156 2.4 20V engine in late 10V shell? - Alfa Romeo Forum
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156 2.4 20V engine in late 10V shell?


Not been on here for some time but I'm planning a bit of a rebuild on a 156. I have a 2002 156 2.4 10V (facelift dash) Sportwagon with a good shell, and tired engine.

I have recently bought a 2.4 20v, but it's very rotten underneath, and the bodywork isn't as good as the 10V either.

I know all the running gear from the 20V will bolt into the 10V shell, but as far as the wiring goes, is everything engine related on a separate engine loom that plugs into the main car loom? In which case the swap can be done.

I would assume it can as the car looms will also have to accomate the JTS engine so should be a case of swapping everything over. I've rebilt quite a few cars, modern and classics and done engine conversions, but I need this to be a straight swap without having to chop wiring!

On another note, although the GM box in the 20V works fine and has a recent new DMF and d/shafts, will the Alfa 10v 5 speed or the 1.9 6 speed fit? I'm assuming the 20V bottom end is the same as the 10V, so could I fit a 10V flywheel and clutch to the engine and the Alfa box? Not a major thing right now, I just know the GM box and the d/shafts particularly aren't considered to be great.

Thanks in advance for any info!

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156 JTD 2.4 20V

Thats going to be tricky as I would think you would need to transplant the whole 20V wiring loom and ECU as they are very different to 10V. There is no separate "engine" loom as far as I am aware. Also, the 20V would destroy the 10V gearbox and shafts even if you could get them to fit.......

The GM box is indestructible (albeit notchy) and the driveshafts are not as weak as reputation suggests! If the DMF and drive shafts are recent then I would have thought you would be much better getting the 20V sorted with welding :-)

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I don't think the 20v would destroy the 10v gearbox & driveshafts. The 10v gearbox is a tough old unit, and also very nice to use. Clutch/DMF is a weakpoint but half the price of a 20v clutch/DMF so it might be a sensible swap. The 1.9 6-speed box seems a little more fragile than the 5-speed in the 10v even though they are the same design - I guess its down to the longer shafts inside the gearbox increasing the forces.

As for driveshafts, the old-style driveshafts in the 10v don't have many problems. Later type spider & cup driveshafts as found in the 1.9 8v/16v and the 20v are known for inner bearing failure which eventually wears out the cup.

It wouldn't be an easy swap though. There is no engine loom at all on the 10v, its a single loom that comes out of the bulkhead and plugs into all the sensors/electrics on the engine, as the ECU is in the passenger footwell. Off the top of my head the 20v does have a detachable engine loom as the ECU is in the engine bay but I am sure there is also another loom that heads into the bulkhead.

I would just put another 10v engine in it, I think they are nicer and more reliable engine than the 20v anyway (have had 5 x 10v in the last decade and more recently a pair of 20v 156s)

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10v , 156 , 20v , engine , late , shell

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