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Thread: coolant in 12v71 oil
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05-17-2018 10:12 PM #21
Re: coolant in 12v71 oil
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05-18-2018 12:29 AM #22Senior Member
- Join Date
- Jan 2006
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- 821
Re: coolant in 12v71 oil
Hopefully you just melted the rubber seals . I didn’t get that lucky and cracked a head but the gauge was pegged when I caught it. I was letting a friend hold the wheel so I don’t know if I could have caught it in time either. It ended up being a steel tube that connected the he tank to the circulating pump. I hope the damage isn’t too severe. 180 shouldn’t have melted the seals.
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05-18-2018 02:01 AM #23
Re: coolant in 12v71 oil
It’s amazing how quickly things go wrong once coolant leaks out. A couple years ago a guy I know with a 65 convertible lost a coolant hose and smoked a 12-92. It was toast before he system monitor caught it or perhaps his monitor wasn’t working. In any event a big deal. Hope all works out and isn’t too bad. Keep us informed and do post more pics!
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05-18-2018 08:18 AM #24Senior Member
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- Apr 2008
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- 494
Re: coolant in 12v71 oil
Last edited by kelpy; 05-18-2018 at 08:22 AM.
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05-18-2018 09:00 AM #26Registered Member
- Join Date
- Oct 2016
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- 17
Re: coolant in 12v71 oil
My $.02 may or may not help, but this is what I experienced after bringing my (then) new boat home from NC to CT. 12-92's ran great with no issues. The morning after the last run into port, I checked the oil and found exactly the same in my port engine oil pan. Lots of probing, pressure testing ....... you name it. Without getting too long winded, I found that the coolant pump seal blew. The weep hole was clogged and the seal between the gear drive shaft and the timing case side of that pump blew as well. Result .... after the engine was shut down and there was residual pressure in the coolant system, coolant entered the crankcase via the timing cover under which is the pump gear drive. My guess it started with residual pressure and turned into a siphoning effect. I pumped out 4 gal of clean pink coolant before (luckily) getting to un-tainted engine oil. Changed out the coolant pump, oil, and coolant and all good. Are 12-71's and 12-92's similarly configured? That I do not know. But the similarities in your situation and what I experienced is evident. Hope you fare as well as I did.
JJ.
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05-18-2018 01:16 PM #27
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05-18-2018 02:37 PM #28Senior Member
- Join Date
- Apr 2008
- Posts
- 494
Re: coolant in 12v71 oil
The drain pasasage is pretty large to get crudded up but evidently it can happen. Doesn't sound like it in this case though. The OP found evidense of coolant in cylinder 6R. It cant get there from the coolant circulating pump.
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05-18-2018 05:46 PM #29
Re: coolant in 12v71 oil
The pins that the rockers pivot on in the cylinder head have coolant under them. If they become loose, that is a potential source of coolant in the oil.
When I had coolant in my oil, it was not emulsified but concentrated in the bottom of the oil pan even though that coolant/oil had been circulated through the engine.
I also experienced coolant in the oil from a couple of cracked liners on my 12V71TI.
It's probably overhaul time. It was each time for me.
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05-19-2018 05:50 PM #30Senior Member
- Join Date
- Feb 2017
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- 64
Re: coolant in 12v71 oil
We've had this a few times so a couple thoughts and they're only worth what you paid for em!
1. 180 degrees shouldn't be too hot
2. It's rare an oil cooler fails. Usually it will transfer oil in the coolant since oil pressure is higher than coolant pressure.
3. JJgar's54 has a good thought on the water pump. It will make coolant temp rise and transfer water quickly. Had this happen last year.
4. Injector tubes will cause water in oil, usually not quickly thought. Hopefully the pic will post of one we found last week.
Pressurize the system and let us know what you find. Were always up for an education.
If it wasn't so far I'd help you.
871 water in oil.jpg1984 Hurley 36 Express sold
1974 46C series I sold
1984 46HP series II