2004 Buell Lightning: Engine
3-65
HOME
CLEANING AND INSPECTION
1
1
WARNING
1
WARNING
Low pressure compressed air can blow debris into your
face and eyes. Always wear eye protection or a face
shield when using pressurized air. Failure to take ade-
quate safety precautions could result in death or serious
injury.
1.
Soak cylinder and piston in an aluminum-compatible
cleaner/solvent until deposits are soft, then clean with a
brush. Blow off loosened carbon and dirt particles and
wash in solvent.
2.
Clean oil passage in cylinder with compressed air.
3.
Clean piston ring grooves with a piece of compression
ring ground to a chisel shape.
4.
Examine piston pin to see that it is not pitted or scored.
5.
Check piston pin bushing to see that it is not loose in
connecting rod, grooved, pitted or scored.
a. A piston pin properly fitted to upper connecting rod
bushing has a 0.00125-0.00175 in. (0.03175-
0.04445 mm) clearance in bushing.
b.
See Connecting Rod Bushing section. If piston pin-
to-bushing clearance exceeds 0.00200 in. (0.05080
mm), replace worn parts.
6.
Clean piston pin retaining ring grooves.
7.
Examine piston and cylinder for cracks, burnt spots,
grooves and gouges.
8.
Check connecting rod for up and down play in lower
bearings. When up and down play is detected, lower
bearing should be refitted. This requires removing and
disassembling engine crankcase.
Checking Gasket Surface
CAUTION
If cylinder gasket surface does not meet flatness specifi-
cations, replace cylinder and piston. Proper tolerances
will extend component life and prevent leaks.
1.
See
Figure 3-93.
Check cylinder head gasket surface for
flatness.
a.
Lay a straightedge across the surface.
b.
Try to insert a feeler gauge between the straight-
edge and the gasket surface.
c. If cylinder head gasket surface is not flat within
0.006 in. (0.152 mm), replace cylinder and piston.
2.
Check cylinder base gasket surface for flatness.
a.
Lay a straightedge across the surface.
b.
Try to insert a feeler gauge between the straight-
edge and the gasket surface.
c. If cylinder base gasket surface is not flat within
0.008 in. (0.203 mm), replace cylinder and piston.
Figure 3-93. Checking Gasket Surfaces
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