251,000 miles huh? So with mine at 250,000 I've got less than 1k to go before this happens?!

Mine is on borrowed time though, last fall it got away from me and overheated, my hoses pressurize fairly quickly now too, but no trace of exhaust in coolant and its not using coolant either. I suspect I have a very small headgasket leak and/or head crack.

__________________


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Hopefully not

Attached Thumbnails

   

__________________
83 300D 328k mi (623) Light Ivory - daily driver
82 300D 166k mi (881) Thisle Green - fixer upper
82 300D 282k mi (473) Champagne - parts

Astute of sixto to request photos of chambers five and six. The pattern of residue on that number five chamber is not good. The residue should be basically spread more evenly rather than only on the one side. If not a crack between the pre chamber and valve seat I do not know what it could be.

Everytime I hear or see problems like this it makes me want to shy away from those engines. There is akways a conflict though. I would also like the additional power they can produce. Old story of I want my cake and eat it too I suppose. Too bad if it is indeed a crack

I'd send it out to Metric to have it checked over and freshened up. No point in putting it back on if its cracked.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Any contact info for Metric?

Well done!

Agreed! Tons of quality ideas and analysis in this thread in just a couple of hours. Man, I love this site.

Thanks, everyone!

I agree.

#5 is cracked between the prechamber and one of the valves. Typical failure point. Sorry........it's not fixable without a replacement head.

Ask for Mike.

http://www.mercedesengines.net/

Tell him I sent you..........and you're from M-Shop.

I see it now! #5 prechamber tip is clean where the others have build-up. Could be a similar effect to water injection in a gasser to 'steam' off carbon.

Sixto
87 300D

I agree with the suspected crack in the #5 hole. Also, it is not the original head gasket, it has definately been off before.

__________________

Gone to the dark side

- Jeff

notice how clean the PC is on #5... you had water spraying into the chamber cleaning off the hot PC. either that or it is a replaced PC... I think I see a crack there too... but it could be just oil marks on the head.
I do not like the water marks on the head around the passages. it looks like rust from the block is accumulating on the gasket material.
sorry.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I had a feeling it had been off before! I found two missing nuts on the exhaust side and worse of all, the threads on the inside of the side rail pins were both stripped.

Brian,

Are you talking about the chip at the 2:30 position of the intake valve? I didn't see that until taking a close look at the close-up. I believe there's a cooling jacket in the head between cylinders.

Sixto
87 300D

Here's what I'm looking at.........between the intake valve and the prechamber.............and I believe it is definitely a crack:

Attached Thumbnails