The Vortec 4.3 Project - Part #1 *Now With Pic's*
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As a continuation to a continuation of http://www.bonnevilleclub.com/forum/...hlight=project , I am rebuilding the motor.
The crank was roasted. There was burnt oil in the oil outlets of the crank and mains.
The bearings on cylinder 3 or 4 were as thin as a razor
For the rods, 3 were good, 3 were shot, so there are 6 on the way.
The FACTORY installed plugs were still in after 11 years and 132,725 miles :? I am guessing that maintance was not a "big deal" with this poor motor
The gears in the oil pump looked like they had been sandblasted
I need new lifters. The old ones fell out when pulling the crank
I should replace the cam drive gear and chain. There was some good play in the chain.
The block is being bored out 30 over, line homed, hot tanked and magna-fluxed. I pick that up tomorrow and hopefully start rebuilding the lower end tomorrow afternoon
There was no physical damage to the block, thank God!, but it needed a good cleaning.
I know I need to post pics.
I cannot get to photobucket from work, but will tackle that tonight wehn I get home.
The crank was roasted. There was burnt oil in the oil outlets of the crank and mains.
![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
![Shocked](https://www.gmforum.com/gm/images/smilies/icon_eek.gif)
For the rods, 3 were good, 3 were shot, so there are 6 on the way.
![Cool](https://www.gmforum.com/gm/images/smilies/icon_cool.gif)
The FACTORY installed plugs were still in after 11 years and 132,725 miles :? I am guessing that maintance was not a "big deal" with this poor motor
The gears in the oil pump looked like they had been sandblasted
![Mad](https://www.gmforum.com/gm/images/smilies/icon_mad.gif)
I need new lifters. The old ones fell out when pulling the crank
![Embarassed](https://www.gmforum.com/gm/images/smilies/icon_redface.gif)
I should replace the cam drive gear and chain. There was some good play in the chain.
The block is being bored out 30 over, line homed, hot tanked and magna-fluxed. I pick that up tomorrow and hopefully start rebuilding the lower end tomorrow afternoon
![Clap](https://www.gmforum.com/gm/images/smilies/clap.gif)
I know I need to post pics.
![Embarassed](https://www.gmforum.com/gm/images/smilies/icon_redface.gif)
![Laughing](https://www.gmforum.com/gm/images/smilies/icon_lol.gif)
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I also purchased a 96 blazer with a blown motor. Had some difficulty getting the right connecting rod set because the 4.3 was built in two different factory'* and there were different connecting rod weights depending on the crankshaft casting no'*. I found out that there was 13 grams weight difference when I compared them. You should be okay although if your replacement set are the same weight.
Flatlander
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Here are soem of the truck. Friday, I hope to have more to post:
100_5298.jpg
100_5297.jpg
100_5296.jpg
100_5294.jpg
100_5283.jpg
000_0030.jpg
You can see where the piston was slapping the crap out of the head from that loose rod on cylinders 2 and 5
000_0028.jpg
000_0027-1.jpg
This is the "anti-sieze" picture. It is a beautifully blended 50/50 mix of metal shavings and Penzoil
Take good care of your vehicle. You do not want to know what this rebuild is costing me
000_0025-1.jpg
100_5298.jpg
100_5297.jpg
100_5296.jpg
100_5294.jpg
100_5283.jpg
000_0030.jpg
You can see where the piston was slapping the crap out of the head from that loose rod on cylinders 2 and 5
000_0028.jpg
000_0027-1.jpg
This is the "anti-sieze" picture. It is a beautifully blended 50/50 mix of metal shavings and Penzoil
![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
Take good care of your vehicle. You do not want to know what this rebuild is costing me
![Evil or Very Mad](https://www.gmforum.com/gm/images/smilies/icon_evil.gif)
000_0025-1.jpg
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