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Unread 10-11-2009, 03:14 PM   #1
amgqmp1
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What size bolt for the lower thermostat housing?

I've just spent five hours running to the hardware store and back trying to get a usable replacement for the lower thermostat housing bolt. I have lost mine.

Anyone know what size the bolt is and/or where I can buy one from?

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Unread 10-11-2009, 06:14 PM   #2
Team Beater
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why dont you take the one from the top with you to compare?
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Unread 10-11-2009, 06:34 PM   #3
XJMuscle98
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I want to say 2" but I'm not sure.

I know its 13mm
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1998 Jeep Cherokee 4.0L AW4/NP231 211k+

"Approximately 80 percent of our air pollution stems from hydrocarbons released by vegetation, so let's not go overboard in setting and enforcing tough emission standards from man-made sources."
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My goal is to have 20 lights around my XJ.

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Unread 10-11-2009, 07:27 PM   #4
amgqmp1
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Thanks to both of you! I'm going to head over to NAPA tomorrow with the top bolt (the thread is a match, the size of the bolt is not). I need a fresh gasket anyhow after my many hours of wrenching trying to get bolts that thread, but do not tighten, to work.
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Unread 10-11-2009, 09:00 PM   #5
cobra
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one is long and one is short.. not the same length
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Unread 10-12-2009, 04:11 AM   #6
XJMuscle98
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Quote:
Originally Posted by cobra View Post
one is long and one is short.. not the same length
thanks. he wants the bottom which is short
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1998 Jeep Cherokee 4.0L AW4/NP231 211k+

"Approximately 80 percent of our air pollution stems from hydrocarbons released by vegetation, so let's not go overboard in setting and enforcing tough emission standards from man-made sources."
Ronald Reagan

My goal is to have 20 lights around my XJ.

Currently: 10
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Unread 10-12-2009, 09:19 AM   #7
amgqmp1
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Thanks for the replies! If I can get a usable replacement at the auto parts store today, I'll post the size of the bolt I purchased to help with future searches.
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Unread 10-12-2009, 01:12 PM   #8
amgqmp1
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5/16" x 1 3/4" (Coarse Thread) looks like a proper replacement. I assume a 2" long would normally work too. Sadly, I'm passing from normal into riggin' it up time. I'll start a new thread about my idea to JB weld the housing on...
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Unread 06-03-2010, 04:19 PM   #9
SKI-SKI-SKI
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Any chance you know the length of the upper bolt? I broke it and have been drilling on it for DAYS!!!
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Unread 06-03-2010, 08:06 PM   #10
amgqmp1
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Quote:
Originally Posted by SKI-SKI-SKI View Post
Any chance you know the length of the upper bolt? I broke it and have been drilling on it for DAYS!!!
I don't recall the exact length of the top bolt, but it's much longer than the bottom bolt. My best guess is that it's a 3.5" long bolt (with thread only on the top 1.25").

I ended up having a guy put a helicoil in after my bottom bolt incident. It held all winter, and is still going strong. It should be much easier with the top bolt, although you are already experiencing that it's a lot of bolt to remove.

The moral of the story is that your hard work will pay off.
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Unread 07-31-2010, 08:10 PM   #11
y2kxj
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5/16-18 thread
Top one is 1 3/4 long, bottom is 3/4 long
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