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by john.whiting
Mon Mar 01, 2021 3:22 am
Forum: Four stroke
Topic: width of VH rod
Replies: 10
Views: 178

Re: width of VH rod

Side loading like that is likely caused by lack of a spacer on the mainshaft............I have an ES2 that would have been like that ,had it not leaked oil like a sieve,requiring a pull down .........In the ES2 there is no cush drive,no spring load,but in this case a piston had been fitted that was ...
by john.whiting
Sun Feb 28, 2021 10:12 pm
Forum: Four stroke
Topic: width of VH rod
Replies: 10
Views: 178

Re: width of VH rod

The width of the forging*,or the width of the race?......the race is normally proud of the forging both sides,if not then likely someone has surface ground the lot as an assy,for whatever reason....A new race will be correct width ,and all thats needed is to have equal protrusion...the hardened race...
by john.whiting
Sun Feb 28, 2021 4:08 am
Forum: Four stroke
Topic: Primary drive set up
Replies: 12
Views: 226

Re: Primary drive set up

Is the ID a tight fit on the spline?....If so ,it may be another out of spec part......without checking ,I dont see the engine spline being the same OD as the main gear in the gearbox.
by john.whiting
Sat Feb 27, 2021 11:55 am
Forum: Four stroke
Topic: valves and guides for NH
Replies: 37
Views: 1463

Re: valves and guides for NH

Delete ,delete,delete...its Daleks.....didja notice Daleks have solved the problem of needing flat floors?.....They can now fly.

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by john.whiting
Sat Feb 27, 2021 11:55 am
Forum: Four stroke
Topic: valves and guides for NH
Replies: 37
Views: 1463

Re: valves and guides for NH

I use Perkins 354 guides in all my singles,around $10 for a packet of 12......all have the 5/8 and 3/8 dimensions ,and I have standardised on 3/8 stems......These guides also have a short counterbore in the exhaust guide,to shield the exhaust stem from heat and abrasive material in the exhaust.....t...
by john.whiting
Fri Feb 26, 2021 12:04 am
Forum: Four stroke
Topic: VH oil tank.
Replies: 9
Views: 426

Re: VH oil tank.

You wouldnt believe this,but I just got another VH 1950 oil tank off ebay for the same price,and this one is very good........seller said it had been bogged ,but I think its been heavily sprayed with the old 3D filler used to be popular many year ago....maybe just to smooth out the contours............
by john.whiting
Thu Feb 25, 2021 1:30 am
Forum: Four stroke
Topic: NH 350 Valve Guide Removal
Replies: 18
Views: 463

Re: NH 350 Valve Guide Removal

if we assume the guide is cut from a bar in one drilling ,reaming,OD turning,end form and part off operation,then the hole should be exactly concentric with the OD....To get the extreme runouts reported ,the guide would have to be drilled in a separate operation,likely on a manual drillpress.......W...
by john.whiting
Wed Feb 24, 2021 7:30 pm
Forum: Four stroke
Topic: NH 350 Valve Guide Removal
Replies: 18
Views: 463

Re: NH 350 Valve Guide Removal

A guide 004 oversize on the OD has likely missed the grinding stage of manufacture.,this being a normal grinding allowance........if you look on some of the Chinese sale sites ,you can see massive lots of automotive components that have been rejected, for sale for fractions of a cent each in lots of...
by john.whiting
Wed Feb 24, 2021 10:09 am
Forum: Four stroke
Topic: NH 350 Valve Guide Removal
Replies: 18
Views: 463

Re: NH 350 Valve Guide Removal

You dont need a lathe to check guide ID to OD concentricity.......just spin the new guide on the new valve stem.....you can easily detect as little as a few thou eccentricity.......A loose guide /worn valve stem will make a cockeyed seating in the head ,and need a cut anyway.......regardless of the ...
by john.whiting
Wed Feb 24, 2021 10:02 am
Forum: Four stroke
Topic: NH 350 Valve Guide Removal
Replies: 18
Views: 463

Re: NH 350 Valve Guide Removal

The secret to removing guides from an iron head is to use a sufficiently heavy hammer.....around 3 to 4 lbs is good......Light hammers simply burr up the guide ,break small pieces out,and are other wise hopeless.......one or two well struck blows will remove any guide........they are only a light in...

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