Valve Clearance Inspection / Adjustment - 2.3L

WARNING: This page is about a different car, the 2007 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

Remove the valve cover. See VALVE TAPPET REMOVAL / INSTALLATION - 2.3L , .
CAUTION:
- Turn the engine clockwise only, and use the crankshaft bolt only.
NOTE:
- Measure each valve's clearance at base circle with the lobe pointed away from the tappet, before removing the camshafts. Failure to measure all clearances prior to removing the camshafts will necessitate repeated removal and installation and wasted labor time.
Use a feeler gauge to measure each valve's clearance and record its location.

Fig 1: Measuring Valve Clearance
Courtesy of MAZDA MOTORS CORP.
NOTE:
- A midrange clearance is the most desirable:
- intake: 0.22-0.28 mm (0.008-0.011 inch)
- exhaust: 0.27-0.33 mm (0.010-0.013 inch)
NOTE:
- Select tappets using this formula: tappet thickness = measured clearance plus the base tappet thickness minus most desirable thickness.
Select tappets and mark installation location.
If any tappets do not measure within specifications, install new tappets in those locations. See VALVE TAPPET REMOVAL / INSTALLATION - 2.3L , .