Ratnose86SC

Would i notice right away if i spun a bearing. As im driveability and performance?

My car makes a god awful knocking sound and i didnt have the time to find track it down myself, so i took it to the dealer, and i hope its something stupid.

The only problem was the damn noise. Nothing else changed. Timing chain?

GMTech

A spun bearing makes a loud knocking noise, and when it siezes to the crank, it makes a really horrendus squealing noise as the bearing spins inside of the cap/journal. If the bearing is just shot, you can usually just put bearings or crank kit in. If the bearing has actually "spun", then usually its time for a short block.

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'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

RB83L69

Cracked flex plates make a horrendous knocking sound but affect little else (at least until they break clean in two!) If you have a spun bearing, you will almost always see a radical drop in oil pressure due to the massive internal leak from the pressurized system that the bearing clearance will create. If your oil pressure hasn't changed, and I mean not at all, then your bottom end is OK and the problem lies elsewhere.

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"So many Mustangs, so little time..."