Triumph TR2 Service Instructions Manual page 49

Fig. 17 Measuring Crankshaft End Float. This
operation can be carried out with a Dial
Test Indicator.
and although this may rarely happen,
oversize thrust washers t.005" may be
obtained by a special order on the
Spares Department under their normal
detail number specifying that the over-
size thrust washers are required.
5. CONNECTING ROD BEARINGS
(Fig.
8)
The connecting rod, a molybdenum man-
ganese steel stamping, is provided with a
phosphor bronze small end bush and the
precision type lead indium bronze steel
backed bearing at the big end. Like the
main bearings, no hand fitting is necessary
and in no circumstances should the bearing
caps be filed to tdke up wear.
Where excessive journal wear has occurred
the only satisfactory cure is to replace the
bearings ensuring first, however, that the
crankshaft journals and pins are in good
crder. Where a
inu.rna!
I
-
or
nir?
r
is wom,
ENGINE
18
Fig. 18 Reducing the thickness of a Thrust
Washer. This must only be carried out on
the Steel Side.
scored or tapered in excess of .002OV re-
grinding is necessary.
When a regrind is found to be necessary a
decision will have to be made as to the most
suitable undersize bearings which. will meet
the particular case. The reduced diameter
of the pin to suit the various undersize
bearings may be calculated by subtracting
-.0100", -.0200", -.0300" or -.0400"
from the original size as listed on page 1.
The small end bushes, dimensions given on
page 2, should be pressed into the rods and
subsequently reamed to 5"*.0005".
A
gudgeon pin selected to give a clearance of
.0002" at 68°F. This clearance will be in-
dicated by a light finger push fit, with the
piston warmed by immersion in hot water.
The connecting rod centres are 6.250"&
.002" and there is no offsetting of the rod in
relation to the bearing housings. The con-
necting rod cap is located in relation to the
rod bv means of dowel bush. as shown in
Fig.
6.
Before installing a connecting rod it should
be checked for alignment after first re-
moving the bearing shells. The rod should
be checked for bend, in which the piston
will not be perpendicular to the crankpin,
or if the gudgeon pin is not on the same
plane as the crank pin the rod is twisted,
see Fig. 19. Appropriate action should be
taken to deal with the various causes of
misalignment with a suitable bending bar.
The connecting rod aligning fixture shown
in Fig. 19 is obtained from . Messrs. .
V. L.
Chmcha and Company L~mrted,