Crankshaft; Removal; Installation - Triumph Thunderbird Service Manual

Crankshaft
Removal
1. Remove the engine from the frame (see page 9-2).
2. Separate the lower and upper crankcases (see page
5-4).
3. Remove the balancer shafts (see page 6-3).
4. Remove the connecting rod big end caps (see
page 5-10). Discard the bolts after removal.
5. Lift the crankshaft from the upper crankcase.
Support the connecting rods during crankshaft
removal to prevent damage to the rods, liners and
upper crankcase.
Installation
Always check the main bearing journal clearance (see
page 5-13), before final assembly of the crankshaft.
Failure to correctly select crankshaft bearings will result
in severe engine damage.
1.
Select and fit new main and big end bearing shells
using the selection processes detailed on pages 5-12
and 5-13.
2. Lubricate all bearings with engine oil.
3. Ensure that the crankshaft is clean, and that the oil
ways within the crankshaft are clean and free from
blockages and debris.
The crankshaft to idler gear timing will be lost when the
crankshaft is removed. Do not refit the crankshaft
without first setting the crankshaft to idler gear timing.
Incorrect idler gear timing will result in incorrect
camshaft timing. Rotating or attempting to start an
-engine with incorrectly adjusted camshaft timing will
result in severe engine damage.
4. Install the crankshaft to the upper crankcase,
ensuring the crankshaft drive gear is correctly timed
to the idler gear as follows:
Check that the timing pin T3880039 is fully
installed in the idler gear, ensuring the pin
passes through both the idler gear and the
backlash gear and into the crankcase web (see
page 3-13>.
@
--:l
1. Tool T3880039
2. TIming hole in crankcase
Carefully lower the crankshaft in to the
crankcase, ensuring that the crankpins align
with the corresponding big ends and that the
two timing marks on the balancer drive gear
line up with the crankcase split line, as shown
below. Make sure that two balancer shaft
timing marks are visible as shown below.
5. Align the connecting rod big ends to the crankpins.
6. Fit the big end caps and tighten them (see page 5-10
for the tightening sequence and torque).
Z Install the balancer shafts (see page 6-4).
8. Assemble the crankcases (see page 5-6).
SelVice Manual - Thunderbird
5.9