Assembling The Engine; Crankcase, Driving Side; Camshaft; Sump Filter - Triumph SPEED TWIN 1945 Workshop Instruction Manual

ASSEMBLING T H E ENGINE
Before commencing this operation, clean down the w o r k bench and lay o u t the
engine units and parts in assembly order. Also check the nuts, bolts and washers.
etc., and have the gaskets and jointing compound available. When the engine is
being erected, each working surface must be liberally oiled. This can be done with
the use o f a clean paint brush o r an o i l can. The operator should not rub on the
o i l with his fingers, otherwise a certain amount of grit, etc., may be picked up during
the process.
Crankcase, D r i v i n g Side. Lubricate the main bearing and the camshaft bushes.
Crankshaft Assembly. Enter the driving side shaft into the ball-race in the drive
side crankcase. Ensure that the shaft
i s
fully located. (it i s advantageous t o allow
the shaft t o protrude vertically through a convenient hole in the bench and then the
outer face of the drive side crankcase w i l l take the weight on the flat surface of
the bench).
Camshaft. As both camshafts are identical, the mechanical breather can be fitted
i n t o either.
First insert the spring and then the breather disc valve engaging the
projections into the camshaft slots. Enter this assembly into the inlet (rear of
engine) camshaft bush and test the engagement of the disc valve by depressing the
camshaft. Insert the other camshaft into the exhaust (front of engine) camshaft bush.
Crankcase T i m i n g Side.
Lubricate the main bearing and camshaft bushes.
Lightly smear jointing compound on the inner mating face, then thread this half
over the crankshafts and camshafts. Bolt the t w o halves together, ensuring that
these meet without undue force being applied. If any difficulty i s encountered,
suspect the breather disc in the inlet camshaft being o u t of position. To remedy,
rotate the camshaft until the slot i s engaged. T w o internal screws are located in
the crankcase just above the camshaft ; be sure t o replace these.
A l i g n i n g t h e Crankcase Halves. The top of the crankcase must present
a
perfectly
flat
face t o the cylinder base. There must be no step between the halves.
If a step i s evident, a sharp tap on the stud boss nearest t o the proud face, w i t h a
hide hammer, will bring
it
flush. Do not strike the base face itself. When the t w o
faces are properly mated, the bolts and screws should be fully tightened.
Rotate
the crankshaft t o check for freedom of movement.
S u m p Filter.
Fit the filter with a new joint washer t o the sump and over the
scavenge pipe, then the cover with a joint washer.
Replace the four washers and
nuts but do not over-tighten, otherwise a broken stud may result, a trouble which
can be well avoided
a t
this stage.
Crankcase.
Place the crankcase i n the vice as in the dismantling procedure
pour into
it
an egg-cupful of engine oil.