Checking Free Length Of Valve Spring; Checking Tilt Of Valve Spring - Kubota D1803-CR-E4 Workshop Manual

SERVICING
7. Servicing
2. Adjust the seat width with a 0.52 rad (30°) or
0.26 rad (15°) valve seat cutter.
3. After you adjust the seat, check that the valve
seating is flat.
4. Apply a thin layer of compound between the valve
face and valve seat, and lap them with a valve
lapping tool.
5. Check the valve seating with Prussian Blue.
NOTE
• The valve seating surface must show good
contact on all sides.
Valve seat width Service specifi-
(1) cation
(1) Valve seat width
(2) Identical dimensions
(A) Check the contact
(B) Correct seat width
RELATED PAGE
7.6 Checking clearance between valve stem and
valve guide on page 4-165
7.4 Checking valve recessing on page 4-164
7.10 Checking free length of valve
spring
Tools required
• Vernier caliper
1. Measure the free length (1) of valve spring with a
vernier calipers.
NOTE
• If the measurement is less than the service
limit, replace it.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
2.12 mm
0.0835 in.
(C) Check the contact
(c) 0.52 rad (30°) or 0.26 rad
(15°)
Service specifi-
cation
Free length (1)
Service limit
(1) Free length
2. Check the full surface of the valve spring for
scratches.
NOTE
• If there is a damage, replace it.

7.11 Checking tilt of valve spring

Tools required
• Surface plate
• Square
1. Put the valve spring on a surface plate, and put a
square on the side of the valve spring.
4. ENGINE
41.7 to 42.2 mm
1.65 to 1.66 in.
41.2 mm
1.62 in.
4-167
KiSC issued 12, 2018 A