HLA (Hydraulic Lash Adjuster)
Remove the rocker arm (see Rocker Shaft and Rocker
Pull the HLA (Hydraulic Lash Adjuster) [A] out of the
rocker arm with fingers.
Be careful not to damage or deform an HLA by tap-
ping it during removal or installation.
Do not drop the HLA or hit it sharply. If it is dam-
aged, the plunger will not operate smoothly.
Check that the HLA plunger is not damaged.
If the plunger does damage, replace the HLA.
HLA Body [A]
Plunger Spring [C]
Pivot Plunger [D]
Check Valve [E]
Check Valve Spring [F]
Air-bleed the HLA (see HLA Air Bleeding).
Soak a rocker arm [A] in engine oil, and then insert the
HLA [B] into the rocker arm.
Be careful not to tip the rocker arm having the HLA, and
not to allow engine oil to leak out of the HLA.
HLA Air Bleeding
Fill a container with engine oil.
Prepare a thumbtack and cut its needle to 2.1 ∼ 2.3 mm
(0.0827 ∼ 0.0906 in.) long [A]. Grind its cutting edge [B]
Push in the check valve of the HLA [D] with the needle of
the tack [C] and move the plunger up and down in the oil
If the plunger sinks into the HLA body, repeat the air
bleeding procedure and then push the plunger.
After air bleeding, if the plunger sinks into the HLA body
again, replace the HLA.
Do not push the check valve in more than 2.1 ∼ 2.3
mm (0.0827 ∼ 0.0906 in.). Pushing too deep may
cause the damage of the HLA.
ENGINE TOP END 5-25