Checking Valve Recessing; Adjusting Valve Lapping - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE
5. Apply the white developer (3) on the cylinder head
surface.
NOTE
• If you found a red flaw, replace the cylinder
head.
(1) Red permeative liquid
(2) Detergent

7.4 Checking valve recessing

Tools required
• Depth gauge
1. Clean the cylinder head surface (1), valve face and
valve seat.
2. Set the valve into the valve guide.
3. Measure the valve recessing with a depth gauge.
NOTE
• If the measurement is more than the service
limit, replace the valve.
• If it stays more than the service limit after
you replace the valve, replace the cylinder
head.
Service specifi-
cation
Valve recessing
Service limit
4-164
(3) White developer
0.65 to 0.85 mm
0.026 to 0.033 in.
1.20 mm
0.0472 in.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
(1) Cylinder head surface
(A) Recessing

7.5 Adjusting valve lapping

Tools required
• Compound
• Valve lapping tool
• Prussian Blue
1. Apply the compound equally to the valve lapping
surface.
2. Put the valve into the valve guide. Lap the valve on
its seat with a valve lapping tool.
3. After you lap the valve, clean away the compound
and apply oil, then lap the valve again with oil.
SERVICING
7. Servicing
(B) Protrusion
KiSC issued 12, 2018 A