4-24 - POWERHEAD 90-817643R1 DECEMBER 1996
· Thoroughly clean(with solvent) and dry crankshaftand
crankshaft ball bearings. Recheck surfaces of crank-
shaft. Replace crankshaft if surfacescannot be proper-
ly “cleaned up”. If crankshaft will be reused, lubricate
surfaces of crankshaft with light oil to prevent rust. DO
NOT lubricate crankshaft ball bearings at this time.
DO NOT spin-dry crankshaft ball bearing with com-
pressed air.
Connecting Rods
If necessary, clean connecting rod surfaces as follows:
· Attach endcapstoconnectingrods. Following thesedi-
rections, tighten rod cap attaching bolts to specifica-
tions. Recheck alignment.
!
CAUTION
Crocus cloth MUST BE USED to clean bearing surface
at crankshaft end of connecting rod. DO NOT use any
other type of abrasive cloth.
· Cleancrankshaftendofconnectingrodbyusingcrocus
clothplacedinaslotted3/8in.(9.5mm)diametershaft,
as shown. Insert shaftinadrill press and operate press
at full speed while keeping connecting rod at a 90°
angle to slotted shaft.
IMPORTANT: Clean connecting rod just enough to
clean bearing surfaces. DO NOT continue to clean af-
ter marks are removed from bearing surfaces.
· Clean piston pin end of connecting rod, using same
method as above. Use 320 grit carborundum cloth in-
stead of crocus cloth.
· Thoroughly wash connecting rods to remove abrasive
grit. Recheck bearing surfaces of connecting rods. Re-
place any connecting rod that cannot be properly pol-
ished. Lubricate bearing surfaces of connecting rods
which will be reused with 2 cycle engine oil to prevent
rust.
PE-51083
Thermostat
Wash thermostat with clean water. Using a thermostat tes-
ter, similar to the one shown, test thermostat as follows:
· Open thermostat valve, then insert a thread between
valveandthermostatbody. Allow valve to closeagainst
thread.
· Suspend thermostat (from thread) and thermometerin-
sidetestersothatneithertouchesthecontainer.Bottom
ofthermometermustbeevenwithbottomofthermostat
to obtain correct thermostat opening.
· Fill thermostat tester with water to cover thermostat.
· 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 when tempera-
ture reaches 5° F (3°C) above designated stampingon
bottom of thermostat.
· Continue to heat water until thermostat is completely
open.
· Unplug tester unit.
· Replace thermostat, if it fails to open at the specified
temperature, or if it does not fully open.
PE-51087
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