Honda DOHC Engine Valve Adjustment [DIY]

Posted by on May 12, 2010 in Accord, DIY | View Comments

Valve adjustments are very important, often overlooked regular maintenance tasks that should be performed on a regular basis. This DIY is for a DOHC engine, but the procedure for a SOHC valve adjustment is very similar.

Tools Needed For Valve Adjustment

  • Floor Jack
  • Flathead screwdriver
  • 12mm wrench
  • 10mm socket
  • Ratchet for the socket
  • Feeler gauge
  • Long extension(not in pic)
  • 19mm socket for crank pulley(not in pic)
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DOHC Valve Adjustment procedure

F22B DOHC and H23 specs
Intake: 0.07mm-0.11mm(.003″-.004″)
Exhaust: 0.15mm-0.19mm(.006″-.007″)
If performing this procedure on an engine other than the F22B DOHC or H23a, please determine the proper valve clearance specs.
  1. Start by taking off your valve cover. there are 5 nuts holding it down, plus any other things like grounds and what not.
    2. dohc_valve_adjustment2
  2. Lift the driver side of your car with the jack. then, turn the wheel all the way to the LEFT. Now you have room get your extension/19mm socket/ratchet in and turn the crank pulley counter clockwise!
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  3. Turn it until your #1 cylinder(closest to timing belt) is at TDC. In other words, the arrow on your cam gear will be pointing up.
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  4. Now that #1 is at TDC, get your 12mm wrench and loosen the nut.
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  5. Get your screw driver and feeler gauge and feel for a slight drag. Not tight, not completely loose, but enough to where you can feel it touching bot sides. use the screwdriver to adjust the lash.
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  6. Once you have it at your desired setting, hold the screwdriver STILL and IN PLACE and tighten the nut. Re-check your lash because you screw could have moved.
    7. Intake and Exhaust both have two valves each, make sure you do this to both.
  7. When you’re done with cylinder #1, go back to your crank pulley and turn it enough to where the next “spoke” on the cam gear is pointing up. this will be TDC for #3.
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    The fireing order is 1-3-4-2. You should perform these steps on each cylinder, in that order
  8. Go ahead and put your valve cover on. I tighten mine just enough to where i dont actually need to hold my breathe or need extra force to tighten it. (i.e. hand tight).
    9. It is the same procedure for a VTEC engine, except they need a differnt tool to tighten/loosen the nut that holds the screw. H22′s have a 10mm nut instead of the 12mm

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