,
Page L
1
Af ter regrinding, the sharp corners on the Dil
ways should be removed and the Crankshaft crack-
detected again and demagnetised.
NOTE ;-It is important that the RADII on the
main journals and Crankpins are maintained. If
these are neglected, a fatigue fracture is liable to
occur.
-..
CRANKSHAFr DATA
Description Dimensions
Main Joumal Diameter
STD. 2.99825/2..999 ins.
(76.16/76.17 mm)
-.010 in. 2.98825/2.989 ins.
(-.25 mm) (75.90/75.92 mm)
-.020 in. 2.97825/2.979 ins.
(-.51 mm) 75.65/75.67 mm)
-.030 in. 2.96825/2.969 ins.
(-.76 mm) 75.39/75.41 mm)
Mam Joumal Radü
Remarks
Surface finish
not to exceed
16 micro ins.
(.4 microns).
.,
-0
kin.
Must be
maintained.
t +.015 in.
(3.18/3.56 mIn)
Rear Main Joumal Width
STD. 2.0625/2.0635 ins.
(52.39/52.41 mm)
Not to exceed
2.0785" (52.79
mm) af ter re-
grind.
Crankpio Diameter
STD. 2.74825/2.749 iBs.
(69.81/69.82 mm)
-.010 in. 2.73825/2.739 ins.
(-.25 mIn) (69.55/69.57 mm)
-.020 in. 2.72825/2.729 ins.
(-.51 mIn) (69.30/69.32 mm)
-.030 in. 2.71825/2.719 ins.)
(-.76 mm) (69.04/69.06 mm)
Crankpin Radü
Surface finish
not to exceed
16 micro ins.
(.4 microns)
-0
-,.
0Jt in.,
This must be
maintained.
-,
CRANKSHAFT AND MAIN BEARINGS
Tbe crankshaft runs in three pre-finished replace-
able shell hearings, which are lead bronze lined
and indium flashed.
To Remove Crankshaft.
Remove cylinder head (See Section H)."
Remove sump (See Section P).
Remove lubricating oir pump (See Section P.)
Remove pistons and connecting rods (Sec
Section J).
Take off timing case front cover and remove
idler gear.
Remove timing case bottom cover.
Remove starter motor.
Remove flywheel and assembly.
Remove the cranks haft Teat end seal.
Remove main hearing caps and half hearings.
Lift out crankshaft.
Crankshaft Regrinding.
E~amination ror Wear.
Before proceeding to regrind the Crankshaft, the
following points should be checked to ensure it is
suitable fot further grinding.
Tbe Crankshaft should be crack-detected and
then demagnetised in order to remove any polar-
isation which may be present.
Tbe main joumal and crankpin diameters should
be checked fot ovality and measured to ascertain
the next appropriate size to which the Crankshaft
caD be reground, i.e. -.010" (-.25 mm), -.020"
(-.51 mm), -.030" (-.76 mm) from Standard. If
the crankshaft requires regrinding below -.030"
(-.76 mm), it is recommended that ncw crankshaft
he fitted.
It should be noted, however, that in the home
market, an exchange scheme is in operation where-
by reconditioned Crankshafts are available at a
certain cast, providing the Crankshaft being
exchanged is not damaged and is suitable for re-
grinding to a limit of -.030" (-.76 mm).
Regrinding.
All the necessary information required for re-
grinding the Crankshaft is given under ' Crankshaft
Data '. All limits listed thereunder must he
adhered to and the main joumals and Crankpin
must be free from grinding marks.
Not to exceed
1.80' (45.72
mm) af ter re-
grind.
l +.015 in.
(4.76/5.13 mm)
Crankpin Width
STD. 1.780/1.785ins.
(45.21/45.34 mm)
...,
(
-,
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