272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

Install Cylinder Heads
1. Install cylinder head with NEW gasket, Fig. 20.
Early Style
NOTE: Rocker shaft support (3) holes are offset.
Install with holes facing ends of rocker shaft,
Fig. 22.
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. 22.
Torque studs to 140 in. lbs. (16 Nm).
Fig. 20
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.
3. Torque bolts in the sequence shown, Fig. 20, to
165 in. lbs. (19 Nm).
NOTE: Models 540000, 610000 torque to 350 in.
lbs. (40 Nm).
Install Rocker Arms
Current Style
1. Lubricate rocker arm supports (2) with clean
engine oil.
2. Assemble rocker studs (1), rocker arm supports
and rocker arms (3) to cylinder head, Fig. 21.
Torque studs to 100 in. lbs. (11 Nm).
Install Push Rods
Fig. 22
NOTE: All models except 540000, 610000 –
Exhaust valve push rods are aluminum.
Models 540000, 610000 – All push rods are
aluminum.
1. Compress valve spring (3) with rocker arm (2)
and insert push rod (1) into rocker arm socket,
Fig. 23.
NOTE: Seat push rods into recess in tappets.
Fig. 23
Fig. 21
2. Repeat for No. 2 cylinder.
3. Adjust valve clearance. See Section 1.
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