LLY: Ahhhh....Motor Frustration!

[Krazykid]

Well, if the hose is still rock hard after sitting for a while (at least over night), then I'd say there probably is a headgasket problem. If there's fuel in the oil, the only place it can come from on the LLY's (AFAIK) is the CP3.

So, if I am understanding this correctly, The head gaskets are the only cause of the hard rad hose on the LLY's? In addition to the head gaskets the CP3 which I have been suspect is weak for over a year now, Now is leaking fuel into the CC some how?

The oil is dripping from the oil drain plug. I double checked this last night and tightend and yet this morning without driving all night there is a drip? WTF?

 

[Cougar281]

So, if I am understanding this correctly, The head gaskets are the only cause of the hard rad hose on the LLY's? In addition to the head gaskets the CP3 which I have been suspect is weak for over a year now, Now is leaking fuel into the CC some how?

The oil is dripping from the oil drain plug. I double checked this last night and tightend and yet this morning without driving all night there is a drip? WTF?

To my knowledge, HG's are the only thing that would cause the upper hose to get hard and stay hard after it's sat.

If you definately have fuel in the oil, the CP3 shaft seal is the only place it can leak into the CC as far as I know on the LLY, LBZ & LMMs.

 

[Krazykid]

To my knowledge, HG's are the only thing that would cause the upper hose to get hard and stay hard after it's sat.

If you definately have fuel in the oil, the CP3 shaft seal is the only place it can leak into the CC as far as I know on the LLY, LBZ & LMMs.

Guys, thank you for the information.....I'm guessing that I will proceed witht he head gasket project and while I have the top of the motor apart I might as well pull the CP3......

 

[WolfLMM]

What happened?

The injectors can leak into the crankcase on an LLY (if its stuck open) I highly doubt thats the case here though.

EGR cooler could be leaking.

 

[duramax215]

may sound stupid but is your oil filter totaly tight for the oil drip problem

on edit: i need to subscribe to this thread anyways because in the last 3000 miles i put on my truck i used a gallon of coolant on my LLY and can't find where its going none leaking and none going into oil from what i can see

 

[Brayden]

Headgasket is the problem... If it's cool and has a swelled upper rad hose then it's being pressurized by combustion gas. The MLS gaskets will hold at lower boost pressures, idle, and during shutdown normally, but when you push the truck it will push combustion gas past the gaskets.

 

[rebel7777]

But why is he not using coolant? A blown head gasket should show signs either with coolant on the ground, in the oil or soot in the coolant. I don't see how a hard rad hose by it's self can be considered a blown head gasket. Am I missing something?

As to losing oil level, what oil are you running? A light synthetic could cause oil blow by and the engine will burn the oil. You would never notice this. These engines don't have very tight tolerences from piston to sleeve allowing for the oil to be burned.

Just had one of my engines apart with 80K miles and it still shows the honing marks, engine was stock no extra hp, ran great just need more hp out of it.

 

[FamilyWagon]

So... my LLY seemed to burn a bit of coolant when towing for 300 miles... nothing on dipstick and no leaks. i put 1/8th of a galon into the fill tank and when the air burped out it seemed fine. but as for where the colant went, im not sure if it burnedit up from towing or if i may have a HG problem too. temp never went above 210 and 180 trans temp, even thou it was 98 outside.