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Gearbox / layshaft shimming issue.
Posted:
Mon Nov 19, 2018 10:52 pmby corrado
I've got a close ratio gearbox that when assembled correctly on a layshaft sits below the top of the layshaft. Hence I'm unable to shim it. I've got a selection of layshafts, Casa, FA Italia, MB, Sil, all with the same issue (a pacemaker gearbox works fine with all of them though). I've also got a couple of unknown branded layshafts that line up ok with the c/r gearbox but I'm a bit reluctant to use them in a tuned engine. Looking in Stickey's 3rd edition he mentions grinding down part of the layshaft close to where the oil seal goes. Page 81. I can't get my head around how this might help, as even if it allows the layshaft to be pulled through the bearing further it'll just take the gears with it I presume? It would seem more logical to turn down the top of the layshaft slight so that the gears sit higher but that would be too easy so I'm not seeing the obvious error of going that route. Anybody have any constructive comments to add?
Re: Gearbox / layshaft shimming issue.
Posted:
Mon Nov 19, 2018 11:05 pmby ULC Soulagent
have you tried flipping the loose gears the other way round maybe
Re: Gearbox / layshaft shimming issue.
Posted:
Tue Nov 20, 2018 6:07 amby ULC Soulagent
The grinding of the layshaft on page 81 refers too the middle pic and not the bottom pic with the o-ring seal.
Re: Gearbox / layshaft shimming issue.
Posted:
Tue Nov 20, 2018 11:41 amby HxPaul
corrado wrote:It would seem more logical to turn down the top of the layshaft slightly so that the gears sit higher
+1
Re: Gearbox / layshaft shimming issue.
Posted:
Tue Nov 20, 2018 2:20 pmby corrado
ULC Soulagent wrote:The grinding of the layshaft on page 81 refers too the middle pic and not the bottom pic with the o-ring seal.
Doh, it makes sense now, I only saw one pen.
Re: Gearbox / layshaft shimming issue.
Posted:
Tue Nov 20, 2018 10:09 pmby ULC Soulagent
Hope u get it sorted
Re: Gearbox / layshaft shimming issue.
Posted:
Tue Nov 20, 2018 10:17 pmby dscscotty
what make/manufacturer of the gearbox?
Re: Gearbox / layshaft shimming issue.
Posted:
Wed Nov 21, 2018 2:16 amby corrado
dscscotty wrote:what make/manufacturer of the gearbox?
It came via Italy but presumed Indian. SX200 1st, 2nd, 3rd with Li 150 4th. Same ratios as one made by DRT but no markings on it.
1/49 - 2/40 - 3/37 - 4/34 + 12-14-17-20
I was planning on trying it in place of my Li150.
Re: Gearbox / layshaft shimming issue.
Posted:
Wed Nov 21, 2018 3:24 pmby hullygully
think Broady & Cyclone do a shim that goes inbetween the loose gears & rear hub brg
soz it goes between the layshaft & brg derrrrrrrrrrrrr
Re: Gearbox / layshaft shimming issue.
Posted:
Thu Nov 22, 2018 8:13 pmby gp200ts1
A shim between the layshaft and bearing won’t help as it will not change the layshaft to gears clearance. You would need a shim that sits under the gears between them and the shaft.
Re: Gearbox / layshaft shimming issue.
Posted:
Thu Nov 22, 2018 10:10 pmby gaz_powell
AF do a shim for under the loose gears and the bearing