{"product_id":"powerbuilt-piston-ring-compressor-set-940387-2-7-8in-to-4-3-8in-bands-with-ratcheting-pliers-case","title":"Powerbuilt Piston Ring Compressor Set 940387 — 2-7\/8in to 4-3\/8in Bands with Ratcheting Pliers \u0026 Case","description":"\u003cp\u003e\u003cstrong\u003eThe Powerbuilt Piston Ring Compressor Set with ratcheting pliers (model 940387) compresses piston rings quickly and evenly for safe, damage-free piston installation across 2-7\/8\" to 4-3\/8\" diameters.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you’re replacing pistons or rebuilding an engine, compressing rings evenly is essential to avoid scoring bores or bending rings. This complete kit combines six interchangeable steel bands sized to cover a wide range of piston diameters with a ratcheting clamping tool that delivers controlled, incremental compression. Everything snaps into a heavy-duty carry case with laminated, permanently attached instructions so you can follow the right steps on the bench or in the bay.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this compressor set adapt to different piston sizes?\u003c\/h3\u003e\n\u003cp\u003eThe kit includes six band sizes that overlap to cover pistons from 2-7\/8\" (73 mm) up to 4-3\/8\" (111 mm). Each band slides over the piston and is tightened to the exact circumference you need, so one set fits many engines without stretching or modifying the rings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSix adjustable steel bands for precise diameter fits.\u003c\/li\u003e\n  \u003cli\u003eCovers incremental ranges: 2-7\/8\" to 3-1\/8\", 3-1\/8\" to 3-3\/8\" and up to 4-3\/8\".\u003c\/li\u003e\n  \u003cli\u003eOverlapping sizes reduce the need for additional compressors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy use the ratcheting pliers instead of a standard clamp?\u003c\/h3\u003e\n\u003cp\u003eThe included ratcheting lock pliers let you tighten the band gradually and hold pressure securely while you install the piston. Ratcheting action prevents sudden releases and allows one-handed control, helping maintain ring alignment during insertion into the cylinder.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRatcheting mechanism for consistent, repeatable compression.\u003c\/li\u003e\n  \u003cli\u003eLocking action holds the band firmly without slipping.\u003c\/li\u003e\n  \u003cli\u003eImproves safety and reduces the chance of ring distortion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat protection and reference materials are provided with the kit?\u003c\/h3\u003e\n\u003cp\u003eThe compressor set is stored in a robust carrying case that protects parts and keeps everything organized. Inside the lid you’ll find laminated, professionally written instructions with photos that remain readable even in a shop environment, so you can confirm proper technique anytime.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable molded carry case for transport and storage.\u003c\/li\u003e\n  \u003cli\u003eLaminated instruction sheet with step-by-step photos attached to the case.\u003c\/li\u003e\n  \u003cli\u003eInstructions developed by a repair manual writer for clear guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will this tool help during piston installation on the job?\u003c\/h3\u003e\n\u003cp\u003eBy holding rings uniformly compressed, the tool minimizes the risk of ring snagging or misalignment, making piston drop-in smoother and faster. The controlled compression also reduces potential damage to ring ends and the cylinder walls, letting you spend less time correcting installation errors.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSpeeds up piston installation with reliable ring control.\u003c\/li\u003e\n  \u003cli\u003eReduces rework from nicked rings or scored cylinders.\u003c\/li\u003e\n  \u003cli\u003eUseful for single-engine repairs and professional shop work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Powerbuilt 940387 piston ring compressor set is designed for home mechanics, mobile technicians, and professional engine shops who need a versatile, durable tool for piston installation across common small- and mid-size engine bores. It’s ideal for anyone rebuilding engines, replacing pistons, or performing cylinder work who wants a compact kit with clear instructions and dependable clamping performance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What piston diameters does this set cover?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Covers pistons from 2-7\/8\" (73 mm) up to 4-3\/8\" (111 mm) using six adjustable bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are instructions included with the kit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — laminated, photo-illustrated instructions are permanently attached inside the carry case.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Powerbuilt","offers":[{"title":"Default Title","offer_id":67585447526585,"sku":"B0028QGTP4","price":175.62,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/powerbuilt-front-view-case-open.jpg?v=1790470506","url":"https:\/\/redleafauto.ca\/products\/powerbuilt-piston-ring-compressor-set-940387-2-7-8in-to-4-3-8in-bands-with-ratcheting-pliers-case","provider":"Redleaf Auto","version":"1.0","type":"link"}