Triumph TR6 PI Operation Manual page 76

ENGINE
CYUNDER BLOCK
1. Strip the engine 12.41. 05.
2. Measure the cylinder bores for taper, ovality and
maximum wear.
3.
Rebore and hone to dimensions in data.
NOTE: Maximum rebore oversize from standard is +0·020
in. Cylinders that cannot be satisfactorily rebored
within this limit may be sleeved to restore them to
the original size as follows:
a.
Bore out the cylinders to 3·059 to 3·062 in
(77·699 - 77·775 mm).
b. Remove sharp edges from top of cylinders.
c. Lightly oil the outside diameter of the sleeve -
DO NOT GREASE.
d. Insert the sleeve into the cylinder so that the
cut-a-ways in the sleeve line up with the
corresponding slots in the bottom of the
cylinder bore.
e. Press the sleeve into the bore squarely with a
minimum pressure of
2
ton f. until it is flush
with the top of the cylinder block.
NOTE: Whilst the sleeve is flush with the top face of
the cylinder block the sleeve will never-the-Iess
be proud of the recess surrounding each bore.
Therefore it will be necessary to machine the
top of the sleeve down flush with the bottom
of the recess. This note relates to later engines_
/. True-up the cut-aways with a me so that no
overlap of the cylinder block slots remain.
g_ Bore and hone the sleeve bores to size - see
data_
4_ Rebuild the engine 12.41.05 fitting:
a.
new oversize pistons to rebored dimensions or
b. standard graded pistons to sleeved bores
- Rebore 12.25.23
NT2850
DATA
Standard bore size - Grade A
Standard bore size - Grade B
Maximum rebore size -
Diameter of sleeve -
Bore-out cylinder to accept sleeve
Minimum sleeve fitting pressure
Length of sleeve
12.25.23
2·9405 - 2·9410 in (74·689 - 74-701 mm)
2"9411 - 2·9416 in (74-704 -74-717 rom)
+0·020 in (+0·508
rom)
3·066 - 3-067 in (77·876 - 77-901 mm)
3·059 - 3·062 in (77-698 - 77·774
rom)
2 ton f.
5·770 in (136·558 mm)
Triumph TR6 Manual_ Part No. 545277 Issue 1