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Oct 23, 2016 1:14 pm
Oct 23, 2016 1:14 pm
Subject: Re: G9 gearbox
Well, Adam, I dont know about "on your shoulder" but I will say a few prayers for you if you insist !
When (or before) you take the gearbox apart it is worth checking one other thing. In my (limited) experience the G9 casing can easily crack between the oil drain hole and the front layshaft bearing hole. This is definitely a weak spot. It is also often the cause of oil leaks from this area. My advice is not to try and get it welded. Apart from impregnation of oil in the casting over 80 years or so it seems that the original aluminium casting was very poor and had lots of impurities. My solution (which has reduced leaks by about 95%) was to make up a welded ali "bandage" which was secured to the oil filler hole (under the filler plug) and picked up on one of the studs for the layshaft bearing cover plate. Before bolting on the "bandage" I smeared it with a modern ali epoxy glue as a "belt and braces" fix. You may be able to improve on this mod ! I can let you have a photo of my mod if you have this problem. I dont think it looks very noticeable and you would have to know your G9 gearboxes very well to spot it !
I understand that new G9 gearbox casings are available from LMB but (understandably) they are very expensive.
Well, Adam, I dont know about "on your shoulder" but I will say a few prayers for you if you insist !
When (or before) you take the gearbox apart it is worth checking one other thing. In my (limited) experience the G9 casing can easily crack between the oil drain hole and the front layshaft bearing hole. This is definitely a weak spot. It is also often the cause of oil leaks from this area. My advice is not to try and get it welded. Apart from impregnation of oil in the casting over 80 years or so it seems that the original aluminium casting was very poor and had lots of impurities. My solution (which has reduced leaks by about 95%) was to make up a welded ali "bandage" which was secured to the oil filler hole (under the filler plug) and picked up on one of the studs for the layshaft bearing cover plate. Before bolting on the "bandage" I smeared it with a modern ali epoxy glue as a "belt and braces" fix. You may be able to improve on this mod ! I can let you have a photo of my mod if you have this problem. I dont think it looks very noticeable and you would have to know your G9 gearboxes very well to spot it !
I understand that new G9 gearbox casings are available from LMB but (understandably) they are very expensive.