P 17/ 19
Repair
[4]DISASSEMBLY/ASSEMBLY
ASSEMBLING ENGINE BLOCK
Note: Be sure to apply Makita grease N No.2/
(1)Connect Piston with Crankshaft complete by inserting Piston pin into place; there is no front/back to Piston.
(2)Secure Piston pin by mounting Ring spring 12 onto each end of Piston pin.
Note: The ring gap of Ring spring 12 can be positioned at any angle to Piston pin.
(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. 63.
(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. 63.
Important 2: Second ring has a taper face and must be installed with the large diameter facing Oil ring. (Fig. 64)
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 red marking on the side face of Second ring as shown in Fig. 65 while not on the side face of Top ring.
•You can face the large diameter of Second ring by placing Second ring with the red marking on your right and with the ring gap near you as shown in Fig. 65.
If both of the two rings are used and the white 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.
(4) Remove oil/grease from the mating surface of Cylinder block and Crankcase.
Then apply ThreeBond 1215 to the mating surface of Crankcase as shown in Fig. 66. Note: ThreeBond 1215 must not be applied to Oil supply routes.
Apply
(6)Tighten eleven Hexalobular socket head bolts in a crisscross pattern. (Refer to Fig. 58.)
(7)Do not forget to set Exhaust port spacer in place on Muffler installation side of Cylinder head complete. (Fig. 67)
Fig. 63
| Oil ring |
| ring gap |
| ring gap |
| |
|
|
| |
Side rail |
|
| Top ring |
|
| Second ring | |
|
|
| |
Spacer |
|
| ring gap |
|
|
| |
Side rail |
|
| This mark can be |
ring gap |
|
| ignored for |
|
| assembling | |
|
|
| |
|
| ring gap | EK7650H/ EK7651H. |
|
|
| |
Fig. 64 |
| Fig. 65 |
|
Top ring, |
|
with barrel face | |
Second ring, |
|
with taper face | |
Side rail |
|
Spacer | Oil ring |
Side rail |
|
Fig. 66 [Crankcase viewed from top]
Second ring
red marking
Fig. 67
Portion to apply | Cylinder head complete |
| |
ThreeBond: |
|
indicated in gray | Exhaust port spacer |
Oil supply routes |
|
