Author Topic: Timing side bush?  (Read 335 times)

Online Greybeard

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Timing side bush?
« on: 09.06. 2018 12:35 »
I've got my engine together again with your help but I'm wondering if I should have got a new timing side main bearing bush put in while I had it in bits. As I've found a local place that could do the work it seems more feasible. My measurements, (using internal callipers and a micrometer) show a difference of about 2 thou between bush and shaft. Is that acceptable? I found no ovality on the shaft.

Online muskrat

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Re: Timing side bush?
« Reply #1 on: 09.06. 2018 13:08 »
You lucky bugga, I dream of two thou. My A7 plunger has about 8 thou and still going (for how long is debatable) but I use 40/70 oil and don't go over 60mph  *bash*. She''l be right mate.
Or do you need more practice, I think you like it. *smile*
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline Colsbeeza

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Re: Timing side bush?
« Reply #2 on: 09.06. 2018 13:24 »
Hi GB,
I have been reading your rebuild with great interest. I have attached a graph which is interesting. Wish I could find the source. Seems 0.002" should last you quite a while. I certainly would not pull it down again. Nice to have Muskrats perspective. He has a way of keeping your feet firmly on the ground. *roll*
Colin
Colsbeeza
Australia

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Re: Timing side bush?
« Reply #3 on: 09.06. 2018 13:31 »
I have been reading your rebuild with great interest. I have attached a graph which is interesting.
Wow, my head!
Quote
Seems 0.002" should last you quite a while. I certainly would not pull it down again.
*wink2*

Online Greybeard

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Re: Timing side bush?
« Reply #4 on: 09.06. 2018 13:39 »
You lucky bugga, I dream of two thou. My A7 plunger has about 8 thou and still going (for how long is debatable) but I use 40/70 oil and don't go over 60mph  *bash*. She''l be right mate.
Or do you need more practice, I think you like it. *smile*
Cheers
I don't really mind the work, especially when it's going well, (I've got rocker box fitting down to a fine art) and as I still have not put the ancillaries back on the bike, if you'd said, "Yes, you need to do this", I would have. See, you have that much influence!  *smile*

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Re: Timing side bush?
« Reply #5 on: 09.06. 2018 13:40 »
How does one know when that bush is knackered? Is there a bottom end rumble?

Online muskrat

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Re: Timing side bush?
« Reply #6 on: 09.06. 2018 14:30 »
Usually a rod says hello  *pull hair out*.
Oil pressure drop. Without a gauge that's hard. Big end knock just before ^^^.
Any time I have the timing cover off I use a screwdriver between the pump and end nut to feel for movement.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

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Re: Timing side bush?
« Reply #7 on: 09.06. 2018 17:15 »
Any time I have the timing cover off I use a screwdriver between the pump and end nut to feel for movement.

Me too.

Offline Colsbeeza

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Re: Timing side bush?
« Reply #8 on: 09.06. 2018 22:07 »
I see the graph has been downloaded 17 times. Thought I'd better locate the source. Attached.
Colin
Colsbeeza
Australia