Briggs & Stratton 083100, Manual

Page: 55 / 96

2. Lightly coat valve stems with lubricant, then insert
valves (Q) into cylinder head (G).
NOTE: Do Not get lubricant on valve face, valve seat, or
exposed end of valve stem.
3. Oil inside diameter of new stem seal/washer (P) and
install on intake valve stem. Slide seal/washer down
against cylinder head.
4. Support valve side of cylinder head on clean shop
towels. Place valve springs (O) and valve spring
retainers (N) over valve stems. Retainer with larger
counterbore must be used on exhaust valve. Using
thumbs, press against each retainer until it securely
locks into groove in valve stem.
Install Cylinder Head
1. Install a locating pin (Z) into each bottom mounting hole.
2. Coat threads of all cylinder head screws (F) with
lubricant.
3. Using a new head gasket (Y), install cylinder head (G)
on cylinder and start screws (F) by hand. Note: Install
each cylinder head screw into the same hole that it was
removed from. Step-torque screws in the sequence
shown until final torque value is achieved. Refer to the
illustration at the beginning of this section for the proper
sequence. Torque screws to value listed in
Section 14
- Engine Specifications.
NOTICE Do not fully torque each screw in one step as
it may result in a warped cylinder head. Step-torque all
screws to approximately 1/3 of final torque value, then to
2/3 final torque value, then finish at final torque value.
4. Install push rods (V) through guides (X) and into same
positions as removed. Ensure push rods are seated in
valve tappets as shown in the following illustration.
39
5. Install valve cap (M) onto end of exhaust valve stem
(Q).
6. Install rocker arms (T) onto rocker arm studs (U), then
install adjuster nuts (S) and jam nuts (R). Tighten nuts
until there is zero clearance between the valve stems
and rocker arms.
7. Rotate crankshaft at least twice to ensure proper
movement of the push rods and rocker arms.
8. Adjust valve clearance as instructed in Adjust Valve
Clearance found in Section 2.
9. Install rocker cover (J) with a new rocker cover gasket
(K). Torque screws (H) to value listed in
Section 14 -
Engine Specifications.
10. Install cylinder head shield (AB) using screws (AA) and
(AC). Torque screws to the value listed in Section 14
- Engine Specifications.
11. Install carburetor as instructed in Install Carburetor
found in section 4.
12. Install control bracket as instructed in Install Control
Bracket found in Section 5.
13. Install muffler (B) and new gasket (C). Torque nuts (A)
to the value listed in Section 14 - Engine
Specifications.
53
7