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Antique Engine Archives All archived posts from 1999 to 2004 when SmokStak was on EnginAds. This is a read-only board.

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1935 FM ZC 3 HP Sparkplug


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  #1  
Old 03-12-2001, 11:22 PM
Dale
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Default 1935 FM ZC 3 HP Sparkplug

Hi, I just got a 3 hp FM Z Style C engine that was made in 1935 from the ser # list.It came with no sparkplug and was wondering if anyone knew the new number(or old # and will cross it with a new number) so i can get a sparkplug from a local suplier.Thanks Dale
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  #2  
Old 03-13-2001, 08:16 AM
Ed Kinch
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Default Re: 1935 FM ZC 3 HP Sparkplug

If it is a 7/8 thread with a gasket it would be an autolite 3076 or a champion W18.If it has an 18mm thread it is a D14 in champion.
  #3  
Old 03-13-2001, 10:52 PM
Dale
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Default Re: 1935 FM ZC 3 HP Sparkplug

I believe the spark plug hole is a pipe thread type.The 7/8 won't fit i would think.Any more ideas??? Thanks again .Dale
  #4  
Old 03-13-2001, 11:06 PM
Tony Page
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Default Re: 1935 FM ZC 3 HP Sparkplug

1/2" pipe is 7/8" dia. Like some sparkplugs. Tony
  #5  
Old 03-13-2001, 11:36 PM
Ken Majeski
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Default Re: 1935 FM ZC 3 HP Sparkplug

If it's 1/2 pipe thread it would be a champion A-25 or autolite 3095 same as the model T ford.


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  #6  
Old 03-13-2001, 11:37 PM
Ken Majeski
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Default Re: 1935 FM ZC 3 HP Sparkplug

If it's 1/2 pipe thread it would be a champion A-25 or autolite 3095 same as the model T ford.


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  #7  
Old 03-13-2001, 11:42 PM
Bill Garman
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Default Re: 1935 FM ZC 3 HP Sparkplug

If it is a pipe thread that you need, try a champion 525 or autolite# 3095. You will find the autolite to be much cheaper, it's what I use in my Cushman engine.
  #8  
Old 03-14-2001, 12:19 AM
Tom
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Default Re: 1935 FM ZC 3 HP Sparkplug

The 3 HP FM Z, style C uses a 7/8 plug. Your local parts house will probably come closest to matching this with a Champion W-18. I've worked on one of these engines several times, and know from experience that the 7/8 plug is correct. The Champion W series plugs are 7/8. You might run up on a W-14, which will fit, but be a colder plug.
  #9  
Old 03-14-2001, 11:48 AM
Scott
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Default Re: 1935 FM ZC 3 HP Sparkplug

I just sold a 1935 ZC that had a half inch pipe thread plug. If you have the head off, take it to your local John Deere dealers parts department, and they'll set you up.
  #10  
Old 03-14-2001, 11:24 PM
Dale
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Default Re: 1935 FM ZC 3 HP Sparkplug

It was a champion 25 and it fits nice.Thanks Everyone Dale
  #11  
Old 03-14-2001, 11:27 PM
Ed Deis
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Default Re: 1935 FM ZC 3 HP Sparkplug

The confusion here is because the earlier 3HP style "C" used a 1/2" pipe thread. I'm not sure what year but possibly the late 3HP C may have used a 7/8" but I believe this change wasn't until the model "52" which is identical except it used a flange mount mag that bolted to c/c cover and the 7/8" plug. The 3HP "C" used a base mount mag with a gear hole cover with a felt for sealing and held on with two screws. Ed
  #12  
Old 03-16-2001, 12:47 AM
Tom
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Default Re: 1935 FM ZC 3 HP Sparkplug

Thanks for clearing this up, Ed. I know that the engine I have worked on in the past, is a 3 HP FM Z, style C. And it does take a 7/8 plug. I've replaced several of them, each time with a Champion W-18, as a local auto parts store happens to stock that particular plug.

The mag is a flange mount, as you have stated.
 


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