Old engines vs new

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Subject Author Date
Old engines vs new gary556 04-22-2006
Posted by on April 22, 2006, 5:12 pm
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 Why does an older enginr(class 8 diesel) vibrate more than
a new(newer) motor, same manufacturer?

i.e. what changes are happening as an engine ages/wears
that increases vibration/shake?

thanks
gary

Posted by RAM³ on April 22, 2006, 5:40 pm
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> Why does an older enginr(class 8 diesel) vibrate more than
> a new(newer) motor, same manufacturer?
>
> i.e. what changes are happening as an engine ages/wears
> that increases vibration/shake?
>
> thanks
> gary

Better motor mounts - and truck shock absorbers?

If nothing else, less wear on the rings and better valve adjustment.




Posted by Jordan on April 22, 2006, 7:41 pm
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>>i.e. what changes are happening as an engine ages/wears
>>that increases vibration/shake?

Ignition might be less effective on older engine (missing "bangs"
leading to more shakes)?
Something out of balance? I had a blade come off the fan at speed on a
truck once - the resulting vibration was astonishing.

Posted by Ignoramus8092 on April 22, 2006, 8:39 pm
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wrote:
> Why does an older enginr(class 8 diesel) vibrate more than
> a new(newer) motor, same manufacturer?
>
> i.e. what changes are happening as an engine ages/wears
> that increases vibration/shake?

I would first investigate everything that surrounds the engine, for
poor damping and resonance.

i


Posted by Mike on April 22, 2006, 10:28 pm
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Probably several things , like motor mounts, cab mounts and such. The fuel
injection system has a lot to do with it. With age the injectors and the
fuel pump wear. The cylinder balance changes and you have irregular fuel
outputs to each cylinder. New engines which are more stringent emission wise
are new and have more exact fuel outputs , thus a smoother engine.
Once had a new Mack exhibit right front tire imbalance. Replaced tire and
rotor. Nothing helped. Around 45 mph the truck would start vibrating. Pulled
injection pump and the fuel balance was off. The engine would rock in it's
mounts giving you the sensation the right tire was bad.



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