{"title":"Engine \u003e Valves \u0026 Cylinder Head Components","description":"","products":[{"product_id":"genuine-mazda-exhaust-valve-mx-5-mk2-nb-1-8-02-05-bp6f-12-121","title":"Genuine Mazda Exhaust Valve • BP6F-12-121","description":"\u003cdiv\u003e\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003e\u003cstrong\u003eGenuine Mazda BP6F-12-121 Exhaust Valve\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003eReplacement Genuine Mazda exhaust valve for \u003cstrong\u003eMazda MX-5 Mk2.5 \/ NB facelift models fitted with the 1.8L BP-Z3 VVT petrol engine from 2002 to 2005\u003c\/strong\u003e listed in the compatibility table.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003eThe exhaust valve is located within the cylinder head and controls the flow of burned combustion gases from the combustion chamber into the exhaust port. It operates through the camshaft, valve lifter, valve spring, upper retainer and collet assembly.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eDuring engine operation, the valve repeatedly opens against combustion pressure and closes against the machined valve seat. Because exhaust valves are directly exposed to hot combustion gases, their material specification, stem dimensions and sealing-face geometry are critical to reliable engine operation.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eThis listing supplies one Genuine Mazda exhaust valve. The BP-Z3 engine uses eight exhaust valves, so eight are required when replacing the complete exhaust-valve set. Inlet and exhaust valves are different components and must not be interchanged.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eReplacement may be required where the original valve is burned, bent, cracked, pitted, excessively worn or no longer seals correctly against the valve seat. Possible symptoms include low compression, misfiring, reduced engine power, poor idle quality, increased emissions or leakage identified during cylinder-head testing.\u003c\/p\u003e\n\n\u003cul style=\"margin: 0 0 8px; padding-left: 18px;\"\u003e\n\u003cli\u003ePart type: Exhaust valve\u003c\/li\u003e\n\u003cli\u003ePrimary use: Controls exhaust-gas flow from the combustion chamber into the exhaust port\u003c\/li\u003e\n\u003cli\u003eLocation: Cylinder head \/ exhaust side of the valvetrain\u003c\/li\u003e\n\u003cli\u003eEngine application: Mazda MX-5 Mk2.5 1.8L BP-Z3 VVT petrol engine\u003c\/li\u003e\n\u003cli\u003eQuantity per cylinder: Two exhaust valves\u003c\/li\u003e\n\u003cli\u003eQuantity per engine: Eight exhaust valves\u003c\/li\u003e\n\u003cli\u003eQuantity supplied: One exhaust valve\u003c\/li\u003e\n\u003cli\u003eBrand: Genuine Mazda\u003c\/li\u003e\n\u003cli\u003ePart No.: BP6F-12-121\u003c\/li\u003e\n\u003cli\u003eAlso referenced as: BP6F12121\u003c\/li\u003e\n\u003cli\u003eAssociated Mazda references: BP4W-10-100 and BP6D-10-100\u003c\/li\u003e\n\u003cli\u003eFitment distinction: Intended for the confirmed facelift 1.8L VVT application shown in the compatibility table\u003c\/li\u003e\n\u003cli\u003eImportant note: The inlet and exhaust valves are separate components and are not interchangeable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eFitment advice:\u003c\/strong\u003e Confirm that the engine is the facelift 1.8L BP-Z3 VVT unit and compare the original valve dimensions and cylinder-head application before assembly. Any cylinder head that has previously been rebuilt with non-standard valves, guides or seats should be measured carefully before ordering replacement components.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eOther items to consider:\u003c\/strong\u003e When changing this part, you may also want to consider purchasing valve stem oil seals, valve guides, valve springs, upper spring retainers, valve collets, hydraulic or mechanical adjustment components, a cam-cover gasket, cylinder-head gasket, head bolts, timing belt and tensioner components.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eUseful tools \/ consumables:\u003c\/strong\u003e Valve spring compressor, valve-guide measuring equipment, micrometer, dial gauge, valve-seat testing equipment, valve-lapping tools where appropriate, clean assembly lubricant, calibrated torque wrench and the correct Mazda-compatible camshaft and timing tools.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eDifficulty guide:\u003c\/strong\u003e DIY Difficulty: Advanced \/ Engine Reconditioning. Replacement requires cylinder-head and valvetrain dismantling. Valve-guide clearance, valve-seat contact, installed height and sealing must be measured and corrected as necessary before the engine is reassembled.