Re: Thermostat housing bolts
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Forum Ambassador
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Are you sure about 3/8-14? Packard parts list says they are 3/8-16 and that's a very common bolt, available at my local hardware store in 1" length for about 75?. If that's too long for you, add another washer or grind a tad from the length.
Posted on: 2020/4/21 18:25
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Re: Thermostat housing bolts
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Forum Ambassador
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To the best of my knowledge there were no metric screws used as ordinary fasteners in a Packard. Parts manual says for the thermostat flange (except for the 22-23rd 356 engine) all engines from 48-54 used a 3/8-16 x 7/8 hex head bolt and a 3/8 lockwasher. That size should be easily found although the length may be a tad longer. If it absolutely needs 7/8 and you cannot shorten then McMaster-Carr carries 7/8 in various grades and metals but you will need to buy a box of them to get the 2 needed..
Posted on: 2020/4/21 18:30
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Howard
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Re: Thermostat housing bolts
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Home away from home
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Thanks. I looked again. I miss read the bolt gauge.
John
Posted on: 2020/4/21 18:35
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John Rhodes
1953 Packard Patrician |
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Re: Thermostat housing bolts
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Forum Ambassador
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If someone did a dirty trick and rethreaded a possibly damaged hole to metric then several hardware stores carry a small selection. I believe Lowe's and possibly Home Depot might also have a few. If no luck buying them locally then McMaster also carries metric sizes in various grades and materials but you would need to determine the size needed.
Posted on: 2020/4/21 18:41
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Howard
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Re: Thermostat housing bolts
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Home away from home
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John if you want to play it safe, go to the local hardware store and buy a few 3/8 - 16 one inch long bolts. Before you install the T-Stat goose neck, thread the two bolts into the head and run them down until you encounter significant resistance . . . but take it easy. Then try to slide the 'ears' of the housing under the hex heads. If you can't slide the housing under the heads that's good . . . you will have at least both the gasket and lock washer's thickness as margin. The plot thickens a bit if you can slide the housing ears under the hex heads . . . That's the minimum amount of material that must be removed either from the length of the bolt, or the thickness of 'extra' washers that must be added.
I suspect a lot of tolerance 'stack-up' went into the determination of the 7/8 inch both length. That is every head/housing combination would be leak free, and not jam the bolt into the bottom of the threaded hole. Your head/housing may easily accept bolts that are one inch long. dp
Posted on: 2020/4/21 18:59
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Re: Thermostat housing bolts
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Home away from home
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Thanks everyone. It doesn't seem like it was rethreaded. The old bolt wasn't super tight.
John
Posted on: 2020/4/21 19:07
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John Rhodes
1953 Packard Patrician |
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Re: Thermostat housing bolts
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Home away from home
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You should chase those threads before putting new bolts in.
Posted on: 2020/4/22 8:45
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Re: Thermostat housing bolts
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Home away from home
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Will do. Thanks
John
Posted on: 2020/4/22 9:49
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John Rhodes
1953 Packard Patrician |
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