POWERHEAD
90-884294 OCTOBER 2001 Page 4A-51
Cylinder Heads
1. Inspect internal surface of cylinder heads for possible damage (as a result of piston or
foreign material striking cylinder heads).
IMPORTANT: Cylinder head warpage should not exceed 0.005 in. (0.127 mm) over the
ENTIRE length of the cylinder head. If measured warpage, as determined on a surface
block, exceeds 0.005 in. (0.127 mm) or a discontinuity of up to 0.005 in. (0.127 mm)
exists in a 1.0 in. (25.4 mm) portion of the cylinder head’s surface length, then the cyl-
inder head must be replaced.
2. Replace cylinder head(s) as necessary.
3. Thoroughly clean gasket surfaces of exhaust divider plate.
4. Inspect exhaust divider plate for deep grooves, cracks or distortion that could cause
leakage. Replace parts as necessary.
Crankshaft
1. Inspect crankshaft to drive shaft splines for wear. Replace crankshaft if necessary.
2. Check crankshaft for straightness. Maximum runout is 0.002 in. (0.0508 mm). Replace
as necessary.
3. Inspect crankshaft oil seal surfaces. Sealing surfaces must not be grooved, pitted or
scratched. Replace as necessary.
4. Check all crankshaft bearing surfaces for rust, water marks, chatter marks, uneven wear
and/or overheating. (Refer to “Connecting Rods”.)
5. If necessary, clean crankshaft surfaces with crocus cloth.
52323
c
c
c
c
a
b
b
a-Crankshaft Journals
b-Crocus Cloth
c-Work Cloth “Back-and-Forth”
WARNING
DO NOT spin-dry crankshaft ball bearing with compressed air.
6. Thoroughly clean (with solvent) and dry crankshaft and crankshaft ball bearing. Re-
check surfaces of crankshaft. Replace crankshaft, if surfaces cannot be properly
“cleaned up.” If crankshaft will be re-used, lubricate surfaces of crankshaft with light oil
to prevent rust. DO NOT lubricate crankshaft ball bearing at this time.
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