Which Miatas have short nose cranks?
If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.)
What is crankshaft keyway?
A keyway is a square channel machined into round a steel bar. The channel, or keyway, provides a place for a square piece of metal known as a key to lock a pulley or sprocket onto the round bar. In automobile engines, the crankshaft has a keyway machined into the snout end that holds the harmonic balancer in position.
How much does it cost to replace a crankshaft on a Miata?
Replacement of the crankshaft requires removal of the engine. The crankshaft costs about $450. Miscellaneous parts and labor must push the repair into the neighborhood of $1500. THE CRANKSHAFT MUST BE REPLACED? Your choices are to replace the crankshaft, substitute a nice used engine from a salvage yard, or install a new factory short block.
How big is the pulley bolt on a Mazda Miata?
If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.) The pulley bolt shoulder diameter is 1.128 inches.
Where to put the crankshaft key on a Miata?
If the tip of the crankshaft is closer to 1/2 inch back in there, you have the dreaded short nose part. Withdraw the key with needle nose pliers. Make note of the chamfered corner, it should be on the back of the key and face toward the crankshaft. The key should not be bent, deformed, or mooshed.
What happens if the crankshaft nose breaks off a Miata?
If the crankshaft nose breaks off, this is easy for a mechanic to diagnose. The car will not run and the mechanic finds the pulley assembly laying on the lower splash shield. In all examples, repair is the same; replace the crankshaft. I CAN HAVE A PROBLEM WITHOUT NOTICING?
How big is the crankshaft on a Mazda Miata?
If you’d like, verify the stronger crankshaft and larger bolt are fitted by measuring the bolt shoulder diameter to be 1.455 inches. If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.)…
If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.) The pulley bolt shoulder diameter is 1.128 inches.
If the tip of the crankshaft is closer to 1/2 inch back in there, you have the dreaded short nose part. Withdraw the key with needle nose pliers. Make note of the chamfered corner, it should be on the back of the key and face toward the crankshaft. The key should not be bent, deformed, or mooshed.
If the crankshaft nose breaks off, this is easy for a mechanic to diagnose. The car will not run and the mechanic finds the pulley assembly laying on the lower splash shield. In all examples, repair is the same; replace the crankshaft. I CAN HAVE A PROBLEM WITHOUT NOTICING?