Cyl. Block, Liners, Pistons & Rods/Piston SECOND AND THIRD PISTON RING GROOVES Use a new piston ring and feeler gauge. Ring groove clearance must not exceed 0.20 mm (0.008 in.). If clearance exceeds specification, install a new piston. RG5625 -UN-28MAR90 CD,3274,G10,7 -19-18FEB92 PISTON RING IDENTIFICATION Depending on engine configuration, piston rings no.1 and 2 are different. • On following engines, compression rings (no.1 and 2) may have either one or two depression marks (A) or a “TOP” mark stamped on the top side of rings. - 3029DF001..., DF031... - 3029TF001..., TF031... ( -264812CD) - 3029DF120..., DF160... ( -263023CD) - 3029TF120..., TF160...
( -287525CD) - 3029TLV01 ( -261580CD) - 3029DRT65 A—Depression marks B—“TOP” mark • On all other engines, no.1 compression ring has a blue C—Yellow or blue dye mark dye mark (C) and no.2 ring a yellow dye mark on the face of the ring. Dye marks must be on the left side of ring gap as shown. RG6400 -UN-21AUG92 CTM3274 (01JUL99) 10-29 Saran Liter Engines CD,3274,G10,53 -19-04JAN99 060799 PN=90 PISTON HEAD AND SKIRT CHECKING Check piston for scuffing, scoring, or signs of overheating. -UN-10MAY95 Measure piston diameter 19 mm (0.74 in.) from bottom of skirt and 90˚ from piston pin. Compare measurement with “Specifications”. CD30391 CD,3274,G10,8 -19-01FEB94 10 29