272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

5. Remove intake and exhaust valves.
Fig. 5
3. Remove head bolts (5, 6, 7, 8) and cylinder
head, Fig. 6. Discard cylinder head gasket.
NOTE: Engines manufactured before 940501xx
were equipped with sealing washers under
cylinder head bolts (5) and (6).
Repeat for other cylinder head.
Fig. 7
6. Remove and discard valve stem seals, Fig. 8.
Disassembly
Fig. 6
1. Thread rocker arm support screw into cylinder
head a few turns.
CAUTION
PREVENT EYE INJURY!
Inspect and Repair
Fig. 8
1. Check cylinder head, Fig. 9.
NOTE: Be sure all gasket material is removed from
surfaces before checking. Use a gasket
scraper if necessary.
a. Inspect cylinder head for cracks or damage.
b. Use a surface plate or straight edge (1) and
check cylinder head mounting surface for
distortion.
Replace the cylinder head if the mounting surfaces
are distorted more than 0.004” (0.1 mm).
• WEAR EYE protection when using
Valve Spring Compressor.
NOTE: Place a shop rag or short section of rubber
fuel line under valves inside combustion
chamber to hold valve in place while compressing
spring.
2. Compress valve spring and retainer with Valve
Spring Compressor (3) #19347, Fig. 7.
3. Remove valve spring retainer locks (2).
4. Gradually release pressure on the valve spring
compressor. Remove valve spring retainer and
valve spring.
Fig. 9
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