How Do I Dissamble The Magneto to Grease Gears

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JohnMihevic
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How Do I Dissamble The Magneto to Grease Gears

Postby JohnMihevic » Wed Jun 22, 2016 12:38 pm

How do I get to the distributor gears on my 1948 Cub magneto? The manual says "every 2,000 hours the distributor gear and distributor gear chamber should be cleaned and repacked with IH magneto grease". I have searched the threads and understand that a thick type of wheel bearing or grease that won't separate out the oil is the best. I just don't know which end of the magneto to start from (the rotor end or the coupling end). If it is the coupling end, do I need a special puller?

Thanks,
John M.

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Re: How Do I Dissamble The Magneto to Grease Gears

Postby staninlowerAL » Wed Jun 22, 2016 4:09 pm

JohnMihevic wrote:How do I get to the distributor gears on my 1948 Cub magneto? The manual says "every 2,000 hours the distributor gear and distributor gear chamber should be cleaned and repacked with IH magneto grease". I have searched the threads and understand that a thick type of wheel bearing or grease that won't separate out the oil is the best. I just don't know which end of the magneto to start from (the rotor end or the coupling end). If it is the coupling end, do I need a special puller?

Thanks,
John M.


Have you looked at this GSS 1012 Manual? viewtopic.php?f=1&t=93201#p736056
The grease instructions refers to the rotor and pinion gears. Make sure you keep them timed correctly, the manual will show you how. You need a special puller to remove the coupler from the other end of the mag where it bolts up to the engine block. Stan

JohnMihevic
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Re: How Do I Dissamble The Magneto to Grease Gears

Postby JohnMihevic » Wed Jun 22, 2016 6:32 pm

I looked at the link and still can't tell if there are any gears I need to grease at the magneto coupling drive end. Do I have to dissemble anything at that end? I know about the rotor and pinion gear at the points and condenser end which need grease.

John M.

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Re: How Do I Dissamble The Magneto to Grease Gears

Postby staninlowerAL » Wed Jun 22, 2016 9:42 pm

As far as I know there is nothing on the end that connects to the block that needs operator service. I don't recall anything in GSS 1012 that says anything about it either. Someone else more knowledgeable will correct me if I'm wrong. When mine was completely disassembled at DSCF, there was a small amount of lubricant applied by hand to the shaft but that requires the special puller and a total disassembly.
EDIT: CORRECTION TO THE ABOVE.
Reference again to GSS 1012 page 4 shows the lube point for the mag forward end, a oiling cap/tube for the rotor bearing via the packing which wicks the oil down to the shaft. Page 10 of the same reference shows the 2 plugs which are to be removed and temporarily install zerk fittings to lube the distributor shaft with grease.

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Re: How Do I Dissamble The Magneto to Grease Gears

Postby JohnMihevic » Thu Jun 23, 2016 7:50 am

Thanks Stan. I found the oil cup for the forward end. I don't have the grease plug holes in the drive housing as shown for the ignition coil type distributor on page 10 of GSS-1012. I have the magneto and the housing is different. Maybe there is nothing else to grease. My question comes from my Cub owners manual (part #1004120R1 dated 5/23/47) that says on page 31 "After 2,000 hours of operation or at least every year the distributor gear and distributor gear chamber should be cleaned and repacked with IH magneto grease. We recommend this be done by you International Harvester dealer's serviceman."

John M.

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Re: How Do I Dissamble The Magneto to Grease Gears

Postby Stanton » Fri Jun 24, 2016 6:45 am

Page 22 of the manual, parts assembly #38 (consisting of parts #3, #4 and #5) and part #39. Manual link here: http://www.farmallcub.com/[ Sorry, direct links to manual section is not allowed. ]/files/Tractor%20Parts%20Manuals/TC-37A%20Parts%20Catalog%205-2-49%20-17B%20OCR.pdf

John posted a good picture below in the How To section (http://www.farmallcub.com/phpBB2/viewtopic.php?f=140&t=83108). Not the cover is shown w/o the two attaching screws (holes in the plastic cover). Remove screws, cover and distributor rotor (#5) and pinion rotor (#39). Thoroughly clean inside of cover and rotors, removing all old grease. Wipe/clean the inside of the distributor area out while you have the rotor cover off. Repack the inside cover with magneto grease or light weight grease and replace rotors, making sure to align them with the timing marks as shown in John's pic. The Parts books states a felt gear cover is also in there (#3), I've seen some with and some w/o. I remember cutting on out of regular craft felt and cut a new cover gasket (roll available at your local auto parts store and an X-acto knife). There are no other gears in a mag to grease.
Attachments
J4 Mag Rotor.jpg
Stanton
Image Circle of Safety

JohnMihevic
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Re: How Do I Dissamble The Magneto to Grease Gears

Postby JohnMihevic » Fri Jun 24, 2016 4:21 pm

I appreciate this detail Stan! I believe I have it all straight now. It's that little drive pinion and rotor gears that need the grease (besides the breaker point cam). Looks like if that pinion gets messed up/worn out you're in trouble. I think I saw in a post on the forum that the original rotors were metal. I think the new plastic ones would be better from the wear standpoint since the plastic would wear out before the metal pinion and that's easily replaceable.
Thanks again,
John M.

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Re: How Do I Dissamble The Magneto to Grease Gears

Postby Jim Becker » Sat Jun 25, 2016 7:42 pm

The original pinions were metal, the rotors were plastic. The rotors need to be insulators!

JohnMihevic
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Re: How Do I Dissamble The Magneto to Grease Gears

Postby JohnMihevic » Sun Jun 26, 2016 9:08 am

Don't know what I was smok'n when I wrote the above. The post I was referring to on the forum read . . . "J4 mag with what appears to be the original metal rotor pinion". . . I read too fast and took it to say "metal rotor". ...D-U-H ... I should have known the mag coil won't make much of a spark when going right to the Cub chassis.

Sorry for any confusion.

John M.


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