Farmall cub spark plugs.

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J3 Driver
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Farmall cub spark plugs.

Postby J3 Driver » Tue Apr 04, 2017 7:36 pm

So my son's 1957 cub developed this miss a week or so ago. Tonight I finally had time to pull the plugs and take a look.

As you can see in the attached picture they don't look to hot.

I going to get a new set. It currently has Champion D18Ys in it. My question is should I get the D16s or the D21s. Also what does the Y stand for.

Thanks.

Keith
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Jim Becker
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Re: Farmall cub spark plugs.

Postby Jim Becker » Tue Apr 04, 2017 8:14 pm

D-16 is colder, D-21 hotter. The "Y" on a Champion indicates an extended tip. The originals were not an extended tip, but I don't think it can hurt anything in a Cub.

I suggest you go to a D-21 (or other brand of equivalent fit/heat).

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John *.?-!.* cub owner
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Re: Farmall cub spark plugs.

Postby John *.?-!.* cub owner » Tue Apr 04, 2017 8:55 pm

If it is a light duty machine, pulling a trailer, riding around, etc. or tends to burn oil I would suggest D21. If it gets worked hard doing quite a bit of mowing, plowing, disking, etc. and does not use much oil, which those plugs look like it does not, I would suggest D16. But that is just my opinion.
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Re: Farmall cub spark plugs.

Postby Peter Person » Tue Apr 04, 2017 9:07 pm

Keith,
Is it a regular or intermittent misfire?
In addition to changing the plugs, you could check the wires to make sure they are good. The distributor could have a hairline crack.
You may have a valve out of adjustment or crudded up and not closing all the way.
Clean the sediment bowl and make sure there is a good fuel flow.
Lots of possibilities!

Peter
1957 Farmall Cub "Emory", Fast-Hitch, L-F194 Plow & Colter, L-38 Disc Harrow, Cub-54A Blade, Cub-22 Sickle Bar Mower, IH 100 Blade

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J3 Driver
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Posts: 57
Joined: Mon Oct 31, 2016 11:38 am
Zip Code: 17241
Tractors Owned: 1976 C-160 Wheelhorse
1995 JD F525
1998 JD 955 with 70A loader and 54 blade
JD 71 planter modified for use on Sleevehitch
Brinly plow, disk, and cultivator.
Son has a 1957 Cub

Re: Farmall cub spark plugs.

Postby J3 Driver » Tue Apr 04, 2017 9:32 pm

It's regular. Fuel system was flushed out right after I bought it. So I don't think that's it.

I also was running 100LL (airplane gas) when I first got it. It helps to clean out the fuel system but also tends to foul plugs.

I'll get some new plugs tomorrow and give that a shot. It just started all of the sudden and is consistent.

Have a show this summer my boy wants to take it to so I have time. But have to get it working.

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J3 Driver
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Tractors Owned: 1976 C-160 Wheelhorse
1995 JD F525
1998 JD 955 with 70A loader and 54 blade
JD 71 planter modified for use on Sleevehitch
Brinly plow, disk, and cultivator.
Son has a 1957 Cub

Re: Farmall cub spark plugs.

Postby J3 Driver » Tue Apr 04, 2017 9:33 pm

Also taking the plugs to work tomorrow and will throw them in the tester. That will give me more information as well.

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J3 Driver
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Tractors Owned: 1976 C-160 Wheelhorse
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1998 JD 955 with 70A loader and 54 blade
JD 71 planter modified for use on Sleevehitch
Brinly plow, disk, and cultivator.
Son has a 1957 Cub

Re: Farmall cub spark plugs.

Postby J3 Driver » Wed Apr 05, 2017 7:57 am

Cleaned them up and tested them. They all tested well after a cleaning. Still Most likely will replace them though.

I know champion has had some issues with their plugs lately.

Looking at autolites or prestolites to replace them. What do you guys suggest. I've found a good cross reference to the D16s
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Re: Farmall cub spark plugs.

Postby Gary Dotson » Wed Apr 05, 2017 8:19 am

If you don't want to use the D-21 Champion, the 386 Autolite is a very popular choice.

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Re: Farmall cub spark plugs.

Postby Rjpoog1989 » Fri May 19, 2017 11:10 am

John *.?-!.* cub owner wrote:If it is a light duty machine, pulling a trailer, riding around, etc. or tends to burn oil I would suggest D21. If it gets worked hard doing quite a bit of mowing, plowing, disking, etc. and does not use much oil, which those plugs look like it does not, I would suggest D16. But that is just my opinion.


What is the downside to using hotter plugs is a tractor that's worked hard?
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Re: Farmall cub spark plugs.

Postby Smokeycub » Fri May 19, 2017 3:19 pm

For what it's worth, I run a rig very similar to yours, an F Cub with a Woods 59C1 mower and I've had great success with the 386 Autolites. I run it pretty hard for 2 to 3 hours at a time - runs great. Often when we do the "which plug is better" theme there are many varied opinions. Many have great luck with Champions too. In answer to question, the down side would be, from running a plug too cold tends to foul quicker and too hot of a plug will burn the electrodes rather quickly and (probably not a real concern on a Cub engine) would tend to burn valves. to reiterate what others have said it depends on how you work your Cub.
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Re: Farmall cub spark plugs.

Postby Rjpoog1989 » Fri May 19, 2017 6:20 pm

My 386 plugs fouled pretty quick on 2 cylinders. Could be that my valves were all outa adjustment, which is now fixed. Could also be compression, which I haven't even looked at yet. I'm new to this, so just looking for facts, not concerned about which brand is better based on opinions.
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Re: Farmall cub spark plugs.

Postby ntrenn » Tue May 23, 2017 11:01 pm

Have autolite 3116 in both cubs. The 63 ran for 20 years on the same set. Never had any luck with any champions in cub, h, or m.

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Re: Farmall cub spark plugs.

Postby 1956farmallcub/tripod » Wed May 24, 2017 8:09 am

i like autolite plugs my burns oil and havent fouled out they work awesome in the farmall tractors

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Re: Farmall cub spark plugs.

Postby tmays » Wed May 24, 2017 9:24 am

If you have the correct heat range plug, then fouling isn't a plug problem. It's a tractor problem. Fuel too rich can foul the plugs also. My plug of choice is Champion and never a problem with plugs. But there's folks here that hate them. If you're looking for fact, be prepared for the facts to be shrouded in opinion.
Thomas

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Re: Farmall cub spark plugs.

Postby ntrenn » Wed May 24, 2017 12:46 pm

Many years ago, super m with oversize sleeves pulling 7 ft flail mower...fouled plugs reguarly. Tractor would go through 15-20 gallons of fuel a day. Ran like a 280" sewing machine. Fouled champions. Didnt know then to use autolites...my rebuild on tbat engine is still running today...


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