6.2 problems

[lefty88]

Ok, so I have an 82 K% with a 6.2 crate motor. The motor is a hybrid version, meaning it has all the components of a 6.5 diesel engine with a 6.2 block.. I got a really good deal on the motor from a friend who worked at the local auto parts. The motor had been custom ordered by a customer around 6 years ago, and never paid for nor picked up. After 6 years sitting on their floor, I was offered the motor cheap.

(it was a long block with heads already installed) all it needed were my oil pan and injector pump, and intake.)

Problem is after I put it together, there was water in the oil.. My question being would that be a cracked head, or could there be an issue with a vent or something in the head? I believe they are 6.5 heads on the 6.2 block. Could a cracked block do this?

It was a 'new' crate motor, built by a machine shop here in town. All I can think of is they forgot to plug asomething or cracked the heads not torquing them properly.

Any idea's?

 

[tRustyK5]

Gasket issues maybe? Really you're not gonna know until you pull the heads anyways...

How long did you have it running before finding water in the oil?

 

[lefty88]

Gasket issues maybe? Really you're not gonna know until you pull the heads anyways...

How long did you have it running before finding water in the oil?

Basically I ran it for around 15 min, turned it off and checked the fluids. When I did, I noticed the milky oil.

Could there be a vent or valley/hole that they forgot to plug? Its a 6.2 block with 6.5 heads..

 

[tRustyK5]

Any oil in the coolant? How much coolant do you estimate to be in the oil? Enough to raise the level, or are we talking a few milky spots?

I'm not aware of anything different about the 6.5 heads that would require something blocked off. As far as I know it's all same same regarding swapping between the two engines.

 

[paratrooper307]

Any oil in the coolant? How much coolant do you estimate to be in the oil? Enough to raise the level, or are we talking a few milky spots?

I'm not aware of anything different about the 6.5 heads that would require something blocked off. As far as I know it's all same same regarding swapping between the two engines.

If the engine was sitting around that long it very easily could have picked up some moisture on the inside of the block, depending on how it was stored. I'd change the oil, top off the coolant, and run it. If your coolant is going down and your oil level is going up, then you have a leak somewhere. Just no sense in tearing things apart until you've ruled out residual moisture.

 

[lefty88]

The level of coolant is going down.. I'm sure I have a leak, just trying to get idea's before I tear into it.. The injection pump and fuel rails removal is quite the job.

 

[diesel4me]

Yeah,and one I pray I never have to do on either of my 6.2's...its worse when the injector lines are so crisp they'll crack and leak as soon as you touch them from our salty climate up here...
I have some good used ones some kind CK5 members sent me in the event one or more of them fail,but I still hope the day never comes I need to replace them all..
Just think,to change the stupid valve cover gaskets these lines all have to come off,then the fun of bleeding the fuel system also is needed later!...my valve covers were leaking but it was a rot hole in them,not the gaskets (yet!)..J-B Waterweld to the rescue again!..

I dont think the intake has any water passages on the 6.2 so you can probably rule that out..

I've read in older Chilton manuals about the heads having a coolant leak problem due to some faulty castings in the heads and there was a brass freeze plug type thing to seal the area that was leaky available aftermarket,the area wasn't a typical round hole though,it was a weird shape...wish I had a way to post a picture they show in the manual..

Another place I bet could ooze coolant into the crankcase is the plate sandwiched between the water pump and block too..

 

[lefty88]

I'm hoping that my assumption is correct.. that a machine shop would not build a engine with an already cracked head.. So I'll tear em both off this weekend if I get around to it, and also check the water pump plate. Haven't heard that one, but its worth checking either way.. I just want my baby back on the road before winter hits.. A buddy of mine has a set of heads for me if needed, so hopefully it'll be an easy fix.. Luckily it was the bottom end on his 6.2 that took a crap.. and not the top end.