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eWhy Genuine Mazda?\u003c\/strong\u003e Genuine Mazda exhaust valves are manufactured to the intended stem diameter, overall length, head profile, seat angle, material specification and heat-resistance requirements. Using the correct OE valve helps retain reliable sealing, correct valvetrain geometry and compatibility with the original Mazda valve guide, seat, spring and retaining components.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eWhat’s in the box:\u003c\/strong\u003e One Genuine Mazda exhaust valve, part number BP6F-12-121. Valve stem seal, spring, retainer, collets and other cylinder-head components are not included.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eInstallation notes:\u003c\/strong\u003e Inspect and measure the valve guide, valve seat and adjoining valvetrain components before installation. Confirm the valve seating pattern and valve-to-guide clearance, and carry out any required cylinder-head machining using suitable specialist equipment. Lubricate the valve stem during assembly, install a new valve stem seal and follow the applicable Mazda workshop procedure for camshaft timing, valve-clearance checks and cylinder-head assembly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Genuine Mazda","offers":[{"title":"Default Title","offer_id":55697498833278,"sku":"BP6F-12-121","price":54.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/8274\/9408\/files\/genuine-mazda-exhaust-valve-mx-5-mk2-nb-1-8-02-05-bp6f-12-121-motor-vehicle-parts-302.webp?v=1749219236"},{"product_id":"genuine-mazda-valve-spring-retainer-mx-5-mk3-nc-2-0-1-8-06-15-lf01-12-113","title":"Genuine Mazda Upper Valve Spring Retainer • LF01-12-113","description":"\u003cdiv\u003e\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003e\u003cstrong\u003eGenuine Mazda LF01-12-113 Upper Valve Spring Retainer\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003eReplacement Genuine Mazda upper valve spring retainer for \u003cstrong\u003eMazda MX-5 Mk3, Mk3.5 and Mk3.75 \/ NC models with 1.8L and 2.0L petrol engines from 2005 to 2015\u003c\/strong\u003e listed in the compatibility table.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003eThe upper valve spring retainer—also described as the upper valve spring seat—fits above the valve spring in the cylinder head. Its tapered central opening receives the two valve collet halves, which engage with the groove on the valve stem and secure the valve, spring and retainer assembly together.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eThe retainer transfers the valve spring load into the collets and valve stem while keeping the upper end of the spring correctly located. Correct engagement between the retainer, collets and valve-stem groove is essential for reliable valvetrain operation.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eThis listing supplies one Genuine Mazda valve spring retainer for one valve. The Mazda MX-5 NC uses a 16-valve cylinder head, so 16 retainers are required when replacing all retainers throughout one complete engine.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eReplacement is normally carried out during a cylinder-head rebuild, valve replacement, valve-spring replacement or other valvetrain repair. A retainer should also be replaced if it is cracked, distorted, excessively worn, corroded, marked around the collet seat or damaged during disassembly.\u003c\/p\u003e\n\n\u003cul style=\"margin: 0 0 8px; padding-left: 18px;\"\u003e\n\u003cli\u003ePart type: Upper valve spring retainer \/ upper valve spring seat\u003c\/li\u003e\n\u003cli\u003ePrimary use: Retains the top of the valve spring and receives the valve collets\u003c\/li\u003e\n\u003cli\u003eLocation: Cylinder head \/ valvetrain\u003c\/li\u003e\n\u003cli\u003eEngine applications: Mazda MX-5 NC 1.8L L8-DE and 2.0L LF-VE\u003c\/li\u003e\n\u003cli\u003eQuantity per valve: One\u003c\/li\u003e\n\u003cli\u003eQuantity per 16-valve engine: 16\u003c\/li\u003e\n\u003cli\u003eQuantity supplied: One retainer\u003c\/li\u003e\n\u003cli\u003eBrand: Genuine Mazda\u003c\/li\u003e\n\u003cli\u003ePart No.: LF01-12-113\u003c\/li\u003e\n\u003cli\u003eAlso referenced as: LF0112113\u003c\/li\u003e\n\u003cli\u003eEarlier Mazda reference: 1F20-12-122 \/ 1F2012122\u003c\/li\u003e\n\u003cli\u003eAssociated valve collet pair: LF01-12-114\u003c\/li\u003e\n\u003cli\u003eFitment note: Suitable for the confirmed Mazda MX-5 applications shown in the compatibility table\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eFitment advice:\u003c\/strong\u003e Confirm that the engine retains the original Mazda valve-stem groove, valve collets, valve spring and retainer arrangement. Engines fitted with non-standard valves, upgraded valve springs or aftermarket retainers should be checked carefully because the collet taper, spring dimensions and valve-stem groove may differ.