Briggs & Stratton 273521, 271172, 270962, CE8069, 276535 manual Assemble Cylinder Head

2.If head passes visual inspection, use Plug Gauge #19122 to check valve guides for wear. If gauge enters the guide 1/4” (6.4 mm) or more, replace the guide (models 97700, 99700) or replace the entire head (models 110000, 120000, 150000). If plug gauge is not available, see Section 12 - Engine Specifications for the valve guide reject dimension.

NOTE: To replace valve guides (models 97700, 99700), use Valve Guide Driver #19367 (A, Figure 10) to press out the guides. Then, using the same tool, press either end of the new guides into the head until 1/8” (3.2 mm) above flush (A, Figure 11).

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Figure 10

Figure 11

3.If guides are replaced, or the original guides still meet specifications, use Finish Reamer #19066 and Reamer Guide #19191 to ensure proper sizing and to clean out the guides. Thoroughly clean all reaming debris from cylinder head.

4.Inspect valves for wear or damage. Replace if necessary.

NOTE: Valve faces can be resurfaced on a commercially available valve grinder. However, Briggs & Stratton does not recommend this practice because the quality of the resurfacing may be insufficient. Instead, valve replacement is recommended.

5.Oil the intake valve guide and intake valve stem, then insert valve into head.

6.Using Valve Lapping Tool #19258 and Lapping Compound #94150, lap valve and seat together to assure a good sealing surface. Remove valve, the repeat procedure for the exhaust valve.

7.Thoroughly clean both valves and cylinder head of all lapping compound residue.

Assemble Cylinder Head

1.Install new plastic push rod guides into the cylinder head plate (A, Figure 12) (models 110000, 120000, 150000). Using new plate gasket, install the cylinder head plate. Torque screws to values listed in Section 12 - Engine Specifications.

Figure 12

2.Lightly coat valve stems with Valve Guide Lubricant #93963. then insert valves into cylinder head. Do not get lubricant on valve face, valve seat, or exposed end of valve stem.

3.Oil inside diameter of new stem seal/ washer and install on intake valve stem. Slide seal down against head plate or cylinder head (A, Figure 13).

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