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Unread 10-23-2013, 10:41 PM   #1
bck4more
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Water pump bolts

Ok guys I really really need to know what size the water pump bolts are on the 4.2. Somewhere some how I've lost them during my rebuild. Thanks a ton

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Unread 10-24-2013, 08:57 AM   #2
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bump
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Unread 10-24-2013, 09:12 AM   #3
jbolty
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They look like about 5/16 to me
waterpump.jpg  
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Unread 10-24-2013, 09:49 AM   #4
bck4more
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I need to know what the lengths are because if i remember right there is 2 different sizes. Ive been googling my butt off and i just cant find them
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Unread 10-24-2013, 10:04 AM   #5
bpounds
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Shoot, I just bought some a couple of weeks ago, but I can't remember the lengths. I know they were SAE, not metric, and I agree 5/16-18. And yes, there are two lengths. In fact, my old pump used different combination of lengths than my replacement pump. So even if I remembered the lengths, it might not work right for you.

Can't you just measure the pump housing?

Don't lose your fan mounting studs. Those will be impossible to find around town. The bolts will be easy to find.
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Unread 10-24-2013, 11:17 AM   #6
bck4more
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Yeah i guess i can measure them i wonder how far they should go into the block
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Unread 10-24-2013, 11:29 AM   #7
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Quote:
Originally Posted by bck4more View Post
Yeah i guess i can measure them i wonder how far they should go into the block
You want a minimum thread engagement which is equal to the major diameter of the bolt. That's an SOP in industry. And you will be safe up to 1/2" of engagement. More than that and you might run out of threads in the block.
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Dodge did not build my Jeep.
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Unread 10-24-2013, 11:56 AM   #8
bck4more
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Alright thanks for the help guys
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