Advertisement
(d) Check that the large end bolts are tight (see Technical Data)
(e) Check for undue wear in the small end bush by rocking the piston
whilst holding the connecting rod firmly
43. To remove connecting rod
(a) Remove cylinder head and cylinder.
(b) Drain the oil from the sump.
(c) Remove the sump
(d) Unscrew the large end bolts and withdraw the connecting rod and
piston assembly, being careful to note in which position the bearing
halves are fitted.
44. Connecting rod maintenance
(a) When fitting a small end bush take care that the oil hole coincides with
(hat in the connecting rod and that the bush enters the connecting rod
squarely In the absence of a press, a block of wood and mallet may be
used for driving it home
New small end bushes are supplied with a reaming allowance, and
(b)
after fitting must be reamed to the size shown under Technical Data.
(c) Large end bearings are of the precision thin wall steel back type and
consist of two half shells lined with bearing metal. They should be
replaced in their original positions
(d) New bearings are machined to give the required fit when in position
and should not be scraped or bedded in, neither should shims of any
description be fitted If the faces of the connecting rod or its cap are
filed the rod becomes useless regarding replacement bearing shells
When fitting make sure that the connecting rod bore, the outside of the
shells and their split faces are clear
(e) Connecting rods and caps are stamped with an assembly serial
number and care must be taken that numbers are correctly assembled
and on the same side
(f) Undersize bearings are obtainable from Petters Ltd or their agents.
45. To replace connecting rod
(a) Generally reverse the instructions for removal, making sure that the
connecting rod cap is away from the dipstick side of the engine.
(b) Tighten the large end bolts using a torque spanner set to the figure
shown under Technical Data
(c) Do not over-tighten the large end bolts or the bearing may distort. If a
torque spanner is not available, the bolts may be tightened using a
moderate force on a spanner gripped approximately 8in (200mm) from
the bolt
(d) When replacing the cylinder and cylinder head, check the bumping
clearance and valve rocker clearance.
46. 4:1hand starting (flywheel end)
(a) To remove
(i) Remove the starting gearwheel guard.
(ii) The gearwheels can now be greased using a high melting point
31
Advertisement
