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Where do the larger OD washers go? |
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JohnRyd 
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 Topic: Where do the larger OD washers go?Posted: Jan/29/2023 at 8:17am |
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I'm installing the exhaust manifolds (1968 4V 390) and replacing the old hardware.
The parts book calls for twelve 3/8-16 x 1 5/8 bolts, eight 13/32 ID, 13/16 OD, 1/8 thick washers and four 13/32 ID, 7/8 OD, 1/8 thick washers. Looked in the TSM and parts book illustration and can't find where the larger OD washers are used. I assume they are used at either ends of the manifolds, but don't know for sure. Don't know how much of a difference this makes, but there must be an engineering reason they used two different OD's. Anyone know for sure where the larger ones go?
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Adolph John Rydzewski
Newark, Delaware 1972 Ambassador 4dr Brougham, 360/2BBL/727 purchased new 1968 AMX 390/Auto 1957 Hudson Hollywood 327/Auto 1975 Cadillac Eldorado 1992 Lumina Z34 5 speed |
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mbwicz
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Posted: Jan/29/2023 at 1:00pm |
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Does the mating surface of the manifolds look the same for all 6 holes per side? I wonder if there were clearance issues on two ports that had them machine the slightly smaller OD?
Mike
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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BU1
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Posted: Jan/29/2023 at 1:08pm |
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Seems odd that AMC would do this. You are only talking about 1/32" per side on the washer.
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AMO #2726
#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642 #2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959 |
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mstrcrftr
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Posted: Jan/29/2023 at 1:53pm |
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the four are used on the ends of the manifold.
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73hornut
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Posted: Jan/29/2023 at 5:48pm |
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Would anyone know the difference, if they were all the same size?
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71 Javelin
74 Gremlin 79 Spirit AMX Rogue Valley Rumblers Like Us on FB https://www.facebook.com/groups/1602825606650796 |
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turbo
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Posted: Jan/29/2023 at 6:08pm |
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No amc judge will ever know the diff.........
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they call me Capt RETIRED!
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JohnRyd
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Posted: Jan/29/2023 at 8:13pm |
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Thanks for the replies.
I'm not building it for show, so from that aspect the sizes didn't make a difference. If AMC took the trouble to specify different sizes, was there a technical reason?? They even called out 1/8 inch thickness, which I understand in this application. Anyway, I'll put the four larger washers on the ends. FYI, they appear under group 1.067-9, parts 4001166 for the 13/16 OD and 4001104 for the 7/8 OD. Then again 4001104 shows up in group 17.814. For whatever reason 4001166 wasn't there. The abbreviation "SS" means "Supplied for Service", NOT Stainless Steel. Again, thanks for everyone's input! Much appreciated.
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Adolph John Rydzewski
Newark, Delaware 1972 Ambassador 4dr Brougham, 360/2BBL/727 purchased new 1968 AMX 390/Auto 1957 Hudson Hollywood 327/Auto 1975 Cadillac Eldorado 1992 Lumina Z34 5 speed |
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troutwilly
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Posted: Jan/29/2023 at 10:15pm |
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Is it possible that some washers were specific to where the heat riser was installed (passenger side exhaust manifold.)? Was there a heat shield on the driver side? Maybe a little larger diameter washer was used to better secure the metal riser/shield. Just my thoughts.
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Bill O.
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6PakBee
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Posted: Jan/29/2023 at 10:29pm |
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I just pulled a set of manifolds from a mid '70's 401 and all the washers were the same ID/OD and were only about 0.040 thick. This engine had the later bolts with the drilled centers.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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JohnRyd
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Posted: Jan/30/2023 at 6:42am |
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Once they went to the dog leg exhaust the washers were all the same size.
Heat shields are on both sides. They are held in place by the inner bolts. That may be the reason for the smaller washers, to compensate for the thickness of the heat shields. I thought about that as a possibility. Again, thanks for the input.
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Adolph John Rydzewski
Newark, Delaware 1972 Ambassador 4dr Brougham, 360/2BBL/727 purchased new 1968 AMX 390/Auto 1957 Hudson Hollywood 327/Auto 1975 Cadillac Eldorado 1992 Lumina Z34 5 speed |
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