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Help with balance shaft bearing failure?

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Old 07-23-2014, 05:51 PM
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Default Help with balance shaft bearing failure?

Okay very long story but ill cut it short, have a series 1 3800 supercharged, plenty of mods, had a 95 block in my 93, spun a main bearing, gutted my spare block and switched over the crank, rods, pistons etc. lasted maybe a week and my oil pressure switch failed and boom spun bearings

This time I got a 93 Park avenue ultra, heard it run, ran great had a little noise in the belts but the whole car was $400 with 114k

pulled motor, swapped my ported heads, etc regasketed the whole thing, got it in and running, had a clatter to it, replaced the cracked harmonic balancer and it helped, now theres a rattle under the throttle body and the whole engine shakes at idle, clatters bad at 1500 rpm, anything over that and it runs good.
Is this a bad balance shaft bearing? Ive had the engine out and in 3 times in the last 3 months and spent countless dollars on gaskets etc.
I do not want to pull it again if I dont have to
Has anyone experienced this before, and does the motor need to come out to replace the balance shaft bearings and or the whole shaft assembly
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Old 07-24-2014, 07:46 AM
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you check compression? look at the bearings? push on the lifters and see if any are loose?
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