{"product_id":"lycoming-narrow-deck-cylinder-base-wrench-set-3-8-1-2-spline-type","title":"Lycoming Narrow Deck Cylinder Base Wrench Set – 3\/8\" \u0026 1\/2\" | Spline-Type","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eMake cylinder removal and installation easier with this professional-grade \u003cstrong\u003eLycoming Narrow Deck Cylinder Base Wrench Set\u003c\/strong\u003e. Specifically designed for the internal spline-style cylinder base nuts found on \u003cstrong\u003eLycoming Narrow Deck engines\u003c\/strong\u003e, this two-piece set includes the two sizes needed for servicing compatible cylinder installations.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe set includes both \u003cstrong\u003e3\/8\" and 1\/2\" spline-type wrenches\u003c\/strong\u003e, each with a \u003cstrong\u003e1\/2\" square drive\u003c\/strong\u003e for use with compatible ratchets, breaker bars, and torque wrenches.\u003c\/p\u003e\n\u003cp\u003eDrop-forged from \u003cstrong\u003e4130 steel\u003c\/strong\u003e and hardened to approximately \u003cstrong\u003e48 Rockwell\u003c\/strong\u003e, these specialty wrenches are built to withstand the demanding torque requirements of engine maintenance and overhaul work.\u003c\/p\u003e\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e2-Piece Cylinder Base Wrench Set\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eIncludes \u003cstrong\u003e3\/8\" and 1\/2\" sizes\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eInternal spline-type wrench design\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1\/2\" square drive\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eDesigned for \u003cstrong\u003eLycoming Narrow Deck cylinder base nuts\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFits compatible \u003cstrong\u003eIO-390 and IO-580\u003c\/strong\u003e applications\u003c\/li\u003e\n\u003cli\u003eDrop-forged from high-strength \u003cstrong\u003e4130 steel\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHardened to approximately \u003cstrong\u003e48 Rockwell\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned to resist wear and deformation\u003c\/li\u003e\n\u003cli\u003eSuitable for cylinder removal and installation\u003c\/li\u003e\n\u003cli\u003eProfessional engine maintenance and overhaul tool\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLycoming Narrow Deck Engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAll applicable Narrow Deck engine models\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eIO-390 Series\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eIO-580 Series\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNarrow Deck or Wide Deck?\u003c\/h3\u003e\n\u003cp\u003eAn easy way to determine which cylinder base wrench you need is to inspect the nuts securing the cylinder to the crankcase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNARROW DECK:\u003c\/strong\u003e\u003cbr\u003eRound cylinder base nuts with an \u003cstrong\u003einternal spline\u003c\/strong\u003e → \u003cstrong\u003eUse this wrench set\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWIDE DECK:\u003c\/strong\u003e\u003cbr\u003eCylinder base nuts resembling conventional \u003cstrong\u003eexternal hex nuts\u003c\/strong\u003e → Requires a Wide Deck-style cylinder base wrench\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTIP:\u003c\/strong\u003e Many Lycoming engines manufactured \u003cstrong\u003ebefore approximately 1960\u003c\/strong\u003e are Narrow Deck configurations. However, engine components may have been changed during previous repairs or overhauls, so the cylinder base nut style should always be visually verified before ordering.\u003c\/p\u003e\n\u003ch3\u003eIdeal for Engine Maintenance\u003c\/h3\u003e\n\u003cp\u003eThis wrench set is designed for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder removal\u003c\/li\u003e\n\u003cli\u003eCylinder installation\u003c\/li\u003e\n\u003cli\u003eCylinder replacement\u003c\/li\u003e\n\u003cli\u003eTop overhauls\u003c\/li\u003e\n\u003cli\u003eComplete engine overhauls\u003c\/li\u003e\n\u003cli\u003eCylinder base nut removal\u003c\/li\u003e\n\u003cli\u003eCylinder base nut installation and torquing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e(1) 3\/8\" Narrow Deck Cylinder Base Wrench\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e(1) 1\/2\" Narrow Deck Cylinder Base Wrench\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eAirboat Solutions\u003c\/h3\u003e\n\u003cp\u003eA must-have specialty tool when servicing \u003cstrong\u003eLycoming Narrow Deck engines\u003c\/strong\u003e. The spline-type design properly engages the unique internal cylinder base nuts, while the drop-forged 4130 steel construction provides the strength required for repeated engine maintenance and overhaul work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSet:\u003c\/strong\u003e 2 Pieces\u003cbr\u003e\u003cstrong\u003eSizes:\u003c\/strong\u003e 3\/8\" \u0026amp; 1\/2\"\u003cbr\u003e\u003cstrong\u003eDrive:\u003c\/strong\u003e 1\/2\" Square\u003cbr\u003e\u003cstrong\u003eStyle:\u003c\/strong\u003e Internal Spline\u003cbr\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Drop-Forged 4130 Steel\u003cbr\u003e\u003cstrong\u003eHardness:\u003c\/strong\u003e Approximately 48 Rockwell\u003c\/p\u003e","brand":"Airboat Solutions","offers":[{"title":"Default Title","offer_id":49389688291483,"sku":null,"price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/0075\/0235\/files\/5145a80c-3b7a-4bb7-a7f5-6585dd259a80.png?v=1787850795","url":"https:\/\/airboatsolutions.com\/products\/lycoming-narrow-deck-cylinder-base-wrench-set-3-8-1-2-spline-type","provider":"Airboat Solutions","version":"1.0","type":"link"}