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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 08-24-2019, 06:17 PM
Nasher16 Nasher16 is offline
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Cracked block

I was wondering since my head was cracked really bad(6 inches and you can fit a fingernail) if my block could be cracked too. Do the blocks crack easily?
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  #2  
Old 08-24-2019, 08:35 PM
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No. The block on your engine is cast iron. Only filling it with plain water and subjecting it to sub-zero temperatures will crack it.
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Old 08-25-2019, 01:36 AM
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Originally Posted by hornhospital View Post
No. The block on your engine is cast iron. Only filling it with plain water and subjecting it to sub-zero temperatures will crack it.
^This^

I can't recall ever seeing a post where there was a cracked block from an overheat. Dozens (maybe hundreds) of cracked or warped heads.
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Old 08-25-2019, 10:19 AM
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You got any ideas? Replaced everything besides rad hoses, tstat housing, rad, and heater core
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Old 08-25-2019, 10:19 AM
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Boiling the coolant too
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Old 08-25-2019, 10:26 AM
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Boiling the coolant too
Nope. Steam is compressible, ice is not and ice is 4% bigger than an equal mass of water.
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Old 08-25-2019, 10:51 AM
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Originally Posted by Doug Huffman View Post
Nope. Steam is compressible, ice is not and ice is 4% bigger than an equal mass of water.


I just put a different rad cap and new tstat and bled it and went and drove it a little bit then thrashed it and itís not boiling over or getting hot. Iíll let you guys know if anything else happens.
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Old 08-25-2019, 03:14 PM
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Sounds like you didn't get it fully bled the first time.
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Old 08-25-2019, 06:46 PM
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It still boils the coolant, just took more time now
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Old 08-27-2019, 06:34 PM
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I used a block tester today and the results were fine. Still blowing coolant out the expansion tank when I stop. Iím thinking when Iím driving the water pump is spinning faster so that keeps the pressure down maybe? Any ideas would be greatly appreciated
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Old 08-27-2019, 07:35 PM
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Maybe it blows coolant out when I shut it off it surges pressure and itís blowing it out to relieve it
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Old 08-30-2019, 01:15 PM
nsguajiro nsguajiro is offline
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Is it running hot when this happens and how hot? When you cracked the head, were there any signs of oil ingress to the coolant system? Heater works?
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  #13  
Old 09-09-2019, 05:32 AM
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Cracked block

Not running hot, heater works great, no signs of oil in coolant system
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