Replacing valve guides diy stylee...

You are completely wasting your time by putting anything in you freezer . You need liquid nitrogen. I did my type 4 guides no problems ,3 angle valve job . Run a tap in the guides , fit a bolt M10 from memory and just bash them out cold . I warmed up heads to I couldn’t touch them and using a turned bar guide just hammered them home . I made two seat cutters and cut the seats

This was also a WO 1700

 

..this is how I pressed old guides out..this was the easiest step tho..




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I think I calculated about a 2 thousandth of a mm difference in diameter for 15deg C drop on a 10mm tube in bronze... marginal gains as Mr Brailsford says.. can't comment on effect this would have on side friction as I didn't get that far before I tried again and it worked

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Did you ream the guides afterwards?

 

Trouble is as soon as it touches the head it will warm up .... I think 0.05 mm for 15 deg is way out

 

No ...your supposed to use `sized ` ball bearings but mine were fine on the new valves .

 

Yeah .. i couldnt find them so I figured if valves didn't rattle or got stuck they were good!..there is a tolerance in Bentley for valve tip movement I think?

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.. 0.002mm

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That is minute !