50 009 815 for ø 50–110 mm KS art. Of course, we will always respect the do-not-track (DNT) setting in your browser. in contact forms). Recommended minimum is .060". In this case, no tracking cookies are set and no tracking functions are loaded. We then use a liberal coating of Redline assembly lube. Chrome plated piston rings must not be installed in chrome plated cylinder liners. I broke a ring during the install, can I just use OEM rings with this piston? Be sure to thoroughly lubricate wrist pins and piston pin bores with an assembly oil to prevent galling on initial fire-up. Store your settings, such as the language selection or cookie banner, so that you do not have to repeat them in the future. Step 3) End gap: all Fuel Moto kits come with the ring end gap pre-set.

Ring orientation; Ring end gaps; Ring Dimension terminology; My ring pack has 3 rings, but my piston only has 2 ring grooves.

Perform these functions on a cloth towel or soft rubber pad so no damage to the piston occurs. Replace cracked or sunken and worn pistons. no. Step 1) unpackage and carefully inspect each surface. If the cylinder wear is higher than 0.1 mm for Otto engines and 0.15 mm for Diesel engines, the cylinder must also be replaced (top ring reversal bore wear). Clutch Basket Installation. Automotive Installation. The rings allow sealing of combustion pressure, they scrape the oil from the cylinder surface and also transfer heat from the piston into the cylinder wall. Motorservice Group uses cookies saved to your device in order to optimize and continuously improve its websites, as well as for statistical purposes. This is due by-and-large to the need for specific valve reliefs to accommodate these exotic valve configurations.

If the rings don’t have a dot or letter to mark “up”, check the ID of the ring and they should be beveled. Therefore, the piston must also have valve relief pockets that switch sides. The major thrust direction is the side that is against rotation. All Rights Reserved. Piston Orientation: Rights, Lefts, Tops, and Bottoms, Mixin' Gas, Makin' Memories: 2020 Wiseco 2-Stroke MX World Championships, Polaris RZR: Rebuilding the Legends with Wiseco, 2020 Wiseco 2-Stroke MX World Championships Are Back On, Loretta Lynn's Amateur Motocross Championships Daily History | Wiseco 2020, Loretta Lynn's Amateur Motocross Nationals From the Beginning | Wiseco. Very rarely will they be mis-boxed, but it does happen A good mechanic will leave nothing to chance. Or was the piston made incorrectly? WARNING: It is important that the correct number of locks are installed in each piston or severe engine damage may occur. If a sharp edge is present it will cause excessive piston skirt wear. Remove carbon residues at upper unused area of the cylinder liner. Stothers also explains that piston skirt design is another critical aspect. The gap should be a minimum of .010”. Piston rings are subject to wear as they move up and down the cylinder bore, due to their own inherent load and due to the gas load acting on the ring. “Some pistons have an offset wristpin and would need to be installed properly to have the desired effect of reducing piston noise. Rings having a “pip” mark or dot on the side of the ring must always be installed with the “pip” mark or dot toward the top of the piston. Figure 2 also contains the reason for the poor oil control. Rings with a groove in the outside diameter and a “pip” mark or dot on the side must be installed with the groove toward the bottom of the piston and pip mark towards the top of the piston. Proper cylinder finish (honing), ring end-gap, and lubrication are critical to achieving optimum ring seal.

Clearances listed below are minimum. ENGINE TECH. The pin offset direction will be towards the major thrust side of the engine.”. Proper ring end gap can more than double from one engine to the next depending upon the above factors. 4. Beyond the face of the piston, the correct orientation is also required for some piston skirt and wrist pin designs. For the best experience on our site, be sure to turn on Javascript in your browser. “On asymmetric piston designs, there is a wide skirt panel and a narrow skirt panel,” he explains. There will be a white sticker stating so on the packaging. This is primarily done to control piston noise. Most SRP pistons that require spiral locks will need 4 locks per piston, 2 at each end of the pin. Use caution not to install the rail tab into the wrist pin oil hole. Ring End Gap/Installation. Insert the piston rings into the respective piston ring groove with the correct fitting tool.Excessive spreading of the piston rings during mounting is to be avoided; this causes permanent deformations and affects the piston ring's performance.The “TOP” marking must point to the piston crown, so that the scraping effect is pointing to the skirt end of the piston. Further information on our use of cookies can be found here, together with our publication details and data protection notice. For example, you need the intake pockets to line up with the intake valves.”, This simple concept, if overlooked can lead to instant piston-to-valve contact, which would result in a wide range of possible engine damage. BEFORE BALANCING, installing pins, rods, or locks, please check the part number and description on box label to be sure you have the correct components. Regardless of the selection you choose, we will not draw any conclusions regarding you as a person (except where you have explicitly entered your details). FC 7.5.1-69 -----FC 7.5.1-30. * Rings having no dots, bevels, or grooves can be installed either way. What do I need to install a big bore kit on my H-D Milwaukee-8 bike? Figure 3 shows this graphically. In this process, the locking pin can move below the piston ring sprung outwards in the area of a cylinder window and break this off at the opposite window edge. 1). For this reason, always control the position of expander feathers before installing the pistons. FC 7.5.1-29. (fig. 1 0 obj <>/Metadata 2 0 R/Pages 3 0 R/StructTreeRoot 5 0 R/Type/Catalog>> endobj 2 0 obj <>stream The oil rails may be installed without modifying the end gap. “When we refer to ‘rights and lefts’ we are referring to how the valve orientation is on that specific cylinder,” Stothers adds. For example, if the engine rotates clockwise when viewed from the front pulley the major thrust would be to the left (against rotation).”.