Part numbers - valves and spark plugs, believe it or not

Fri May 21, 2004 10:21 am

OK, guys - I said the questions would be coming - voila!!

My '62 Cub (serial 220068 J) has D16 plugs, which Carter and Gruenewald don't list. What's the equivalent, please?

C&G also lists 2 exhaust valve part numberws - which is correct?

Thanks in advance


Fri May 21, 2004 11:43 am

Exhaust valve part # is 251 261 R2 according to my TC-37F manual. Most guys use D21's instead of D16's especially if your tractor does not see much hard work. Cross references to AC C86 or use RD18Y.

Sat May 22, 2004 8:43 am

Tanksalot!!! I'm on it!

Sat May 22, 2004 9:20 am


BD gave you good advice. I used to run D-16's cause I have not been able to get D-21's. Big Big mistake :!:

If you cannot get D-21's, any good auto parts store should have the NGK or Autolite equivalents.

Wed May 26, 2004 7:52 pm

Hey Rudi, Big Dog,

How come you shouldn't use D16's? That is what was in mine and I just went to Canadian Tire and bought two sets. I don't use them very often, will the 16's cause some problems?


Wed May 26, 2004 8:09 pm


I had way too many problems with the D16's. :roll: :x Mostly it was excessive fouling as the plugs run too cold. In the summer it seemed ok, but the first time we got a cold snap, Ellie wouldn't start - period :!:

I double checked everything I could think of, cleaned the plugs, checked the gaps, checked the rotor, condenser, points, cables, -- you name it, I went through it. :roll: :? :roll:

Then one of the guys asked me which plug I was using -- aaaaahhh DUHhhh D-16's :idea: . Went to APM, couldn't get D-21's, or at any other parts house, so got the NGK equivalents. TaDa :!: :)

Ellie started first pop! Sooo, now I use equivalents. I am hoping to find some D-21's one of these days.... but the NGK's work really well. No more fouling either!

Hope that explains it a bit.

Wed May 26, 2004 8:09 pm

Maritimer, if you work your tractor regularly (and I mean work it) then you should not have problems with D16's. With light or intermittant use, the 16's tend to carbon up. So, on light use tractors it's better to run a hotter plug to help prevent fouling. So if you have a parade tractor, show tractor, trailer queen or whatever you want to call it, a hotter plug may help.

Wed May 26, 2004 8:21 pm

Thanks guy's, I alway's learn something new on this forum.

Wed May 26, 2004 9:15 pm

I have been running D-16s in at least one of my Cubs for quite a while. It gets mixed use. It gets loaded/unloaded to go to shows. Sometimes it gets to cultivate 250 feet of garden. But once in a while it gets a more extensive workout with a plow or blade.

I should also mention they were old stock, if that matters. No plug problems.