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1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Thu Jul 11, 2019 6:06 pm
by Cov Lad
My recently purchased 1955 G2 has one of the studs holding the exhaust rocker block snapped below the casting, I believe two more have stripped threads on the head. The cylinder head already has a spark plug insert repair. I am wondering if I should have the cylinder head repaired or try and source a cheap second hand replacement. I have been advised that Indian cylinder heads may not be good quality - I'm not sure if this is true or not. I'm pretty sure the cylinder head is alloy. Any thoughts from experienced heads would be most welcome.
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Thu Jul 11, 2019 7:16 pm
by Adrian
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Thu Jul 11, 2019 7:34 pm
by Cov Lad
I have checked to no avail, I am wondering if I might find one at founders day event.
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Thu Jul 11, 2019 7:42 pm
by Adrian
Well they've got one listed now, search for USED 2660!
A.
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Thu Jul 11, 2019 8:31 pm
by Cov Lad
Thanks, just what I need, it says that inlet ports have been opened up, does this mean my valves would be too small, is easy enough to remove and refit the valves?
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Thu Jul 11, 2019 9:17 pm
by Cov Lad
I have just seen this one one fleabay
https://www.ebay.co.uk/itm/Royal-Enfiel ... SwctddIbAA
It looksa bit rough looking though.
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Fri Jul 12, 2019 4:32 pm
by Adrian
That's a Clipper head which is cast-iron, not alloy like the Bullet's head. Go for our hosts' used Bullet head and they might have some valves to suit it - give them a ring Monday and ask.
A.
Re: 1955 Enfield 350 G2 Bullet Broken and stripped rocker studs - repair or replace cylinder head
Posted: Sat Jul 13, 2019 3:54 pm
by stinkwheel
If it's a "good" head otherwise, I'd be tempted to just go the whole hog, get it fixed and fit inserts on all the remaining studs before they go.
It might be a good job to take to a light engineering shop with a GOOD pillar drill/mill though (unless you have your own). If they know they're going to be fitting inserts, they'll be able to line it all up, clamp it down onto a level bed and drill out the broken stud in no time. Also gets the holes tapped in bang on square, my local guy puts the tap in the drill chuck he just drilled the hole with and winds it down by hand.
A head with inserts all round is probably less likely to have a problem than a standard one. If you're going to put fine pitch threads into alloy, at least the larger diameter of the insert will spread the load over a larger surface area.