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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: gold84gmc on January 24, 2009, 01:10:41 pm

Title: timing adjustment
Post by: gold84gmc on January 24, 2009, 01:10:41 pm

does anyone know if there is supposed to be a tab on the harmonic balancer for the timing?...and if there is where on it is it supposed to be?...because i tried looking for one on my truck and i couldnt find one....i have an 84 gmc with a 350

Title: Re: timing adjustment
Post by: frogman68 on January 24, 2009, 01:35:02 pm

The balancer should have a groove (from say the timing cover to the pulley)across it that will line up with the tab on the timing chain cover

Title: Re: timing adjustment
Post by: dumbucket1 on January 24, 2009, 01:37:38 pm

does your truck still have a timing tab? I have came across many with them missing. It would be on the timing cover either directly below the water pump or to the right near the power steering pump.

Title: Re: timing adjustment
Post by: BlueCollarRon on January 24, 2009, 03:50:45 pm

you most likely have a shiny chrome plate with the tabs missing, like mine.... (82 gmc 350)

Unless you buy a bolt on timing plate, you have to check timing with a vaccum gauge.

Title: Re: timing adjustment
Post by: 78 Chevyrado on January 24, 2009, 04:27:24 pm

Here's a pic of what you should have  that tab at 2 oclock over the balancer.  If you don't have it you need to buy a bolt on tab
(http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/engine002.jpg)

Here's an aftermarket bolt on tab:
(http://www.gilbertautoparts.com/ChevySmallBlockV8s/images/pro202.215b.jpg)

Title: Re: timing adjustment
Post by: gold84gmc on January 24, 2009, 04:28:49 pm

how do you check the timing with a vacuum gauge?

Title: Re: timing adjustment
Post by: frogman68 on January 24, 2009, 05:12:56 pm

Quote from: gold84gmc on January 24, 2009, 04:28:49 pm

how do you check the timing with a vacuum gauge?

Hook up the vacuum gage adjust the dizzy until you get the highest reading. Not sure if I would do it this way timing lights are cheap. Check your sticker under the hood to see what it should be set to. Not sure on your year if it has the ESC that (if it is still hooked up) you will have to disconnect that.