Cylinder Head; Breather Hose Inspection - Yamaha EF1000 Service Manual

CYLINDER HEAD/
BREATHER HOSE INSPECTION
2-10
Compression test steps (below minimum
levels):
•Squirt a few drops of oil into cylinder.
•Measure compression again
Reading Diagnosis
Higher than without •Worn cylinder,
oil piston and piston
rings
Same as without oil •Defective piston,
ring(s), valve(s) and
cylinder head gasket
•Improper valve
timing and valve
clearance
Compression test steps (above maximum
levels):
• Check cylinder head, valve surfaces, or piston
crown for carbon deposits.
CYLINDER HEAD
1. Remove:
•Carbon deposits
Refer to the "CYLINDER HEAD INSPEC-
TION" section in CHAPTER 3.
BREATHER HOSE INSPECTION
1. Inspect:
•Crankcase breather hose
CD
Cracks/Damage-?Replace.
Loose connection---+Correct.