Install Cylinder Heads; Install Breather - All Vertical Crankshaft Models & Horizontal Crankshaft; Models After Code 91080000 - Briggs & Stratton Twin Cylinder L-Head Repair Manual

INSTALL CYLINDER HEADS

Some models use three (3) longer head bolts located
around the exhaust valve area. If a short bolt is used in
the wrong position, it may not engage enough threads.
A long bolt in the wrong position may bottom on fins,
either breaking the fins or leaving the cylinder head
loose. Install long bolts around the exhaust valve area
of the cylinder head, torque sequence 1, 3, 7, Fig. 20.
1. Assemble cylinder heads with new head gasket
and cylinder head screws in correct location.
2. Apply Valve Guide Lubricant, #93963 to threads of
head bolts. DO NOT USE SEALER OF ANY KIND
ON GASKETS.
3. Torque head bolts in 40 in. lbs. (5.0 Nm) incre-
ments, in sequence shown, to 160 in. lbs.
(18.0 Nm).
4. Install cylinder head covers and cylinder shields.
a. Torque screws to 25 in. lbs. (3.0 Nm).
GENERAL ASSEMBLY
1. Assemble governor lever to governor shaft. DO
NOT tighten nut at this time.
2. Install governor control bracket, Fig. 22.
a. Torque screws to 35 in. lbs. (4.0 Nm).
Install Breather – All Vertical Crankshaft
Models & Horizontal Crankshaft Models
After Code 91080000
Install new breather gasket(s) with notches facing
crankshaft.
NOTE: On horizontal crankshaft models, install
new dipstick tube seal in cylinder before
installing air guide.
1. Install gasket between valve chamber and air
guide, #2 cylinder, then install cover.
2. Install breather and gasket #1 side, Fig. 23.
a. Torque screws to 25 in. lbs. (3.0 Nm).
3. Assemble breather tube to breather.
13
HEAD
GASKET
LONGER
#2
BOLTS
(EXHAUST)
1
5
3
7 8
6 4
40-2
OR 2 9
42-2
Fig. 21 – Head Nos. and Torque Sequence
GOVERNOR
CONTROL
BRACKET
Fig. 22 – Install Governor Lever And Control Bracket
BREATHER
TUBE
BREATHER
BREATHER
COVER
GASKETS
Fig. 23 – Install Breather And Air Guide
HEAD
GASKET
LONGER
#1
BOLTS
(EXHAUST)
1
5
3
7
8
6
4
40-1
9
2 OR
42-1
DIPSTICK
ASSEMBLY
AIR GUIDE
9