To Remove The Flywheel Housing; To Refit The Flywheel Housing - Perkins 4.108 Workshop Manual

FLYWHEEL AND FLYWHEEL HOUSING-P.2
P3
4. Check the alignment of the flywheel face by posi-
tioning the gauge as shown in Fig. P.1. Turn the
crankshaft and the total indicator reading for the
flywheel being truly at right angles to the crank-
shaft axis should not exceed 0.001 in (0,025 mm)
for every inch (25 mm) the gauge stylus is reading
from the centre of the flywheel, i.e. if the flywheel
has a diameter of approx. 20 in (500 mm) then the
stylus will be approx. 10 in (250 mm) from its
centre, therefore the total indicator reading should
not exceed 0.010 in (0,25 mm).
5. When the flywheel is correctly aligned, lock the
securing setscrews with the tabwashers.
To Remove the Flywheel Housing
1. Remove the flywheel (Refer to previous text).
2. Remove the starter motor.
3. Unscrew the securing setscrews and carefully tap
the housing clear of the locating dowels.
4. Carefully examine the housing for any signs of
cracks, fretting or other damage.
To Refit the Flywheel Housing
1. Ensure that the rear face of the cylinder block
and the mating face of the flywheel housing are
perfectly clean and free from burrs, etc.
2. Locate the flywheel nousing carefully on the two
dowels and refit the securing setscrews.
3. Mount a dial test indicator (clock) gauge with the
base on the crankshaft flange and the gauge stylus
on and perpendicular with the inner face of the
housing aperture as shown in Fig. P.2. Rotate the
crankshaft, the inner bore should be truly central
with the crankshaft within the limits listed towards
the end of this section.
4. With the gauge base still mounted in the same
position adjust the stylus so that it is at right
angles to the vertically machined rear face of the
flywheel housing as shown in Fig. P.3. Turn the
crankshaft and check that this face is at right
angles to the cranshaft axis to within the follow-
ing limits.
Check dowel location in block and housing, ream
and fit oversize dowels where necessary.
Diameter of Max.
Housing Bore Allowance
(total indicator
reading)
Up to 14{ in 0.006 in (0,15 mm)
(362 mm)
141 to 201 in
0.008 in (0,20 mm)
(362 to 511 mm)
201. ot 25! in 0.010 in (0,25 mm)
(511 to 648 mm)
25! to 31 in 0.012 in (0;30 mm)
(648 to 787 mm)
NOTE: Any adjustments which may be necessary
to bring the flywheel housing within the limits
quoted must be carried out on the housing, under
no circumstances may the rear face of the cylinder
block be interferred with.
5. When the housing is correctly aligned finally tighten
the securing setscrews.
6. Refit the flywheel as previously discribed on Page
P.i.