Briggs & Stratton 250000 Specifiche Pagina 294

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NOTE: SPECIFICATION TABLES BEGIN ON PAGE 24 OF THIS SECTION.
CHECK CRANKSHAFT
All Engines
Fig. 7 shows various crankshaft locations to be
checked. Table No. 1, Specifications, shows reject
sizes for those dimensions.
Inspect the gear teeth (1) for wear or damage.
Measure the PTO end journal (2), crankpin journal (3)
and magneto end journal (4).
Inspect the crankshaft plunger flat or keyway (5).
Discard the crankshaft if the flat or keyway are
damaged.
Inspect the threads (6) for wear or damage.
Undersize crankpin journals may be suitable for
re-grinding and re-fitting with undersize connecting
rod, see note below. Scrap the crankshaft if it is worn
beyond specification.
Check keyways for wear or deformation. Deburr
keyway edges to prevent scratching bearing and oil
seals.
CAUTION:
DO NOT straighten bent crankshafts.
NOTE:.020” (.51 mm) undersize connecting rods
may be obtained for use on reground
crankpin journals. See Table No. 2, Page
25 for grinding dimensions. Complete
instructions are included with undersize
rod. (See Illustrated Parts List to find
appropriate undersize connecting rod.)
Fig. 7
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4
5
6
1
2
Check Cam Gear – All Engines
Inspect gear teeth for wear and nicks. Cam gear
journals and lobe rejection sizes are shown in Table
No. 3, Specifications, Page 26.
Checking Compression Release
(Mechanical Yoke Type)
Mechanical yoke type compression releases use a
spring loaded yoke (2) at the exhaust cam lobe (1) to
open the exhaust valve during starting. When engine
starts, centrifugal force causes the yoke to overcome
spring tension and swings away from exhaust tappet
returning engine to normal compression, Fig. 8.
To Check:
To check, move yoke away from face of
cam gear and release. Yoke should return to
compression release position without binding or
sticking. Replace cam gear if yoke binds, yoke pivot pin
is worn, or return spring is broken.
Fig. 8
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