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Home >> Mazda >> 2007 >> B4000 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 331 (Engine Mechanical - Overhaul) >> Cylinder Head Inspection >> Valve Stem Oil Clearance >> Valve Clearance Inspection

Valve Clearance Inspection

WARNING: This page is about a different car, the 2007 Mazda B3000, 2006 Mazda B3000, 2005 Mazda B3000, 2004 Mazda B3000, and 2003 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:
    • Valve stem-to-valve rocker arm clearance should be within specification with the hydraulic valve tappet completely collapsed. Repeated valve reconditioning operations (valve and/or valve seat refacing) will decrease the clearance to the point that if it is not compensated for, the hydraulic valve tappet will cease to function and the valve will be held open.
    • The positive stop rocker arm bolts eliminate the necessity to adjust the valve clearance. However, to obtain the specified valve clearance, it is important that all valve components be in a serviceable condition and installed and tightened properly.
    • To determine whether a shorter or a longer push rod is necessary, make the following check.
  1. Position SST T71P-6513-B  or equivalent on the rocker arm.
  2. Slowly apply pressure to bleed down the valve tappet until the plunger is completely bottomed. Hold the valve tappet in this position and check the available clearance between the rocker arm and the valve stem tip with a feeler gauge.
    Fig 1: Checking Clearance Between Rocker Arm & The Valve Stem Tip
    G03312321Courtesy of MAZDA MOTORS CORP.
  3. If the clearance is less than specification, install a shorter push rod. If the clearance is greater than specification, install a longer push rod.
  4. With No. 1 piston on TDC at the end of compression stroke check the following valves:
    • No. 1 exhaust valve No. 1 intake valve
    • No. 3 exhaust valve No. 2 intake valve
    • No. 6 exhaust valve No. 4 intake valve
  5. Rotate crankshaft 360 degrees to position No. 2 and check the following valves:
    • No. 2 exhaust valve No. 3 intake valve
    • No. 4 exhaust valve No. 5 intake valve
    • No. 5 exhaust valve No. 6 intake valve
Fig 2: Rotating Crankshaft
G03312322Courtesy of MAZDA MOTORS CORP.
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