Dynamo drive removal

[Daveh67]

Is the dynamo sprocket on the idler gear held with a taper? Have attempted with a puller but seems very solid. So im asking before I do damage.
Dave

[Minto]

If I remember correctly it is on a taper. See photo, it looks like it is from that.

[Minto]

Found a better picture, definitely on a taper.
Hope that helps
Jase

[Daveh67]

Perfect thankyou. Now at least i can tighten the puller some more

[Greybeard]

Perfect thankyou. Now at least i can tighten the puller some more

When the puller is tensioned on the pinion try a sharp tap on the head of the puller screw.

[chaterlea25]

Hi Dave,
Those sprockets can be really tight on the taper and are easily bent by using a 2 or 3 jaw puller.. sometimes a quick blast of heat on the sprocket boss while the puller is under tension helps.
If I remember correctly the service sheet shows a drawing of using a soft drift and hammer on sprocket to break the taper

Jjohn

[Daveh67]

Sucessfully removed. Thanks to all.
Its time to assemble my bsa so more questions to come.
Dave

[Jim S]

Further to this subject, does anyone recommend putting something on the taper joint at assembly to ease the future disassembly? This would apply to the clutch centre also.

Jim

[Greybeard]

Further to this subject, does anyone recommend putting something on the taper joint at assembly to ease the future disassembly? This would apply to the clutch centre also.

Jim

I reckon putting a friction modifier on a taper would be counter productive.

[Colsbeeza]

Hello Dave,
Before re-assembly, makesure you read up on fitting the cork seal behind the dynamo sprocket. It also controls the idler pinion endfloat.
           https://www.a7a10.net/forum/index.php?topic=14313.msg118786#msg118786
Col

[BSA_54A10]

ABSOLUTELY NOT
Tapers are designed to be a tight fit and need to be installed dry & clean.

[Peter in Aus]

Go easy on tapping the end of the shaft when removing that sprocket, it is easy to drive the shaft through the idler gear a bit, I have found a few like that.
Peter

[Jim S]

ABSOLUTELY NOT
Tapers are designed to be a tight fit and need to be installed dry & clean.

I googled the topic "tapered shafts". Apparently putting a light lubricant on the taper then clamping it (torquing the nut) may make the taper fit even tighter, which is not desirable. I was wondering about a silver anti seize compound that is used on aircraft turbine engine shaft threads but I think following Trevor's advice above is the only way.

Assemble taper shafts clean and dry.