Page 1 of 1
1987 Bonneville timing
Posted: Mon Oct 17, 2016 3:39 pm
by pontiacguy87
Hey guys and girls, I need some help. Im having a rather hard time getting the harmonic balancer bolt off. I have to replace the timing chain damper,( well Im replacing all of it while im in there, but thats what I was told was wrong with it.) I cant get the balancer bolt off how do I do this without a puller or air tools? Any advice is greatly appreciated.
Re: 1987 Bonneville timing
Posted: Mon Oct 17, 2016 6:19 pm
by pontiacguy87
Does anyone know what size the harmonic balancer bolt head is for a lg3?
Re: 1987 Bonneville timing
Posted: Mon Oct 17, 2016 9:17 pm
by MKMike
It should be either 15/16 or 1 1/8.
These are some general instructions for later models that may have some helpful tips
http://www.pontiacbonnevilleclub.com/fo ... c8267.html
Re: 1987 Bonneville timing
Posted: Mon Oct 17, 2016 10:23 pm
by RJolly87
I don't think the LG3 requires a puller, but I think it will take an obscene amount of torque to break it loose.
LN3+ has an inspection cover near the starter that can be removed (hopefully LG3 does too), and you can then jam a prybar in the teeth of the flex plate and hold the engine back from turning.
Re: 1987 Bonneville timing
Posted: Tue Oct 18, 2016 1:21 am
by pontiacguy87
thanks for the help. 
we'll see what happens tomorrow.
Re: 1987 Bonneville timing
Posted: Wed Oct 19, 2016 9:16 am
by MattStrike
I would advise against using the teeth on the flywheel, I've broken chunks off the trans bellhousing doing that.
The way that I've been doing it now is to put the prybar into one of the holes through the flywheel face, and let it bind against the block between the starter and the oil pan. The trans inspection cover does have to be removed for this still.