Jass Performance Crankshaft Locking Tool For Mazda MX-5 NA & NB

2 Reviews


7 in stock

4 users have this item in wishlist

Jass Performance Crankshaft Locking Tool For Mazda MX-5 NA & NB

When working on your engine its sometimes necessary to remove the large 22mm nut on your crankshaft. When you do this, nothing is stopping the crankshaft from spinning.

Jass’s crankshaft locking tools sits on the lower pulley and locks the engine crankshaft in place.


  • Locks crankshaft in place
  • Powder-coated red

Please note this tool does not fit early shortnose MK1 (1989-90)


Weight 0.335 kg
Dimensions 15 × 6 × 3 cm

Jass Performance

2 reviews for Jass Performance Crankshaft Locking Tool For Mazda MX-5 NA & NB

  1. Ian Woolley (verified owner)

    Nice quality tool, the powder coat finish is first class. The tool doesn’t sit as the photos show in the listing, certainly not on my 1999 1.8 NB anyway. I had to use a much longer bolt (approx 140 mm) to attach through the oil pump into the block. Still does the job and locks the crank in position.

  2. Doug Marshall (verified owner)

    This is an excellent tool, well finished and straight forward to use. My 1.6 NB’s bolt would not have come off without this, and now I can get my timing belt changed! Speedy dispatch from BOFI Racing, inclulding a fridge magnet and logo sticker for the car.

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Make Model Year
Mazda MX-5 1989 - 2005

We Can Install This For You

Alongside part sales, we also operate a workshop service to install and configure all the products we offer online.

For the past decade, we’ve been servicing, modifying and boosting our own MX-5s. What started as three guys in a shed has grown into a workshop full to the brim of MX-5 knowledge and passion, where no project is too big or service job too small.

If you’d like to book something in or have a chat about your build, give us a call on +44 (0) 203 795 0515 or send us an email at [email protected]