152
POWERHEAD
CRANKSHAFT, PISTONS AND CAMSHAFT
Cylinder
Use a straightedge and a thickness gauge to
measure the cylinder distortion on the gasket sur-
face at six locations as shown.
The service limit for distortion is 0.001 in. (0.03
mm). If measurement exceeds service limit, resur-
face or replace cylinder.
The cylinder can be resurfaced using a surface
plate and #400 grit wet sandpaper. Move the cylin-
der in a figure eight pattern when sanding.
Check water jackets for clogs or obstructions.
Measure the cylinder bore in the thrust and axial
directions at two depth positions 1 and 2.
The difference between the two depth measure-
ments is the cylinder bore taper.
The difference between the axial and transverse
measurements is the cylinder bore out-of-round.
The service limit for cylinder bore wear is 0.0039
in. (0.10 mm). If either taper or out-of-round mea-
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