We have a 963A with a 3304 DI engine that is best guess running lean causing the exhaust temps to rise to the point its causing the muffler to turn white with heat. The injector pump was recently rebuilt and the engine is not skipping or other wise running "rough" but it does feel weak based on my superintendents feed back who ran it prior to the rebuild of the pump. Does the machine running lean and feeling weak line up with anyone's prior experience with these older 963's and the 3304 engine in general? We're trying to sort out if we need to pull the injector pump back off and send back for a second look or if there is an adjustment to be made on the pump as can be made with some of the older non-electrically controlled engines. Machine Model: 963A S/N: 21Z4051 Thanks, 631G
Timing & "over" fueling will get the temps up.. If ur not rolling black smoke.. I'd say go back thru the timing.. Who did the pump ?? testmasters ??
have you checked tubor or air cleaner, fuel lines for flow. cap for stoped up vent, they are almost bullet purfe. and check for stoped up muffler, air goes in has to come out.
The pump was built by Associated Fuel I am told. Timing isn't off from what I can tell because the engine isn't missing or acting up like what I've seen other miss timed engines do. But we'll check it anyway. We are taking to another independent mechanic that is going to work on our 963B to have a run at it. We have been told that its likely running lean on fuel because the exhaust is not black, its actually very clean with little to no color at all.
Muffler is brand new and air filters have all been replaced or cleaned recently along with fuel filters. Fuel lines have not been checked for flow rate but have not indicated that they aren't running fuel to the pump through causing a died out off an on. We did find that the vent cap on the top of the valve cover is cracked so will be fixing that. Anyone know a part number for that port?
Diesel isn't like gasoline. There really isn't "lean" or "rich" per se. With a diesel engine, putting less fuel through the injectors simply means less power. Less fuel to burn, less heat is produced. Controlling the fuel flow out of the injectors is the entire principal of how RPM is controlled on a diesel. Basically saying if you cut the fuel flow volume through the injectors, you'll just slow the RPM down/make less power. No way it'll make too much exhaust heat. A gasoline engine needs to maintain a specific air/fuel ratio for optimal burn. Its the volume of the air/fuel mix allowed into the cylinder that controls the RPM. You say the muffler is new, is it the proper muffler or an aftermarket one that somebody stuck on it and kicked it out the door? What about the pipes? I'd say double check the timing like mentioned above.
Wasn't there a thread on here a while back where a mis-timed tractor made it out to the field with little smoke or other symptoms only to melt the tops off the pistons right away?
It's a 2W-9162 Breather (#3). Also requires a 4L-9564 O-Ring (#4) if you are replacing it.
Thank you Nige.
How about a pic of the inj. pump.?? I may be able to tell u how to fix the "lean" part of the problem..