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05-12-2017, 06:31 AM | #1 |
Junior Member
Join Date: May 2010
Posts: 11
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flathead issues
Blew the head gasket #4 on my 8BA engine with aluminum heads. Had antifreeze pouring out the exhaust. Replaced head gasket using copper, Used thread sealent on bolt threads retorqed to 50# all acrording to the book. Engine runs great now but when it comes down to idle alittle white exhaust starts coming out the tailpipe. I don't notice it when driving down the road, only at idle. Any ideas? Thanks, Dave
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05-12-2017, 06:49 AM | #2 |
Senior Member
Join Date: May 2010
Location: Kokomo, Indiana
Posts: 1,731
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Re: flathead issues
Warped head? Cracked block? Wavy deck on the block? Would have to do some accurate measuring / checking to tell for sure.. Good luck.
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Henry |
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05-12-2017, 06:55 AM | #3 |
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Join Date: Sep 2011
Location: Christchurch New Zealand
Posts: 1,603
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Re: flathead issues
Have you been through 3 torque cycles oon heads. Maybe try another torque cycle first.
Phil NZ |
05-12-2017, 08:02 AM | #4 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: flathead issues
As Henry stated, if you didn't check the heads, block mating surface or inspect for cracks, it will be very difficult to determine what the issue might be now.
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05-12-2017, 07:51 PM | #5 |
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Join Date: Oct 2011
Location: Gloucester VA
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Re: flathead issues
You could have a coolant pool in your muffler that needs to be cooked off with a long drive.
Lonnie |
05-13-2017, 05:51 AM | #6 |
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Location: Auburn, MA
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Re: flathead issues
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“The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound |
05-13-2017, 06:28 AM | #7 |
Junior Member
Join Date: May 2010
Posts: 11
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Re: flathead issues
I went through the 3 torque cycles trying to do everything right. Exhaust was full of antifreeze. Engine is cooling great, level in radiator is not dropping, oil is clean. Just seems not right to do this in idle. Will get out this weekend and drive. Thanks!!
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05-13-2017, 08:34 AM | #8 |
Senior Member
Join Date: Dec 2014
Location: Miami Oklahoma
Posts: 535
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Re: flathead issues
Might use a block test Kit to see if there are hydrocarbons in the cooling system. Nice tool for small leaks that are not obvious.
https://www.napaonline.com/en/p/BK_7001006
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Tommy |
05-13-2017, 09:46 AM | #9 |
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Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,771
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Re: flathead issues
Opening a can of worms, but I would think that composite head gaskets would be more apt to seal small imperfections in deck or head.
Here is a video of how a head can be surfaced at home. Maybe I've opened two cans of worms. You decide! https://www.youtube.com/watch?v=SK2R2LdkLKs |
05-13-2017, 10:41 AM | #10 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,875
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Re: flathead issues
No, you didn't open a can of worms. In many of the poorer countries in the world where you have to "make do" this is the way it's done.
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05-13-2017, 10:46 AM | #11 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,371
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Re: flathead issues
Cracks in the exhaust valve bowls can be slow seepers. The center deck area it right above the siamese exhaust port and can crack in the center bolt bore area down into the port causing a slow seeper.
If the head gasket is holding its mud then a person might try some Bars leaks but the stuff can also plug up things you don't want plugged at times. If your radiator is old and partially crudded up, the sealers can finish off the plug. |
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