Saturday, December 10, 2005
CAT 3116 DIESEL ENGINE PROBLEMS AND FIXES
We have 13 CAT 3116 diesel engines in our fleet and there have been some problems so I thought I would share them with you. First of all I have to say they are unbeatable as far as construction goes. Heavy castings make this diesel engine hard to kill!
However, one weak spot are the exhaust valves, they break and make one big mess. The head must be repaired or replaced, we have been using REMANUFACTURED heads which cost us around $1200.
To prevent this exhaust valve problem we make sure the valves are adjusted every 60,000 KM. [ 36,000 miles]
The turbocharger must be checked as well as the cylinder and piston related to the offending exhaust valve. With flying valve debris there is no room for taking a chance!
CAT 3116 diesel engines are fussy as far as setting valves and injectors. You MUST have the proper tools. The fuel is controlled by a GOVERNOR that moves a rack attached to each unit injector.
The 3116 tune-up: requires checking & adjustment of the fuel setting, synchronization, injector timing and valve adjustment. The tool kit has a digital dial guage that keeps adjustment tolerances within specifications. All tune-up specs are on top of the valve cover.
Another problem we've experienced is pressure in the fuel tank from compression blowing by the injector seats into the fuel system causing the engine to run very rough with no power. The injectors have to be removed and tested while the injector seats must be machined. If machining does not clean up the seats they must be replaced which can be done in-frame. When installing a 3116 injector you must use a special injector hold-down tool that seats the injector properly. We also use the o-ring seal on the injector tip even though it's not specified, it adds an even better seal.
These 2 failures are the most common we've experienced with the CAT 3116 diesel engine. There have been a few injector[they seize up] and governor failures but far and few between.