPCO (exclusively) a gear oil for Close to 30 years. It was magic with the Porsche synchronizers. (also in the differential of my then ancient Volvo) Someone in England or Europe has a magic oil. DO NOT REMOVE THE TRANSMISSIION!!! There is a good possibility that the rear of the car will have to be aligned (front with it) which cannot be done on the floor of your garage with a piece of string. DRAIN THE OIL INTO A CLEAN PAN and see what is there. Stick a magnet into the drain hole (magnet on a wire) and see what comes out! DO NOT MAKE MORE WORK AND COSTS FOR YOURSELF. al zim
1958 356A
1967 911S
1967 911S
- David Jones
- Classifieds Moderator
- Posts: 7323
- Joined: Tue Mar 25, 2008 6:32 pm
- Tag: I wish I knew as much as I think I know.
- Location: Kentucky
Re: Grumbling transmission
Graeme, Google swepco 201. About 80 pounds a US gallon in the UK.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
David Jones #9715
Cymru am byth
David Jones #9715
- Graeme Langford
- 356 Fan
- Posts: 273
- Joined: Tue Jul 07, 2020 5:45 pm
- Location: United Kingdom
Re: Grumbling transmission
Thank you David, can you remind me how much oil the gearbox takes
1958 356A
1967 911S
1967 911S
- David Jones
- Classifieds Moderator
- Posts: 7323
- Joined: Tue Mar 25, 2008 6:32 pm
- Tag: I wish I knew as much as I think I know.
- Location: Kentucky
Re: Grumbling transmission
3.5 litres Graeme.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
David Jones #9715
Cymru am byth
David Jones #9715
- Graeme Langford
- 356 Fan
- Posts: 273
- Joined: Tue Jul 07, 2020 5:45 pm
- Location: United Kingdom