P 18/ 22
Repair
[4]DISASSEMBLY/ASSEMBLY
[4]-13. Engine block (cont.)
ASSEMBLING
(1)Connect Piston with Crank shaft complete by inserting Piston pin into place; there is no front/back to Piston. Note: Be sure to apply a little amount of Makita grease N No.2 to Needle roller bearing.
(2)Secure Piston pin by mounting Clip onto each end of Piston pin. Any setting direction is allowed.
(3)Install Oil ring in the grooves of Piston; Side rail first, Spacer next, then the other Side rail.
Important: Be sure to fit the three rings with the ring gaps at 120 degrees to one another as shown in the left of Fig. 77.
(4)Install Second ring first then Top ring in the groove of Piston.
Important 1: Be sure to fit the two rings with the ring gaps at 180 degrees to each other as shown in the right of Fig. 77.
Important 2: Second ring has a taper face and must be installed with the large diameter facing Oil ring. (Fig. 78)
Distinguishing between Top ring and Second ring & Discriminating the larger diameter of Second ring: If both of the two rings are new and unused,
•You can distinguish from their appearances; there is a T marking on the right upper end of Second ring as shown in Fig. 75 while not on the upper end of Top ring.
•You can face the large diameter of Second ring by placing Second ring with the T marking on your right and with the ring gap near you as shown in Fig. 79.
If both of the two rings are used and the T marking of Second ring is rubbed off, carefully press the side face of the two rings to the inner wall surface of Cylinder. You will be able to distinguish the two rings or to discriminate the large diameter of Second ring through the differences in contact feelings that the different side faces make.
Fig. 77
| Oil ring | ring gap |
| ring gap | |
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| |
Side rail |
| Top ring |
| Second ring | |
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Spacer |
| ring gap |
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| |
Side rail |
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ring gap |
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| ring gap |
Fig. 78 |
| Fig. 79 |
Top ring, with barrel face | |
Second ring, with taper face | |
Side rail |
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Spacer | Oil ring |
Side rail |
|
Second ring | Note: Makita genuine second ring |
| has T marking on the right |
| upper end if it is not worn out. |
| Face the T marking toward |
| upward for assembly. |
| T |
| T marking |
(5)Apply
(6)Remove oil/grease from the mating surface of Cylinder block and Crank case.
Then apply ThreeBond 1215/ 1216 carefully to
the mating surface of Crank case as shown in Fig. 80. Note: Do not apply the adhesive to the area
designated by the enlarged view.
Apply
(7)Tighten eight M6x25 Hex socket head bolts in a crisscross pattern.
Fig. 80
Crank case viewed from the upper side
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Gray colored portions: |
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Do not apply the adhesive | ||||||||||||||||||||||||||||||||||||||||||
where the adhesive should | ||||||||||||||||||||||||||||||||||||||||||
be applied | to the designated area. | |||||||||||||||||||||||||||||||||||||||||