Ford 851 spark plugs

grandpa Love · Dec 14, 2020

Went to 2 different part stores neither one had autolite or champion plugs for this 851. But O'Reilly's said they crossed it to NKG. My problem.....look how long the threaded part is. I had these autolite plugs hanging on the peg board. Number ain't right , but they fit.... Any tips?

Sorry about the double picture

old · Dec 14, 2020

NGK number should be 3112. I use the NGK3112 plugs in all my ford tractors and also in my A/C tractors and they work well

rustred · Dec 14, 2020

obviously its the wrong plugs. dont put those in. the old chev 6 cyl's used those long reach plugs.

grandpa Love · Dec 14, 2020

What about the auto lite 295?

old · Dec 14, 2020

The NGK 3112 hold up better and longer then any of the China made auto lite plugs do

sotxbill · Dec 14, 2020

I remember a discussion about 6 months back that the 295 will fit and work but was NOT the correct plug due to the electrode being off a bit making it too cold or too hot. trouble is that they cross the old plug over to this number. which is close but not correct. Maybe someone remember this.

Steve@Advance · Dec 14, 2020

Wish I could see the business end of the H12. How do they look? If they have been in actual loaded work (not started and stopped putting around the yard), they should be a tan color.

The H12 is a mid to hot plug.

Don't use the long ones, you'll never get them out once csrboned up on the threads.
Cross Reference

grandpa Love · Dec 15, 2020

H12 came out of a tractor we bought this summer. No idea on how it was run before we got it.

johnlobb · Dec 15, 2020

I'm in agreement with Old. I love the NGK's!

Ford 851 spark plugs

grandpa Love

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old

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rustred

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grandpa Love

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old

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sotxbill

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Steve@Advance

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grandpa Love

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johnlobb

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