33
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14.14.3 Fully tighten the screw and read off the figure on the dial indicator. Convert from
millimetres to inches by dividing by 25.3, This is figure (A). Write the figure on the mechanism
housing for future reference.
14.14.4 Remove the assembly from the setting tool.
14.14.5 Figure (B), in thousandths of an inch, will be found written on the labyrinth. This may be
positive or negative figure, or zero.
14.14.6 Add figure (A) to figure (B). This gives the required thickness of the shim pack.
EXAMPLE: A = 0.020 in., B = -2(-0.002 in.). A-B = shim pack thickness = 0.018 in.
14.14.7 Using shims Part No. 3364-253 (0.05mm (0.002in.)), Part No. 3364-254 (0.08mm
(0.003in.)) and Part No. 3364-255 (0.25mm (0.010in.)), assemble a pack of shims of the required
thickness.
14.15 Position the mechanism housing (6) so that the pan axis spigot vertical.
14.16 Fit a suitable temporary pin (4 mm dia x 30 mm long) in the constant drag assembly to aid
alignment of spacer, shim and labyrinth.
14.17 Install the shim pack on the pan axis spigot and align the holes in the shims with the holes in the
spacer and the constant drag assembly.
14.18 Using a degreasing fluid which does not contain an oil-based corrosion inhibitor (See
“Consumable materials” on page 19), thoroughly clean the face of the constant drag assembly (12) and
the faces of the friction ring and six threaded holes in the labyrinth assembly (14).
14.19 Locate labyrinth assembly (14) on the pan axis spigot, ensuring that the groove in the outside
diameter is towards the constant drag assembly. Turn the labyrinth assembly to align the holes in the
centre part with the holes in shim pack and push it into position.
14.20 Remove the temporary pin.
14.21 Apply Loctite 222E to the threads of two screws (1) and pass them through the holes in the pan
axis nearer to the open side of mechanism housing (6) to secure labyrinth assembly (14). Do not
tighten screws (1) at this stage.
14.22 Lubricate dowel pin (5) and dowel pin (32) with white bearing grease.
14.23 Assemble pan drag actuator adaptor (36) to bell crank (2) using dowel pin (5).
14.24 Assemble bell crank (2) to bell crank trunnion (3) using dowel pin (32).
14.25 Position the bell crank assembly in recess in mechanism housing, feeding the pan drag actuator
adaptor (36) into the central hole.
14.26 Apply Loctite 222E to the threads of two screws (1) and pass them through the holes in the bell
crank trunnion and the pan axis spigot of the mechanism housing to secure labyrinth assembly (14),
ensuring that the bell crank trunnion is positioned firmly against the vertical face of the recess in the
mechanism housing. Do not fully tighten screws (1) at this stage.
14.27 Referring to Fig 6.2, temporarily install mechanism housing cover (30) and hold it in position with
screws (33).
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