Check Piston Ring Groove Wear
1
1.
2.
Clean carbon from top ring groove.
Place a NEW ring in groove, Fig. 120 and measure space
between ring and ring land, Table No. 1, page 52.
1
2
Fig. 122 – Checking Rod Bearings
1.
Crankpin bearing
2. Piston pin bearing
Check Piston Pin and Piston Pin Bore
2
If piston pin is worn .0005” (.013mm) out of round or below
reject size shown in Table 4, it should be replaced.
Fig. 120 – Checking Ring Grooves
If piston pin bore, Fig. 123, is worn over reject size, replace
piston.
1.
Piston
2. New piston ring
Check Piston Ring End Gap
1
1.
2.
3.
Clean all carbon from the end of the rings, and from the
cylinder bore.
Insert old rings one at a time one inch down into the
cylinder.
Check end gap with feeler gauge, Fig. 121.
Fig. 123 – Checking Piston Pin Bore
1.
Piston pin bore
2
1
Assemble Piston and Connecting Rod
Note: Pistons on the GTS 200 engine have a shoulder stop on
one side of piston and use only one (1) piston pin lock.
The piston pin is a slip fit in both piston and connecting rod.
3
Note: All pistons are made with an offset piston pin bore.
1.
Piston must be installed with notch or arrow toward
flywheel side of cylinder.
Fig. 121 – Checking Ring End Gap
1.
2.
Ring
3. See Table 1
2.
Determine correct position of connecting rod relative to
notch or arrow on piston, Fig. 124.
Feeler gauge
4.
If ring gap is greater than shown in Table No. 2, page 52,
the ring should be rejected.
1
Check Connecting Rod
If the crankpin bearing is scored, the rod must be replaced.
Check condition of crankpin bearing surface on crankshaft.
Reject sizes of crankpin bearing hole and piston pin bearing
hole, Fig. 122, are shown in Table No. 3, page 52.
Fig. 124 – Assembling Piston and Rod
1.
Notch or arrow
Pistons, Rings, and Rods
50
GTS 200
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