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Thermostat housing bolts

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Old 12-17-2013, 05:44 PM
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Default Thermostat housing bolts
What sizes are they in length and thread? The lower bolt broke off in the head.
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Old 12-17-2013, 06:03 PM
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Top one is 1 3/4 long, bottom is 3/4 long.
5/16-18 thread
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Old 12-17-2013, 06:06 PM
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Originally Posted by prcherokee
Top one is 1 3/4 long, bottom is 3/4 long.
5/16-18 thread
Can these be replaced with regular bolts and a washer?
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Old 12-17-2013, 06:08 PM
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Originally Posted by 1991Jeep_Man
Can these be replaced with regular bolts and a washer?
what do you mean by regular bolts?
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Old 12-17-2013, 06:23 PM
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So if I have at least half of an inch of the bottom bolt in my hand, not much is in there, right?
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Old 12-17-2013, 06:24 PM
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Originally Posted by prcherokee

what do you mean by regular bolts?
He means as opposed to irregular bolts, found next to the blinker fluid.
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Old 12-17-2013, 06:27 PM
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You can get the right length Grade 5 or grade 8 bolts at Lowes,
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Old 12-17-2013, 06:29 PM
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Is grade 8 that much more brittle? I don't want to get good at doing this...
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Old 12-17-2013, 06:33 PM
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https://www.tessco.com/yts/customers...bolt_grade.pdf
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Old 12-17-2013, 06:42 PM
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Holy crap, I never knew the marks had meanings. Cool bit of info. And I'll probably get grade 8. Lol
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Old 12-17-2013, 06:55 PM
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Someone once said that knowledge does not ends with a diploma, only with a death certificate.
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Old 12-17-2013, 07:04 PM
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Originally Posted by prcherokee
Someone once said that knowledge does not ends with a diploma, only with a death certificate.
I disagree. Only the dead guy knows if there is life after death or not, so truly you never stop learning.....
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Old 12-18-2013, 10:26 AM
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So safe to use non-flanged standard bolts with a regular washer or should you use a flanged bolt? Also, is grade 8 the best or should one go stainless?
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Old 12-18-2013, 12:14 PM
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I would just be careful using grade 8 as the housing is said to be farily easy to snap, and reviewing the construction of mine this weeekend, I would agree. Also, make sure you use some thread sealer on the top bolt unless you want to enter yourself in a wet t-shirt contest.
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Old 12-18-2013, 03:56 PM
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Originally Posted by 1991Jeep_Man
Can these be replaced with regular bolts and a washer?
Regular screw? Yes. Washer? Don't know if there's room.

I usually replace these with brass or bronze, CRES if I can't find either of those. I don't like using steel in water, if I have a choice.

(You can probably find brass, bronze, and CRES screws at the local marine supply house, definitely Fastenal, and probably any local MRO house.)

CRES = Corrosion RESistant alloy steel. "Stainless" is a trademark.
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