Disassembly and Assembly WM 80 Repair
122 wc_tx000523gb.fm
10.16 Cylinder and Piston Inspection
See Graphic: wc_gr002908
Ring Gap:
Remove the cylinder from the crankcase. Check the ring gap at the
lower part of the cylinder by placing the ring (h) in the cylinder and
measuring the gap between the ends of the ring. If the ring gap is
greater than 1.2 mm (0.047 in.) the rings need to be replaced. Ring
gaps should measure as follows:
New: 0.2 – 0.4 mm (0.008 – 0.016 in.)
Maximum: 1.0 – 1.2 mm (0.040 – 0.047 in.)
Piston Wear:
Piston wear is checked with a visual inspection. If the piston is
noticeably worn or scored, it should be replaced. Typically, a piston will
last through two sets of rings before requiring replacement.
Cylinder Wear:
Remove the cylinder from the crankcase. Carefully remove any carbon
deposits from the cylinder head, exhaust port, and piston head. Inspect
the piston and cylinder visually for scoring. Check the cylinder coating
for wear. If it has worn through, replace the cylinder.
NOTICE: Do not use a glaze breaker or hone on the cylinder. The
metal alloy coating of the cylinder will be destroyed and render the
cylinder useless.
Measure the cylinder wear by measuring the ring gap at the top of the
cylinder and again at the bottom. Use a new ring if possible and the
same ring for both measurements. If the difference in the two
measurements is greater than 0.2 mm (0.008 in.), the cylinder is worn
beyond its limits. Replace the cylinder, piston, and rings.
Typically, a cylinder will last through two pistons before requiring
replacement.
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