Makita EM4251 Service Manual Page 25

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5 - 3 Procedures for Reassembling
* Precautions for reassembling
1) Clean parts thoroughly before reassembling.
Pay most attention to keep clean the following parts.
- Piston
- Cylinder
- Crankshaft
- Connecting rod
- Bearings
2) Scrape off all carbon deposits from cylinder head, piston top, and piston ring grooves.
3) Check lip of oil seals. The oil seal with damaged lip has to be replaced. Apply oil to its lip before
assembling.
The direction of piston on connecting rod is
not specified.
Apply oil to the small end of connecting rod
before assembling piston and piston pin.
Use clips on the both side of the piston pin
to secure piston pin in position.
4) Replace all the gaskets with new ones.
5) Replace keys, pins, bolts, nuts, etc,. if necessary.
6) Torque bolts and nuts to specification referring to the "TORQUE SPECIFICATIONS".
7) Apply oil to rotating and sliding portions.
8) Check and adjust clearances and end plays where specified in this manual.
5 - 3 - 1 Cylinder Block, Valve Spring and Spring Retainer
Fig. 5-23
1. Insert valve
spring.
2. Slide spring
retainer.
Spring retainer
Valve spring.
Spring retainer
Valve spring
Spacer mounting
position
Intake valve
Exhaust valve
Spacer
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