Makita ER2650LH dimensions Repair DISASSEMBLY/ASSEMBLY 4-14. Engine block, Overlapped each other

Repair

P 13/ 14

[4]DISASSEMBLY/ASSEMBLY [4]-14. Engine block (cont.)

ASSEMBLING

(1)Assemble Piston to Rod of Crankshaft. (Fig. 33)

Fig. 33

1.Insert Piston pin through Piston and Rod of Crankshaft, and fix it with Clip by using an awl. Note: • Apply Makita grease N No.2 a little to Needle bearing in Rod of Crankshaft.

•Piston is bilateral symmetry and can be fixed in either direction.

•Clip gap can be located at any position.

2.Install all piston rings at designated position and direction as followings:

•Ring gaps of Piston ring (top) 34 and Piston ring (second) 34 are positioned at 180º angle points against each other.

•Ring gaps of two layers of Piston ring 34 (Oil ring) are positioned at 120º angle points against each point.

Note: Do not expand Piston rings too much as they are easy to break.

Two ring gaps are positioned at 180°

angle points against each other.

Two ring gaps are positioned at 120°

angle points against each other.

Piston top end

	Piston ring (top) 34
Top layer	Center-rised shape
	Piston ring (second) 34
Middle layer	Wide-based shape
	Piston ring 34 (Oil ring)
Bottom layer
	consists of three layers.
Cross section of Piston	Note: Ring gaps should not be
	overlapped each other.

Piston ring (top) 34

Piston ring (second) 34

Piston ring 34 (Oil ring)

Piston

(2)Assemble Cylinder block assembly by fastening it with screws in crisscross pattern. (Fig. 34)

Fig. 34

1.Degrease the matching surface of Cylinder block and Crank case, and apply ThreeBond 1215 on the Crank case side.

Note: The layer of ThreeBond 1215 has to be thin so as not to enter into the oil route in Engine and get clogged.

2.Apply 4-stroke oil to the contact surface of Piston and Cylinder. And then, install the assembled part of Piston into Cylinder block, while holding Piston rings.

3.Fasten Cylinder block assembly with screws in crisscross pattern.

The matching surface; indicated with black lines