Harm-ful-ic Balance
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Harm-ful-ic Balance
The harmonic balance on my 86 E-150 302 apparently lost pitch, and wore a 3" slice through the aluminum timingchain coverplate, directly beside it.
While I've considered the notion, that the spline it spins on, is held remarkably in place by merely a rubber bushing, and if it failed, would most likely be the root cause, a different cuprit, stirs suspiciously in the back of my mind, as potentially poised, insideously undeterred, and ready to repeat the same offense.
About six weeks ago, I took the liberty of replacing the u-joints that had wore out along the length of the three piece driveshaft, that extends from the trans yoke to differential.
At the time, I was unaware of the need to mark the spline alignment, of where the three pieces of shaft connected, so that each piece would reconnect exactly how it was, prior to disconnect, and somthing I discovered later, could ultimately compromise the factory calibrated balance of the entire driveshaft.
The only factor seeming to dismerit such an imbalance as the cause, would be that it resides on the opposite side of the crankshaft.
Any thoughts?
While I've considered the notion, that the spline it spins on, is held remarkably in place by merely a rubber bushing, and if it failed, would most likely be the root cause, a different cuprit, stirs suspiciously in the back of my mind, as potentially poised, insideously undeterred, and ready to repeat the same offense.
About six weeks ago, I took the liberty of replacing the u-joints that had wore out along the length of the three piece driveshaft, that extends from the trans yoke to differential.
At the time, I was unaware of the need to mark the spline alignment, of where the three pieces of shaft connected, so that each piece would reconnect exactly how it was, prior to disconnect, and somthing I discovered later, could ultimately compromise the factory calibrated balance of the entire driveshaft.
The only factor seeming to dismerit such an imbalance as the cause, would be that it resides on the opposite side of the crankshaft.
Any thoughts?
Last edited by van_a_knockin; Jun 15, 2007 at 03:36 PM.
Fleet Mechanic
Joined: Sep 2003
Posts: 1,279
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From: savannah,ga
not sure of the conversation you seem to have going on there but here goes
the harmonic balancer is 2 heavy pieces of metal held together with a rubber bushing
this is so that the outer ring of metal will move independant of the inner
and smooth out the vibrations caused by the hit the crank takes
at the start of each power stroke. 4 power strokes for each revolution
without this simple but wonderful engineering marval the crank will
twist its self into in very short order. about 3 miles under heavy load.
yes it does come from experiance. 1978 ch##y c30 ambulance at about 90 mph
that old 454 wold run.
as for the drive shaft lay it on a flat surface and line up the flats of the u-joints
to reasemble
the harmonic balancer is 2 heavy pieces of metal held together with a rubber bushing
this is so that the outer ring of metal will move independant of the inner
and smooth out the vibrations caused by the hit the crank takes
at the start of each power stroke. 4 power strokes for each revolution
without this simple but wonderful engineering marval the crank will
twist its self into in very short order. about 3 miles under heavy load.
yes it does come from experiance. 1978 ch##y c30 ambulance at about 90 mph
that old 454 wold run.
as for the drive shaft lay it on a flat surface and line up the flats of the u-joints
to reasemble
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Ocurring in an ambulance, at 90 mph,
while carrying a patient??
That would be an experience, and then some.
So over time, these dampeners can just come apart?
For the drive shaft, pardon my ignorance, but what makes up the flats of the u-joints?
Thanks!
while carrying a patient??
That would be an experience, and then some.
So over time, these dampeners can just come apart?
For the drive shaft, pardon my ignorance, but what makes up the flats of the u-joints?
Thanks!
Last edited by van_a_knockin; Jun 15, 2007 at 06:31 PM.
Fleet Mechanic
Joined: Sep 2003
Posts: 1,279
Likes: 1
From: savannah,ga
no we were on the way to a patient when it happened
ended up in a sherriffs cruiser to get there
onto more important things
in the picture the flats are on the shaft its self just as pictured
lay the shaft with all the joints aligned the way your picture has them
ended up in a sherriffs cruiser to get there
onto more important things
in the picture the flats are on the shaft its self just as pictured
lay the shaft with all the joints aligned the way your picture has them
Fleet Mechanic
Joined: May 2005
Posts: 1,575
Likes: 11
From: Puyallup, WA
Originally Posted by mhg
no we were on the way to a patient when it happened
ended up in a sherriffs cruiser to get there
onto more important things
in the picture the flats are on the shaft its self just as pictured
lay the shaft with all the joints aligned the way your picture has them
ended up in a sherriffs cruiser to get there
onto more important things
in the picture the flats are on the shaft its self just as pictured
lay the shaft with all the joints aligned the way your picture has them
David
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