Author Topic: check timing bush  (Read 488 times)

Online Angus

  • Suffolk, UK
  • Valued Contributor
  • ****
  • Join Date: Nov 2012
  • Posts: 491
  • Karma: 10
  • The A7
check timing bush
« on: 22.06. 2018 19:40 »
Some time ago (4 year 3000 miles) the 1960 A10 had clutch problems and I found the cush nut loose and thought I felt some end float (did not measure). Anyway yesterday I opened the timing side for the first time as the engine was a bit noisy and found the dynamo chain dry and loose. I thought I would check for play in the timing bush Musky style so tried to find his post about doing this but failed. From memory I believe he said leaver the end of the crank with the front nut on the oil pump, I did this with a longish screw driver and felt nothing. I did not put lots of pressure on, so I am hoping this is an adequate check and good news.
1961 A7 since 1976
1960 A10 Gold Flash Super Profile Bike
1958 Matchless G80 Project
1952 Norton Model 7 Plunger
1950 T100

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8162
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: check timing bush
« Reply #1 on: 22.06. 2018 21:46 »
G'day Angus.
I use a dial gauge with a magnetic base. Attach to the cylinder block, may require ties to secure properly. Put pointer on the top face of the nut and use a screwdriver between the pump and  under the nut. May take a few wiggles to expel any oil in there first and a push down and take the reading on the push up. Mine had 8 thou"  *eek*. Not bad for 35 years of abuse (with a few race meetings). Still running OK with 40/70 oil.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline stev60

  • A's Best Friend
  • ***
  • Join Date: Jan 2017
  • Posts: 70
  • Karma: 0
Re: check timing bush
« Reply #2 on: 22.06. 2018 22:34 »
This probably wont be approved of but I drilled and tapped a 5mm hole above the dynamo chain and fitted a countersunk screw, hardly noticeable and makes it easy to give the chain a squirt of chain lube, the previous times I had the cover off the grease appeared to lose contact with the chain, maybe it was the grade of grease 

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4540
  • Karma: 41
Re: check timing bush
« Reply #3 on: 22.06. 2018 23:26 »

 
Quote
...... drilled and tapped a 5mm hole ........
        *eek*

 The rivet counters'll get yea....should've done it in Whitworth    *smile*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online Angus

  • Suffolk, UK
  • Valued Contributor
  • ****
  • Join Date: Nov 2012
  • Posts: 491
  • Karma: 10
  • The A7
Re: check timing bush
« Reply #4 on: 23.06. 2018 09:07 »
Thanks Musky, I have put it back together now and now and no noticeable noise in bottom end. Would I have noticed/felt any movement, like I did the end float on the other end.
1961 A7 since 1976
1960 A10 Gold Flash Super Profile Bike
1958 Matchless G80 Project
1952 Norton Model 7 Plunger
1950 T100

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5413
  • Karma: 61
Re: check timing bush
« Reply #5 on: 23.06. 2018 10:14 »
Quote
the previous times I had the cover off the grease appeared to lose contact with the chain, maybe it was the grade of grease 

Cold engine - yes,
don't use high melting point grease, then when the engine is running and hot; grease will get to the chain
Better still IMO fit a belt drive
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8162
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: check timing bush
« Reply #6 on: 23.06. 2018 22:41 »
G'day Angus.
I doubt you would feel/see a couple of thou". I certainly can at 8 but there is no discernible noise (at the moment).
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online Angus

  • Suffolk, UK
  • Valued Contributor
  • ****
  • Join Date: Nov 2012
  • Posts: 491
  • Karma: 10
  • The A7
Re: check timing bush
« Reply #7 on: 24.06. 2018 08:58 »
Thanks again Musky  *beer*. I could not feel anything so good to go for the rest of the year  *smile*. I will check again in the winter although that is what I said last year and the year before that. She is a lot quieter with the dynamo chain adjusted to 1/4 inch play and grease in there, I can here the top end now  *problem*.
1961 A7 since 1976
1960 A10 Gold Flash Super Profile Bike
1958 Matchless G80 Project
1952 Norton Model 7 Plunger
1950 T100

Online cyclobutch

  • Wise & Enlightened
  • *
  • Join Date: Aug 2010
  • Posts: 1454
  • Karma: 14
Re: check timing bush
« Reply #8 on: 25.06. 2018 09:43 »
This probably wont be approved of but I drilled and tapped a 5mm hole above the dynamo chain and fitted a countersunk screw, hardly noticeable and makes it easy to give the chain a squirt of chain lube, the previous times I had the cover off the grease appeared to lose contact with the chain, maybe it was the grade of grease

Eureka. Shows how much attention I pay to these things. My timing case has a cap head screw sitting at pretty much that point. I always wondered why some damned fool PO would have done that.

Now I really had better get me coat.
Various, including ...
'58 Iron Head Flash Bitza