coolant in 12v71 oil

[ageless]

blew a coolant hose yesterday, caught the temp rising just as it hit 180. Shut the motor off and was towed in by an excellent Capt Lee and Tim from Tow Boat US Beaufort, NC. Replaced the hose but was reflecting on the possibilities from overheat (although minimal) and my gut told me to check the oil. Really? Dipstick read almost 4" above the full mark. Checked the gear level to ensure I didn't blow a seal under tow but gear level was perfect. Drained the oil and got 4+ gal of other than oil fluids in the beginning of the drain.
Suggestions where I go from here to determine where the intrusion occured

?

 

[Boatsb]

That's definitely not Detroit oil. At least it's not mixed in and all over the engine.

Drain the rest of the coolant ASAP.

Get some oil in there to protect the parts that are good.

I'd look for a good Detroit guy who has experience with your engines or it may be time for a complete overhaul. It can be a lot of things so

 

[johnjen50]

Wow. That looks like all coolant and no oil. Yep. Better drain and refill with oil ASAP. Should run it for a minute to circulate the new oil and coat the parts as well.

 

[Boatsb]

Don't run it it will mix the oil with the fluid and make things worse.

 

[Briankinley2004]

looks just like fleet charge coolant. wonder if a heat exchanger failed letting the coolant into the oil causing it to over heat. And hose blew as a result?? Seems like it would be more than a blown hose to cause coolant to get into oil

 

[MVCaprice]

looks just like fleet charge coolant. wonder if a heat exchanger failed letting the coolant into the oil causing it to over heat. And hose blew as a result?? Seems like it would be more than a blown hose to cause coolant to get into oil

If an oil cooler core deteriorated and was leaking that could cause it, but I don't think main HE's are anywhere connected to the oil at least they are not on our 12-71's.

 

[ageless]

Interesting thought that something major occurred before the hose blew, guess I never thought of that, automatically associated the overheat with the hose splitting and spewing coolant everywhere

 

[ageless]

Wow. That looks like all coolant and no oil. Yep. Better drain and refill with oil ASAP. Should run it for a minute to circulate the new oil and coat the parts as well.

The first 4+ gallons that pumped out were in fact coolant, then 9 gallons of oil followed.

 

[ageless]

looks just like fleet charge coolant. wonder if a heat exchanger failed letting the coolant into the oil causing it to over heat. And hose blew as a result?? Seems like it would be more than a blown hose to cause coolant to get into oil

if the overheat caused a head gasket to go or a head to crack the fluid could easily get into the oil

 

[Boatsb]

The coolant hit the oil pan after the engi e was shut down or it would be mixed and emulsified

 

[ageless]

Don't run it it will mix the oil with the fluid and make things worse.

no worries, I'm not starting it. I've emptied the oil pan and filled with fresh oil, drained all the coolant, as well.

Call into mechanic but would like some idea where I might start to find the cause of intrusion

 

[dsharp]

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.

 

[dottieshusband]

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.

 

[ageless]

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?

 

[dottieshusband]

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.

 

[Cricket]

Bring in somebody that knows what they're doing. Better get your wallet ready for this one.

 

[racclarkson@gmail.com]

I sure am sorry to hear the news. We have the same boat. Keep us in the loop.

 

[kelpy]

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.

 

[SEVEN]

Would 180 degrees really be considered over heating? I run all day long at 170.

 

[ageless]

Bring in somebody that knows what they're doing. Better get your wallet ready for this one.

Discussing with the Mrs which direction to go, she’s been surprisingly accepting of repower, she insist on a new fridge and eliminating the raw water heads in return