M102 Engine Cylinder head compatibility - Mercedes-Benz Forum
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post #1 of 3 (permalink) Old 04-17-2019, 01:51 AM Thread Starter
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M102 Engine Cylinder head compatibility

Hi all

Just signed up to these forums, having been a lurker for some time.

I have a W123 Coupe which has an M102.985 engine (2.3 out of a late 80`s 190) instead of the original M102.980. Now the M102.985 has a blown head gasket due to overheating - I suspect the head is warped, possibly beyond what a resurfacer can salvage.

I also have a M102.962 (2.0 out of a late 80`s 190) which is a good engine, but I don`t want to lose 300cc worth of screaming performance (!) and was hoping I could use the 962 head on the 985 block to create one good 2.3 engine.

I have the engine service manuals for the M102.985, which states:

"Cylinder head
The same cylinder head is installed on engines 102.9221924 as on engines
102.962/982/985. Only one cylinder head version is supplied as a replacement part. This cylinder head must not be installed on the previous engine 102.961. "

This suggests that I can use the 962 head on the 985 engine, but as far as I know the bores are different, which makes me suspicious as to whether this is true.

Does anyone know definitively if this is / isn`t possible.

Thanks in advance.

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post #2 of 3 (permalink) Old 04-17-2019, 06:31 PM
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If the bores are different, I do not see how the heads would be compatible. Even with the same bores for example a 1990 2.6 will not fit a 1989 2.6 (both M103's) because of the piston shape and the matching valve chamber shape. Been there, done that.

Unfortunately, I have no knowledge of M102 engines.
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post #3 of 3 (permalink) Old 05-01-2019, 07:11 AM
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Originally Posted by jamescross1973 View Post
Does anyone know definitively if this is / isn`t possible.

Cylinder head from 2.0 is not suitable for 2.3.
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