Perkins L4 Workshop Manual - L-36 Fleet

faze U2
to tbe cranksbaft flange, adjust to set tbe needIe
of tbe indicator against tbe vertical machined
face on the flywhee1 housing. (See fig. U2).
Turn cranksbaft and check that this face is at right
angles to tbe cranksbaft axis. This facing must be
within tbe following limits (tota1 indicator reading)
ofbeing at truc right angles to tbe cranksbaft.
Diameter of Housing Bore Max. Allowance (T .I.R.)
Up to 141 in 0.006 in
(362 mm) (0,15 mm)
141 to 2Ot in 0.008 in
(362 to 511 mm) (0,20 mm)
2Ot to 25t in 0.010 in
(511 to 648 mm) (0,25 mm)
25t to 31 in 0.012 in
(648 to 787 mm) (0,30 mm)
AU adjustments to bring tbe flywbee1 bousing
within tbe limits specified must be on tbe flywhee1
housing and under NO CONOmONS must tbe
rear of tbe cylinder b1ock or adaptor plate be
interfered witb.
When tbe housing is aligned to tbe above limits
tighten the securing Guts evenly.
Ream tbe two dowe1 holes and fit the correct
length and size of dowe1s.
To Reit Flywheel.
The flywhee1 shou1d be rep1aced in the reverse
FlywheeJ and Flywheel Housing-continued
Fig. U4
order to wnen removing but the following must
also be carried out:
Sec that the flywhecl face and crankshaft flange
are perfectly clean and free from burrs before
fitting the flywheel.
When replacing the setscrews tighten evenly,
and for final tightening, a torque wrench should be
used, set to the tension recommended in Section B.
Checking Alignment of Flywheel.
When the flywheel bas been removed, it is
necessary to check the alignment on replacement.
Replace flywheel as mentioned above.
Secure the base of a dial indicator stand to
tbe flywheel housing.
Witb the flywheel at top centre set the needle of
tbe indicator on tbe flywheel periphery at T .D.C.
(see Fig. U.3).
Turn the crankshaft and check the clock. The
flywheel should run truc within .012 in. (.31 mm)
(total indicator reading).
With tbc base of thc indicator stand still bolted
to tbc flywheel housing, adjust to bring thc
indicator needIe against thc vertical machined face
of the flywheel. (See fig. U4.)
Again turn the crankshaft and check the clock.
The flywheel should be within 0.001 in. per inch
(0,02 mmo per 25 mm.) of radius from the centre
of flywheel to indicator needIe.
When tbe flywheel bas been checked fot thc
correct limits, lock thc setscrews with we.