Checking Push Rod Alignment; Checking Oil Clearance Between Tappet And Tappet Guide Bore; Checking Timing Gear Backlash - Kubota D1803-CR-E4 Workshop Manual

SERVICING
7. Servicing
3. Calculate the oil clearance.
NOTE
• If the oil clearance is more than the service
limit, replace the rocker arm and measure
the oil clearance again.
• If the oil clearance stays more than the
service limit, replace the rocker arm shaft
also.
Service specifi-
Oil clearance be-
cation
tween rocker arm
and rocker arm
Service limit
shaft

7.14 Checking push rod alignment

Tools required
• V blocks
• Surface plate
• Dial gauge
1. Put the push rod on V blocks.
2. Measure the push rod alignment.
NOTE
• If the measurement is more than the service
limit, replace the push rod.
Push rod align-
Service limit
ment
7.15 Checking oil clearance between
tappet and tappet guide bore
Tools required
• External micrometer
• Cylinder gauge
1. Measure the tappet
micrometer.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
0.016 to 0.045 mm
0.00063 to 0.0017 in.
0.10 mm
0.0039 in.
0.25 mm
0.0098 in.
O.D. with an external
Service specifi-
Tappet O.D.
cation
2. Measure the tappet guide bore I.D. with a cylinder
gauge.
Tappet guide bore Service specifi-
I.D. cation
3. Calculate the oil clearance.
NOTE
• If the oil clearance is more than the service
limit or the tappet has a damage, replace the
tappet.
Service specifi-
Oil clearance be-
cation
tween tappet and
tappet guide bore
Service limit

7.16 Checking timing gear backlash

Tools required
• Dial gauge (Lever type)
1. Set a dial gauge (lever type) with its point on the
gear tooth.
4. ENGINE
23.959 to 23.980 mm
0.94327 to 0.94409 in.
24.000 to 24.021 mm
0.94489 to 0.94570 in.
0.020 to 0.062 mm
0.00079 to 0.0024 in.
0.07 mm
0.003 in.
4-169
KiSC issued 12, 2018 A