These should be adjusted when the engine is cold and should be set so that there is .003" clearance on the inlet and .006" on the exhaust. It is very important to observe these directions carefully and not to vary the setting from that which we specify. The tappets are adjusted by slackening off the tappet lock nuts and then turning the tappet end in the rocker until the correct adjustment has been obtained, then tighten up the lock nuts. When setting the clearances it is necessary to have the piston at top dead centre of compression stroke, (see page 14). A clearance gauge with six different thickness feelers, Part No. KA231 is available from Service Dept. at 1/- postage 2d

f131 3r p13 exhaust tappet