I have seen an OM636 once in a sailboat. At the marina I worked at we just couldn't get parts for them, anything more than basic filters.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

The 170s were the w136 chassis and were made before WWII and was the first car MB started making after the war. The pre-war models have a wood frame, while the post-war(1952-53) models have a steel frame. You will see models labeled 170D and 170DS, the "S" refers to the steal frame.
Here are a couple of links I found a while back-
http://en.wikipedia.org/wiki/Mercedes-Benz_W136
http://www.west-4x4.demon.co.uk/om636/170D.html
I love these cars, I bet it's nearly impossible to find parts for them though.

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IIRC the engines in the 170's were the OM636, the same engine also used in refrigeration units and boat motors.
Please no boat anchor jokes.

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DJ


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

They used the same engine in the w120 180D's from 53-61. And I have read too about them being used as refrigeration units and boat motors.

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Nope, they all had a full set after the OM636.

I have a pair of OM636 engines in my sailboat and I just noticed the overflow tube on the injector is leaking. I am hoping it's a quick fix. Yes, hoping. It runs really good, but it seems to take a while starting. I am new to this diesel maintenance so any help would be greatly appreciated. Even just a link to a service manual (not just blow up pictures and a list of parts - but a good service manual please)

Why would it be leaking and how would I fix it?

Thanks - I'm sure this won't be the last time you hear from me ;-)

John
S/V Stone Age

I had a fuel leak from a banjo bolt/crush washer setup. Took the whole assembly apart, cleaned everything with brake cleaner and wet-sanded the crush washer with 600-grit paper to smooth finish. Leak stopped. You might try this, since it doesn't take much time (20 minutes?) and no parts are needed.

Edit: also found this website,
http://www.west-4x4.demon.co.uk/om636/marine.html
UK marine diesel specialists.. maybe you could call them if you need parts.

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Tomas, Sweden
1966 Mercedes Benz 230S with OM617.912, automatic. Disk brakes from W108
1983 Mercedes Benz 300TD grey, OM617.912 and 5-speed manual
1983 Mercedes Benz 300TD blue 7-seater, OM617.912 and 5-speed manual

I did some quick searching and found these pages that talk at least a little about the OM636:

http://www.west-4x4.demon.co.uk/om636/om636e.html

http://en.wikipedia.org/wiki/Mercedes-Benz_W120/121

http://www.mbzponton.org/valueadded/technical/techdsl.htm

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

Did an internet search it appears that OM636= 180D.
http://www.west-4x4.demon.co.uk/om636/180D_files/
http://www.west-4x4.demon.co.uk/om636/180D.htm
This last one has a pic of the marine enigine.
http://www.west-4x4.demon.co.uk/om636/marine.html

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84 300D, 82 Volvo 244Gl Diesel

Hello mercedes shop people, I have recently bought a motor sailer with a Merc OM636 (I think its about 40 to 45HP). nice engine, runs fine. however before I go long distance I need to become more familiar with its workings, so I need a workshop manual, I am finding it very difficult to obtain one, any ideas for sourcing same would be greatly appreciated? Regards, Ian Ducane.

We have a Storebro mahogany boat built in 1962. It has two inboard Volvo Penta MD4 engines wich is actually Mercedes Benz 180D ( a.k.a. OM636) converted to marine use. The oil pressure on one engine rises very slowly after starting and reaches 5 kg/cm2 after approx. 10 minutes. When running at 1500 rpm, it then decreases to 1,5 kg/cm2 after 10-15 minutes, wich is the point where I have turned it off and returned home on only one engine. I´m using 20-50 mineral oil. I have found info on the internet saying that oil pressure at idle speed (750 rpm) must not be lower than 0,5 kg/cm2, but what about running speed att 1500-2500 rpm? I believe that the slow rising of oil presssure is caused by failing oil pump or maybe just dirty sieve under the pump, but lifting the engine is a big projekt. Can we keep going? How close to disaster are we?

RE: OM636 Engine Crank Bolt-Head Size?
Model 180D
Year : 1958


Hey,

Perhaps this is obscure to a majority on this forum, but I was wondering if anybody can tell me the size of the bolt-head that is on the end of the main crankshaft at the front bottom end? The one I need to put a socket on so that I can turn the engine and see if it moves free?

On a related note, should I expect most bolt-heads and nuts be in metric units, or american/english-inches? This will help me in targeting the socket set I want to get for working on this vehicle.

Thanks Much

The OM621 was a "clean sheet of paper" design - it was state of the art thinking... in 1957.

I'm not sure why you used the smiley icon? but the engine that preceeded the OM621 was the OM636, used in the 180D.

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98 Dodge-Cummins pickup (123k)
13 GLK250 (135k)
06 E320CDI (323K)
16 C300 (62K)
82 300GD Gelaendewagen (54K)

Excerpted from Paper 780633, SAE: "The Turbocharged Five-Cylinder Diesel Engine for the Mercedes-Benz 300 SD" by Kurt Oblander, Manfred Fortnagel, et al, Passenger Car Development Division, Daimler-Benz AG: June, 1978: presented at the Passenger Car Meeting, Society of Automotive Engineers, Troy MI:

i think these guys would know. The "patented cooling arrangement" also goes some measure toward explaining the non-cross-flow head feature. A brief review of the water jacket diagram in the paper <30 PAGES!!! of technical FACTS> will inform, I think. It would have been quite challenging to build a cross-flow head using this cooling arrangement.

The authors also do a fabulous job of highlighting all the design changes from OM 617 to OM 617a, and their research/reasoning of same.

--frankb

I have a friend (hard to believe, but yes, I do) who purchased a 1959 MB 190D, what would be called a 190Db. It has the OM 621 engine in it. When it was delivered, the starter seemed loose and he discovered later that the starter was for a 1983 240D.

Well the seller is apparently attempting to get him a starter but my friend discovered that in a certain number of 190D cars, there's an offset in the Zwischenflange, the intermediate steel gasket between the starter motor proper and the engine. He finally obtained one of these and discovered that his starter uses a very particular nose part, with Bosch designation 46E5. The starter he has is designated 46E32.

We are now looking to see if a OM636 starter will fit this 190 because we're having so much trouble finding the starter with this particular nose. If you didn't know the OM636 is the diesel used on the 170 and most 180D diesels. A few 180s and all 190s that were diesels got the later engine, called OM 621, used in the 190D cars and the 200 D heckflossen of the 1960s.

What I need is for a starter aficianado OR someone with a lot of time on his hands OR someone who has the inside track to the Bosch data bank to identify if:

1. The 180D starter will fit on the 190Db with OM 621 motor
2. Which other starters used the nose marked 46E5 ? What are all applications?

The guy who sold him this car is apparently notorious for taking the money and running. He's new and found this out too late. My friend also found a guy with two of these starters and tried to call him, only to find that the original seller of the car is attempting to corner the market on these, to get a little more money out of him. Nice guy, huh?

So, guys and gals, dieseler and dieselettes, can anyone help answer these questions?

Thanks,
S