1-623-587-7400. Re: Measuring the piston ring groove condition Post by jake197000 » Sun Jun 30, 2019 2:20 am iclean the grooves by soda blasting gently.ya. the sliding surface of the ring must not protrude over the piston skirt. RINGS Spin all rings in grooves to be sure that the rings are free in the grooves. No portion of the inside diameter (I.D.) 6). The sketch in Figure 1 illustrates groove depths of a piston. In other words, back clearance should be as small as possible without having the ring … The top compression rings and second rings should have a side clearance of .002 to .004 unless the pistons are gas ported (with gas ports it is permissible to run the side clearance as tight as .0015. Search Our Catalog. The ring then expands from its initial diameter (d 1) and is forced tightly against the cylinder bore wall (Fig. Check ring side clearance with feeler gages. Today, we’re turning our focus to the areas of the piston most associated with the rings: the ring lands and grooves. "The piston grooves should be checked for taper and shoulders because a new ring cannot form a satisfactory seal. Insufficient cylinder lubrication. Regardless you need to have .0015" clearance between the ring and the groove… This clearance is important for free movement during operation and must be kept to a minimum to avoid ring hammering and ring groove wear. This demands a somewhat tight axial, or vertical, clearance between the ring groove and the piston. Once the piston grooves wear the ring … The piston ring must be free to move in its groove, therefore, a clearance is required. Fit the spacer expander into the ring groove, and ensure that the ends are butting as shown in the illustration. This is to avoid any possibility of the ring bottoming in the groove when the ring is compressed to its working diameter. Piston ring width sizes are usually right on the manufactured target. This clearance is referred to as back clearance. 4.5). Figure 4.6 shows a ring installed in the ring groove. Back Clearance. piston ring groove clearance. If the rings where fitted too high, the high temperatures would rapidly burn off the oil and the rings would seize in their grooves. Basic racing ring applications typically incorporate a plasma moly compression ring and medium to low-tension oil ring. This is important because, if there is no groove base clearance (incorrect ring or groove base carbonised), the ring function is not guaranteed. IMPORTANT: BEFORE FILING RINGS – Check each individual ring in its corresponding piston ring groove to ensure proper ring groove depth (radial back clearance) and side clearance (thickness)(fig. Since 1967, Total Seal has been the authority in piston ring design and technology for Vehicle, Diesel, Industrial, Marine and Aviation applications. Groove Depth: Grooves must be at least 0.015 inches deeper than the maximum radial wall thickness of the piston ring with a tolerance of +0.003/-0 inches. The permissible limits for acceptable groove wear will vary with the type of piston, the type of service, and the … By starting your search for parts at the ring design, you can find the rings that you want and then ask the piston manufacturer to cut the ring grooves in the piston to match the rings. 13. On older and obsolete engines it is not always possible to obtain new pistons at a reasonable cost. Optimum back clearance for a racing application is .000". The width (thickness) of the ring in the axial direction. Perhaps the place where wear can cost the most can be found in the top ring groove. Oil ring expander: Place the oil ring expander into the oil groove with the butted tips of the expander 90° from either end of the wrist pin. 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