Temperature Switch Test; Reed Blocks - Mercury 75 Service Manual

Temperature Switch Test

190 F (88 C)
The 190 F (88 C) temperature switch is located in
outer side of cylinder head as shown.
a
3 Cylinder Models
a - Temperature Switch
During normal engine operating temperature, the
switch electrical circuit is open. The switch will close
when the temperature reaches 190 F
4 C). Reset of the switch to open circuit occurs at
170 F 8 F (77 C 4 C).
To test, place switch end into water with thermometer
and heat to 190 F 8 F (88 C
perform ohms test. Compare to specifications. If
switch does not fall within specifications, replace
switch.
4-46 - POWERHEAD
a
4 Cylinder Models
8 F (88 C
4 C). Take out and

Reed Blocks

NOTE: Do not disassemble reed block unless neces-
sary. It may be necessary to apply heat to bolt to soft-
R
en Loctite before removal.
a - Reed Block
b - Reed (3 Sets)
c - Retaining Washer
d - Tab Washer
e - Bolt
IMPORTANT: Do not "flop" (reverse) the reed for
additional use - replace reed when necessary.
BACKSIDE - REED BLOCK ASSEMBLED
There are 3 reed segments. Reed should lie flat.
There should be no preload (pressure between reed
and reed-block), but a slight preload is tolerable.
The maximum allowable opening between reed and
reed-block is 0.020 in. (0.51mm). This must be
checked with a flat blade feeler gauge, as shown.
90-830234R3 DECEMBER 1997
a
b
c
d
e
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