Removal (MX-5 Miata - DOHC)

Disconnect negative battery cable. Drain cooling system. Remove radiator hose and by-pass hoses from thermostat housing. Remove air cleaner intake duct assembly from throttle body to air cleaner filter housing. Remove splash shield.
Remove drive belt(s) and water pump pulley. See Fig 1. Align crankshaft pulley timing mark with cylinder No. 1 at TDC of compression stroke. Hold crankshaft pulley stationary. Remove crankshaft pulley bolts. Remove pulley. Remove crankshaft pulley hub bolt and hub.
Remove cylinder head cover. Remove upper, center and lower timing belt cover. If timing belt is to be reused, mark timing belt rotation direction. Ensure timing marks on camshaft sprockets are aligned. See Fig 2. Loosen timing belt tensioner lock bolt, and move tensioner away from belt with spring fully expanded. Remove timing belt.

Fig 1: Exploded View Of Timing Belt & Components (DOHC MX-5 Miata)

Courtesy of MAZDA MOTORS CORP.

Fig 2: Aligning Camshaft Timing Marks (DOHC MX-5 Miata)

Courtesy of MAZDA MOTORS CORP.