Cylinder Head To Cylinder; Pivot Nut / Rocker Arm / Valve Clearance - BRP Johnson 4HP Service Manual

POWERHEAD
REASSEMBLY

Cylinder Head to Cylinder

1. Install the two dowel pins and the gasket to the cylinder
block.
2. Install the two push rods onto the end of the tappets in
the cylinder block.
NOTE:
Before installing the cylinder head, make sure that the piston
is at the TDC position on a compression stroke.
3. Install the cylinder head to the cylinder block.
4. Apply engine oil lightly to the cylinder head bolts.
5. Use an 8mm 12 point socket and tighten the bolts to
approximately 50 percent (%) of the specified torque
according to the numerical order in the figure.

Cylinder head bolt (approx. 50% torque):
1st step 14 N·m (1.4 kg-m; 10.0 lb-ft)
6. Loosen the all bolts to 0 N·m (0 kg-m, 0 lb-ft) according to
the reverse order. (2nd step)
7. Finally tighten the bolts to the specified torque in two
steps according to the numerical order in the figure.

Cylinder head bolt:
3rd step: 14 N·m (1.4 kg-m; 10.0 lb-ft)
Final step:
•
4 and 5 HP - 28 N·m (2.8 kg-m; 20.5 lb-ft),
•
6HP - 34 N·m (3.4 kg-m; 24.5 lb-ft)

Pivot Nut / Rocker Arm / Valve Clearance

1. Install the rocker arms, the pivot nuts and the valve
adjusting lock nuts onto the pivot bolts.
2. Adjust the valve clearance. (See the page 2-10)

Valve adjusting lock nut: 11 N·m (1.1 kg-m; 8.0 lb-ft)
6-38