SusiAir PILATUS PORTER PC6, Maintenance Program

Page: 214 / 248

Form No. ASI/MD-65 Revision 3 – July 2020 Page 3 of 7
NO. DESCRIPTION MECH. ENG.
4
CAUTION: DO NOT USE SHARP EDGE TOOLS TO BEND OR SET KEYWASHER TABS.
On completion of installation lock each key washer on respective nozzle assembly.
Do not exceed specified torque to align flat on tip with key washer.
5
Install the manifold adapters and fuel transfer tubes as follows.
NOTE: Primary fuel manifold adapters are identified by a single weld blob on the larger mounting
flange. Other weld blobs appearing on the knuckle section of the adapters should be ignored. (See
Fig 201)
a) Assemble Sheaths (Item 3) on all adapters (Items 2 & Item 5). Make sure each
locating pin engages hole in each sheath.
b) With Nozzle adapter and sheath pressed together by hand, check clearance
between adapter and sheath flanges. Maximum gap allowed is 0.003 inch (Ref.
Fig 203 upper drawing) Larger gap suggests either or both parts are distorted. If
found Send distorted parts to parts P &W for repair.
c) Carefully check gap between fuel nozzle tip and side hole in sheath; clearance
of 0.020 inch is required (Ref. Fig 203). If clearance is less at any point, either or
both parts are distorted. If found Send distorted parts to parts Pratt and Whitney
for repair.
d) Lubricate and install prefor med packings (13, Fig. 202) on all fuel transfer tubes
(1) using a thin layer of engine oil (PWC03-001). Position fuel transfer tubes into
ports on one side of manifold adapters (2 and 5). Full y insert fuel transfer tubes
in their respective ports until the bottom of manifold adapter is reached.
CAUTION: TO AVOID POSSIBLE OF THE STAINLESS STEEL GASKETS, IT IS
ADVISABLE TO SLIDE THE GASKET OVER THE SHEATH, CAREFULLY
ALIGN THE HOLES AND INSERT BOTH BOLTS, THE WHOLE ASSEMBLY
CAN THEN BE MATED WITH THE PADS ON THE GAS GENERATOR CASE
TUS AVOIDING ANY ATTEMPT TO LEVER THE GASKETS INTO ALIGNMENT
WITH THE BOLTS.
e) Position the Pre SB 1276/ Post SB 1276 gasket (Item 4) over the sheath (Item
3) on the inlet manifold adapter (Item 2) and align the bolt holes or mounting
studs. The sheath flange must be flat.
NOTE: The gasket may be put on either side. For consistency, all the gaskets
should be installed with the flat side against the gas generator.
NOTE: Post-SB1167 : For engines with the conversion coated gas generator
case only, lightly coat both faces of the gasket (4) with corrosion-
preventive compound (PWC09-003).
f) Position the gaskets (4) over the sheaths (3) on the primary and secondary
manifold adapters (5) and align on the bolt holes.
g) Start with each side of the inlet manifold adapter (2). Install the remaining
manifold adapters (5) and sheaths (3) on the gas generator case at the
locations specified before. Use the pusher (PWC32366) or puller (PWC54246)
to engage fuel transfer tubes (1) to interconnect with the adjacent adapter at
each location.
h) Install locking plate (Item 6) and bolts to the gas generator case. Torque bolts
finger tight.