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How do you rebuild the bottom half of a 3800 motor for a Pontiac Bonneville?

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βˆ™ 2006-08-06 15:22:34

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Don't bother. To rebuild the "bottom end", you need to have the crankshaft turned or at a minimum, cleaned and polished. You can't do that with the engine in the vehicle. To adequately do the "bottom end", you also need to have the rod bearings reconditioned, that means that you need new wrist pins and usually need to have the "big end" machined to undo the damaged caused by stretching of the rod. Once the engine is out and you've pulled the pistons to do the rod recondition, you may as well do the valves and check the cylinders for taper/wear. If the cylinders have any amount of wear, they should be bored and new pistons put back. Whenever the heads are off you should recondition the valves and guides and replace the timing chain... If you've gone that far, you should make sure the cam and lifers are ok and replace if necessary. If you've had a "bottom end" event, you should probably replace the oil pump... now you have a new engine.

2006-08-06 15:22:34
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Q: How do you rebuild the bottom half of a 3800 motor for a Pontiac Bonneville?
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