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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 12-09-2012, 04:14 AM   #1 (permalink)
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bolting carbs to manifold question...

i'm putting new gaskets and o-rings on my carbs and re-mounting them. the previous owner had just a bolt (no washers) and those self tightening nuts (with nylon inserts).....i'm sure that helps prevent vibration from loosening the bolts over time. is this what was originally used on the carbs? i've heard that i only want about 7 lbs of torque on these bolts to prevent binding or warpage on flange (and possible slide problems. the problem is that these self tightening nuts screw on hard and it's difficult to tell when you have "bottomed out", and just how tight they really are...i'm curious about what you guys use on the carb mounting bolts and nuts, and the procedure. thanks, Rick
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Old 12-09-2012, 05:41 AM   #2 (permalink)
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You have the screw-in manifold.
The bolts [F2603] have two plain washers [S25-3] each, nuts [T234].
Gasket [NA43A], Insulating block [E2968] and the O-ring [244/1048].

Do not overtighten.
http://www.scribd.com/doc/55885440/1...-Parts-Catalog
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Old 12-09-2012, 02:21 PM   #3 (permalink)
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A great tip from GABMA is to use a split lock washer and tighten just until the washer collapses. Hope that makes sense.

td
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Old 12-09-2012, 03:07 PM   #4 (permalink)
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ok, thanks.....but the self tightening or self locking nuts are the way to go right???
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Old 12-09-2012, 03:48 PM   #5 (permalink)
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This is a picture of my set-up. (`74 T120V)
This is apparently from `69 on.
Your manifold is different to this.
But its not shown in my `72 or `73 spares books.
[it must be in the `74 T140 book which is in the workshop]
The cup is 70-9555 and the rubber insulator is 70-9554.
This is a far better method of fixing the carbs...you dont need to crush the rubbers much.
The nuts are 1/4 UNF`stiff nuts` I think.
The gap between the manifold and carb flange is due to the `thick` O-ring.
I imagine you could use the cups and rubbers...not sure about the O-ring or nut.
Your nuts may be a different thread???

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Old 12-09-2012, 04:59 PM   #6 (permalink)
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thanks Caulky for the pic......that's the type of nuts that i'm using, just worried about over tightening. i do have two different o-rings that i can use on these new 930 amals, but the thick one doesnt' seem to "seat" into the carb groove (too thick), so i guess i will use the thinner ones. the split washer method might be my best bet to determine torque on the carb flange....Rick
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Old 12-09-2012, 10:16 PM   #7 (permalink)
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Carb Mounting

Use the thicker one and hold it in place with grease while fitting. Tighten it to the gap seen in the picture posted above. Does not need to be that tight. This will insulate from heat and vibration.

My .02 cents
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