Repair guides and support for C/K pickup trucks sold by General Motors under the GMC brand, including the GMC Sierra.

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How do I find Top dead center

I need to know how to find Top dead center on an 88 GMC. does anyone know how? Do i have to have a timing light?

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If your just looking for TDC you do not need a timing light . first you need to find the number one cylinder then remove the spark plug . Turn the engine by hand (use a socket and bar on the crank shaft ) until you have compression stroke . You can tell by putting your finger over the hole and feeling the air push against it . Once you have the compression stroke look on the crank pulley , there will be a mark to indicate TDC. align this mark with the timing mark , usually just off to the side of the pulley with makings on it. This video should help

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