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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