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Re: Leigh Harrison Air Bag (Spring) part number

L
Larry
Thu, Sep 9, 2021 12:56 AM

The bigger Firestone bag that I am using is a 7659

https://www.truckandtrailer.parts/Genuine-Firestone-W01-358-7659-Air-Spring_p_65.html

HTH

Larry
78 Royale w/500 Caddy
Menomonie, WI.

The bigger Firestone bag that I am using is a 7659 https://www.truckandtrailer.parts/Genuine-Firestone-W01-358-7659-Air-Spring_p_65.html HTH -- Larry 78 Royale w/500 Caddy Menomonie, WI.
M
mark@royceadv.com
Thu, Sep 9, 2021 11:52 AM

Quote:

The bigger Firestone bag that I am using is a 7659

Just to be clear, you’re using that bag on a Harrison quad bag setup?

How much difference does it make in your ride Larry?

Any downside to switching to that bag from “stock”?
Did you have a failure that prompted adding the spacer bolts as reinforcement?
Any other modifications necessary?
Could you mix the sizes, as in could I keep a good old one onboard as an emergency spare?

Thanks in advance

Nearing the summit of Mount Stupid In my new 1975 Eleganza II

Quote: > The bigger Firestone bag that I am using is a 7659 Just to be clear, you’re using that bag on a Harrison quad bag setup? How much difference does it make in your ride Larry? Any downside to switching to that bag from “stock”? Did you have a failure that prompted adding the spacer bolts as reinforcement? Any other modifications necessary? Could you mix the sizes, as in could I keep a good old one onboard as an emergency spare? Thanks in advance -- Nearing the summit of Mount Stupid In my new 1975 Eleganza II
L
Larry
Thu, Sep 9, 2021 12:54 PM

MarkR wrote on Thu, 09 September 2021 06:52

Quote:

The bigger Firestone bag that I am using is a 7659

Just to be clear, you’re using that bag on a Harrison quad bag setup?

How much difference does it make in your ride Larry?

Any downside to switching to that bag from “stock”?
Did you have a failure that prompted adding the spacer bolts as reinforcement?
Any other modifications necessary?
Could you mix the sizes, as in could I keep a good old one onboard as an emergency spare?

Thanks in advance

The bags that you see in that were experimental and did not work out. They are from a company called "Airbagit". They are bigger than the stock
Harrison bags, and had all of the right fittings, fitting placement, and correct bolt pattern.  But the end plates are made of aluminum, and when put
under the stress of 100psi at fulll up and the slight twist, the aluminum cracked and leaked all of the air overnight. So, I had to go back to
Firestone bags. Right now I am running a mix of the two different sizes with the bigger bag on the rear of both sides. No difference in ride just
slightly lower pressures. My intent is to change the smaller bags out to the "slightly" larger bag the next time I have the coach up for other
maintenance. So, pay no attention to those bags in the pics. I do carry an old bag in case of a blow out, but that is unlikely.

As to the adding the spacer bolts, there have been several instances of.....under extreme stress, where the Harrison brackets have reportedly bent.
(VERY RARE) Some GMC'rs have modified the brackets adding extra support. Adding bolts like I did seemed like a simple, easy way of reinforcing them.
Adding them won't hurt anything and might help if I should inadvertently over stress things. Just my gut level solution is all.

Larry
78 Royale w/500 Caddy
Menomonie, WI.

MarkR wrote on Thu, 09 September 2021 06:52 > Quote: > > The bigger Firestone bag that I am using is a 7659 > > Just to be clear, you’re using that bag on a Harrison quad bag setup? > > How much difference does it make in your ride Larry? > > Any downside to switching to that bag from “stock”? > Did you have a failure that prompted adding the spacer bolts as reinforcement? > Any other modifications necessary? > Could you mix the sizes, as in could I keep a good old one onboard as an emergency spare? > > Thanks in advance The bags that you see in that were experimental and did not work out. They are from a company called "Airbagit". They are bigger than the stock Harrison bags, and had all of the right fittings, fitting placement, and correct bolt pattern. But the end plates are made of aluminum, and when put under the stress of 100psi at fulll up and the slight twist, the aluminum cracked and leaked all of the air overnight. So, I had to go back to Firestone bags. Right now I am running a mix of the two different sizes with the bigger bag on the rear of both sides. No difference in ride just slightly lower pressures. My intent is to change the smaller bags out to the "slightly" larger bag the next time I have the coach up for other maintenance. So, pay no attention to those bags in the pics. I do carry an old bag in case of a blow out, but that is unlikely. As to the adding the spacer bolts, there have been several instances of.....under extreme stress, where the Harrison brackets have reportedly bent. (VERY RARE) Some GMC'rs have modified the brackets adding extra support. Adding bolts like I did seemed like a simple, easy way of reinforcing them. Adding them won't hurt anything and might help if I should inadvertently over stress things. Just my gut level solution is all. -- Larry 78 Royale w/500 Caddy Menomonie, WI.