I've just about finished with the 300SDL engine in the 350SDL. I noticed the harness at the bottom of the rear of the injector pump is 3 pin on the 300SDL, and on the 350SDL harness, it's a 5 pin connector. Any ideas what I should do? I guess I can take apart the 350 harness, and manually repin it if I have matching colors. But should I remove that white connector on the back of the pump and transfer it? If so, is that something that can be done with the engine in the car? I'll take some pics, and post them so you can see exactly what I'm referring to. Thanks!

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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D

Pics of both harnesses of a 300 and a 350. The 6 pin, or 5 actuall used pins is what the harness side of what I have is. The 3 pin is what's on the IP.

Thanks again.

Attached Thumbnails

   

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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D

That is the A/C cut-out micro switch. Nothing to do with the IP.

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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

What Greg said. Can't you just transfer the switch?

Sixto
87 300D

I guess I can switch it, but if all it does is interrupt the signal to the compressor coil, I'm not going to bother. I drove it today near the Blue Ridge Mountains for about an hour with the AC running, and no problems. But, if it's needed for another reason, I can switch it. The other thing I noticed is the indicator light for the GP's just stays on until I start the car. I used the 350 carside harness including the relay, and used the 300 engine side harness. There is an extra pin in the relay for the small plug. 5 pins on the 350, 4 pins on the 300. I plugged the 350 carside harness into that, so that matched. But, on the carside, there is one green wire that is included that terminates to a pin. The 350 uses 2 wires in that position. One green wire, and a white wire. I plugged the green wires together, and it works good, except for the indicator light not shutting off until I start the car. So, there is nothing hooked to the white wire on the carside harness. I'm figuring it has to do with the afterglow on the 350, but I didnt think it would influence the indicator light.

All in all, it was a fairly straight forward swap. Some different vac lines, but if you take the time to study where they terminate, it's not bad. I didnt realize that the old 350 engine was that much louder than the 300 low mileage engine. The 350 engine ran fine, and had plenty of power, but just rattled a bit more. Never noticed it until this engine was put in it's place.

Thanks to all, especially Sixto.

As far as what I verified needs to be changed...

Compressor bracket needed to be swapped from the 350 to the 300 block if you want to use the 350 compressor, the 17c.

Alternator had different wiring attachments on the back. So, I swapped that over.

Used the longer 300SDL belt, 845K6. 835K6 was just too tight to make it. An inch here made all the difference. I thought I would have to use to shorter belt with the 350SDL, but nope.

My car did not have the SLS option, so the power steering pump wasnt an issue.

I think that was about it. If anyone has any specific concerns about this swap, feel free to contact me.

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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D

The 5th pin in the glow relay is for a coolant temp sensor. It goes in the head tucked behind the IP. If the 350 doesn't have a BFS, there should be a spot ahead of the coolant thermostat where the 300 has the BFS 50*C switch. The glow relay temp sensor is $12-15. Depending on how the harnesses mesh, the 50*C switch wire should end close to the glow relay anyway.

Sixto
87 300D