Piston And Piston Rings; Inlet And Exhaust Valves - Kubota D1102-B Workshop Manual

and Piston Rings
Inlet and Exhaust Valve
(A)
(a)
(b)
(c) ------
(d)
- -«-! - - -
(e) --
( f )
(g)
0011 FOJ 9

1-3 PISTON AND PISTON RINGS

A piston of special el l i ptic shape is designed i n consideration
of explosion heat. Fu rther more, to enha nce piston's strength ,
a rib is prov ided between the piston a nd the piston boss.
Th ree piston ri ngs a re provided; two com pression ri ngs a nd
(d)
one oi l ri ng. Al l of them have d iff erent f u nct ions a nd sha pes.
¢>
Be ca ref u l w hen reassem bl i ng.
(a) Plated Keystone Ring
(b) Undercut Ring
(c) Coil Expander Ring
(d) Taper and Inside Cut Ring

1-4 INLET AND EXHAUST VALVES

Al I parts a re quenched a nd tempered to resist wear. For
enhanci ng the f ill i ng-u p of a ir i nto eng i ne, the i nl et va l ve
head is bigger the exha ust ( h) one. To prevent the ca rbon
ad hesion on exha ust va l ve stem, a "carbon-scra per"
prov ided at the l ower pa rt of ex ha ust val ve g u ide.
(a) Valve Cap
(b)
(c) Valve Spring Collet
(d)
(e) Valve Stem Seal
(f ) Valve Guide
(g) Inlet Valve
(h) Exhaust Valve
(i) Carbon Scraper
17
V1702-B Only
[ Engine Serial Number :
37196
Valve Spring Retainer
Valve Spring
I
,J
and beyond
is
( i )
KiSC issued 09, 2007 A