Piston: Service and Repair

ASSEMBLY OF PISTON AND CONNECTING ROD ASSEMBLIES
1. ASSEMBLE PISTON AND CONNECTING ROD

(4A-F, 4A-FE)
(a) Coat the piston pin with engine oil.

(b) Align the front marks of the piston and connecting rod.

(d) Check that the piston moves smoothly back and forth on the piston pin.

(4A-GE)

(a) Install a new snap ring one side of the piston pin hole.

(b) Gradually heat piston pin to 70 - 80°C (158 - 176°F)

(e) Push in the piston pin with your thumb.
(f) Install a new snap ring on the other side of the piston pin hole.

(g) Check that the piston moves smoothly back and forth on the piston pin.

2. INSTALL PISTON RINGS

(a) Install the oil ring expander and two side rails by hand.

(b) Using a piston ring expander, install the two compression rings with the code mark facing upward.

(c) Position the piston rings so that the ring ends are as shown.

CAUTION: Do not align the end gaps.

3. INSTALL BEARINGS

(a) Install the bearing in the connecting rod and rod cap.
(b) Lubricate the face of the bearings with clean engine oil.

NOTE: If replacing the bearings, replace with one having the same number as marked on the bearing cap.

CAUTION: Install the bearing with the oil hole in the connecting rod.