Rotec AEROSPORT R2800, Руководство по эксплуатации, Страница: 79 / 87

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Routinely perform general visual checks for leaks, security and abrasions. If leaks are detected, have the exhaust sys-
tem repaired or engine damage could result.
Tappet clearance must be set at COLD 0.10mm (0.04”) for both the intake and exhaust valves.
The easiest technique to set the tappets is described as follows:
• Firstly the Rotec Radials, like all four stroke engines fires each cylinder every alternate revolution so the piston ar -
rives at Top Dead Centre (TDC) twice every four strokes of the piston. The two (TDC) stokes are named both the
exhaust stroke and compression stroke.
• We are only interested in the compression stroke as this is when the valves are both shut and the piston is com-
pressing the mixture while it ascends toward the head or TDC.
• With one spark plug of each cylinder removed a simple method is to place one of your fingers over the open
spark plug hole of the first cylinder to be tappet adjusted
• Rotate the engine by hand until you feel the air trying to rush past your finger this is the piston ascending toward
TDC compressing the air in the cylinder as it does. When the piston reaches TDC and then descends back down
the cylinder bore, a suction will be felt on your finger stop and come back by reversing rotation. You are now very
close to where you want the piston and valves to be.
• Now place a blunt thin rod like a pen or dowel (don’t drop it) and feel the piston come up, jog the crank back and
forth until you are approx. at TDC on this the compression stroke. This is close enough for setting the tappets only.
• Now set the tappets on this cylinder using a 0.10mm (0.04”) feeler gauge shaped with a bend at the end so as
to sneak it between the tappet and the valve stem from the rear of the rocker box. Repeat this technique on the
remaining cylinders tappets in a counter clock wise direction (Front perspective) until all 14 tappets are set.
• Go around once again to confirm that all tappet lock nuts are tight.
• Also care should be taken not to “dislodge” a push rod from the cup of the rocker as this will jam and may bend a
push rod in the rocker box if not detected. This is more prevalent on the horizontal cylinders. A thin piece of weld-
ing wire with a small 90deg bend at its end can aid re- locate the fallen pushrod. Rocker pin removal is advised
when attempting to re- locate pushrods.
• Correctly adjusted tappets are vital for valve train longevity not to mention smooth and quiet valve operation.
• Check the condition of the 1.5mm o ring cord / gasket and replace if needed, also check the copper washers under
the M6 rocker cover cap screws.
Check for tightness, re-torque if necessary (see torque spec chart p. #).
EXHAUST & INTAKE SYSTEM
TAPPET ADJUSTMENT PROCEDURE
ALL BOLTS & NUTS
WARNING:
Make sure both spark sources and fuel supply are switched OFF.
NOTE
:
The M10 x 1mm ‘O-rings’ at each end of the rocker pins, these pins when tight, NEVER lock and can rotate with span -
ner force only.