Installing Thermostat Assembly; Installing Valve; Installing Tappet; Installing Cylinder Head - Kubota D1803-CR-E4 Workshop Manual

SERVICING
6. Assembling

6.25 Installing thermostat assembly

NOTE
• Replace the gasket with a new one.
1. Install the thermostat assembly (1).
NOTE
• Make sure that the direction the jiggle valve
oriented to the coolant temperature sensor.
(1) Thermostat assembly
2. Install the thermostat cover (2).
(2) Thermostat cover

6.26 Installing valve

NOTE
• Clean the valve stem and valve guide hole.
Tools required
• Valve spring compressor
1. Install the valve stem seal (1).
NOTE
• Apply the engine oil sufficiently.
2. Install the valve (2).
3. Set the valve spring (3) and valve spring retainer
(4).
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
4. Compress the valve spring with valve spring
compressor and install the valve spring collet (5).
(1) Valve stem seal
(2) Valve
(3) Valve spring
(4) Valve retainer
5. Remove the valve spring compressor.
6. After installing the valve spring collets (5), lightly tap
the stem tip to attach it correctly with the plastic
hammer.
7. Install the valve cap (6).

6.27 Installing tappet

IMPORTANT
• Do not change the combination of cylinder
number and tappet.
NOTE
• Apply engine oil thinly around tappets.
1. Install the tappets (1) to the crankcase (2).
(1) Tappet

6.28 Installing cylinder head

IMPORTANT
• When replacing the piston, piston pin bushing,
connecting rod or crankpin bearing, select the
4. ENGINE
(5) Valve spring collet
(6) Valve cap
(2) Crankcase
4-149
KiSC issued 12, 2018 A