1995 G320 engine

[G320owner]

Hi there

Our G320 engine needs replacement. Struggling to find one.

Is there a difference between M104.994 engine to the .991 or .992

 

[gsxr]

What is wrong with the engine that it needs to be completely replaced?

M104 bottom end failures are awfully rare.

 

[gerryvz]

My 1995 G320 has a 104.996 engine, which I believe is the variant used on most of these trucks.

Generally speaking, the .996 is the same as the .992 (used in sedans, coupes, cabrios, wagons) with the exception of the oilpan and oil pump assemblies being deeper (holding more fluid capacity). The transmission pan also holds more fluid than a regular sedan transmission. Other than that, there are some minor differences in emissions-related equipment -- my G320 being a European-spec model doesn't have an EGR valve, and is lacking some of the vacuum switchover valves that US-spec engines had.

But mechanically, the engines are very very close variants, yes. The G-wagen uses a different ECU that is specific to the G-wagen, but a sedan ECU can be used if needed. Mechanical parts are generally the same between the variants (i.e. pistons, rods, camshafts, intake system, fuel injection, valve cover, and other running gear).

 

[G320owner]

Check for running rough 1

removed cylinder head as no compression on cylinder 6

Found engine failure due to valve seat fallen into cylinder causing damaged to piston and
Cylinder head

metal particles through out engine which would need to be cleaned as best as possible

May require further parts once completely stripped down

requires rebuild but advise new engine

 

[G320owner]

That’s what the garage have said

 

[G320owner]

My 1995 G320 has a 104.996 engine, which I believe is the variant used on most of these trucks.

Generally speaking, the .996 is the same as the .992 (used in sedans, coupes, cabrios, wagons) with the exception of the oilpan and oil pump assemblies being deeper (holding more fluid capacity). The transmission pan also holds more fluid than a regular sedan transmission. Other than that, there are some minor differences in emissions-related equipment -- my G320 being a European-spec model doesn't have an EGR valve, and is lacking some of the vacuum switchover valves that US-spec engines had.

But mechanically, the engines are very very close variants, yes. The G-wagen uses a different ECU that is specific to the G-wagen, but a sedan ECU can be used if needed. Mechanical parts are generally the same between the variants (i.e. pistons, rods, camshafts, intake system, fuel injection, valve cover, and other running gear).

Very helpful. So it would be possible to replace with a 992 with some extra parts.

 

[G320owner]

Very helpful. So it would be possible to replace with a 992 with some extra parts.

Sorry in my original message I meant ours is 996 too

 

[gerryvz]

Yes, you would have to transplant various parts, including the oil pan, oil pump, and so forth.