Trouble Caused By Engine - Monoblock Engine Unit - Tecumseh SPECTRA 37 Service And Repair Manual

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SYMPTOM
5/1
Engine does not
start or starts with
great difficulty.
5/2
Same as item 1. In
addition, low power.
5/3
Engine has low
power.
5/4
Engine gives off oil
from breather pipe.
5/5
Engine consumes
too much oil.
5/6
Engine does not
start.
TROUBLE CAUSED BY ENGINE –
MONOBLOCK ENGINE UNIT
CAUSE
1) 1)
Excessive scaling The excessive scaling acts like a sponge, and
in the combustion at start-up it absorbs most of the fresh fuel at
chamber. input, thus causing starting difficulties.
Moreover, scaling can prevent valves from
closing perfectly.
2) 2)
Low compression. Lack of tightness in one or both valves due to
scaling, burning, workmanship defects.
Piston retaining rings usually wear out because
penetration of dust due to inadequate air filter
maintenance, or overheating due to engine not
being kept clean or to its improper use or to
insufficient oil level.
3) 3)
Loose head screw. Loss of compression from head with burning
of gasket; this problem is also accompanied
by the slight dripping of burnt oil from the head.
4) 4)
Pressure inside Engine oil level is too high, higher than MAX.
engine crankshaft Breather pipe jammed or defective. Excessively
high than average. worn out retaining rings.
5) 5)
Excessive wear Wearing of barrel-piston-rings for reasons
or incorrectly posi- listed in item 2.
tioned retaining Excessive clearance between stem and inlet
rings. valve guide, oil goes through and wears it out.
Retaining rings that were positioned at
assembling with openings all in a row (generally
facing downwards).
6) 6)
Breakage of cam- This problem is caused by violent shocks
shaft. Valves do not against the equipment tool.
Spark plug installation with long thread (in
move causing engine
to run by hand. general, bent or marked valve is noticed) or
usually, imprint on cylinder scaliing between
the two valves. Weakness or defect in spindle,
or excessive scaling in head, valves touch
against this causing breakage.
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DEFECT
104
CHAPTER 5
REMEDY
1)
Remove scaling.
2)
Restore valves by
sanding or milling
seats and replace
valves. Replace
rings or replace
miniblock.
3)
Replacement of
head and closure
gasket.
4)
Replace worn or
defective parts.
5)
Replace worn parts.
Restore valves.
Correct positioning
of rings (120° out-of-
phase).
6)
Replace spindle.