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Cox GTP Nissan ratchet starter gear
Page 1 of 1
Cox GTP Nissan ratchet starter gear
Jason_WI Fri Jun 23, 2017 6:07 pm
After looking to purchase one on eBay for a very long time I finally found a gear that will work to make a ratchet starter gear used on the GTP Nissan and others. This part isn't even listed on the parts breakdown in the manual. Unobtanium.
I found a Modulus 1 12 tooth pinion that is close. The teeth are not as tall but it meshes with the zip ratchet.
The gear is hardened and a file would not touch it. I heated it a dull red with a torch to anneal it so I could turn it on the lathe.
After turning it down and boring the hole it works perfect.
The picture is rotated. The gear on the bottom is the one I made. The one that came with the GTP is on top.
I found a Modulus 1 12 tooth pinion that is close. The teeth are not as tall but it meshes with the zip ratchet.
The gear is hardened and a file would not touch it. I heated it a dull red with a torch to anneal it so I could turn it on the lathe.
After turning it down and boring the hole it works perfect.
The picture is rotated. The gear on the bottom is the one I made. The one that came with the GTP is on top.
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 49
Location : Neenah, WI
Re: Cox GTP Nissan ratchet starter gear
Marleysky Sat Jun 24, 2017 10:53 am
Jason, that's some very nice work. Were you just looking through a "gears and Pully's" catalog to see if you could find something close to the unobtanium gear, or just playin "MacGyver" to get the starter working?
Marleysky- Top Poster
-
Posts : 3618
Join date : 2014-09-28
Age : 72
Location : Grand Rapids, MI
Re: Cox GTP Nissan ratchet starter gear
Jason_WI Sat Jun 24, 2017 11:52 pm
Basically eBay and google. I know mod .8 is 32 pitch and what my RC10GT uses for gears. This is smaller than the Cox ratchet gear pitch. Started looking for larger size gears and mod 1 seemed close. Found a 12 tooth with a long boss so the set screw would be machined off. After turning to size I filed the flat spots that drives the ratchet drum.
I had all the parts to make a spare GTP engine but the ratchet gear.
I had all the parts to make a spare GTP engine but the ratchet gear.
Jason_WI- Top Poster
-
Posts : 3123
Join date : 2011-10-09
Age : 49
Location : Neenah, WI
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