Play-Do works, too.
On Wed, 14 Jun 2006 09:55:41 -0400 (EDT) "John D. Caffrey"
<jdc6@lehigh.edu> writes:
> Hi Joe,
> During a trial assembly you would place modeling clay on top of the
>
> piston, install the top end and adjust valves, and turn the engine
> through several revolutions. Then when you remove the head you can
> slice through the impression left in the clay with an exacto knife
> to
> measure the compressed thickness. Go slow while turning over the
> engine, and if you feel any resistance, stop and investigate to
> prevent
> damage to pistons or valve train.
> John
> Fogelsville, PA
>
> Joe Lansing wrote:
>
>
> >I'm an amateur going through the reassembly of my
> >1275. This week I'm timing the cam, and Kent says:
> >
> >After having timed in the camshaft check that there is
> >no valve to piston contact. The minimum clearance
> >between the piston and the valve should be 1.5mm. In
> >multi-cam engines ensure there is no valve to valve
> >contact.
> >
> >How does one check this?
> >
> >Thanks,
> >
> >Joe Lansing
> >62 Sprite
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