| Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326319 is a reply to message #326316] |
Fri, 24 November 2017 20:19   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Ken Henderson wrote on Fri, 24 November 2017 20:19I can't imagine anyone balancing a crankshaft with an external engine component, like a flex plate or harmonic balancer, or hub, attached. What if one of those requires replacement on an assembled engine? Disassemble
the engine to re-balance? Seems much more logical to me to balance each component individually. One might, in an especially critical application, then test their balance while assembled, but even then, if a system imbalance appeared, I'd want to find and correct the out-of-balance component.
JMHO,
Ken H.
Ken,
While it may be your opinion, can you imagine trying to balance the assembly and then disassemble it and build it back into an engine every 83 seconds? (That was speed of the line at Mound Road Engine when they were building the LA5.9 (360) there.
The fact is that they have balancing equipment that accommodates the external components and the bob weights that should be on the crank and do it all as a dynamic balance. If you have to replace a damper or a ring gear, you just have to hope that it was made with the correct imbalance.
Just a side note. Virtually all of the V-6s built in the US are externally balanced along with those the JimH just mentioned.
What a hoot? Get some jamoke to static balance a V-8 crank on knife edges and see if the engine stays under the hood when it get started. Balancing these parts is not a blacksmith job, it is much closer to rocket surgery.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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