GEP 6.5 NA replacement for CUCV?

[Brogman]

I thought I purchased an older Engine since it was normally aspirated. It came from a Humvee. Low mileage. I read that the older GEP 6.5 oil pans would work in a CUCV and the newer ones will not.

Well, the engine I have is a 12555506, 07 02 K, with double triangles making a diamond on the top of the block. Best I can tell it is a Navistar cast engine. That is fantastic if true.
I have searched the web and the info on the 07 02 K manufacture date is confusing at best. I read two different explanations. I think the date is 07/02/2003 but can't verify that.

It has a mechanical IP not the electronic one.

Also will the oil pan fit? I don't know when the newer engines begin with the oil pan that won't.

I think maybe this was a new replacement engine with low mileage. That would explain the Navistar casting. All the accessories look low mileage too.

Any help would be greatly appreciated.

 

[Stonepicker1]

I installed the same engine in my M1028A2 Dually. see thread below.

http://www.steelsoldiers.com/showthread.php?66745-Dually-M1028A2-South-Florida-Rebuild

You don't need to change the oil pan, it will fit in your truck.

The oil pan on the GM 6.2 engine will not fit on the GEP 6.5 engine. When I did the install, I thought the same thing so I tried to swap the oil pans. That when I found out they were different sizes.

 

[Brogman]

Thanks Phil. I saw your project when I was researching mine. It does look like it will clear the cross member. The slope of the 6.5 oil pan from the front to the bottom is lower than the 6.2 so might have a front axil issue. At least it looks close if you bottom out the front axil. Did you put your 12 volt IP solenoids into the top of the 6.5 or just swap the top? I would like to put the solenoids into the 6.5 top if possible. I will swap the throttle cable bracket from my 6.2 so the cable will be the right length and so I can install the high Idle solenoid.

 

[Stonepicker1]

I swapped out the 24 volt solenoid for the 12 volt solenoid from the old CUCV pump. I also swapped the top cap.

If I had to do it again, I would just install a new CUCV pump.

 

[Chaski]

Thanks Phil. I saw your project when I was researching mine. It does look like it will clear the cross member. The slope of the 6.5 oil pan from the front to the bottom is lower than the 6.2 so might have a front axil issue. At least it looks close if you bottom out the front axil. Did you put your 12 volt IP solenoids into the top of the 6.5 or just swap the top? I would like to put the solenoids into the 6.5 top if possible. I will swap the throttle cable bracket from my 6.2 so the cable will be the right length and so I can install the high Idle solenoid.

I think the 24V top is different. 99% sure that there is two holes in it for the timing advance solenoid where the 12V covers only have one hole. You should just be able to swap the tops with no issues, if you were to try to use the 24V top with the 12V solenoids you would need to figure out a way to patch up that 4th hole.