Hello-

If there's a reference for this somewhere, hopefully someone can direct me to it.

Other than horsepower/torque figures, I'm wondering what the difference in the OM617.950, -951, and 952. They all have the same bore, stroke, and displacement, but the HP ratings are 115, 123, and 125.

Were the newer turbos bigger? Different injectors? Something in the injection pump? Can my 116 chassis 300SD by turned up to 123 or 125?

i am only aware of cam shaft profiles being different and the crowns of the pistons.

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-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

Engines after 1980 have a different cam profile for higher airflow that adds the extra 10hp. The difference between 951 and 952 is in the engine mounts and oil pressure sender, they are otherwise identical.

To get it up to 951/2 specs you would have to change your camshaft, tappets and retune your injection pump. Not worth the effort for 10hp.

The oil filter housings are actually different. The electric sender does not fit the 952. There may be more differences to require the need for different 951 or 952 casting numbers on both the block and head.
I have both type engines in my garage to make comparisons.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

Oil sender in 950 was mechanical, in 951 it was electrical. Also, I think motor mounts were different.

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Rev. Dr. G. Church of the SubGenius
It doesn't take a genius

There are also other versions with different horsepower ratings, different IP's and different oil filter housings that point back and down that MB put in their vans.

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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

Is it bad that the only thing to me that's different is "turbo/non-turbo?"

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2003 Volkswagen Jetta Wolfsburg Edition, "Tiffany," - Black/Black Cloth - 75K miles, Jetta #6; my faithful, turbocharged, BBS-adorned sled

SOLD 3/08 1981 Mercedes Benz 300D, "Elise" - Astral Silver/Black M.B. Tex - 217K miles - I miss her everyday; the best-built car I've owned

What van's were they put in?? and does anyone know what kind of GVRW rating they had? If not would you guess?? Where might I find a picture of the oil filter housings??

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46 WDX Power Wagon

84 300TDT daily driver

About as different as old beetle and new beetle.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

A lot of different MB vans. Basically any van with the number XX9d. They put the 616 in the vans numbered XX7d. I don't have a picture of the oil filters but I have owned a couple. Messy to change since as soon as you loosen the nuts, oil starts running out.
They put them in vans rated for at least 4 tons.

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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

Hi
If i install a 1980 cam on my 1979 300D N/A will it increase the HP?.

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1979 300D.

More uninformed questions, what do the XX in xx9d stand for, numbers or letters?? Did they import many into the USA? A rating of 4 tons sounds pretty hefty, I think I want one!

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46 WDX Power Wagon

84 300TDT daily driver

I have a '79 and a '80 617 engine. The '79 always has more power than the '80. Yet they both get the same mileage: 28 MPG

P E H

The early cams were "soft cast" and were matched to soft rockers. If your rockers do not have the hard steel pads on them where they ride on the cam you have the old design cam. To upgrade that you will need to buy the revised cam, a complete set of hardened rockers, and the upgraded cam towers (casting was changed to be stronger for the increased lift and bearing holes are larger to fit the redesigned cam). All are drop in fit to the older engines.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale

Mustang,

I think those hard steel pads on the cam followers are made out of carbide. And the cam is made from chilled iron, very hard but brittle. Don't drop the cam.

P E H