MEP-007 B 100kw generator Cat 3306 coolant leak around injectors

[Suprman]

I have an older MEP-007B its a 1981 I believe. I got it drained/dry it has sat for a few years. When filling the coolant I noticed alot coming out around the front most injector it was bubbling out. I couldnt find a parts breakdown tm for this gen I searched and it seems around the injectors are a precombustion chamber. And this has a coolant path around it with o-rings. Does anyone have any experience or insight into this I didnt want to just start tearing it apart.
Thanks
Will

 

[rustystud]

I have an older MEP-007B its a 1981 I believe. I got it drained/dry it has sat for a few years. When filling the coolant I noticed alot coming out around the front most injector it was bubbling out. I couldnt find a parts breakdown tm for this gen I searched and it seems around the injectors are a precombustion chamber. And this has a coolant path around it with o-rings. Does anyone have any experience or insight into this I didnt want to just start tearing it apart.
Thanks
Will

I've worked on the "Cat" engines and this O ring has been a problem before. You can replace this O ring with a "Silicone" one. It will stand up to the heat better.
I just remembered. You have to watch out for coolant etching and rust around the precombustion chamber. If you get too much rust the O ring will not seal correctly.

 

[Suprman]

I ordered the tool to get the chamber out. Never done it before is it a straightforward process?

 

[rustystud]

I ordered the tool to get the chamber out. Never done it before is it a straightforward process?

It should be as long as the precombustion chamber cooperates and is not seized in due to rust. A few good blows with a heavy hammer can help loosen it up. Of course then you might also be replacing the precombustion chamber .

 

[Suprman]

Do I just pull the injector then use the special tool to unscrew the chamber? Do I need anything special to pull the injector?

 

[rustystud]

Usually you can pry the injector out with a pair of heel bars. Just lift straight up, don't cock it. Then you can insert the tool to remove the chamber. It should self thread in. Sorta like a tap. Then it is pulled out by tightening up the bolts.

 

[Suprman]

The injector came right out with my home made cummins injector puller. Old gasket was hard and falling apart. Got it all back together and running it started blowing a geyser of coolant out the radiator cap. Drained all the coolant took off the upper and lower radiator hoses and flushed the heck out of the radiator and block. Got a good amount of gunk out. I filled it with water and ran it slow to get all the air out. Hooked it up to a heater I have it only pulls around 20k but it's the biggest load I have. Ran it for half an hour or so and everything seems fine now.

 

[rustystud]

Glad to hear everything went OK. So you had the gasket instead of the 'O'ring ? Did you have the copper gasket between the injector and the precombustion chamber then ?

 

[Suprman]

I had new o rings for the I injector. I had someone helping me if there was a copper gasket right on the tip end it was reused. The fuel solenoid is a little funny there is a arm above right of the solenoid it has to be moved manually into position to start the gen. I think it just needs a good clean and lube.