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by Pete.Silson
Fri Nov 11, 2016 9:52 am
Forum: Four stroke
Topic: Galvanising 4G exhaust manifolds?
Replies: 9
Views: 1355

Galvanising 4G exhaust manifolds?

I am currently overhauling a 1946 4G that hasn't seen the light of day since the early 1950's. When I started wire brushing rust from the cast iron manifolds to my surprise shiny silver patches came up out of the dirt. On closer examination it appears that the manifold had at one time been plated (a...
by Pete.Silson
Wed Nov 02, 2016 7:29 pm
Forum: Four stroke
Topic: 4G - three-part rocker spindle
Replies: 6
Views: 933

Re: 4G - three-part rocker spindle

Brian Thanks for the warning. I have taken out all the valve guides today and, although a couple of the exhaust guides were chipped at the "hot" end, none of them showed signs of contact with the underside of the top cap. As far as I can ascertain there is only one type of valve guide for ...
by Pete.Silson
Wed Nov 02, 2016 7:10 pm
Forum: Four stroke
Topic: 4G - three-part rocker spindle
Replies: 6
Views: 933

Re: 4G - three-part rocker spindle

Paul Both the spindles (or should I say 1.5 spindles) came out very easily with only a light tug. The remaining short fractured parts were slightly more of an issue since there was no threaded end to which to attach a bolt. This was solved with a squirt of compressed air fed up the hollow centre of ...
by Pete.Silson
Tue Nov 01, 2016 12:10 am
Forum: Four stroke
Topic: 4G - three-part rocker spindle
Replies: 6
Views: 933

4G - three-part rocker spindle

I've just stripped down the rocker box on my 1946 4G and find that the front rocker spindle is fractured in two places (see pictures). The fractures coincide with two of the rocker oil feed holes. Does anybody know if this is a common problem and, if so, should I be looking at finding replacements f...

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