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Thread: coolant in 12v71 oil
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05-16-2018 10:43 PM #11
Re: coolant in 12v71 oil
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05-16-2018 11:23 PM #12Senior Member
- Join Date
- Jan 2006
- Posts
- 822
Re: coolant in 12v71 oil
There isn’t a head gasket. It probably got hotter than 180 and cooked the rubber seals between the head and the block. Pressure up the cooling up system and see if it leaks down rather rapidly. It likely won’t hold pressure. If you have to pull the heads check for cracks around the valves.
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Re: coolant in 12v71 oil
Of course I haven't seen it, But Bobb is right on. It's not emulsified, so the coolant tank pressure forced coolant into the pan after shutdown...that's good. The 12v71 is a dry liner, so it's nor a liner seal, which leaves the oil coolers or one of the many rubber head seals. The rubber head seals aren't known for just letter go....but an over heat would do it... The oil coolers do wear out (corrode). Fortunately on a 12v71, they are pretty accessible and easy to change out.
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05-17-2018 05:12 PM #14
Re: coolant in 12v71 oil
Update--pulled the airbox covers and a heavy cup of coolant came out of 6R.
Should I proceed to take the head off and have it tested?
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Re: coolant in 12v71 oil
Pop the valve covers off, as well air air box covers, partially refill the coolant tank, pressurize the coolant tank...look for leaks high and low.
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Re: coolant in 12v71 oil
Bring in somebody that knows what they're doing. Better get your wallet ready for this one.
CRICKET
1966 HAT50C101
Purchased 1985 12v71Ns
Repowered 1989 with 8v92TI
Repowered 2001 with 3406E
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Re: coolant in 12v71 oil
I sure am sorry to hear the news. We have the same boat. Keep us in the loop.
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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05-17-2018 08:44 PM #18Senior Member
- Join Date
- Apr 2008
- Posts
- 494
Re: coolant in 12v71 oil
Which hose failed? It sounds like the head is cracked but that doesn't happen to 6R or 6L very often.
The head may have failed first causing the hose to burst. You can check the remaining coolant in the HE with a test strip to see if exhaust residue is present.Last edited by kelpy; 05-17-2018 at 08:48 PM.
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Re: coolant in 12v71 oil
Would 180 degrees really be considered over heating? I run all day long at 170.
SEVEN
1979 53' MY Hull #563
Antioch, California
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05-17-2018 10:09 PM #20