Briggs & Stratton 276535, 271172, 270962, CE8069, 273521 manual Install Piston and Connecting Rod

NOTE: For Vertical Model 120000 ONLY, install piston with notch or arrow (A, Figure 8) facing away from “MAG” on the rod. When installed in engine, the notch will face the PTO.

Figure 8

3.Install a pin retainer into groove on open side of piston pin bore. Ensure retainers are firmly seated in grooves.

4.Using Piston Ring Expander #19340, install oil ring and spring expander, then the center ring, then the top ring. Follow the orientation noted at time of disassembly, or use the instructions provided if installing a new ring set.

NOTE: If oil ring consists of two steel rails and a spring expander, they must be installed by hand as follows:

•Grasp one end of lower steel rail and wind it over the top ring groove, then into the center ring groove, and finally into the oil ring groove.

•Install the spring expander on top of the lower rail, then install the upper steel rail.

Install Piston and Connecting Rod

1. Thoroughly clean and oil cylinder bore and

	crankpin journal.
11
	2. Rotate crankshaft until crankpin journal is
	at bottom of stroke.

3. Using Ring Compressor Tool #19070 or #19230, install piston with notch or arrow (A, Figure 9) toward flywheel side of engine, taking care not to damage crankpin journal or connecting rod bearing.

Figure 9

4.Fit connecting rod bearing on crankpin journal, then install rod cap with match marks aligned.

5.Cap should snap into position when assembled correctly. Install rod screws (and dipper, if equipped).

6.Tighten screw closest to piston (A, Figure

10)first, then screw farthest from piston

(B) second. Torque screws to values listed in Section 12 - Engine Specifications.

Figure 10

NOTE: Failure to use a torque wrench can result in loose rods causing breakage, or over- tightened rods causing scoring.

7.Rotate crankshaft two revolutions to ensure crankpin and rod do not bind.

8.Move connecting rod sideways to ensure rod has clearance on crankpin side.

150