Lycoming TEO-540-C1A Maintenance Manual page 208

B. Backlash Check:
NOTICE: Refer to Section IV in the latest revision of the
Service Table of Limits - SSP-1776 for low limit
and high limit propeller governor idler gear
backlash.
(1) To complete a check of the low limit backlash, insert a
0.008 inch shim between the spacer and crankcase
(Figure 77).
(2) Turn the propeller governor idler gear 90°. Record
backlash. Remove and insert the shim at 90 intervals.
Record the reading of each backlash check.
(3) During assembly, to complete a check of the high limit
backlash, try to insert a 0.021 shim between the spacer
and crankcase. For correct backlash, the shim must not be
insertable.
C. Propeller Governor Set Screw
NOTICE: To ensure that there is adequate material in the set
screw hole to peen on top of the screw, use a new
set screw that is shorter than the one previously
removed. A smaller diameter center punch could be
necessary. Refer to Figure 79.
(1) Wear impermeable gloves and apply a light coat of
®
Loctite 290
away any excess Loctite
cloth.
(2) Install the set screw into the crankcase (Figure 78). Align the idler gear shaft with the set
screw to enable the set screw to lock into the indentation in the idler gear shaft to hold the
idler gear shaft in place.
(3) Torque the set screw 32 to 38 in.-lb. (3.6 to 4.3 Nm).
(4) Use a smaller center punch (peening
tool) with a 3/32-inch (2.38 mm)
diameter at an approximate 50°/60°
angle to peen the threads of the hole
at the top of the taper above the set
screw to prevent the set screw (as
shown in Figure 79) from backing
out.
72-20
Page 178
™
or equivalent to the new set screw. Wipe
™
®
290 with a clean lint-free
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Shim Between Spacer and
Crankcase – Backlash Check
Figure 79
Center Punch (Peening Tool) for Set Screw
© 2018 Avco Corporation. All Rights Reserved
Figure 77
Figure 78
Set Screw Location
November 2018