Hmmm.
I'm in the process of swapping in an engine from an 83 into an 85... should I keep the 85's IP in the system for the "computer"? I already know I need the trans plate for the tach to work...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

The short answer is no. The computer on the 85 is an idiot, operation of EGR only. Tach signal does run through that "computer" in the pass side kick panel. Tack signal is picked up from the front damper pulley. It will all work OK if the 83 had a three wire tack like the 85 does. That is about where they changed from the two wire to three wire. If the 83 was a good runner with its current pump, leave it alone. If not, now would be a good time to change it, while they are out of the cars. Remember, re-install and re-timing, is not for the faint of heart.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!

Actually for the '85 model year, tach signal is picked up from the flywheel.




As stated the Rack position sensor feeds data for the EGR along with ARV function. Doesn't effect A/C, Kilma and tach operations



.

__________________
1983 123.133 California
- GreaseCar Veg System

I was told at one time that the rack sensor did effect the Klima--causing it to cut out the AC under certain load conditions to more power could go to the drive wheels. Is that not correct?

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Are we doing a quote of the year competition?

If so I think this should be a contender!

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

on the 85, the front damper pulley is for dealer diagnostics only. it has no relation to the tach...
I'm just wondering if not having the IP's rack position sensor hooked up will harm anything. it sounds like it won't.
good, because it's a low mileage, zero stretch on the chain, motor that runs excellent, and I really didn't wanna mess with it at all.

please if anyone has any contrary advice, I'm all ears.
thanks!

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Well, keep us apprised of how well that works out.

__________________
1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002

I was under the impression that the switch on the valve cover cut out the a/c... I do not know anything about the rack sensor.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Yes it's the switch on the valve cover that detects throttle linkage movement and signals the Kilma to cut off the A/C at a point. It's not dependent on load, just linkage movement.


.

__________________
1983 123.133 California
- GreaseCar Veg System

I'll even take pictures!

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!