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Author Topic: M 159 as basis for M186 300  (Read 1538 times)

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Offline Henry Magno

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M 159 as basis for M186 300
« on: August 16, 2009, 12:15:21 AM »
On another forum, it was asserted that the 300 engine was derived from a fire truck engine produced pre-war. I had never heard this, but in searching the web I found a piece on eMercedes.com  about the 300 SL:


"A promising engine for further development was the robust M 159, as it was called internally a 2.6 liter six-cylinder unit that had been developed in the late thirties for the new 260 model but did not make it to large-scale production because of the outbreak of World War II. Nevertheless, the engine did not remain at the testing stage it proved itself many times over in light trucks and fire-fighting vehicles. This engine became the basis for a new series. Its originally progressive concept incorporated overhead valves suspended in the cylinder head in V-shape and operated from a camshaft below, as well as a spark plug located in the pent-roof shape combustion chamber between the valves. The engine was designed for a high level of fuel economy and an output of between 60 and 70 hp.

After World War II, the M 159 was taken through several evolutionary stages. It eventually entered large-scale production in the form of the M 186, with an oblique contact surface between cylinder head and engine block, overhead camshaft, large intake valves, combustion space in piston and engine block, a displacement of three liters and an output of 115 hp"

This engine was in the L 1500 truck. Oswald says this engine was an overhead valve, Lewandowski says side valve. It seems a stretch to say that it was the basis for the 300, since it wasn't an OHC, and the valve arrangement in a V wasn't the layout of the 300 valves. Was it in fact a major development from the typical MB engines pre-war?

Comments from the experts on trucks?? Does anyone have pictures or drawings of this engine?

Offline John Ellis

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Re: M 159 as basis for M186 300
« Reply #1 on: August 16, 2009, 07:08:32 PM »
If my translation is correct, this description of the M159 engine in the L1500 chassis seems to describe a side cam, overhead valve engine.

http://et.mercedes-benz-clubs.com/mediawiki/index.php/Typ_L1500A-Motor

Haven't been able to find a picture of the M159 engine.
« Last Edit: August 16, 2009, 07:20:59 PM by John Ellis »
John Ellis
1953 170Vb
1958 190
2007 Porsche Cayman

Offline Henry Magno

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Re: M 159 as basis for M186 300
« Reply #2 on: August 16, 2009, 09:24:33 PM »
I found a picture of an L 1500 truck and it looked like it had a side valve, and another picture that looked like it had a shallow valve cover. The sidevalve engine might have been in an earlier version of the truck.

Offline John Ellis

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Re: M 159 as basis for M186 300
« Reply #3 on: August 16, 2009, 11:47:02 PM »
From further searching, it appears that the M159 engine was used on the military bodied L1500 chassis from 1941 through 1943.  Probably difficult to find any pictures.

We have a member, Hans Rinsma, who collects wartime vehicles.  Perhaps he would know and have pictures of the engine.  His alias is Vorkriegsmercedes.
John Ellis
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2007 Porsche Cayman

Offline vorkriegsmercedes

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Re: M 159 as basis for M186 300
« Reply #4 on: October 17, 2009, 10:02:57 AM »
kind regards Hans

Offline vorkriegsmercedes

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Re: M 159 as basis for M186 300
« Reply #5 on: October 17, 2009, 10:04:21 AM »
kind regards Hans

Offline vorkriegsmercedes

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Re: M 159 as basis for M186 300
« Reply #6 on: October 17, 2009, 10:05:40 AM »
Kind regards Hans

Offline vorkriegsmercedes

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Re: M 159 as basis for M186 300
« Reply #7 on: October 17, 2009, 10:07:24 AM »
kind regards Hans

Offline John Ellis

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Re: M 159 as basis for M186 300
« Reply #8 on: October 17, 2009, 12:46:58 PM »
Thanks Hans, I knew that you would have the pictures .... mystery solved.

Must have taken some special tools to replace the spark plugs
« Last Edit: October 17, 2009, 12:56:33 PM by John Ellis »
John Ellis
1953 170Vb
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2007 Porsche Cayman

Offline vorkriegsmercedes

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Re: M 159 as basis for M186 300
« Reply #9 on: October 18, 2009, 11:32:45 AM »
No problem, good luck!! Hans