Yanmar 4LHA-HTP Operation Manual page 504

Chapter 4 Intake and Exhaust System
6. Breather
6. Breather
6-1 Construction
The mist in the crank chamber goes past the tappets in the
cylinder block to the valve arm chamber, through the breather
hose on the bonnet (head) cover, and to the outside.
6-2 Breather inspection
(1) Check to see whether the breather pipe is clogged up, anc
clean if necessary. Replace the pipe if damaged oi
cracked.
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4LHA Serie