Question about 1999 GMC Safari

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Timing on 1999 gmc safari is off

I replaced the distriter and the van will not start. I could not find any timing markes on the motor to line up the # 1 spark plug wire with the rotor.

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You can use a drinking straw inserted into the #1 spark plug hole and turn the crankshaft with a socket on a ratchet handle. The straw will serve as a makeshift dial indicator. When the straw is at the top of it's travel, you are approximately at tdc, but may be on the top of the exhaust stroke as well. If that happens, the rotor will be pointing towards the back of the engine instead of the front. At that point, you can either reference the #1 position as 180degrees opposite the rotor or turn one more time to get it pointing in the right direction. When re-installing, remember that the dist shaft turns as it goes down, but will stop above the fully down position if it does not engage the oil pump drive. If you are in the right position, you can have someone hand turn the engine as you hold light down pressure on the dist...you will feel it drop down when it properly engages. when you get the piston at tdc, take a look at where the hash mark on the damper pulley is...chances are you will find the timing scale. Don't use a screwdriver instead of a straw...if you bind it up in the cylinder you can bend a valve or damage pistion or cylinder wall...straw won't do that.

Posted on Jun 20, 2009

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