New To Forum and JD ownership... 318 surging motor?
Posted April 25, 2011 - 11:48 AM
Now, she starts right up and has a little bit of smoke. But the issue is the engine surges. At all speeds. Now, once I'm at full throttle and deck engaged, I don't notice it. The previous owner said it's probably just the gas thats been sitting all winter and to run some clean gas thru her.
What do you all say? I put some seafoam and a couple gallons of gas and ran her. Still there. I'm pretty handy and don't mind getting my hands dirty.
Also, how to obtain info on oil and hydraulic oil changes? Do I need filters form JD, or auto parts stores will have them?
Thank you all in advance..
Posted April 25, 2011 - 12:18 PM
Posted April 25, 2011 - 05:05 PM
Posted April 25, 2011 - 07:38 PM
Posted April 25, 2011 - 07:42 PM
Posted April 26, 2011 - 09:49 PM
Filters are up to you, since they are changed so infrequently I just use the Deere ones, they aren't too expensive. The oil drains at the bottom right of the engine, where there is a small t-fitting. A neat tip is to put a small chunk of hose on the fitting so you can direct the used oil into a container and it doesn't spill out onto the frame (which is in the way, of course). There is a plug in the bottom of the transaxle where the hydraulic fluid drains, on mine it is a square head and is magnetic to catch any particles the filter might miss. John Deere hyguard low viscosity is the proper fluid to run. 10w-30 oil for all weather use, the manual recommends JD oil or a high quality engine oil.
Posted April 27, 2011 - 05:31 AM
Posted May 11, 2011 - 05:55 AM
Posted May 11, 2011 - 09:55 AM
Posted May 11, 2011 - 01:03 PM
Posted May 11, 2011 - 01:49 PM
Glad to have you with us.
Posted May 11, 2011 - 05:49 PM
Lean could also be a intake manifold problem. I had a Ingersoll 226 and it wouldnt go above half throttle without the choke! The rivets for the intake manifold popped off on the 2nd cyl. Drilled all them out and resealed and tapped for 10-32 cap screws.
- Gary400 said thank you
Posted May 11, 2011 - 06:15 PM
The 1990 318 has the P218 Onan engine so no dashpot (and no points either...it is electronic ignition.) Usually the surging at low load is related to a blocked low speed jet, so you need to clean the carburetor thoroughly which means taking it apart if the seafoam does not clear the blockage.
Another common cause of hunting/surging is an air leak below the throttle plate. In high hour engines this can be worn throttle shaft bushings or wear on the shaft itself, but it is also common to have leaks in the manifold itself. The Onan intake manifold is a two part assembly, and the seal between the halves can begin to leak with age -- there are many threads on other forums on how to address this. Since your engine has under 1000 hours on it, it most likely is the blocked carburetor jet or passage so start there.
- Alc said thank you
Posted May 11, 2011 - 08:26 PM
Posted May 11, 2011 - 10:07 PM
Thank you for the warm welcomes I put seafoam and am about half a tank into it. It seems to be getting better. When I change the engine and trans oil, I'll take a look over the whole engine. I'm hoping it's just a clogged jet.
BTW, as for oil, it Shell Rotella 30 weight good? What is you favorite oil for the summer? Also, it smokes a bit on initial startup after sitting overnight. Anything I can do?