Author Topic: check timing bush  (Read 473 times)

Online Angus

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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 (becoming a project)

Offline muskrat

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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, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline stev60

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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

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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
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Online Angus

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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 (becoming a project)

Online bsa-bill

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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

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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, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online Angus

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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 (becoming a project)

Online cyclobutch

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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