Replacing Engine in 1984 190d - PeachParts Mercedes-Benz Forum

Chewable · #1 09-28-2015, 05:48 PM

I am finally putting the engine from my 1987 190d into my 1984 190d.

The rings were bad when I bought the 1984 car and I really just bought that car for the 5 speed manual transmission. After getting it home it was a much nicer body and had some cooler features than my 87 so I decided to put the engine from the 87 into it.

When I pulled the 87 I took the entire wiring harness with it. Any wire attached to the engine I pulled from the connector - even down to the windshield squirter.

Now there are some differences between the 1984 2.0 and the 1987 2.5. One of the biggest is that that 2.0 had a mechanical oil pressure gauge and the 87 has an electric gauge.
Is there an adapter for this?

There is also all of the EGR stuff as well. I have left all of that wired to the engine and it all came together as one big unit.

I can post some photos later to show the progress.

mach4 · #2 09-28-2015, 05:57 PM

If the two cars have the same cluster, you could just swap clusters. It may be possible to swap just modules too. When I put the OM617 engine (from a W123) in my R107 I swapped the tach module and actually epoxied the tach face plate from the 123 over the 107 face plate.

I'm not familiar with the specific cars you're dealing with so can't offer actual advice, only ideas to try.

Junkyarddawg · #3 09-28-2015, 07:14 PM

The easiest and cheapest way to resolve this is to just put aftermarket gauge pod in the console. Will probably work better anyway as many of these clusters are in need of repairs.

barry12345 · #4 09-28-2015, 07:56 PM

chances are the sender or oil pressure gauge hole is the same size no matter what sender was used. You should be able to just switch the sender with a little luck from one engine to the other.

mach4 · #5 09-28-2015, 08:04 PM

Quote:

Originally Posted by barry12345

chances are the sender or oil pressure gauge hole is the same size no matter what sender was used. You should be able to just switch the sender with a little luck from one engine to the other.

It's very possible that this is not the case. On the 617 engines it's not possible to mount the electric sender on the mechanical oil filter housing due to the physical size of the sender. The solution is to swap in a filter housing from an SD that has the electric sender.

Again, I'm not familiar with the specific two engines in question, but this solution may work there too - at least worth the time to investigate.

TopKnot · #6 09-28-2015, 08:33 PM

the 201.128 from the factory had a different configuration for the radiator because the distance from the firewall to the radiator was too short with the 5 cylinder turbo engine and it's thicker radiator. The lower radiator support is different and in a more forward position, and the top radiator mount is removable. The 201 cars that were built for the 2.6 M103 engines have the engine compartment set up the same way, in 1987 the 2.5 Turbo cars had this different setup but the 1987 2.5 NA did not!

mannys9130 · #7 09-28-2015, 09:51 PM

Just swap the gas/temp/oil cluster from the 87 to the 84.

Make sure the clutch disc isn't bigger for the 602. It may be an inch or half inch bigger.

Chewable · #8 10-03-2015, 11:50 PM

I have the engine in there and I have the basic power connections connected.

I have not hooked up the fuel lines yet I wanted to test the starter. I got some click noises but no starting. This was with the gauge cluster disconnected.

I connected the cluster and the electrical in the car seems to be working, but now I am not even getting a clicking noise.

There is no OVP relay in the 1984. I have the wiring harness from the 87 with the OVP - it is not currently hooked up.

I am not exactly sure what the entire starting circuit should look like for the 1984. I can't find a good diagram.

Has anybody seen one?

t walgamuth · #9 10-04-2015, 07:24 AM

The starting wires should be very similar, I'd think.

If you got clicking but no good start I'd look closely at my grounds....the main negative wire where it hooks to the body, the engine to body ground strap, (should be on the bell housing usually.) ...and any other grounds. Clean them well and make sure the bolts holding them in are tight.

Mxfrank · #10 10-04-2015, 09:18 AM

If the oil pressure pickup can't mate with the same fitting as the electric sender, then the answer is to disassemble the gauge pods and swap the left clusters. It's possible to swap just the oil pressure movement, but it's not as easy as it sounds: you would have to carefully drill both the case and the face. You can't swap speedometers because the calibrations will be different. You also want to maintain your odometer reading.