Revision: 2
Date: 11-15-19
VASHON AIRCRAFT RANGER R7 MAINTENANCE MANUAL
5.7.10-3
PROBLEM
PROBABLE CAUSE
REMEDY
Reference in this
manual
Engine does
not start
Insufficient fuel
Fill tank
Fuel does not reach
carburetor
Clean tank vents,
blowout supply line,
clean filter, replace shut-
off valve, check for
obstruction in fuel flow
transducer
5.7.12
Carburetor float valve
stuck shut
Remove carburetor and
repair
5.7.13
Carburetor screen or
jets plugged
Remove and clean
5.7.13
Insufficient priming
(weak explosions)
Repeat starting
procedure with more
priming
Excess priming (puffs
of black smoke)
Clear cylinders by turning
propeller several
revolutions with ignition
switch “OFF” and throttle
wide open
Engine hot (vapor lock
in fuel system)
Disconnect fuel line at
carburetor and purge
system
5.7.12
Low battery charge
Recharge battery
5.7.20
Cold oil
Turn propeller by hand
several revolutions to
break loose congealed oil
Spark plugs fouled.
Remove and clean.
Check gaps.
5.7.15
Spark plug cables
defective.
Replace defective parts.
5.7.15
Magneto breaker
points burned or
fouled.
Remove oil from breaker.
Replace defective
condenser.
5.7.15
Magnetos incorrectly
timed internally or to
engine.
Check and correct timing
to engine. Overhaul if
internal.
5.7.15
