Wide Ratio Gearbox And 1380 Engine Build by AndyMiniMad

3 minute(s) of a 171 minute read

Back to the gear box build today, I placed the fine roller bearing on the shaft and then the 3rd gear over the bearing as shown here.

I should say that its important that all the bits are totally clean. Any grit or dirt in the bearings at this stage could cause an expensive failure.
Next its time for the spring and retaining pin. You might find it easyer to put the spring and pin into the shaft before sliding 3rd gear onto the bearing.

Then I slid the retaining ring down and lined up the groove on the ring with the pin. I used a very small bladed screwdriver to push the pin into the shaft which then allowed the retaining ring to slide fully home. Once its down as far as it can go simply turn it untill you here the click of the pin locking it into place.

Now its time for 2nd gear, all these bits go on from the other end of the shaft. So fine needle bearing first then the spring in the hole with the two pins on the ends of the spring. Notice the hole goes right through the shaft at this gear.
Next slide 2nd gear on to the shaft and over the pins, I found it quite fiddly to hold the shaft and squish the pins in far enough to slide the gear over. Would be easyer if I had a vice to hold the shaft. ( Are you listening WIFE I need a vice!!!)

And now for the worst bit, the retaining ring goes on the same as before but this time there ars no grooves to worry about. just line up the two holes in the gear with the pins then use a thin rod of some sort, (I used two very small allen keys), to press the pins back into the shaft allowing you to slide the ring over as before and turn untill you here the clicks. ( Did i mention that a vice would be really handy at this stage).