Question about 1991 Isuzu Rodeo

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TDC in Haynes Manual- Isuzu Rodeo TF 1991

I always thought that if changing a blown head gasket,or any engine work, you set all timing marks using No.1 cylinder as your starting point and,once set you didnt alter anything.However the Haynes manual (41753) states that before removing the camshaft I should bring No 4 to TDC on the compression stroke. Which is correct ?

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  • Dick
    Dick May 11, 2010

    In the good old days when V-8s ruled the earth it was always #1 cylinder. The timing mark on the harmonic balancer was positioned so the engine could be timed with the valve covers in place.

    BUT, there is no reason things HAVE to be done that way. If Isuzu has the #4 cylinder right next to the timing apparatus they may very well use #4. It is worth a call to your local mechanic or Isuzu shop to double check.

    Here is what I would do. Follow the Haynes manual. When you get the timing set WITH THE SPARK PLUGS OUT, turn the motor over by hand and make sure it rotates freely. You will get some resistance as the cams open the valves but if you encounter resistance like a valve hitting the top of a piston STOP.

    And consider re-rating MrScary's solution. Haynes procedure can use any cylinder position, they chose #4 and if you follow their procedure for removal and installation the timing will be exactly as it was when you took the cam out, which is what it should be.



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No. 4 to Top Dead Center is Correct.

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