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eOther items to consider:\u003c\/strong\u003e When changing this part, you may also want to consider purchasing the corresponding LF01-12-114 valve collet pair, valve stem oil seals, valve springs, inlet or exhaust valves, valve-clearance adjustment buckets, cam-cover gasket, cylinder-head gasket, head bolts and timing-chain components where the cylinder head is being rebuilt.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eUseful tools \/ consumables:\u003c\/strong\u003e Suitable valve spring compressor, magnetic pick-up tool, small non-damaging pick, clean component trays, engine assembly lubricant, socket set, calibrated torque wrench, clean workshop towels and the appropriate timing tools if the camshafts or timing components are removed.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eDifficulty guide:\u003c\/strong\u003e DIY Difficulty: Advanced. Installation requires controlled compression of the valve spring and accurate placement of both valve-collet halves. The retainer and collets must seat concentrically and securely before the spring compressor is fully released.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eWhy Genuine Mazda?\u003c\/strong\u003e Genuine Mazda valve spring retainers are manufactured to the intended spring location, collet-seat taper, dimensions, hardness and material specification. Using the correct OE retainer helps ensure secure collet engagement, accurate spring positioning and reliable compatibility with the original Mazda valves and valvetrain components.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eWhat’s in the box:\u003c\/strong\u003e One Genuine Mazda upper valve spring retainer, part number LF01-12-113. The valve spring, valve, collets and valve stem seal are not included.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eInstallation notes:\u003c\/strong\u003e Keep all valvetrain components clean and free from debris. Inspect the valve-stem groove, collets, spring and retainer before assembly. Compress the valve spring sufficiently to install both collet halves without forcing them. Release the spring compressor slowly and confirm that the collets are seated evenly within the retainer. Do not rotate or operate the engine until every installed valve-retaining assembly has been inspected for correct engagement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Genuine Mazda","offers":[{"title":"Default Title","offer_id":55728033694078,"sku":"LF01-12-113","price":3.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/8274\/9408\/files\/genuine-mazda-valve-sear-spring-retainer-mx-5-mk3-nc-2-0-1-8-06-15-lf01-12-113-motor-vehicle-parts-902.webp?v=1749739472"},{"product_id":"genuine-mazda-valve-seat-spring-retaining-clotter-mx-5-mk3-nc-2-0-1-8-06-15-lf01-12-114","title":"Genuine Mazda Valve Spring Retaining Collet Pair • LF01-12-114","description":"\u003cdiv\u003e\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003e\u003cstrong\u003eGenuine Mazda LF01-12-114 Valve Spring Retaining Collet Pair\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003eReplacement Genuine Mazda valve spring retaining collet pair for \u003cstrong\u003eMazda MX-5 Mk3, Mk3.5 and Mk3.75 \/ NC models with 1.8L and 2.0L petrol engines from 2005 to 2015\u003c\/strong\u003e listed in the compatibility table.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px; font-size: calc(14px + 0.1vw);\"\u003eValve spring retaining collets—also known as valve cotters, valve locks or valve keepers—are small precision components fitted around the grooved upper section of each valve stem. The tapered collets engage with the valve spring retainer and secure the valve, spring and retainer assembly together.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eEach valve uses one matched pair of collet halves. When the valve spring compressor is released, the spring retainer closes around the tapered collets and locks them securely into the groove in the valve stem.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eThis listing supplies one complete pair of Genuine Mazda valve collets for one valve. The Mazda MX-5 NC uses a 16-valve cylinder head, so 16 pairs are required when replacing the collets throughout one complete engine.