The Diesel Garage banner

1 - 15 of 15 Posts

·
Registered
Joined
·
116 Posts
Discussion Starter #1
Is there anyting that could be wrong besides a head gasket? I just noticed yesterday when doing the fuel filter that the coolant resevoir looked dark. I pulled the cap and found a milky/creme/light greyish colored liquid that looks an awful lot like oil. My dad said the same thing. I don't know enough about these motors to know if there is anything else that could be wrong? My oil pressure is still good and so are my water temp, so far no white smoke or loss of power either. When I changed the oil yesterday, there was no water in the oil. Any ideas?

If it is a gasket, any idea on what it would cost to have them replaced. If I do have to do it, I'm going to go with the ARP's and copper gaskets so I hopefully won't have to worry again.

I seem to have horrible luck with used vehicles. Third truck that has died a month or two after I bought it of something that couldn't be seen when looking it over.....:shrug:
 

·
Senior Member
Joined
·
2,509 Posts
more likely to be the oil cooler, much easier to repair than a head gasket. a head gasket would probably put coolent in the oil. I don't think there is and oil pressure ports that go through the head gaskets on these engines. The oil pressure is higher inside the oil cooler than the water pressure so if it is leaking the oil would get pushed into the water. It may even just be a blown o-ring inside the cooler.
 

·
Registered
Joined
·
116 Posts
Discussion Starter #3
Where is the oil cooler located?
 

·
TDG MAFIA MEMBER #71
Joined
·
1,288 Posts
It is in front of your oil filter housing looking toward the front of the motor.
 

Attachments

·
Senior Member
Joined
·
2,509 Posts
:whs its a tube about 3in. in diamiter and about 1foot and a half long you cant miss it.
 

·
Senior Member
Joined
·
455 Posts
a bad oil cooler will fill the cooling system with oil not put coolant in the oil.Oil pressure is higher than coolant pressure

causes for coolant in the oil could be

Inj cups
head gasket
cracked head
cavitated black
 

·
Registered
Joined
·
116 Posts
Discussion Starter #8
Well it sounds like I have an oil cooler leak from what everyone is saying, now I just have to figure out what I'm going to do to get it fixed. The only competent diesel guy I know is on vacation. Has anyone done this themselves?
 

·
Senior Member
Joined
·
455 Posts
to get the oil cooler off you will need to obviously drain the coolant from the rad and block just behind the cooler there should be a drain plug in the block.
remove the filter and remove the motor mount on the drivers side then 5 bolts hold the cooler assembly on the engine 2 at the front and 3 in the rear .

The cooler will then slide back and down to get it out .

after the assembly is out you have to carefully drive the filter head and front end caps off .. when you buy a cooler it is just the cooler bundle not the end caps

the end caps are then pressed back on the new cooler bundle the filter head end has a locater notch and the cooler bundle has a tab that lines up in it . install the new orings lube them with lubriplate or another good grease type engine assembly lube.

position one cap on and your own body weight should be able to push it on then repeat with the other end cap and reassemble.

Care must be used in removing and installing end caps if they twist to much they can break
 

·
Senior Member
Joined
·
1,921 Posts
Docluv2577 said:
a bad oil cooler will fill the cooling system with oil not put coolant in the oil.Oil pressure is higher than coolant pressure

causes for coolant in the oil could be

Inj cups
head gasket
cracked head
cavitated black
Injector cups will leak fuel into the coolant not oil. Cavitated block would most likely leak coolant into the crank case therefore coolant into the oil. I can't think of anywhere in the head that coolant and oil run side by side where a crack would dump oil in the coolant but I guess there are a couple places where they don't usually crak that could possibly leak hpo into the coolant. But you'd probably pump all the oil into the coolant pretty quick that way. So most likely it would be the oil cooler.

If you look in Docs pic the oil cooler is the horizontal piece just under the exhaust manifold. The rearward end is the part the oil filter attaches to. Could be as simple as a blown seal between the two so you might get away with a cheap o-ring fix rather than having to replace the whole cooler.
 

·
Registered
Joined
·
116 Posts
Discussion Starter #11
Would there be any external signs of the oil cooler being the culprit besides oil in the coolant, or is it all internal?
 

·
Senior Member
Joined
·
1,921 Posts
it could be leaking oil or coolant externally but most likely it's just leaking internally.
 

·
Senior Member
Joined
·
455 Posts
GTS I have seen inj cups leak at the bottom edge leaking coolant into the cylinder when shut off allowing coolant to seep past rings into pan .. this of course is usually joined by an overheat issue from compression getting into the coolant when running.


as for the cooler leakiing externally they can leak oil externally from the orings at the heads or leak oil or coolant from mounting gaskets if it is blown internally or the oring is bad coolant wont leak externally it will just let oil into the cooling system
 

·
Senior Member
Joined
·
1,921 Posts
Docluv2577 said:
GTS I have seen inj cups leak at the bottom edge leaking coolant into the cylinder when shut off allowing coolant to seep past rings into pan .. this of course is usually joined by an overheat issue from compression getting into the coolant when running.


as for the cooler leakiing externally they can leak oil externally from the orings at the heads or leak oil or coolant from mounting gaskets if it is blown internally or the oring is bad coolant wont leak externally it will just let oil into the cooling system

Correct on all accounts. I said you can't get oil in the coolant from the injector cups. You can get coolant in the oil as you described though.
 

·
Registered
Joined
·
596 Posts
If you are careful you can pull the cooler assembly out of the truck to the rear (towards the cab) without pull the motor mounts. It's a bit of a tight fit, but it can be done.
 
1 - 15 of 15 Posts
Top