Post by: chunterjam on February 12, 2016, 06:55:54 PM
Do I just put the gasket back on, put some gasket seal, get it skimmed or F it in the bin and get a good one?
Thanks in advance.(http://images.tapatalk-cdn.com/16/02/12/13c3207955ae27868b75094c74214164.jpg)(http://images.tapatalk-cdn.com/16/02/12/c419362fc5198a661af042116f8710ca.jpg)
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Post by: Trigger on February 12, 2016, 07:18:06 PM
Post by: ka-ja on February 12, 2016, 07:25:45 PM
Post by: jimv50 on February 12, 2016, 09:07:19 PM
He had to use a slab of plate glass and lots of elbow grease.
On another note, him and his brothers had the run of the shop and could have any bike they wanted, his favourite bike? Norton Dominator 500SS with Brooklands exhaust, can you imagine the noise!
Post by: Bryanj on February 13, 2016, 10:20:12 AM
Post by: chunterjam on February 14, 2016, 07:47:42 PM
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Post by: ka-ja on February 15, 2016, 09:12:07 AM
Everyone has their favourite grinding paste, but for what you are doing and the amount required ( valves take very little) it does not really matter,start with rough, and when the marks have almost gone, change to smooth to finish off, but don't use downward force, let the weight of the cylinder do the work on a good bed of paste in small circular movements.
Post by: chunterjam on February 15, 2016, 09:24:02 PM
That got 99% of the scrapes out. The. I did something that maybe naughty and did some localised rubbing down. Worked a treat on the liner but a bit of over rubbing left an ever so slight dip in a small part of the surrounding aluminium.
I think the gasket should fill the dip but am happy to be told otherwise
(http://images.tapatalk-cdn.com/16/02/15/d1ed8e45437b5bd08ccdf78f0b25ea29.jpg)(http://images.tapatalk-cdn.com/16/02/15/d9f8c62e8b9b24d8b4e2fcdd7a64af1e.jpg)(http://images.tapatalk-cdn.com/16/02/15/8a903c84dfcce131e023e5be4e2201db.jpg)
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Post by: chunterjam on February 15, 2016, 09:31:54 PM
Dip at 12.7 likely to cause me an issue?
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Post by: ka-ja on February 16, 2016, 09:20:21 AM
Post by: Trigger on February 16, 2016, 04:24:30 PM
Post by: chunterjam on February 16, 2016, 05:54:28 PM
@Ka-ja...The wet and dry was stuck down well with double sided tape. I was so surprised it held but it worked perfectly.
The general consensus from this and other forums is that it should be fine - the gasket seals on the steel liners and that some gasket sealant should sort the low spot. I've been recommended Hylomar blue.
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Post by: Bryanj on February 17, 2016, 07:18:43 AM
Post by: Alex jb on February 17, 2016, 02:13:16 PM
industrially, we always used grinding compounds as it tends to "suction" the two together while working them, you could almost feel the drag when something was flat!
Completely agree, I remember finding this and writing it up in my work book as an apprentice when my head fitter said well done for spotting it.
I was always told 'figure 8' pattern though, we'd get something thrown at us for circling while lapping bronze pistons slippers for hydraulic pumps.
Sorry OP, not much of use for you in my reply!
I would move away from paper if you have paste.
The glass is just a flat lapping block, just much cheaper than an industrial one, it is tough enough to take paste as long as you keep using as much of the surface as you can, try figure 8's
