Checking Cylinder Head Surface Flatness; Checking Cylinder Head Flaw - Kubota D1803-CR-E4 Workshop Manual

SERVICING
7. Servicing
5. Remove the cylinder head and compare the width
of the crushed plastigauges (2) with the scale (3).
NOTE
• Top clearance = Width of the crushed
plastigauge (2)
• If they are out of service specification, check
the oil clearance of the crankpin, journal and
piston pins.
Service specifi-
Top clearance
cation
(2) Crushed plastigauge
7.2 Checking cylinder head surface
flatness
Tools required
• Straightedge
• Feeler gauge
1. Clean the cylinder head surface.
2. Place a straightedge on the cylinder head's four
sides (A), (B), (C) and (D) and two diagonal (E) and
(F) as shown in the figure.
3. Measure the clearance with a feeler gauge.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
0.60 to 0.70 mm
0.024 to 0.027 in.
(3) Scale
NOTE
• If the measurement is more than the service
limit, make it straight with a surface grinder.
IMPORTANT
• Check the valve recessing after you correct.
Cylinder head sur-
Service limit
face flatness

7.3 Checking cylinder head flaw

Tools required
• Red permeative liquid
• Detergent
• White developer
1. Clean the surface of the cylinder head with
detergent (2).
2. Apply some red permeative liquid (1) on the
cylinder head surface.
3. After you apply, do not touch it for 5 to 10 minutes.
4. Clean away the red permeative liquid on the
cylinder head surface with detergent (2).
4. ENGINE
0.05 mm
0.002 in.
4-163
KiSC issued 12, 2018 A