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Model G Oversized valve guides

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Model G Oversized valve guides
Started at 12:32pm on the 16th April, 2018 by Hardhat_Barry
Hardhat_Barry Subject: Model G Oversized valve guides
Does anyone know where I can get oversized valve guides for the Model G (1949)? Or does anyone have fix for a valve guide that can just be pushed in i.e. slightly loose?
Posted: 12:32pm 16th April, 2018
Wayne Subject: Model G Oversized valve guides
Part number 22641/5 - - plus 5 thou oversize guide - in stock
Posted: 12:38pm 16th April, 2018
Hardhat_Barry Subject: Model G Oversized valve guides
I rang up Hitchcocks this morning and they said they dont do them. I give up!!
Posted: 05:55pm 16th April, 2018
Hardhat_Barry Subject: Model G Oversized valve guides
Yay rang hitchcocks and they are sending one out free delivery!!!! Also found out about crank shims while I was on the phone :)
Posted: 06:09pm 16th April, 2018
Alan R Subject: Model G Oversized valve guides
Hi Guys---------from a machinist's point of view valve guides are a straight forward piece of turning, drilling and reaming.........Either cast iron or Phos. Bronze in bar form is readily available commercially.......If you are able heat the head up such that the old guides drop out and the new ones drop in then this is preferable to drifting them out with a hammer and in a cold state.....it helps keep the machined hole in the cyl. head in good condition............Don't forget to lap the valve in afterwards....PS}--- Even if you can't heat the head up you can always put the new guides in the freezer overnight...This'll reduce their size enough that they can then just drop into place......WEAR GLOVES !!!
Posted: 02:07am 17th April, 2018
Hardhat_Barry Subject: Model G Oversized valve guides
Yes I could have used my lovely Boxford CUD lathe and it was an option but it would have been a bit fiddly never tried to make a valve guide before.
Posted: 04:03pm 17th April, 2018
Alan R Subject: Model G Oversized valve guides
Hi Barry-------Good choice of lathe there, matey !! Taper roller headstock bearings, 1 Vee and 1 flat on the bedway which is induction hardened......Headstock Spindle takes a hollow drawbar collet attachment,other attachments include fixed and travelling steadies, BIG faceplate etc, etc.....Knocks spots off a puny Myford any day.......The valve guides are not that small really ( Try making 22BA bolts !!)......... Practice with some scrap Aluminium or Brass at first...............Go on !!....Be Bold !!......
Posted: 09:51pm 17th April, 2018
Alan R Subject: Model G Oversized valve guides
lathe_bob
Posted: 09:53pm 17th April, 2018
Alan R Subject: Model G Oversized valve guides
s_l225
Posted: 09:56pm 17th April, 2018

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