POWERHEAD
Page 4-24 90-826883R2 JUNE 1998
4. Check each cylinder bore for an out-of -round “egged shaped” cylinder. A maximum
of0.003in.(0.076mm)isallowable.Ifout-of-roundismorethan0.003in.(0.076mm),
cylinder block and crankcase cover must be replaced.
MERCOSIL BORE -- ALL MODELS S/N OG202750 AND ABOVE
1. Inspect cylinder bores for scoring, scuffing or a transfer of aluminum from piston to
cylinderwall. Scoring or scuffing,if NOTTOOSEVERE,cannormallybe removed by
honing. If a transfer of aluminum has occurred, a diluted muriatic acid such as “TIDY
BOWL CLEANER” should beapplied to the areas ofthe cylinderbore wheretransfer
of aluminum has occurred. After the acidic solution has removedthe transferred alu-
minum, thoroughly wash thecylinder bore(s) with hotwater anddetergent toremove
anyremaining acid.Cylinderwalls maynowbe honed to removeanyglazeand to aid
in the seating of new piston rings.
2. ThecylinderblockisMercosilandifnecessarycanbereboredto0.030in.(0.762mm)
oversized.
3. Check each cylinder bore for an out-of -round “egged shaped” cylinder. A maximum
of0.003in.(0.076mm)isallowable.Ifout-of-roundismorethan0.003in.(0.076mm),
cylinder block and crankcase cover must be replaced.
MEASURING CYLINDER BORE
1. Measureringtraveledareaofcylinderboreat3depths,(6places)bypositioningmea-
suring instrument in-line with and at right angle (90°) to piston pin centerline.
2. If cylinder bore is tapered, egg shaped or out-of-round by more than 0.003 in. (0.076
mm), replace cylinder block.
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