The early 3T models have long studs fitted to the crankcase, the cylinr'er block and
head being held down by eight bolgs screwing into these studs.
DISMANTLING
THE
3T
ENGINE
(I
Disconnect exhaust pipes, carburetter, engine steady bracket,
H.T.
cables,
and remove plugs.
(2)
Take off the rocker gear feed pipe by removing the two banjo unions at the
rocker spindles.
(3)
To remove the cylinder head, unscrew the eight holding down bolts.
Lift
the cylinder head vertically and detach the push rods and cover rubes, when
the head can be lifted clear of the cylinder block.
(4)
To remove the valves from the cylinder head, a valve spring compressor
tool is required. When the valve springs are in a compressed state the
valve spring cotters can easily be detached with the use of a screwdriver,,
Carefully mark the valve to aid replacement.
(5)
If the rocker arms are quite free on their spindles,
it
is undesirable to strip
the rocker gear. Should
it
be necessary, the spindles can be tapped out
from the threaded end, using a soft tool, and the rocker arms extended
from the rocker box.
(6)
To remove the cylinder block on early models,
it
is only necessary to raise
it
clear
of
the crankcase studs.
On later models, first remove the holding
down nuts. Before lifting the cylinder block, care should be taken to prevent
the tappets falling into the crankcase.
This can be overcome by placing a
short
?"
bolt between the tappet grooves.
(7)
Pistons can be taken off by removing two circlips and tapping out gudgeon
pins clear of the connecting rod with a soft drift. Care must be taken to
support the opposite side of the piston adequately whilst carrying out this
operation. Suitably mark the pistons so that correct re-assembly may be
assured.
I
I
ASSEMBLING
THE
3T
ENGINE
(1)
Replace pistons--ensure correct positioning of circlips and rhe gaps in the
piston rings are not in line.
(2)
Prepare cylinder block-grease base washer and
fit
to block. Fit the four
tappets and secure them against falling into the crankcase. The block rnusr
be installed with the "DS" mark, which will be found on the base flange, to
the drive side of the engine.
To Next Page
Loading...
Need help?
General
