Preparation For Engine Repair; Preparation For Engine Repair; Cylinder And Cylinder Block Overhaul - Toro Workman 3000 Series Service Manual

Preparation for Engine Repair

1. Before cleaning and disassembly, carefully check for
problems that cannot be found after the engine has
been cleaned or disassembled (e.g. oil leaks from
cracked components, gaskets or loose fittings,
damaged air cleaner or breather hoses that could cause
cylinder wear, etc.). Make a note of any problems that
you find.
2. Clean or wash the engine exterior thoroughly before
disassembly.
IMPORTANT: To prevent possible damage to en­
gine, do not spray water on a hot engine.
3. Do not disassemble or remove parts that do not
require disassembly.

Cylinder and Cylinder Block Overhaul

Before removing any parts, disassembly or overhaul of
the Mitsubishi engine, it is very important to understand
the nature and probable cause of the problem that made
an overhaul necessary.
When the engine trouble is caused by worn cylinders,
rings or valves, one or more of the following symptoms
will occur:
1. Low engine power, and a decrease in compression
pressure.
2. Increased fuel consumption.
3. Increased lubricating oil consumption.
4. Poor engine starting.
5. Loud noises in the engine.
Liquid Cooled Gas Engine
4. Disassemble the engine in proper order, arranging
the parts the disassembled parts neatly. Apply clean
engine oil to disassembled parts, as necessary to
prevent rust.
5. Keep the work area clean; dirt causes engine failures.
6. Be very careful when working on fuel system
components. Cover the work area with clean paper.
Engine Compression
The time interval to overhaul the engine can most
accurately be determined by regular and systematic
cylinder compression
Compression Test in the Testing section of this chapter.)
It is important to find the cause of the engine failure
before beginning repair. Poor starting may be a result of
electrical problems. Noises may be associated with a
mechanical part outside the engine. Excess fuel or oil
consumption may be the result of leaks. (See the
Troubleshooting section of this chapter.)
Another indicator of the need for an overhaul is oil
consumption. Make sure the engine does not leak oil.
when the oil consumption between the oil change
maintenance interval is approximately 1–1/2 times
normal (150%), engine overhaul should be considered.
With a good knowledge of how the engine operates,
access to maintenance and compression test records,
and information in the Troubleshooting section of this
chapter, unnecessary disassembly and inspection can
be eliminated.
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measurement. (See
Workman 3000/4000 Series