hey guys, just came from the machine shop. my otherwise good running head has 4 out of 5 cyl cracks in the head at the prechamber. is this common? im gonna go to the junk yard to find another head tomorrow. hope this new one is better! my #3 cyl had 2 cracks!! what is the main cause? leaky injector?

Well are we talking about a Nailhead Buick? An IH 6.9? BMW M106?

Please provide more information.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I have an extra cylinder head from OM617.952 engine. It was hot tanked and the machine shop says it does not need to be resurfaced. $100 plus shipping. Shipping is $104.50. PM if interested.

If it is something with an Iron Head I would say the the most common cause of cracked Heads is overheating.
On Trucks pulling an excessive load in the wrong Gear (lugging) over time can create localize stress that can crack Iron Cylinder Heads (more typical with Detroit Diesels). Lugging causes the Cylinder Pressure to shoot up.


If it is an Aluminum Head they crack due to design issues and warp and crack more easily due to overheating than the Iron Heads do.
On My Volvo Diesel with an Aluminum head certain sized cracks between adjacent the Valve Seats are allowable.
And, my Head has such cracks and I have been driving it like that since about 1992 with no issues.
You cannot jet on down to the Junkyard and get a Diesel Volvo Head. You can with a 617.

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84 300D, 82 Volvo 244Gl Diesel

If the OP bothered to read the forum rules before posting, you wouldn't need to write a dialog attempting to provide answers for every possible M/B diesel engine ever made.


http://www.peachparts.com/shopforum/diesel-discussion/295403-thread-rules-please-read-before-posting.html

He has a 617 in a Hilux.
Even I was able to work that out!
I do agree it would be useful if members could put some info in their signature.
Not a sack-able offense though.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

Putting one's car year/model in our signature ought to be made a requisite for sign up to the site. It's why (MB's in general our own in particular) we're all here in the first place one would think.

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'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.

That's because you're a genius. Everybody knows that.

i got a 1985 300d head just laying around any idea if it would fit a 1984 300sd?

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800

I have to wonder about doing any further work to an engine with a head in that condition. When you find a good head, take the rest of the engine with it.

Sixto
87 300D^2

I wish drayday55 would get back to us and make some comment?

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84 300D, 82 Volvo 244Gl Diesel

You guys are right. Sorry I should have stated what model. It is a 617.952. The motor came out of a 300d that drove well but had grease run through it for a few years. I got the car running and thought it was a good donor for my toyota 4x4 swap. Only thing I notice after reading some other posts is it had oil in 4 of the 5 cylinders. I thought the injectors were leaking and causing the carbon to liquefy but I was wrong. Im guessing it was from these cracks around the prechamber hole.
The motor is still on the engine stand and I do need to get a head. I may go to the junk yard. But I may take up Greazzers offer.

Anyway. I appologize. I thought most of you guys have a 617. Don't see many other Mercedes diesel's in socal

Pictures send by email.

PM me.

Thanks,

As long as you're that far into it, pull the pistons and see what the grease has done to the rings.

So there is no parts mix ups there is also 617s that are not made for a Turbocharger. While the Exterior looks similar the innards and the strength of the Turobed model is different.
Look on the side of the Block that the Fuel Injection Pump goes at about the Middle top of the Block you will find the Engine Number. Post that here if yo will be getting some Parts from Our Members.

I live in Long Beach, CA and there is quite a few of the Mercedes Diesels from the 1980's in my immediate neighborhood; a lot of Gassers to.
Over 1/2 of the population in my area of Long Beach is Asian (that includes my Wife who is a Naturalized Citizen). They are mostly the ones driving Mercedes.

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84 300D, 82 Volvo 244Gl Diesel