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Old 02-28-2002, 05:56 PM
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cracked alum. block

i have a european 500SEC with a small crack in the engine block near the oil filter housing (happened in a wreck). this happened before i bought it and they epoxied the crack which seemed to work fine for approxinately 100,000 miles (now has 139k). howver, it's leaking more and accidentally overheated which may have blown the head gasket since it now runs pretty hot.......i'm not driving it beacause of this.

my question is how to fix this. should i just shop around for a used engine? the present engine has new timing chains and injectors, but i worry that perhaps the head could have sustained damage (although it runs fine....just overheats). is it possible to weld the aluminum block (and then just fix the top end)? i have been told (hypothetically) that you can't weld those blocks even though it would be a fairly small area. i have taken very good care of the engine since i've had it (ie- frequent oil changes using synthtic oil) and would rather fix what i have if possible. on the other hand, i don't want to spend more than about $6,000 to fix it when it appears that i can get a used engine for less than $2500.

i'd appreciate any advice.......thanks

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Old 02-28-2002, 08:52 PM
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No one's responded to your info request so I will give you my opinion. I certainly can't comment on whether or not the block can be repaired or comment on what other possible damage has occured due to overheating. I would say that if you can get a good used motor for $2500 I would seriously look at that option. Get an independent to quote on examining your motor and make a decision from there. You can certainly keep your existing motor for parts if things like the timing chain etc are worth keeping. Good luck with what you decide to do.

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Old 03-01-2002, 01:03 AM
Ashman's Avatar
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Join Date: Sep 2000
Location: Sherman Oaks, CA
Posts: 4,748


Satish put a 32 valve M119 V8 from a 500SL in his 560SEC.

'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.
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Old 03-01-2002, 01:22 AM
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Satish's car is very cool, but it cost him a little more than $2500 :-)
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Old 03-01-2002, 09:08 PM
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Join Date: Oct 2001
Location: Western Mass.
Posts: 324
Have you shown the crack to a certified welder.? It seems like worth a try to heli arc it if the location warrants it. That just my .02 Spend a $100 for the weld and maybe not $$$ for an engine.

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
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Old 03-01-2002, 11:59 PM
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Join Date: Jul 2000
Posts: 638
cracked block?

Why not clean the area well with chlorinated solvent and re-expoxy it? To weld (really heli-arc is the method to use) requires good clear access--which may require removal.

Regarding overheating, I suggest you have the radiator rodded out and replace the thermostat.
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Old 03-02-2002, 01:08 AM
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to all who have replied so far....thanks!!!

i am a doc at a local university hospital and haven't had much time to devote to my true love.......working on cars. this site is a refreshing reminder of the comrade of those who love them. i will follow this thread for all the kind suggestions offered.

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Old 03-02-2002, 09:48 PM
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Talking Doc...

WARNING: I think you caught the MB fever! Unfortunately, there is NO CURE.
'86 300E
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