3.15TOP END OVERHAUL: DISASSEMBLY
GENERAL
It is assumed that each step performed on one cylinder is
automatically repeated on the other.
To perform a complete top end overhaul, follow all steps listed
in this section including inspection and repair procedures.
BREATHER ASSEMBLY
TOOL NAMEPART NUMBER
LOWER ROCKER BOX WRENCHHD-47248
UPPER ROCKER BOX WRENCHHD-47258
NOTE
Dirt caked on cooling fins and other areas can fall into crank-
case bore or stick to subassemblies as parts are removed.
Abrasive particles can damage machined surfaces or plug oil
passageways. Remove all dirt and particles before disassembly
to prevent component damage.
1. Use low pressure spray to thoroughly clean exterior sur-
faces of engine prior to disassembly.
NOTES
• See Figure 3-17. If the engine is left in the chassis for
service, use the UPPER ROCKER BOX WRENCH (Part
No. HD-47258) and LOWER ROCKER BOX
WRENCH (Part No. HD-47248) to remove the rocker cover
and rocker housing bolts, respectively. These tools are
especially useful when removing the bolts on the left side
of the engine (particularly the rear) where there is close
proximity to the frame.With both an external and internal
hex, the bolts also can be removed with either a 7/16 inch
socket or open end/box wrench (open spaces), or a short
3/16 inch allen wrench (tight spaces).
• It is assumed that each step performed on one cylinder is
automatically repeated on the other.
2. See Figure 3-18. Following the sequence shown, altern-
ately loosen the six rocker cover bolts. Remove the rocker
cover bolts and their captive washers.
3. Remove the rocker cover and gasket. Discard gasket.
4. See Figure 3-20. Remove two bolts to release breather
assembly and filter element from the rocker arm support
plate. For inspection and repair information, see
3.19 BREATHER ASSEMBLY.
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