2-4. ENGINE TROUBLESHOOTING (CONT)
TEST OR INSPECTION
9. EXCESSIVE OIL CONSUMPTION (Cont).
Remove cylinder head (page 3-45).
Check cylinder head gasket for damage.
a. If cylinder head gasket is damaged, replace gasket and reinstall
cylinder head (page 3-48).
b. If cylinder head gasket is okay, notify direct support mainte-
nance to check cylinder sleeves for out of round condition (page
4-9), glaze not correctly removed from cylinder sleeves (page
4-7), or piston rings not correctly installed (page 4-49).
Remove valve covers (page 3-60).
Check rocker arm compartment for signs of too much oil.
a. If compartment has signs of too much oil, problem is clogged oil
return holes. Use a thin wire probe and try to clear obstruction
from oil return hole.
b. If signs of too much oil are not seen, go to step 5 below.
Remove rocker arm assemblies (page 3-62).
Disassemble rocker arm assemblies (page 3-65).
Using bore gage and micrometer, measure inside diameter of rocker
Inside diameter should be not more than 0.8755 inch.
a. Replace a rocker arm if inside diameter is more than 0.8755
inch. Reassemble (page 3-69) and install rocker arm assembly and
valve covers (page 3-71).
Be sure you reassemble rocker arm assemblies correctly as described on
page 3-69. Failure to do so will cause high oil consumption.
b. If rocker arms are okay, go to step 6 below.
Using micrometer, measure outside diameter of rocker arm shafts.
Outside diameter should be 0.860 inch minimum.