AIR, FUEL, SPARK? iS IT LOSING SPARK OR FUEL OR COMPRESSION?
A FEW POSSIBILITIES
Originally Posted by Dffraser
I have an Onan Emerald 1 genset that runs for about 20 minutes and then stops. I have replaced the circuit board, fuel pump and fuel filter. When I was at Quartzsite last year an Onan tech said it could be that the generator was overheating and shutting down. Does anyone know what the operating temperature is for this genset?
, with a few questions: QUESTIONS:
1) Other symptoms? Surge before dying, surge on start? (Usually signifies fuel delivery issue to carb, either filter, pump, or fuel line?
) 2) LOPE LIKE RICH, or seem/ feel HOT?; 3) RESTART after dying or have to wait 10-20-min to cool? (TYPICAL OF FAILING PUMP, BUT YOU already replaced)
; 4) Check plugs after dying? Black, sooty, or Normal brownish gray, dry or wet? 5) OVERHEATING: Emerald is flat-head, air-cooled, no temp switch for shut down to my knowledge, but MUD-DAUBER NEST UNDER SHEET METAL AFFECTING AIR FLOW ACROSS HEAD CAN/ WILL AFFECT valve seats and rings/ compression
DO not RUN MORE THAN 30-SEC WITHOUT SHEETMETAL
If Emerald I (Is it a BGE series A-?) old enough to have Points Condenser, maybe [U]condenser
[/U] failing, COIL
Intermittent. Failing BRUSHES
causing loss of AC power will shut down GEN; 6) OIL/ OIL PRESSURE SWITCH/ OIL FILTER CLOGGED/ LOW OIL;
When it starts, does it start easy, or crank a lot? If crank a lot from cold start, possibly slow to build pressure and clear OP switch to allow Ignition? CHANGE OIL, FILTER AND SWITCH, and/ or inspect/ clean OP Switch OIL PORT? (mounted next to Oil Filter) Luck, let us know answers? 7) Wrong oil in wrong weather can cause slow crank/ hard start, but usually not dying, unless internal sludge causing drain back/ pressure problems.