Along with wrong size belts I believe there are a number of reasons why the
old GMC has belt hucking issues. In my opinion they are (in no specific
order by causation)
1.Cheap belts in the “correct” size and profile
2. Improper pulley size such when an alternator or power steering pump has
been replaced and it is supplied with the “wrong” drive pulley.
3. Pulley misalignment. The various accessories driven from the engine are
very specifically mounted to the engine and it’s pretty complicated and
quite easy to re assemble the various accessories and have them “work” but
not be correct. Multiple overlapping brackets and specific assembly order
lends itself to improper re assembly especially when coupled with poor
repair access and visibility. It is very difficult to see if all of the
pulleys are properly aligned with the radiator/fan shroud etc installed.
Often when the power steering pump is replaced the pulley needs to be
pulled from the old pump shaft and press positioned onto the pump arbor.
The PS pulley therefore needs to be properly aligned with the crank pulley.
Simply measuring the distance from the end of the original shaft may not
properly locate the pulley due to body housing differences, different shaft
length etc.
4. Missing “non essential” support bracketry such as the top alternator
support stay.
When I assembled the motor and it’s accessories I did it on the cradle with
the entire assembly out of the coach. This allowed me to check pulley
alignment where I could actually see and check with a straight edge.
Multiple bracket re location efforts were completed to end up with all of
the pulleys in the correct plane.
All of these issues when coupled with the disappearance of correct quality
belts is likely the driving force behind the desire for a simplified
serpentine belt system.
Sully
Bellevue wa.
On Thu, Jul 12, 2018 at 8:16 AM Emery Stora via Gmclist <
> Jon -
> Probably due to the brand of the belt and the tension.
>
> I have had a 100 amp alternator for over 20 years and I don’t have an
> squeal or belt life problem and I have the single groove pulley on the
> alternator.
>
> Someone with that problem should probably try an industrial belt. They
> are available in the sizes we need and are a much stronger and better
> gripping belt. I have not had to use them but I know some that have and
> they are very happy with them.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
> >
> > I am surprised that someone would want to go serpentine. Great that we
> have iotions.
> >
> > I also do not understand the bigger alternator in todays world. I just
> think in today's LED world,
> > It is easier to set your coach up to be more energy effecient then to
> find a way to produce more amps. Just seems more amps means more wear and
> less
> > life on components.
> >
> > I have a rebuilt stock alternator, and have never felt a need for any
> more amps.
> >
> > See many who have the 100 amp with no problems on a single pully, yet
> others cant keep a belt. Strange.
> > --
> > Jon Roche
> > 75 palm beach
> > St. Cloud, MN
> > http://lqqkatjon.blogspot.com/
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
old GMC has belt hucking issues. In my opinion they are (in no specific
order by causation)
1.Cheap belts in the “correct” size and profile
2. Improper pulley size such when an alternator or power steering pump has
been replaced and it is supplied with the “wrong” drive pulley.
3. Pulley misalignment. The various accessories driven from the engine are
very specifically mounted to the engine and it’s pretty complicated and
quite easy to re assemble the various accessories and have them “work” but
not be correct. Multiple overlapping brackets and specific assembly order
lends itself to improper re assembly especially when coupled with poor
repair access and visibility. It is very difficult to see if all of the
pulleys are properly aligned with the radiator/fan shroud etc installed.
Often when the power steering pump is replaced the pulley needs to be
pulled from the old pump shaft and press positioned onto the pump arbor.
The PS pulley therefore needs to be properly aligned with the crank pulley.
Simply measuring the distance from the end of the original shaft may not
properly locate the pulley due to body housing differences, different shaft
length etc.
4. Missing “non essential” support bracketry such as the top alternator
support stay.
When I assembled the motor and it’s accessories I did it on the cradle with
the entire assembly out of the coach. This allowed me to check pulley
alignment where I could actually see and check with a straight edge.
Multiple bracket re location efforts were completed to end up with all of
the pulleys in the correct plane.
All of these issues when coupled with the disappearance of correct quality
belts is likely the driving force behind the desire for a simplified
serpentine belt system.
Sully
Bellevue wa.
On Thu, Jul 12, 2018 at 8:16 AM Emery Stora via Gmclist <
> Jon -
> Probably due to the brand of the belt and the tension.
>
> I have had a 100 amp alternator for over 20 years and I don’t have an
> squeal or belt life problem and I have the single groove pulley on the
> alternator.
>
> Someone with that problem should probably try an industrial belt. They
> are available in the sizes we need and are a much stronger and better
> gripping belt. I have not had to use them but I know some that have and
> they are very happy with them.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
> >
> > I am surprised that someone would want to go serpentine. Great that we
> have iotions.
> >
> > I also do not understand the bigger alternator in todays world. I just
> think in today's LED world,
> > It is easier to set your coach up to be more energy effecient then to
> find a way to produce more amps. Just seems more amps means more wear and
> less
> > life on components.
> >
> > I have a rebuilt stock alternator, and have never felt a need for any
> more amps.
> >
> > See many who have the 100 amp with no problems on a single pully, yet
> others cant keep a belt. Strange.
> > --
> > Jon Roche
> > 75 palm beach
> > St. Cloud, MN
> > http://lqqkatjon.blogspot.com/
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
