Yamaha MM700A Manual page 119

ENGINE
other attached assemblies can be removed with the engine
in the frame, before the engine is removed.
The diecast, thin wall aluminum alloy crankcase (Fig-
ure 51) is precision machined in two halves and is easily
damaged. To avoid damage to the crankcase, do not ham-
mer or pry on any of the interior or exterior walls. The
crankcase halves are sold only as a matched set and if one
half of the crankcase is damaged, replace both. The crank-
case halves are bolted together and aligned with dowel
pins. The crankcase is assembled without a gasket, using a
light coat of RTV high temperature silicone sealant
Crankshaft service includes disassembling the crank-
shaft, replacing unsatisfactory parts and accurate crank-
shaft alignment. Special measuring and alignment tools, a
hydraulic press and experience are necessary to disassem-
ble, assemble and accurately align the crankshaft assem-
bly. Components of the crankshaft may be available as
individual parts; however, service should only be en-
trusted to a trained dealership or engine specialist. If it is
less expensive to disassemble the engine and taking the
crankshaft to the dealership for procedures that require
precision service.
The specifications and procedures that follow are pre-
sented to facilitate a complete, step-by-step major lower
end overhaul that can he followed when the engine is be-
ing completely reconditioned.
Crankcase Disassembly
This procedure describes disassembly of the crankcase
halves and removal of the crankshaft.
1. Remove the engine from the frame as described
chapter.
2. If so equipped, remove the electric starter as described
in Chapter Six.
3. Remove all engine mounts from the crankcase.
4. Remove the flywheel and stator coil assembly as de-
scribed in Chapter Six.
5. Remove the coolant pump as described in Chapter
Eight.
6. Remove the oil pump as described in this chapter.
7. Remove the cylinders and pistons, as described in this
chapter.
UTION
Do not damage the crankcase studs when
performing the following procedures.
8. Turn the crankcase assembly so it rests upside down.
Support the crankcase with wooden blocks so that the
connecting rods are not damaged.
9. Remove the oil hose (A, Figure 52).
NOTE
Different length bolts are used to secure the
crankcase halves. To ease assembly, draw
the outline of the lower crankcase halfon a
piece of cardboard, then punch holes in the
cardboard that represent each bolt position.
After removing the bolts from the crankcase,
insert them in their numbered position on
the cardboard.
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in this