Broken transmission
Has anyone ever had the middle section of the transmission (the piece which is sandwiched by the 2 casing and holds the bearings) break? This is the 2nd transmission that I had which failed on me. $$$$. It totally polluted my gearbox oil (all silver now due to aluminum shavings) so I hope it has not spoiled the synchros or gears.
Dr. Alban
Mats,
I wish I knew what was the root cause. This 2nd transmission has the same component failure as my last one. I'll try to get some pics when I'm at my mechanic's place.
GTV6sa,
I didn't look at the part which failed yet, but my mechanic said it's the aluminum piece which holds the bearings. I don't think it's the bearing themselves.
Prior to this the transmission made funny rattling noise, which I originally thought were the 2 bearings in the clutch cover. They made the noise regardless of the clutch's position. I think from now on I'll just check the transmission oil every 6 months to see if there is so sort of failure.
Luckily the differential is ok, my lightened gear set is ok too . After this I'll stock one spare transmission.
I wish I knew what was the root cause. This 2nd transmission has the same component failure as my last one. I'll try to get some pics when I'm at my mechanic's place.
GTV6sa,
I didn't look at the part which failed yet, but my mechanic said it's the aluminum piece which holds the bearings. I don't think it's the bearing themselves.
Prior to this the transmission made funny rattling noise, which I originally thought were the 2 bearings in the clutch cover. They made the noise regardless of the clutch's position. I think from now on I'll just check the transmission oil every 6 months to see if there is so sort of failure.
Luckily the differential is ok, my lightened gear set is ok too . After this I'll stock one spare transmission.
Last edited by Zamani on Wed Jul 02, 2008 1:43 pm, edited 1 time in total.
Dr. Alban
- twinspark6
- Gold
- Posts: 80
- Joined: Thu Dec 23, 2004 9:07 pm
- Location: san francisco
The sandwich plate has reinforcing webs that support the bearing..Much like superchargers of old,the webs are thin and do break off under normal use.
This will leave a section of halfround ally to float around the box,more critical though is the bearing is even less supported now.
In all the years with Alfa`s Ive probably had 5 such failures..
Never on my own cars though..obviously these were channeled through the workshop..
This will leave a section of halfround ally to float around the box,more critical though is the bearing is even less supported now.
In all the years with Alfa`s Ive probably had 5 such failures..
Never on my own cars though..obviously these were channeled through the workshop..
French cars are shit and shit expensive to service and bloody awful and unreliable and expensive and friends don't let friends drive french cars and you wait years for parts.
Z about 4 years ago I rebuilt my transaxle and at the time I discovered a large chunk of the intermediate plate was cracked and came off in my fingers (see highlighted area) .What I did was fabricate a half-moon brace out of steel similar to the one the factory used which is seen at 7 o'clock in image 1.I didn't take a photo of my fix at the time.My thinking was that this would help stabilize the bearing in this area where the casting was obviously weak.It's been about 60k kms. and many track miles since and so far so good.
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1986-GTV6
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER
Hang on one minute here, Roller bearings??
All the Gearboxes I have come across have angular contact ball bearings with loose inner sleeves, why the h-ll are there tapered roller bearings in your gearbox?
As a theoretical side note: A brace might look like the correct solution but may be counter productive as a very stiff section will take up a lot of the force from the bearing and focus it in a single point like one of the screws. I'm not saying it does in this instance but making it stiffer isn't always a way to make it stronger.
All the Gearboxes I have come across have angular contact ball bearings with loose inner sleeves, why the h-ll are there tapered roller bearings in your gearbox?
As a theoretical side note: A brace might look like the correct solution but may be counter productive as a very stiff section will take up a lot of the force from the bearing and focus it in a single point like one of the screws. I'm not saying it does in this instance but making it stiffer isn't always a way to make it stronger.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
that area looks to be subject to stress from both the bearing, but also the two bolts. Im not surised that area is weak, stress from 3 different directions compounded in a very small area, over time and mileage = premature embrittlement. There is very little material around the lower bolt in the first place. .Im surprised how much porosity there is in this casting though, that is piss poor, even for the early eighties. Are these boxes thoriated at all? anyone got a giger counter?
Good question Mats - one to which I don't have an answerwhy the h-ll are there tapered roller bearings in your gearbox?
This is a 1986 Isostatic link transaxle which has been in my car since I bought it 6 or so years ago.Should I consider myself privledged or was it a production run change - not that Alfa would do that eh!
1986-GTV6
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER
I find that incredibly hard to believe, there would be severe problems when reversing drive on the pinion if you don't have anything to hold it in that direction.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!