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by Mike Nash
Tue Aug 13, 2019 9:26 pm
Forum: Four stroke
Topic: Removing the ringds from a VB piston
Replies: 12
Views: 840

Re: Removing the ringds from a VB piston

Thanks for that Murray. I've tried soaking for weeks in acetone, hours in a sonic bath and heat cycling as suggested above but have had no luck and now I'm trying to cut them out with a small disc. But as Nev says one slip and I've a wrecked piston! Its nerve wracking and can only be done for a few ...
by Mike Nash
Wed Jul 10, 2019 8:17 am
Forum: Four stroke
Topic: Removing the ringds from a VB piston
Replies: 12
Views: 840

Re: Removing the ringds from a VB piston

Thanks for that idea Paul. I've got one but hadn't thought of it. I'll give it a go.
MikeN.
by Mike Nash
Tue Jul 09, 2019 6:02 pm
Forum: Four stroke
Topic: Removing the ringds from a VB piston
Replies: 12
Views: 840

Re: Removing the ringds from a VB piston

Thanks for your advice, gents. I've had the piston inverted and soaking the rings in acetone for 3 weeks but no luck on easing them. Heating and cooling was no help either so I'm using a small cutter disc in a small 12v hand held drill device to cut out a piece of the upper ring. I'll let you know h...
by Mike Nash
Thu Jun 27, 2019 7:55 am
Forum: Four stroke
Topic: Replacing a VB tappet guide
Replies: 4
Views: 339

Re: Replacing a VB tappet guide

VB tappet removal 27june219.jpg Thank you for your advice, gentlemen! I feared that after some 63 years in place it would be more difficult to remove than it actually was but with a sleeve and cheap threaded rod it came out quite easily and smoothly. The most difficult part was finding a suitable s...
by Mike Nash
Mon Jun 24, 2019 8:14 pm
Forum: Four stroke
Topic: Removing the ringds from a VB piston
Replies: 12
Views: 840

Removing the ringds from a VB piston

Dear all, I've this old piston that I hope has a bit of remaining life - if I can only replace the rings! The problem is getting the old ones out. It was running on Castrol R and the top two rings are well and truly stuck; I can't get even a dentist's tooth pick in at the ring gap (probably lack of ...
by Mike Nash
Mon Jun 24, 2019 8:05 pm
Forum: Four stroke
Topic: Replacing a VB tappet guide
Replies: 4
Views: 339

Replacing a VB tappet guide

Dear all, As you can see below I need to replace a VB tappet guide and I seek advice on how its done. It seems to be exactly 2 inches long and if I drive it down into the valve chest to remove it there seems to be exactly the same clear length above it in the valve chest before it hits the valve gui...
by Mike Nash
Fri Jun 14, 2019 8:21 am
Forum: Four stroke
Topic: VB Exhaust valve guide play
Replies: 13
Views: 848

Re: VB Exhaust valve guide play

". . . as it could allow entry of grit and dirt which would accelerate guide wear ?" No, not at all Bevan! The cunning VB design has everything sealed up. You'll see that the guide's top is within the exhaust port in the expected place and the bottom is within the valve chest. The parallel...
by Mike Nash
Thu Jun 13, 2019 7:57 pm
Forum: Four stroke
Topic: VB Exhaust valve guide play
Replies: 13
Views: 848

Re: VB Exhaust valve guide play

". . .would cause much smoke". Ah yes, that reminds me of a cooling solution I definitely DON'T recommend. As a teenager long ago and far away I had an M20 fitted with clapped out Gold Star racing cams. It went very well but then I had this brilliant idea to improve the barrel and exhaust ...
by Mike Nash
Wed Jun 12, 2019 8:46 pm
Forum: Four stroke
Topic: VB Exhaust valve guide play
Replies: 13
Views: 848

Re: VB Exhaust valve guide play

Bevan, Because the VB's tappets move axially in line with the valves there's not the rocking motion that the OHVs' guides have to put up with and so a clearance in the sidevalves that would seem excessive for an OHV seems to give little trouble for the VBs. It's all very hot in there but with the VB...
by Mike Nash
Thu May 23, 2019 7:16 am
Forum: Four stroke
Topic: So it begins
Replies: 56
Views: 2955

Re: So it begins

On expanding the photos of the rockers (inc the one above) I can see "cut marks". What caused them?
MikeN.

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