|
Description
|
Probable Cause
|
Correction
|
|
Valve
is hard to turn
|
Worn
out/dry
|
Grease seat and replace shaft seal
|
|
Fuel
stain at selector shaft
|
Worn out/dry
|
Grease seat and
replace shaft seal
|
|
Fuel
bypassing valve
|
Worn out, foreign debris caught in seat
|
Replace
Valve
|
|
Handle
is loose after installation
of new clevis pin
|
Worn out handle and or selector valve
shaft
|
Replace handle/valve assembly
|
|
Valve
handle is attached to
selector shaft with a screw
on type (handle)
|
Non approved valve
|
Replace with approved part assembly
|
|
Valve
turns with no feel or tank position detenting
|
Wrong selector valve body or worn out detent
assembly
|
Replace with approved
part assembly
|
|
Osborne Kit P/N 35668-1(-1 kit with extended range 74 usable
tanks), -5 and –6
Brief Description: The Osborne selector valve P/Ns 55034 and HE
763 replaces the factory selector valve, from four (4) position
to a five (Osborne) (5) position accommodating the Tip Tanks.
|
|
Description
|
Probable Cause
|
Correction
|
|
Stiff
detents
|
Worn rotor plate
|
Overhaul Valve
|
|
Low
fuel flow on take off
|
Selector valve filter
assembly improperly installed
|
See Beechraft model 35 parts
catalog
page 2-325
for other information
|
|
Low
fuel flow in level Flight
|
1. Loose plumbing
connection
2. Not using low boost
|
Check all plumbing/filter
connections for tightness
See POHs/AFMs for operating
instructions
|
|
Fuel
returning to both main
tanks
|
Selector valve is internally bypassing
|
Overhaul
|
|
Valve
turns hard or rough
|
Internal seals dry or
worn out
|
Overhaul
|
|
Valve
is hard (to turn)
from
one tank selection to another
|
Internal seals dry or
worn out
|
Overhaul
|
|
Weak
tank position detents
|
Weak detent ball/spring
rotor plate worn
|
Overhaul
|
|
Fuel
filter area has fuel stain
or is seeping
|
Hard selector valve filter assembly seals, filter canister
assembly bolt too tight
|
Replace seals
|
|
Osborne Cross Feed Valve P/N 55028
Kit applications: 35668-1 Models N35, P35,
B33, C33, C33A, E33, E33A, E33B, E33C,(with 74 gallons usable
factory installed extended range tanks) –5 Models 35-C33A,
E33A, F33A, S35, V35, V35A, V35B V35BTC , -6
Models 36, A36, A36TC Bonanza and Navion Kit P/N 11982
(TT2-1)
This valve is used in level fight when Tip
Tank is selected to achieve “cross feed” of both (LH and RH)
Tip Tanks usage.
|
|
Description
|
Probable Cause
|
Correction
|
|
One
Tip Tank feeds faster
|
1. Weak cross feed valve
2.Plugged Tip Tank vent
line
|
Replace valve
Clear slow feeding
Tip Tank vent line
|
|
No
cross feed occurring when
cross feed switch is
selected “open”
|
1. No power to valve
2. Valve is not engaging
|
Check power source to valve
Bad
coil replace valve
|
|
Tip Tank fuel is bypassing (siphoning) to opposite Tip Tank; in static condition.
“Not in flight”
|
Seal in valve is worn out
|
Replace valve
|
|
Osborne Kit P/N
35668-7 Bonanza Models N35, P35, S35, 35-B33, 35-C33, 35-C33A,
E33A, F33A, V35, V35A, V35B, V35BTC, –8 Bonanza Models 36,
A36, A36TC, G36
Electric Transfer
System: Fuel lines
are readily routed forward of the main wing spar connecting to
the Transfer Pump. The Transfer Pump Assembly is located near the forward wing
inspection cover, accommodating pump filter change and
maintenance ease. The
Tip transfer outlet fuel line exits into the main tank through
an existing metal inspection cover (or inlet fitting); Tip fuel
is electrically transferred, shutting off automatically when Tip
Tanks empty.
Auto shutoff switch
description:
Osborne uses two
(2) types of shut off switches.
These switches are know as (Auto shut off switch).
Switch descriptions are known as pressure and flow
(alternate) switch.
The following
trouble shoot is for the “Pressure switch”.
|
|
Description
|
Probable Cause
|
Correction
|
|
The
transfer pump will not arm (stay on)
|
Switch is out of adjustment
Pump
is weak or in-op
|
Recalibrate
Replace Pump
|
|
The pressure switch will not shut off pump when fuel flow is interrupted or when Tip Tank empties.
|
Switch is out of adjustment
|
Recalibrate
|
|
Fuel flow rates are not even
|
1. Pump is worn out
2. Dirty pump filter
3. Vent line clogged
4. Loose fittings
5. Inlet orifice clogged
|
Replace
Clean
Clean out
Check all fittings for tightness
Clean
|
|
The
following troubleshoot is for the “Flow switch”.
|
|
Pump runs when toggle switch is in “On” position prior to using (Start position)
|
Circuit is closed (contacted)
|
Check switch for debris, clean and check for
open
circuit
|
|
Pump will not auto shut off when fuel flow is interrupted or when tip tank empties
|
1. Flow switch is stuck (contacted) closed circuit
2. Contact point are shorted
|
Check switch for
debris
Clean
|
|
Osborne
transfer pump P/N 55041
|
|
Description
|
Probable Cause
|
Correction
|
|
Pump
will not start (run)
|
Bad pump
Bad electrical ground to pump
No Power to pump
|
Replace
Check power circuit
Check ground
continuity
|
|
Pump by-passes fuel from Tip Tank to main tank when off
|
1. Bad anti-siphon seal in pump
2. Pump transfer switch was operated in the “start” position for extended amount of time
|
Replace pump and check
flow/pressure
switch for proper
operation (auto
shut off)
Replace pump and check flow/pressure
switch for proper operation (auto shut off)
|
|
Pump (is slow) has low fuel flow
|
1. Loose fitting connection
2. Clogged inlet orifice
3. Bad Pump
|
Check all fittings
Clean
Replace
|
|
Osborne fuel
gauge P/N 55027
Fuel gauge
(single) with selector switch.
|
|
Description
|
Probable Cause
|
Correction
|
|
Reads empty at all times with fuel in Tip Tanks
|
1. Fuel transmitter between Tip Tank and selector switch/gauge
is grounded
2. Faulty fuel transmitters
3. No power to gauge
|
Check fuel
transmitter wire for continuity, check
power
source
|
|
Reads full at all times with less than full Tip Tanks
|
Open fuel transmitter circuit.
|
Check fuel
transmitter wire for
continuity. Check for loose wire connection
|
