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  #1  
Old 02-23-2003, 02:10 AM
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240D cracked manifold?? pictures

Looking at a 79' 240D that has a cracked exhuast manifold in two places. The cracks look like they are completely through on 1 and 4 cyl.
I do not know the history of the car but the previous owner thought it had a bad head gasket. Engine has 260k on it and has not run for a year or two.
Any suggestions on start up after it's nap and where and how much are replacement exhaust manifolds. Do they crack often?
I did a search and found one guy runs his cracked without problems other than soot in the engine bay.

Newbie to Mercedes

thanks bennett
*update* pictures are down a few posts**


Last edited by bennett; 02-23-2003 at 02:15 PM.
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  #2  
Old 02-23-2003, 08:44 AM
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I'd pull all four injectors and squirt a little atf in there and let it sit over night. After sitting I would then crank the engine over to blow it out. Supposedly this will loosen up stuck rings which it may or may not have. You will probably want to replace the fuel filter and make sure the fuel that is currently in there is still usable.

You should be able to pick up a used manifold at a pull a parts place or post it on parts here and someone may have a spare sitting in their garage. I may have an extra one in the shed - I'd have to look. I can't say I have ever heard of one cracking on these cars.
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  #3  
Old 02-23-2003, 10:05 AM
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bennett,

Agree with engatwork's recommendations. About that crack though, I have yet to see a cracked exhaust manifold on one of these cars. Where is it cracked?

I tell this tale often, but I think it has relevance, so I feel justified. Anyway, my 1982 240D engine mounts failed, and I mean failed. The driver's side mount was split in two and it would allow the engine to lift and bang around when the car was being started. Over time it did a number of bad things, and one was it stretched the exhaust manifold to head fasteners to the point where the exhaust manifold was loose. The intake and exhaust manifolds on these cars fit together a little like a jigsaw puzzle at the head, and share fasteners in certain positions. Since the intake was just going along for the ride in all this banging around, the couple fasteners that only hold down the intake manifold were still tight. When the exhaust manifold got loose it looked like there was a crack in the part of the jigsaw puzzle fit where the intake and exhaust manifold joint was partially covered by the fastener, and yes, exhaust would shoot out.

Upon further inspection, there was no crack, it is a joint line, as the spot I thought was a crack was really where the intake and exhaust manifolds were sharing a fastener. I replaced the fasteners and the gaskets, and all was well.

The point of all this is to have you make sure the "crack" is not at the joint to the head. I hope this helps. Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #4  
Old 02-23-2003, 10:29 AM
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I am pretty sure the exhaust manifold is cracked through. The cracks appear at the bend just after the outlets on the manifold.
I will double check and post a picture later today.
I am thinking the PO was correct on blown head gasket. I can see that the water pump appears to have been leaking at the weep hole on the top side. The car is from Vegas andt there are lots of "surfer" stickers on the rear window tells me kids probably drove this and ignored the temp of the overheated the vehicle.
What should I be looking for on a overheated 240D besides the water pump and headgasket problem? Do the heads on 240Ds warp and need to be surfaced? I assume fastlane would be the best source for parts?
Thanks for the replies ...you will be hearing more form me as I dive into the benz.

Bennett
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  #5  
Old 02-23-2003, 11:08 AM
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Those engines can take allot of abuse, but surfers......
what are you going to pay and is it manual or auto tranny?
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  #6  
Old 02-23-2003, 02:09 PM
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Here is a pic of the cracked manifold on last cylinder. The first one is the same.
They are cracked all right...anyone else chime in on why that happended? Motor mounts look OK.. do you think the overheating caused it? Will the overheating warp the cast iron head?
Attached Thumbnails
240D cracked manifold??-mercedes-002a.jpg  
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  #7  
Old 02-23-2003, 02:13 PM
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Didn't know how to post two pics so I thought I would just post another.

Thanks for the help.
Attached Thumbnails
240D cracked manifold??-mercedes-001a.jpg  
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  #8  
Old 02-23-2003, 02:53 PM
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bennett,

I would say you described the situation accurately - that is a cracked manifold, and I am curious about how it cracked like that. You should not have too much trouble finding another one at a junk yard.

I used to change the water pump on my 240D about every 70,000 to 90,000 miles. So, if yours is leaking it may just be old. Using non-MB coolant antifreeze will accelerate the demise of a water pump too.

What are the symptoms of the head gasket failure?

Good luck, Jim
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #9  
Old 02-23-2003, 03:41 PM
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Location: central Texas
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I would like to suggest that the first rotation of the engine after putting in the oil or atf should be by hand on the front crank bolt..less chance of breaking a stuck ring than engaging the starter.. no way to "slowly" engage the starter...
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  #10  
Old 02-23-2003, 06:21 PM
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I agree with Greg - turn it over by hand a few times first.

On the cracked manifold - Something ain't right for it to crack like that. Either someone screwed up torquing or it is head/gasket related. If it is not from improper torquing then there were some EXTREME temperture differences. Best case if the latter, plan on just having to replace/repair the head, worst case - lower end rebuild.

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Last edited by engatwork; 02-23-2003 at 06:27 PM.
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