Changing a Muncie plastic speedo gear
04-26-2021, 03:03 PM
#1
Burning Brakes
Thread Starter
Changing a Muncie plastic speedo gear
My C2 is 10 mph slow on the speedo and I need to change the plastic gear. I bought the correct one and now would like some advice on what if anything I have to remove to get to the drive. I can see it ok under the car and the small bolt holding the gear in place is removable but is there enough room to pull the old gear out and insert the new one without removing anything else?
04-26-2021, 04:13 PM
#2
Safety Car
Once you remove the retainer bolt and the small retainer that the bolt holds in place, the gear and the cable adapter should pull straight out. Yours may be more or less difficult to pull depending on how long it's been since the thing was pulled the last time - in many cases the answer is never, so you may have 50 odd years of crud and a dried out o-ring seal to deal with. There is room, however.
04-26-2021, 05:15 PM
#3
Race Director
Member Since: Nov 2000
Location: Beverly Hills (Pine Ridge) Florida
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Remove (unscrew) the speedo cable first, and pull it out of the adapter. Then remove the adapter bolt & retainer..
While removing the adapter, make sure the speedo driven gear is coming out with it.
A few of us have pulled the adapter out, and seen the gear fall back into the trans..
If that happens, some say it is OK to leave it in the trans, but others (like me) have pulled the trans and removed the old gear.
Good luck,
Plasticman
While removing the adapter, make sure the speedo driven gear is coming out with it.
A few of us have pulled the adapter out, and seen the gear fall back into the trans..
If that happens, some say it is OK to leave it in the trans, but others (like me) have pulled the trans and removed the old gear.
Good luck,
Plasticman
Last edited by Plasticman; 04-26-2021 at 05:18 PM.
04-27-2021, 08:12 AM
#4
Melting Slicks
Member Since: Sep 2005
Location: merritt island fl
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C1 of Year Finalist (stock) 2019
2016 C1 of the Year Finalist
2015 C2 of the Year Finalist
Can't you just loosen the retainer bolt and rotate the retainer out of the way, rather than totally removing it?
04-27-2021, 09:34 AM
#6
Safety Car
04-27-2021, 09:45 AM
#7
Le Mans Master
Member Since: Nov 2015
Location: Really Central IL Illinois
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On R66, you can leave the bolt and retainer bar in place and loosen it enough to rotate it and the bullet (gear adapter) a little to disengage it from the slot.
I use a brake tool or bent paint can opener to put in the slot in the bullet to get it moving, however, don't pop it out too quickly or you may loose the old gear.
I put a new internal seal and external O-ring on the bullet for a couple of dollars. Some bullets don't have the internal seal.
When reinstalling the bullet with the new gear, align the slot with the bolt and retainer bar as you install it. Of course you may have to twist it once in.to align the slot and bar.
I use a brake tool or bent paint can opener to put in the slot in the bullet to get it moving, however, don't pop it out too quickly or you may loose the old gear.
I put a new internal seal and external O-ring on the bullet for a couple of dollars. Some bullets don't have the internal seal.
When reinstalling the bullet with the new gear, align the slot with the bolt and retainer bar as you install it. Of course you may have to twist it once in.to align the slot and bar.