EH12, EH17, EH25 - Small Engine Discount
EH12, EH17, EH25 - Small Engine Discount
EH12, EH17, EH25 - Small Engine Discount
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4-3 CRANKSHAFT<br />
The crankshaft is forged carbon steel, and the<br />
crank pin is induction-hardened.<br />
0 The output end of the shaft has a crankshaft gear,<br />
and balancer gear for <strong>EH25</strong> which are pressed into<br />
position. (See Fig. 4-3.)<br />
I<br />
B TYPE<br />
1<br />
D TYPE<br />
Fig. 4-3<br />
4-4 CONNECTtNG ROD AND PISTON<br />
The connecting rod is forged aluminum alloy, and<br />
its large and small ends function as bearings. The<br />
piston is an aluminum alloy casting, and carries<br />
two compression rings and one oil ring.<br />
(See Fig. 4-4.)<br />
Fig. 4-4<br />
4-5 PISTON RINGS<br />
The Piston rings are made of special cast iron.<br />
The profile of the top ring is barrel face and the<br />
second ring has a tapered face with an under-cut.<br />
The oil ring consists of a cutter ring and a coil<br />
expander for better sealing and less oil consumption.<br />
--<br />
TOP RING<br />
SECOND RIN(<br />
OIL RING<br />
r<br />
-9-
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