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In Reply to: JD318-speed surging and starting problems plus synthetic oil use. posted by Bob Thiessen on Tuesday, November 03, 2009:
Bob - A 1987 318 should have an Onan P218G engine, not a B43G engine, unless someone swapped it out. The P218G has electronic igntion, while the B43G has breaker points.
The starting problem could be a safety switch not making contact. Could be a bad ignition switch, or it could be the TDC module. Hope and pray it's not the TDC module. There may be a blown fuse, a bad starter, a bad ground; the list goes on. The main ground is located under the battery tray on the pedestal. Make sure there's no corrosion or paint build up at the connection. That may help, but there may be another issue.
Is the surging from the engine or the transmission? If it's the engine that's surging, most likely cause is a dirty carb or a weak or misadjusted governor spring. If the transmission is the source of the surging, it is most likely a bad or failing charge pump, or worn linkage.
Synthetic oil is OK, but I have found that in these Onans, straight 30 weight or 10W40 dino oil, changed at 25 hour inervals (Spring and Fall for me), provides excellent protection. Synthetic oil should not be used at extended change intervals, but is fine at normal change intervals. - Dave
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