|
Faunsdale, AL | Just which O-rings are you changing? Water leaking around the PC chamber? Combustion gas getting into the cooling system or combustion gas leaking up around the injector? The old style chambers (without glow plugs) were a 2 piece assembly and you needed the whole set of tools shown at the top of the ebay link, but you could change just the o-rings at the top that keep the coolant in without disturbing the chamber and it's seal into the cylinder.
Newer CAT engines that still used PC chambers went to a single piece chamber and you must remove it and replace the seal ring underneath it that seals it into the combustion chamber of the head at the same time you change the o-ring around the top of it that keeps the coolant in. Use copper anti sieze on the threads and clean the sealing surfaces with wire brush etc so you get a good seal top and bottom. Torque to 140-160 foot pounds. Injector hold down nut torque to 100 foot pounds
Removing PC chambers is not to be done lightly. You can take the threads out of the head if you're not lucky/living right! If it has to come out, then sometimes an impact wrench will get it out with less trouble than a breaker bar once it's broken loose. If it doesn't spin right out, then go back and forth, a few minutes spent loosening it up can save you a bundle purchasing the helicoil repair from CAT that is needed to fix them when you take the threads out with the chamber.
| |
|
cat 3306 prechamber removal
