POWERHEAD - 4-1990-826148R2 MARCH 1997
Check Valve
NOTE:Checkvalvecanbe replacedbyremoving in-
take manifold when powerhead is attached to drive-
shaft housing.
The check valve is a 3/16 in. (4.76 mm) diameter
brass casing containing a nylon ball-valve. It can be
damaged by hot combustionblow-by into crankcase
(ie.: backfire, or a hole in top of piston, etc.).
TO CHECK: Inspect check valve by looking through
hole. If light can be seen the nylon ball is bad (prob-
ablymelted); REPLACEvalve. Ifyou seeno light,in-
sert fine wire into check valve hole to see if there is
slight movement of nylon ball. If ball moves, valve is
O.K. Replace valve if ball does not move.
Installcheckvalveintocheck valveholderasshown.
Air
Air
51080
a
b
a - Check Valve
b - Check Valve Holder
Thermostat
Wash thermostat with clean water. Using a thermo-
stat tester, similar to the one shown, test thermostat
as follows:
· Open thermostat valve, then insert a thread be-
tween valve and thermostat body. Allow valve to
close against thread.
· Suspend thermostat (from thread) and thermom-
eter inside tester so that neither touches the con-
tainer. Bottom of thermometer must be even with
bottom of thermostat to obtain correctthermostat
opening.
· Fill thermostat tester with water to cover thermo-
stat.
· Plug tester into electrical outlet.
· Observe temperature at which thermostat begins
to open. Thermostat will drop off thread when it
starts to open. Thermostat must begin to open
whentemperaturereaches5°F(3°C)abovedes-
ignated stamping on bottom of thermostat.
· Continue to heat water until thermostat is com-
pletely open.
· Unplug tester unit.
· Replace thermostat, if it fails to open at the speci-
fied temperature, or if it does not fully open.
51087
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