Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 65Get this manual
PISTON CLEARANCE Min im um Bore easurementMaxim um Piston easurementPisto Cleara nce Piston Clearance .0012 In-0.0024 In(O.03mmO.06mmIMPORTANT: If necessary, replace piston andl or cylinder block so that piston clearance is ithin specifica-
RING SIDE CLEARANCE 1With new rings installed iston, measure clea rance between installed pisto ring and ring lan d
Piston Rings
RING END GAP
, Measure eac new pi ston ring one at timePush ring ap prox im at ely 1 2" (13mminto cylinde bore, using skirt of piston to position fing at right angle (90 deg rees) to bo rePiston Ring Side Clearance
Top 0.0012 In- 0.0028 In(0.03mm.07m2nd 0.0008 In- 0.024 In (0.02mm0.06mm) 2Ring side clearance should be within specif ication and in shou ld move (spri g) free ly without catc hes3Replace piston as necessary