Originally Posted by Simister
So what are we saying here?
That the pressure will hold in the oil galleries for a few days but after a few weeks needs to be re pressurized by extensive cranking?
If this is the case, (and it certainly makes sense) is this normal for small diesel
engines or can it be fixed? The engine only has 250 hours but it is 10 years old.
Makes no sense at all, first the oil galleries won't hold pressure for more then a couple of seconds after the oil pump shuts down ie: engine stops.
Oil in the cylinders will create grater compression
at the rings when wet, less then when dry after setting for a week or 2. A sign of low compression or improper break-in, or lightly loaded causing cylinder glazing, which results in low compression.
Second, most generators use a bypass alarm
circuit, during the the start crank.
So that leaves either fuel pressure, bc of air in the system, low turnover during cranking or low compression.
Low compression can be caused by improper brake-in when the engine was new, and will only gradually get to the point that it shows up after warm-up.
Trouble shoot as follows:
Make sure the battery
has enough cold cranking amps to turn the engine over at cold start-up.
Trouble shoot as follows: pressure test the fuel systems and make sure it holds pressure.
Do a compression check on the engine cylinders when cold, and then after warm. A differential will be suspect.