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003eThese parts are commonly replaced during a cylinder-head rebuild, valve replacement, valve-spring replacement or other valvetrain work. Replacement may also be necessary where an original collet has become worn, marked, distorted, damaged or lost during disassembly.\u003c\/p\u003e\n\n\u003cul style=\"margin: 0 0 8px; padding-left: 18px;\"\u003e\n\u003cli\u003ePart type: Valve spring retaining collet \/ valve cotter \/ valve lock\u003c\/li\u003e\n\u003cli\u003ePrimary use: Locks the valve spring retainer to the valve stem\u003c\/li\u003e\n\u003cli\u003eLocation: Cylinder head \/ valvetrain\u003c\/li\u003e\n\u003cli\u003eEngine applications: Mazda MX-5 NC 1.8L L8-DE and 2.0L LF-VE\u003c\/li\u003e\n\u003cli\u003eQuantity per valve: One pair\u003c\/li\u003e\n\u003cli\u003eQuantity per 16-valve engine: 16 pairs\u003c\/li\u003e\n\u003cli\u003eQuantity supplied: One pair comprising two collet halves\u003c\/li\u003e\n\u003cli\u003eBrand: Genuine Mazda\u003c\/li\u003e\n\u003cli\u003ePart No.: LF01-12-114\u003c\/li\u003e\n\u003cli\u003eAlso referenced as: LF0112114\u003c\/li\u003e\n\u003cli\u003eRelated Mazda references: LF02-12-114 and 1F20-12-114\u003c\/li\u003e\n\u003cli\u003eFitment note: Suitable for the confirmed Mazda MX-5 applications shown in the compatibility table\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eFitment advice:\u003c\/strong\u003e Confirm that the engine retains the original Mazda valve, valve-stem groove and spring-retainer arrangement. Engines that have been rebuilt or fitted with non-standard valves, springs or retainers should be checked carefully to ensure that the taper and valve-stem groove match before assembly.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eOther items to consider:\u003c\/strong\u003e When changing this part, you may also want to consider purchasing valve stem oil seals, valve spring retainers, valve springs, replacement inlet or exhaust valves, valve-clearance adjustment buckets, a cam-cover gasket, cylinder-head gasket, head bolts and timing-chain components where the cylinder head is being rebuilt.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eUseful tools \/ consumables:\u003c\/strong\u003e Suitable valve spring compressor, magnetic pick-up tool, small non-damaging pick, clean assembly tray, engine assembly lubricant, socket set, calibrated torque wrench, clean workshop towels and the appropriate timing tools if the camshafts or timing components are removed.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eDifficulty guide:\u003c\/strong\u003e DIY Difficulty: Advanced. Installation normally requires valvetrain disassembly and controlled compression of the valve spring. Both collet halves must seat evenly and securely in the valve-stem groove before the spring compressor is fully released.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eWhy Genuine Mazda?\u003c\/strong\u003e Genuine Mazda valve collets are manufactured to the intended taper, hardness, dimensions and valve-stem groove profile. Using the correct OE components helps ensure that the spring retainer locks securely to the valve and reduces the risk of retainer movement, abnormal valvetrain wear or serious internal engine damage.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eWhat’s in the box:\u003c\/strong\u003e One pair of Genuine Mazda valve spring retaining collets, part number LF01-12-114, comprising two matching collet halves for one valve.\u003c\/p\u003e\n\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eInstallation notes:\u003c\/strong\u003e Keep all valvetrain components clean and free from debris. Position both collet halves evenly in the valve-stem groove while the spring is compressed. Release the valve spring compressor slowly and confirm that the collets seat concentrically within the spring retainer. Do not rotate or operate the engine until every installed pair has been inspected for correct engagement. Follow the applicable Mazda workshop procedure for cylinder-head and valvetrain assembly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Genuine Mazda","offers":[{"title":"Default Title","offer_id":55728172269950,"sku":"LF01-12-114","price":3.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/8274\/9408\/files\/genuine-mazda-valve-seat-spring-retaining-clotter-mx-5-mk3-nc-2-0-1-8-06-15-lf01-12-114-motor-vehicle-parts-264.webp?v=1749742655"}],"url":"https:\/\/www.mazspec.co.uk\/collections\/engine-valves-cylinder-head-components.oembed","provider":"MazSpec","version":"1.0","type":"link"}