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Discussion Starter #1
I am thinking on replacing my GTV V6 TB with a 159 1.9 jtdm.
What about the M32 gearbox? Seems to have bearing problems. How bad is it? On all years 159's? Should I avoid the 1.9jtdm because of this issue? Any owners with issues?
Thx
 

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Its not that big a deal its such a common fault across several different car manufacturers that most gearbox specialist can fix it in their sleep. The question is how much you want to spend. You can have a fairly cheap repair where just the end bearings are replaced in situ for a few hundred quid or you can have the gearbox removed cleaned all bearings replaced and re-shimed and the end cast upgraded with bigger bearings for about a grand.
I guess your decision might depend on whether the car is a keeper or not. I am about to go for the full upgrade although i will save about £350 by removing the box myself.
 

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Not all 159s have it. The 2.0 JTDMs don't for example.
I decided to wait for a car that didn't have it so I wouldn't spend every journey imagining a whine.

I guess you need to ask yourself can you take the hit down the road if the worst happens and it needs fixing, or can you hold on and maybe spend a few quid extra for a later car with a stronger box.
 

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I wouldn’t replace it. 159’s are fairly low priced for you possibly to put the V6 GTV in storage or insure both


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Discussion Starter #5
If I can find storage I keep it. Not sure about interest if selling in few years. Has 280000km on it...
 

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Its not that big a deal its such a common fault across several different car manufacturers that most gearbox specialist can fix it in their sleep. The question is how much you want to spend. You can have a fairly cheap repair where just the end bearings are replaced in situ for a few hundred quid or you can have the gearbox removed cleaned all bearings replaced and re-shimed and the end cast upgraded with bigger bearings for about a grand.
I guess your decision might depend on whether the car is a keeper or not. I am about to go for the full upgrade although i will save about £350 by removing the box myself.
not strictly correct, all bearings can be replaced with box in situ and it can be shimmed correctly also.
The end case with bigger bearings also doesn’t stop it happening again it’s just a poor design of gearbox.
They need preventative maintenance to prolong life. Overfill oil using decent quality stuff and change it annually.
 

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I think the more permanent solution is to upgrade from the M32 to the F40 box (which I believe is what the 2.4jtdm / 2.0jtdm use from the factory).

There are lots of posts on vauxhall forums about people upgrading to the F40 on 1.9 Vectras etc.

It looks like all you need is a working secondhand gearbox, drive shafts, a new flywheel and clutch. Without meaning to hijack the thread, presumably this can be done to the 1.75 TBI as well as they all use the same M32 housing?
 

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Discussion Starter #8
Seems that far most of the problems I find about the M32 are Opel/Vauxhall related. Maybe Alfa uses better oil.
 

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Seems that far most of the problems I find about the M32 are Opel/Vauxhall related. Maybe Alfa uses better oil.
I think you are drawing that conclusion simply because there are more Vauxhalls out there with this gearbox, seeing as it's a Vauxhall part, so naturally a greater number of issues arise on Vauxhall cars. However, the percentage of M32 gearboxes that experience issues I expect to be roughly the same on both Vauxhall and Alfa cars.

The F40 I believe is also a Vauxhall gearbox, but doesn't display the same bearing problems. As the Brera / 159 were both fitted with the F40 on the their larger diesel engines it should be easy enough to source matching driveshafts and a gearbox for your car should you wish to upgrade permanently. Alternatively, the bearing overhaul can be done for a cost of about £500 - £1000 at most garages and very broadly speaking should keep the gearbox going for another 50k miles or so, providing you don't do track days.

I know very little about gearboxes but I understand the issue with the M32 gearbox to be less related to shear torque or power being transmitted, but more related to continued wear and tear over time. Therefore the age-old idiom "they all do that" I think unfortunately is true.
 

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The M32 is actually made by Getrag. The F40 was developed by GM for Opel, Fiat and SAAB.
 

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How about gear ratios when you update from a M32 to an F40 gearbox?
I suppose the different Diesel and Petrol engines use different gear ratios.

Does anyone have a listing of the gear ratios for each engine?
 
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