Kubota WG1605-G-E3 Workshop Manual page 119

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, WSM
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
Valve Recessing
1. Clean the cylinder head, the valve face and seat.
2. Insert the valve into the valve guide.
3. Measure the valve recessing with a depth gauge.
4. If the measurement exceeds the allowable limit, replace the
valve.
5. If it still exceeds the allowable limit after replacing the valve,
replace the cylinder head.
Factory specification
Valve recessing
(Intake and Exhaust)
Allowable limit
(1) Cylinder Head Surface
Valve Seating
1. Coat the valve face lightly with prussian blue and put the valve
on its seat to check the contact.
2. If the valve does not seat all the way around the valve seat or
the valve contact is less than 70 %, correct the valve seating as
follows.
3. If the valve contact does not comply with the reference value,
replace the valve or correct the contact of valve seating.
Valve seat width Factory specification
(1) Correct
(2) Incorrect
1-S41
ENGINE
(3) White Developer
9Y1210318ENS0088US0
0.050 (protrusion) to
0.25 (recessing) mm
0.0020 (protrusion) to
0.0098 (recessing) in.
0.40 (recessing) mm
0.016 (recessing) in.
(A) Recessing
(B) Protrusion
9Y1210661ENS0069US0
2.12 mm
0.0835 in.
(3) Incorrect
9Y1210318ENS0092US0
KiSC issued 01, 2012 A