Servicing; Cylinder Head And Valves - Kubota EA330-E4 Series Workshop Manual

EA330-E4, WSM

[3] SERVICING

(1) Cylinder Head and Valves

Cylinder Head Surface Flatness
1. Clean the surface of the cylinder head.
2. Place a straight edge on each of the cylinder head's four sides
and two diagonal as shown at the right to check the straightness
of the surface.
3. Insert a feeler gauge between the straight edge and the cylinder
head surface.
4. The maximum thickness that can be inserted is the amount of
distortion.
NOTE
• Do not place the straight edge on the combustion chamber
(1).
5. If the measurement exceeds the allowable limit, correct it with a
surface grinder. Inspect the amount of the valve recession after
correction.
Cylinder head surface
Allowable limit
flatness
Finishing 8 μRmax
(1) Combustion Chamber
(2) Intake Valve
Cylinder Head Flaw
1. Prepare an air spray red check.
2. Clean the surface of the cylinder head with the detergent (2).
3. Spray the cylinder head surface with the red permeative liquid
(1). Leave it five to ten minutes after spraying.
4. Wash away the red permeative liquid on the cylinder head
surface with the detergent (2).
5. Spray the cylinder head surface with the white developer (3).
6. If flawed, it can be identified as red marks.
(1) Red Permeative Liquid
(2) Detergent
1-S44
ENGINE
0.05 mm / 100 mm
0.002 in. / 3.94 in.
of cylinder head surface
length
(3) Exhaust Valve
9Y1211018ENS0070US0
(3) White Developer
9Y1211018ENS0071US0
KiSC issued 05, 2015 A