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07-12-2019, 07:34 AM | #21 |
Senior Member
Join Date: May 2010
Location: Northeast Pennsylvania
Posts: 1,582
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Re: 8BA block concern
Before you get radical with disassembly, pull the center bolts and apply Permatex #2 to the threads. Reinstall to normal torque. Let it set up overnight and test it again.
Do a compression test. If the center cylinders are low, then you may have a crack in the exhaust runner that goes up into the valve seat. Another test is to run the engine with a spark plug removed (one at a time!) in the suspect cylinder. If it belches steam or droplets, you found the problem. |
07-12-2019, 08:31 AM | #22 |
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Join Date: Apr 2015
Location: Sweden
Posts: 3,045
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Re: 8BA block concern
The blocks has a bad habbit of separating in the thread of center exhaust runner...weaping coolant down into the exhaust.
Longer threaded stud and sealer fixes that issue... |
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07-15-2019, 07:37 PM | #23 |
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Join Date: Dec 2015
Posts: 547
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Re: 8BA block concern
So I started out pretty sure the center headbolt was leaking. As the first photo shows. But then when I go back and look at #7, it looks like it’s wet around the guide but I cannot tell for sure. The block was magged thoroughly so I am surprised by that if it is.
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07-15-2019, 09:13 PM | #24 |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: 8BA block concern
If you're looking for cracks it is best to pressure test the block, mag doesn't get everything.
Last edited by JSeery; 07-15-2019 at 09:22 PM. |
07-24-2019, 07:14 PM | #25 |
Senior Member
Join Date: Dec 2015
Posts: 547
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Re: 8BA block concern
We pulled the center bolt tonight and resealed it. Going to let it setup overnight before we refill with coolant. I have the GM seal tabs to add for the leak test.
JB |
07-30-2019, 02:50 PM | #26 |
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Join Date: Dec 2015
Posts: 547
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Re: 8BA block concern
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JB |
07-30-2019, 04:11 PM | #27 |
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Join Date: Jan 2011
Location: Central Ohio
Posts: 5,068
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Re: 8BA block concern
Great News! That crack is so common that some of us believe that Ford gave it a 'Part Number'! LOL
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