Water pump bolts - JeepForum.com

 
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post #1 of 8 Old 10-23-2013, 10:41 PM Thread Starter
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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post #2 of 8 Old 10-24-2013, 08:57 AM Thread Starter
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post #3 of 8 Old 10-24-2013, 09:12 AM
jbolty
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They look like about 5/16 to me
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post #4 of 8 Old 10-24-2013, 09:49 AM Thread Starter
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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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post #5 of 8 Old 10-24-2013, 10:04 AM
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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.

Bill
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1988 Wrangler,4.2L I-6, Howell EFI JP-1,GM HEI Ign, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #6 of 8 Old 10-24-2013, 11:17 AM Thread Starter
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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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post #7 of 8 Old 10-24-2013, 11:29 AM
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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.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,GM HEI Ign, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #8 of 8 Old 10-24-2013, 11:56 AM Thread Starter
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Alright thanks for the help guys
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