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Old 12-13-2016, 12:08 AM   #1
imolarot3
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cracked block behind water pump

my water pump failed which caused my mechanical fan to fail which flung fan blades into my radiator and hoses. i got new everything but then when i took off my old water pump the block behind it is cracked. can't simply get new block so i may weld / jb weld / ...? any advice would be greatly appreciated. 2001 M3
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Old 12-13-2016, 12:48 AM   #2
BaliDawg
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Holy crap, that looks bad. May have a junk motor now. I am assuming you had a serious overheat?
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Old 12-13-2016, 01:05 AM   #3
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Try welding a bead and grind it down it should work, its no more than 16psi

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Old 12-13-2016, 01:05 AM   #4
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Worth a try if replacing the whole block

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Old 12-13-2016, 01:32 AM   #5
Jason325xi
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If that happened from over heating you might have other problems like a head gasket/warped head. Did the car overheat or did you shut it down in time? Either Way i don't think jb weld is guna be the way to go. If you try to weld it at least groove it out a little bit.
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Old 12-13-2016, 08:17 AM   #6
erehtuo
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Do you have any pictures to show a wider view?

The M3 could be different then the other inline 6's but the water pump bolts up to a separate piece I believe. You may be able to replace just that piece, I think its the timing cover.

Check out this thread
http://forum.e46fanatics.com/showthread.php?p=14238211
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Old 12-13-2016, 09:40 AM   #7
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When was the last time the wp & clutch fan were changed. They need to be changed at the same time.
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Old 12-13-2016, 10:45 AM   #8
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Your going to need this part wielded . Would suggest that you find someone who is experienced with wielding aluminum and have the car towed to them, unless that have a rigg to bring the equipment to you.
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Old 12-13-2016, 11:51 AM   #9
imolarot3
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Its a cast iron block in e46 m3. I will most likely go with this option (welding) to try to salvage my motor. Car didnt overheat, will attach wider angle photo later
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Old 12-13-2016, 11:53 AM   #10
imolarot3
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If anyone knows of trusted welder in the area please let me know. I can tow within hour radius of chester nj 07930
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Old 12-13-2016, 12:12 PM   #11
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Quote:
Originally Posted by imolarot3 View Post
Its a cast iron block in e46 m3. I will most likely go with this option (welding) to try to salvage my motor. Car didnt overheat, will attach wider angle photo later

good luck welding cast iron...
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Old 12-13-2016, 12:28 PM   #12
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Its a specialist job welding cast iron. You cant go to any old welder the block might need to be pre heated to stop it cracking further.
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Old 12-13-2016, 12:59 PM   #13
imolarot3
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Cant find anyone to do it. May have to swap new complete motor or sell. Sucks i just installed afe exhaust rogue short shift h&r springs bilstein shocks str wheels tires mishimoto fan and radiator...
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Old 12-13-2016, 01:06 PM   #14
pack horse
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Contact a classic car restoration specialist they might be able to help.

There used to be a technique called "stitching" to fix cast iron blocks.
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Old 12-13-2016, 01:30 PM   #15
Eeavaldez
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I have a spare block

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Old 12-13-2016, 01:59 PM   #16
P_dog89gt
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I too thought that was just a timing cover behind the pump and not the actually block.
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Old 12-13-2016, 02:08 PM   #17
Jason325xi
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To weld cast it will have to be pre and post heated. It's say you definitely want to find an experienced welder. Are you liking for a welder at an auto shop? Might want to look for a dedicated welding shop.

Edit: so if it didn't overheat, it apparently happened from the pump and the fan blades failing? I wish i was close to you, i welded a cast iron part on my dad's Subaru legacy a little over two years ago and it's still holding strong to this day. Hopefully it's a timing cover that can just be swapped out as said above. That would be way less of a pain in the a$$
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Last edited by Jason325xi; 12-13-2016 at 02:32 PM.
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Old 12-13-2016, 03:13 PM   #18
imolarot3
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Not a cover its the block. Found motor for 2500.. need to find way to justify swap.. performance mods that require engine to be out?
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Old 12-13-2016, 03:25 PM   #19
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wider view picture?
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Old 12-13-2016, 05:43 PM   #20
imolarot3
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