Page No: 16
Issue No: 1
Date: 031100
Issued By: PJA
Easiest method of setting valves requires you to pull the prop
until exhaust valve on No.1 cylinder is fully depressed. Note the
O’clock position. Rotate prop 360
o
and adjust valve. (This puts the
cam and lifter at 180
o
to the peak lift). Repeat for each valve.
Heads and valves should be done at least twice at 5 hrs and 10
hrs on a new engine. You may also adjust each cylinders valves
on the firing stroke. (Firing order 145236 at TDC)
Remember to go over exhaust cap screws. They are fitted with
shakeproof washers to prevent loosening.
AIR DUCTS
Periodic research and development does cause at time changes to occur. Ones
supplied need to be fitted. See instructions manual.
FILTERS
Inspections down the track are a must for fuel and air filters. Conditions will dictate
when changed. The air box has a rubber flap to give partial inspection of filter.
SPARK PLUGS
NGK D9EA are recommended.
Plug gap of around .022” to .024”. Remember plugs are installed
at around 8 ft lb or given 1/2 turn after contact with head.
18mm Plug spanner used.
COMPRESSION TESTING
Condition of compression can be done by a compression gauge. Wide open throttle,
engine warm. Turn over on starter. Below 90 PSI would indicate removal of head
and possibly cylinder.
PRESSURE DIFFERENTIAL TEST (Leak down)
This is a much better test for condition of rings, bore, head sealing and valve. Engine in warm to hot
condition. This is the normal test used in aviation requiring specific equipment for the job. Pressure
input of 80 PSI; a second gauge reads the differential when supplying 80 PSI. This is done with piston
on TDC on the firing stroke. Prop needs to be restrained. The differential cut off is 80/60. Problems
can be better identified eg.
¾
BLOW BY (CRANKCASE VENT) - RINGS, BORE SEAL
¾
LEAKING FROM CARBY - INTAKE VALVE SEAL
¾
LEAKING FROM EXHAUST - EXHAUST VALVE SEAL
¾
HEAD LEAK - HEAD GASKET OR HEAD TO CYLINDER SEAL
Correction work can then be carried out.
Summary of Contents for 3300
Page 4: ...Page No 4 Issue No 1 Date 031100 Issued By PJA List of Amendments Page Amendment Date Issue...
Page 8: ...Page No 8 Issue No 1 Date 031100 Issued By PJA 1 1 Denomination of Cylinders...
Page 11: ...Page No 11 Issue No 1 Date 031100 Issued By PJA 3 0 PERFORMANCE GRAPHS...
Page 48: ...Page No 48 Issue No 1 Date 031100 Issued By PJA...
Page 52: ...Page No 52 Issue No 1 Date 031100 Issued By PJA...
Page 67: ...Page No 67 Issue No 1 Date 031100 Issued By PJA Drawing 9430064...
Page 89: ...Page No 89 Issue No 2 Date 031100 Issued By PJA...
