Briggs & Stratton 276535 AVS Balance System, Remove, Disassemble, Inspect, Assemble, Install

AVS® Balance System

Remove

1.Remove blower housing, flywheel, cylinder head, and sump. Discard gaskets.

2.Remove connecting rod and piston assembly.

3.Remove crankshaft and counterweight assembly.

Disassemble

1.Remove the crankshaft gear (F, Figure 30) from the crankshaft (A). If the gear is tight, pry it off using two screwdrivers, being careful not to damage the gear.

2.The woodruff key (E) can be removed, if required.

3.Remove and discard the plastic alignment plug (C) from the magneto side of the counterweight (D).

4.Slide the counterweight from the counterweight links (B).

5.Remove PTO link and magneto link from crankshaft.

Figure 30

Inspect

1.Visually inspect counterweight bearings for scoring or discoloration. If found, replace both counterweights as a set.

2.Measure the counterweight bearing diameters and compare to the values shown in Section 12 - Engine Specifications. If either bearing is worn beyond the reject dimensions, replace both counterweights as a set.

3.Measure the crankshaft eccentric diameters and compare to the values shown in Section 12 - Engine Specifications.

4.If crankshaft eccentrics are worn, scored, or discolored, replace the crankshaft.

Assemble

1.Lubricate all bearing surfaces with clean engine oil.

2.Slide the counterweight links on the crankshaft eccentrics.

NOTICE: Both links must be installed with the chamfered side facing the crankshaft crankpin.

3.Slide the counterweight into the counterweight links.

4.Press a new plastic alignment plug into the magneto side of the counterweight.

Install

1.Install the woodruff key to the crankshaft.

2.Install the timing gear to the crankshaft with timing mark out. The flange of the gear must face the counterweight link.

3.Place crankshaft and counterweight assembly into the cylinder and start magneto journal into magneto bearing.

4.Install connecting rod and piston.Torque rod screws to values listed in Section 12 - Engine Specifications.

NOTE: Lubrication hole in rod must face toward magneto side.

5.Using new gaskets, install sump, cylinder head, flywheel, and blower housing.

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