[Solved] ARO Valve replacement fuse size and little repair. : MGB & GT Forum : The MG Experience

[Solved] ARO Valve replacement fuse size and little repair. #1 Solved
Watauga William B Richmond, IN, USA Sign in to contact 1974 MG MGB	Topic Creator (OP) Apr 15, 2024 04:04 PM Top Contributor Joined 2 years ago 234 Posts

Solved

I popped the fuse in my 1974 MGB ARO valve circuit, it had a 5 amp buss fuse in it, that seems like it could be a little low but my manuals and searches show the fuse location but no Amp rating for that fuse? The other inline fuses under the fuse box are 10 amp and that is what is listed for them. I put in another 5 Amp fuse and it's working fine for now.

Edited 3 time(s). Last edit at 2024-04-16 05:35 PM by Watauga.

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Re: ARO Valve replacement fuse size? #2
Watauga William B Richmond, IN, USA Sign in to contact 1974 MG MGB	Topic Creator (OP) Apr 16, 2024 12:21 PM Top Contributor Joined 2 years ago 234 Posts

Update, after replacing the fuse the ARO Valve was working but hit or miss, one of the posts on the ARO valve was bent so I figured it was a bad connection in the solenoid or windings someplace, so I took it apart and found the windings were good but the solder in the bent post holding the winding wire was cracked and not making a good connection, so I re soldered that and put it all back together, so far it works and passes the John Twist Evap ARO Tests.. and so it continues...

ARO Valve 1.jpg 54.2 KB

ARO Valve 2.jpg 34 KB

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ARO Valve 4.jpg 32.3 KB

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ARO Valve 8.jpg 51.9 KB

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Re: ARO Valve replacement fuse size? #3
bencii Ben Colpitts Eden Prairie, MN, USA Sign in to contact 1966 MG MGB 1973 MG MGB	Apr 16, 2024 12:24 PM Top Contributor Joined 13 years ago 3,062 Posts

Rick Ashley lists the ARO as 5 amp rating, but for 77 onward. I'm not sure why it's 77 onwards maybe someone else can provide some insight.

In reply to # 4785482 by Watauga I popped the fuse in my 1974 MGB ARO valve circuit, it had a 5 amp buss fuse in it, that seems like it could be a little low but my manuals and searches show the fuse location but no Amp rating for that fuse? The other inline fuses under the fuse box are 10 amp and that is what is listed for them. I put in another 5 Amp fuse and it's working fine for now.

Ben
1966 MGB Tourer
1973 MGB Tourer

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Re: ARO Valve replacement fuse size? #4
Watauga William B Richmond, IN, USA Sign in to contact 1974 MG MGB	Topic Creator (OP) Apr 16, 2024 12:28 PM Top Contributor Joined 2 years ago 234 Posts

ARO Valve pictures.

ARO Valve 3.jpg 30.3 KB

ARO Valve 6.jpg 38.8 KB

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ARO Valve 7.jpg 34.3 KB

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ARO Valve 9.jpg 41.5 KB

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Re: ARO Valve replacement fuse size? #5
Watauga William B Richmond, IN, USA Sign in to contact 1974 MG MGB	Topic Creator (OP) Apr 16, 2024 01:54 PM Top Contributor Joined 2 years ago 234 Posts

In reply to # 4785822 by bencii Rick Ashley lists the ARO as 5 amp rating, but for 77 onward. I'm not sure why it's 77 onwards maybe someone else can provide some insight.

In reply to # 4785482 by Watauga I popped the fuse in my 1974 MGB ARO valve circuit, it had a 5 amp buss fuse in it, that seems like it could be a little low but my manuals and searches show the fuse location but no Amp rating for that fuse? The other inline fuses under the fuse box are 10 amp and that is what is listed for them. I put in another 5 Amp fuse and it's working fine for now.

Thanks Ben, Moss is selling a ARO Valve part # 367-110 and they show it as a replacement part that works for MGB's from 1973 to 1980.
So the 5 amp fuse should work well enough. I do wonder why they only started listing the fuse amps for 77 onward?

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