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Old 05-25-2017, 12:54 AM   #26
ZVOLV
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Yep. Happened to me on my 400k mile 240 after a water pump issue.

I popped the head off and, like any seasoned brickers knows, I was unsurprised to find heavily corroded coolant passages and other pits in the head from electrolysis.

The pits were welded up and the head was milled flat.
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Old 05-25-2017, 02:29 AM   #27
smncutler
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I'll have the head off in a few weeks anyway, I'll sort it out then.
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Old 05-25-2017, 08:10 AM   #28
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OP a leak down test applies pressure to each cylinder. You get an indication of percentage of loss + with pressure applied you can easily see if... The coolant level changes in the bottle.... If one cylinder delivers a lot more crankcase vapors to PCV.

Having to add coolant? Oil?

It needs compression, fuel and spark to run. Find which is missing to solve your miss.
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Old 05-25-2017, 11:27 PM   #29
smncutler
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I will rent a leakdown tester ASAP. My oil and coolant are fine.
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Originally Posted by ZVOLV View Post
Yep. Happened to me on my 400k mile 240 after a water pump issue.

I popped the head off and, like any seasoned brickers knows, I was unsurprised to find heavily corroded coolant passages and other pits in the head from electrolysis.

The pits were welded up and the head was milled flat.
How much did the head repair cost?

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Old 05-26-2017, 12:59 AM   #30
ZVOLV
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I wanna say about $200. The thing I have been questioning more and more is, "How much has been milled off over the life if the head?" My bone stock 1990 240 DL has been knocking on throttle-in; the one with a milled head.

I increased the octane and it seems to have helped. I CANNOT SAY if the head job is the reason, but head thickness is something I am going to start measuring.
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Old 05-26-2017, 02:55 AM   #31
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Let's hope I can have a minimal amount milled off and call it good
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