Kubota D1803-CR-E4 - Checking Push Rod Alignment; Checking Oil Clearance between Tappet and Tappet Guide Bore; Checking Timing Gear Backlash

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.
Oil clearance be-
tween rocker arm
and rocker arm
shaft
Service specifi-
cation
0.016 to 0.045 mm
0.00063 to 0.0017 in.
Service limit
0.10 mm
0.0039 in.
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-
ment
Service limit
0.25 mm
0.0098 in.
7.15 Checking oil clearance between
tappet and tappet guide bore
Tools required
• External micrometer
•
Cylinder gauge
1. Measure the tappet O.D. with an external
micrometer.
Tappet O.D.
Service specifi-
cation
23.959 to 23.980 mm
0.94327 to 0.94409 in.
2. Measure the
tappet guide bore I.D. with a cylinder
gauge.
Tappet guide bore
I.D.
Service specifi-
cation
24.000 to 24.021 mm
0.94489 to 0.94570 in.
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.
Oil clearance be-
tween tappet and
tappet guide bore
Service specifi-
cation
0.020 to 0.062 mm
0.00079 to 0.0024 in.
Service limit
0.07 mm
0.003 in.
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.
SERVICING
7. Servicing 4. ENGINE
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
4-169
KiSC issued 12, 2018 A