JD 3020 Gas Spark Plug Question

rbeissel · Nov 21, 2023

I have a 1968 JD 3020 gas tractor that I recently replaced spark plugs. I installed Champion D14 (JD #AA4053R) which are OEM. The spark plugs I removed were Champion D21. Im wondering what the difference might be between the D14 & D21 plugs besides the heat range being higher on the D21? Perhaps better economy? Does it start any better in winter? Has anyone ran the D21 in place of the D14? Anyone's thoughts?

Janicholson · Nov 21, 2023

The D21 plugs are the highest Champion plugs in that application. hot plugs are often used in start stop multi start situations in which the engine is not operated at normal temperatures very often. They can stay cleaner because they become hotter sooner. They do not provide any better starting than any other appropriate plug because they just make spark as they all do. If a colder plug is used and does not foul, the starting will be the same. If the reactor is beginning to feel it age and uses oil a hotter plug will reduce misfire and fouling, but if that engine is put under full temp full load, it can initiate knock by being hot enough to ignite the mixture before spark! So run hotter plugs in a well used engine that is not seeing tillage level loads. a clean burning engine can use colder plugs to avoid the perignition issues noted above. Jim

buickanddeere · Nov 21, 2023

How about trying the Autolite 3116 ?

620 John · Nov 21, 2023

I've been running Autolite 3116 in the 3020 for about 800 hours now with electronic ignition. Still running good.

JD 3020 Gas Spark Plug Question

rbeissel

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Janicholson

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buickanddeere

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620 John

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