272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

Crankshaft end play is adjusted by adding or
removing a thrust washer. Thrust Washer Kit
#807625 contains shims with the following thickness;
0.039” (1.0 mm), 0.049” (1.25 mm) and 0.059” (1.5
mm). The thrust washer is installed on the PTO side
of the crankshaft next to the timing gear.
Install Cylinder Heads
1. Install cylinder head with new gasket, Fig. 10.
2. Assemble rocker studs (1), rocker arm supports
and rocker arms (3) to cylinder head, Fig. 11.
3. Torque studs to 100 in. lbs. (11 Nm).
NOTE: Engines manufactured before 940501xx
were equipped with sealing washers under
#1 and #3 cylinder head bolts.
2. Lubricate threads of head bolts with Valve Guide
Lubricant #93963.
Fig. 11
3. Torque bolts in sequence shown to 165 in. lbs.
(19 Nm).
NOTE: Models 540000, 610000 – 350 in. lbs.
(40 Nm)
4. Insert push rods into recess in tappets.
NOTE: All Models except 540000, 610000 –
Exhaust valve push rods are aluminum.
Models 540000, 610000 – All push rods are
aluminum.
Early Style
NOTE: Rocker shaft support (3) holes are offset.
Install with holes facing ends of rocker shaft,
Fig. 12.
1. Lubricate rocker arms (4) and shaft (2) with
clean engine oil.
2. Assemble rocker arms, shaft, supports and
studs (1) and install on cylinder head, Fig. 12.
3. Torque studs to 140 in. lbs. (16 Nm).
Fig. 10
Fig. 12
Install Rocker Arms
Current Style
1. Lubricate rocker arm supports (2) with clean
engine oil.
Install Push Rods
1. Compress valve spring (3) with rocker arm (2)
and insert push rod (1) into rocker arm socket,
Fig. 13.
NOTE: Be sure push rods remain seated in recess
in tappets.
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