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by bullock00 on August 30th, 2009
Thanks for telling me how to set the TDC but when I drop the distibuter what should the Rotor be pointing at. On my 98 GMC 350 it seems that I have only two options because of the oil shaft. Can anybody explain what the rotor should be pointing at once I've found TDC? It's seems like it should point to the number one cylinder but I don't know.
by Camaro253 on July 16th, 2008
You can be at top dead center either on the compression stroke, or the exhaust stroke, so you need to be on the compression stroke. You can do this by spinning the engine with your finger over the #1 spark plug hole, and when it blows your finger off you are on the right stroke. Do this with all plugs removed. Or, you can get a slurpy straw, remove the number 1 plug and all others, stick the straw in the #1 hole and wait tell the straw raises up. Once it raises up you can make marks on the straw like a ruler and judge where TDC is by seeing when the straw goes back down. Dont use anything other then a straw so it doesnt break off in the cylinder. If you don't have a way to spin the engine such as, it its not in the vehicle, remove the valve cover on the drivers side to see the #1 rockers. Turn the engine until you have the piston up, and both valves closed, as in the rockers are relaxed on both intake & exhaust. Simple, simple, simple. I just did this today to.
by Jim_S3124 on November 8th, 2010
I have been told to look for a number 6 and a number 8. line up with the number 8 because you have an 8 cylinder engine for tdc on number one piston
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Comments
Yes, number one on the compression stroke. The oil pump driveshaft can be turned with a long screwdriver to match up with the distributor.
by That Guy Again on September 1st, 2009