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View listing at Treasure Coast Miata; opens in a new tabMiata · Buyer's guide
NA Miata Crank Pulley / Woodruff Key / Short-Nose Crank Trap
NA Miata 1.6 1990-93 / NA 1.8 1994-97
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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View listing at Treasure Coast Miata; opens in a new tabNASeller listing
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View listing at Midwestmiataparts; opens in a new tabNASeller listing
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View listing at Miata Source; opens in a new tabNASeller listing
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What you need to know
Gate 1 verified for the classic NA Miata short-nose crank trap. Trap: early 1.6 short-nose crank cars can wallow the crank keyway if the crank pulley/bolt/key stack is loose or serviced wrong. Do not sell this as just a $7 key problem; if the keyway is damaged, buyer may need inspection, Loctite 660-style repair, or crank/engine replacement.
OEM numbers
Mazda B630-11-317A short-nose crank woodruff key for 1990-1991.5 NA6up to VIN 209447. Mazda B3C7-11-317 long-nose/big-nose style crank woodruff key for 1991.5-2005from VIN 209447. Short-nose repair kits also commonly include timing belt pulley, crank bolt, and key.Supersession
No simple supersession; this is a generation/VIN split, not a normal replacement chain. Short-nose key B630-11-317A fits early 1990-1991 cars up to VIN 209447. Later/long-nose key B3C7-11-317 fits from VIN 209447 and later applications into 2005.
Fitment
Gate 1 verified for the classic NA Miata short-nose crank trap. Trap: early 1.6 short-nose crank cars can wallow the crank keyway if the crank pulley/bolt/key stack is loose or serviced wrong. Do not sell this as just a $7 key problem; if the keyway is damaged, buyer may need inspection, Loctite 660-style repair, or crank/engine replacement.
Aftermarket options
Checked genuine Mazda key paths: Treasure Coast B630-11-317A for early short-nose cars; Treasure Coast and Midwest Miata B3C7-11-317 for later cars. The part-number boundary is described inconsistently at VIN 209447 across sellers, so use VIN plus physical crank/pulley identification before ordering. A new key is only a service part; it is not evidence that a damaged keyway is repairable without inspection.
Before you buy
Seller wording conflicts at VIN 209447, so verify VIN and physically identify the crank/pulley before ordering. A new key does not repair a wallowed crank keyway. If the pulley wobbles, stop driving and inspect the crank nose, bolt, sprocket and keyway before buying parts.
Research and fitment sources
Supersede reviewed 9 unique research sources for this guide. 5 also appear above as a seller or official action and are not repeated here; 4 additional citations follow.
Research last verified .