Will this head work? - Mercedes-Benz Forum
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post #1 of 17 (permalink) Old 11-24-2014, 12:37 PM Thread Starter
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Will this head work?

Hi, does anyone know if a naturally aspirated head will work with turbo'd engine? I have an '82 300CD which I am pulling the head off of to replace a broken valve guide, I spoke to the guy at the machine shop who said that he has a head from a non-turbo engine that has had a complete valve job, the owner never picked it up. The casting number of the head at the shop is 6170160301.
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post #2 of 17 (permalink) Old 11-24-2014, 02:45 PM
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To the best of my knowledge the casting (that part number) is used on turbo and non turbo OM617s.

However, there is a difference between the turbo and non turbo heads - even though they use the same casting.

The valves in the turbo head are sodium filled (might just be the exhausts) and if I remember correctly they are of a slightly larger diameter.
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post #3 of 17 (permalink) Old 11-24-2014, 09:18 PM
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The Pre-combustion Chambers are different and the Turbo Models have Valve rotating mechanisms for each Valve.
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post #4 of 17 (permalink) Old 11-24-2014, 10:47 PM
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Originally Posted by 300Dman View Post
The Pre-combustion Chambers are different and the Turbo Models have Valve rotating mechanisms for each Valve.
I think that depends on the age of the head. I'm pretty sure after about 1980 the pre-chambers were the same for turbo and non turbo and the valve rotator things were used in the non turbo too.

My '81 non turbo has these goodies. Several of the improvements Mercedes made for the OM617a filtered down to the other non turbo OM61X engines
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post #5 of 17 (permalink) Old 11-25-2014, 08:05 AM Thread Starter
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Originally Posted by Stretch View Post
I think that depends on the age of the head. I'm pretty sure after about 1980 the pre-chambers were the same for turbo and non turbo and the valve rotator things were used in the non turbo too.

My '81 non turbo has these goodies. Several of the improvements Mercedes made for the OM617a filtered down to the other non turbo OM61X engines
Can I tell by the casting number (6170160301) or visual whether the precombustion chambers are the same, or if the turbo ones will fit in the older head? Is there a visual clue whether the exhaust valves are sodium filled?
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post #6 of 17 (permalink) Old 11-25-2014, 11:27 AM
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Can I tell by the casting number (6170160301) or visual whether the precombustion chambers are the same, or if the turbo ones will fit in the older head? Is there a visual clue whether the exhaust valves are sodium filled?
With the head on the bench and not on the engine you have a good chance to find out what has been fitted. You can see the type of pre-chambers fitted by looking at them and then comparing that with the chapter in the FSM.

You do not need a spring compressor to remove the valves in an OM617 - some valves have part numbers stamped in them - that might help. Other than that you can measure them and then compare that data with the specifications in the FSM.
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post #7 of 17 (permalink) Old 11-25-2014, 12:12 PM
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I've just done a quick check for the pre-chambers part numbers =>

PRECHAMBER. CYLINDER HEAD & GASKET KIT for 1983 Mercedes 300 TD TURBODIESEL. #6170100352

617.912 non turbo engines (mine) use same pre-chambers as the turbo 617.951 and 617.952

Do you need links to the FSM chapters or can you find them yourself?
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post #8 of 17 (permalink) Old 11-25-2014, 12:49 PM Thread Starter
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yes, would you send a link? I've got a hard copy ... at home.
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post #9 of 17 (permalink) Old 11-25-2014, 01:05 PM Thread Starter
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Originally Posted by Stretch View Post
I've just done a quick check for the pre-chambers part numbers =>

PRECHAMBER. CYLINDER HEAD & GASKET KIT for 1983 Mercedes 300 TD TURBODIESEL. #6170100352

617.912 non turbo engines (mine) use same pre-chambers as the turbo 617.951 and 617.952

Do you need links to the FSM chapters or can you find them yourself?
Also, do you know if the prechambers are interchangeable, fit wise? In other words would I be able switch mine into the new head?
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post #10 of 17 (permalink) Old 11-25-2014, 01:09 PM
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yes, would you send a link? I've got a hard copy ... at home.
Here you go these are the chapters you need

http://www.startekinfo.com/StarTek/o...617/05-280.pdf

http://www.startekinfo.com/StarTek/o...615/05-280.pdf

http://www.startekinfo.com/StarTek/o...615/05-117.pdf

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Also, do you know if the prechambers are interchangeable, fit wise? In other words would I be able switch mine into the new head?
To the best of my knowledge they are. The FSM at least doesn't mention any problems with changing from the old type to the new. You'll probably have to ream the glow plug hole though.
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