AMC Box timing

Previously robert_tuck wrote:

After taking my box apart (several times!) I can't get the timing between the Quadrant and camplate, Getting my aged back down enough and in the gloomy interior of the box its hard to see 2 teeth align with the track, is there a better way?. At certain points the quadrant and camplate rub against each other too , maybe just because they are not timed right , but does not seem right either.

Hello ROBERT now try this out undo the short bolt that holds the selector cam plate in the gearbox and remove all the main shaft gears but fourth then fit the third gear and it dog refit the shaft that holds the dog selector refit second and first gears and this selectordog refit inner cover with the sector arm in fourth gear the arm should be looking up Ward then make sure the selector cam plate is in fourth gear to mate up the the selector arm you may have to do some judging so the teeth mate up right you can push out the cam plate so then mate up so it in fourth gear when you have done this now with two nuts fitted on you can move the main shaft and try going down the gear box for fourth to third then second the neutral and first then go back to second and fit the rest of the nuts and then the outer cover do up the screws and then you can move the gear lever back to neutral the then first and up the gearbox while moving the main shaftaround so you get all gears selectingright and refitbolt for the cam plate do make sure the ball and spring for the cam plate is working ok when filling with gear oil high poly 80 take out the small bolt in the out cover at the back of where the kick start is and fill with oil untiloil runs for this bolt hole that your oil level replace the bolt and fit inspection plate with the two screws now have fun yours anna j

Just by-the-by, I find that the undisturbed oil level screw makes an excellent level mark when putting oil into the gearbox via the inspection cover!

Previously Colin Peterson wrote:

Just by-the-by, I find that the undisturbed oil level screw makes an excellent level mark when putting oil into the gearbox via the inspection cover!

hello yes that right I forgot this one but hoped he knew where to fill the gearbox from have fun yours anna j

I forget stuff all the time! It's a funny one though, all the manuals say to add oil until it runs out the level hole, but leaving the screw in saves clearing up the mess. They might just as well have moulded in a level marker, and saved a few pennies in the manufacturing â unless I'm missing something ...

Previously Colin Peterson wrote:

I forget stuff all the time! It's a funny one though, all the manuals say to add oil until it runs out the level hole, but leaving the screw in saves clearing up the mess. They might just as well have moulded in a level marker, and saved a few pennies in the manufacturing â unless I'm missing something ...

hello yes your brain in over drive and thinking too much now sit back with a nice cup of tea and a biscuit and realacks with classicFM and put brain torest have fun yours anna j

Previously anna jeannette Dixon wrote:

hello yes your brain in over drive and thinking too much now sit back with a nice cup of tea and a biscuit and realacks with classicFM and put brain torest have fun yours anna j

Haha yes too true, thanks anna j!

The wheel will need turning as there are very few static conditions all 4 gears are available if any, but the force required for selecting each gear should be the same.

It has to be related to the inner cover or something that the inner cover is resting on or touching, that's both shafts of course. Have you looked at the Gearbox pdf which has been posted a couple of times, it shows you the parts that move for each gear change and it allows you to isolate the 2 to 3 and 3 to 4 moving parts, these and the 2 shafts must be the prime culprits especially any common to both gear changes.

The other option is to only fit the gears and parts for 4th, 3rd and 2nd and see if anything improves by then taking further parts out one at a time.

For my BSA Unit singles I have a spare scrap timing side crankcase with a window cut in it to see what's going on inside the gearbox, a scrap AMC box could be used in the same way.

hello well you can give me a ring at any time my phone number is 01430 430831 mostlyaround after 4 pm as I work a 3 day a week has us over 60s do in our days and there should be a bronze spacer between four and third its does get worn over time now ride carefully and have fun Yours Anna J

Previously anna jeannette Dixon wrote:

hello well you can give me a ring at any time my phone number is 01430 430831 mostlyaround after 4 pm as I work a 3 day a week has us over 60s do in our days and there should be a bronze spacer between four and third its does get worn over time now ride carefully and have fun Yours Anna J

Hello Anna,

Sorry but there is definitely NO bronze thrust washer in an AMC gearbox as there is in a dollshead or laydown box. The end of the mainshaft is threaded to allow a nut to tighten against the small mainshaft bearing. This gives much better operation of the clutch.

The AMC gearbox also has the roller bearings and hardened thrust washer in the sleeve gear deleted.

Previously ian_richtsteig wrote:

Previously anna jeannette Dixon wrote:

hello well you can give me a ring at any time my phone number is 01430 430831 mostlyaround after 4 pm as I work a 3 day a week has us over 60s do in our days and there should be a bronze spacer between four and third its does get worn over time now ride carefully and have fun Yours Anna J

Hello Anna,

Sorry but there is definitely NO bronze thrust washer in an AMC gearbox as there is in a dollshead or laydown box. The end of the mainshaft is threaded to allow a nut to tighten against the small mainshaft bearing. This gives much better operation of the clutch.

The AMC gearbox also has the roller bearings and hardened thrust washer in the sleeve gear deleted.

Hello well my Norton Manxman 650 built December1960 has a bronze bush in betweenthe thirdand fourth gears and has bronze sleeve bearings in the gears, My 1954 Norton Dominator model 88 has the roller bearings in the sleeve gear on fourth gear within a bronze housing and a bronze bush to in-between third and fourth gears. And this gearcluster is a semi close ratio from an international race bike it's a higher gear ratio to normal now do have fun and be carefulwhen out riding yours anna j