JD 318 Wont Start, Backfires through carb and exhaust.


[ Save This Page ] [ Follow Ups ] [ Post Followup ] [ John Deere Tractor Discussion Forum ] [ FAQ ]

SSB Farm Tractor Parts, Manuals & Antique TractorsAftermarket Farm & Old Antique Tractor PartsTractor Service, Repair & Owners Operators Manual ShopTractor ImplementsTractor SeatsTractor Front End LoadersPedal Toy Tractors Farm Tractors For Sale ClassifiedsAntique Tractors For Sale ClassifiedsTractors Forum - Help & AdviceTractor, Gardening, Mowers & Outdoor Equipment BooksTractor ProductsContact Us
SEARCH MANUALS
FIND PARTS
How much is your farm tractor worth? Find resale prices for tractors built from 1939 through today, with complete specifications and serial numbers. Save 15% on our Official Tractor Blue Book sale!

Search This Message Board:

JD 318 Wont Start, Backfires through carb and exhaust.

Justin Hi all,

Im stumped. I went to start our JD and the darn thing wont start. It cranks over, backfires through the carb and now and then through the exhaust, has a week spark it seems, the spark plugs ar enot the ight ones but worked just fine even when carbon built up on them almost bridging both contacts. I had already cleaned the plugs a few weeks ago which made the tractor run much better.

It has a coil and not points. Plenty of fuel, or atleast I can smell it. Compression is just above 90PSI on both cylinders, one cylinder burns oil but was never a problem before.

Fuel filter is about... well. Im going to take a guess. probubly has been in there since 1984 :) So im going to do something about that but that wouldn't cause the engine to backfire through the carb.

Anyone got any ideas?

ross Sounds like a timing issue. Might want to check your flywheel key.
Justin I did some more testing on the spark issue and found it to be the plugs. For some reason, they worked for years and worked perfect a after I cleaned them the other week and all of a sudden they didn't produce spark.

Swaped them out with the right type and shortend the gap and tracker works fine.

Justin Thats what I thought at first, but I couldn't understand how it could be timing since I don't know to much about these tractors.

Just for future reference, where is the flywheel key? Do you mean the keyway to lock the flywheel onto the crank shaft?

ross There is a slot on the crankshaft and on the flywheel that is lined up with a key.


[ Save This Page ] [ Follow Ups ] [ Post Followup ] [ John Deere Tractor Discussion Forum ] [ FAQ ]
Post a Followup

Name:
E-Mail:

Subject:

Comments:


[ Save This Page ] [ Follow Ups ] [ Post Followup ] [ John Deere Tractor Discussion Forum ] [ FAQ ]

Name:
Email:  

Sign Up For Our Monthly Special Sales!