Thread size for manifold bolts/studs? - JeepForum.com

 
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post #1 of 5 Old 06-25-2013, 12:08 PM Thread Starter
sertshark
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1986 CJ7 
 
Join Date: Apr 2008
Location: oakdale
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Thread size for manifold bolts/studs?

It appears the thread size is different for the studs ( outside edges) and the bolts for the manifolds. Anyone know the sizes? I am thinking 3/8-16. But the studs on the end appear fine thread. The stud was stripped and I need to re-thread it. Thank you!!!


Year/Model: '86 CJ7 - Engine: 258 I-6 - Lift: Pro Comp 4" - Tires: 33X12.5 - Nuttered - Team Rush'd - Howell TBI
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post #2 of 5 Old 06-26-2013, 10:27 AM
SLO_Ken
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1986 CJ7 
 
Join Date: Nov 2009
Location: California
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Many times, studs will have a coarse thread on one end, and a fine thread on the other. For 3/8", the thread pitches would be 16 (coarse) and 24 (fine).

(these are carb mounting studs, but you get the idea.)
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post #3 of 5 Old 06-26-2013, 11:28 AM
LumpyGrits
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1985 CJ7 
 
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Location: The Mojave Desert - Palmdale, Ca. U.S.A.
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You might be able to retread to 5/16" dia, but that stripped stud will never hold a 3/8" dia nut again.
The thread that goes into the head is 3/8"X16thd N/C.
LG
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post #4 of 5 Old 06-26-2013, 12:13 PM
SLO_Ken
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Or you can get replacement studs. They're not too hard to find. I think I got mine at Ace Hardware.
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post #5 of 5 Old 06-26-2013, 01:51 PM
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson
Posts: 624
On my 78 304 I have 10 3/8-16 and 2 sae 7/16 on the #1 hole. Out of those 2 7/16, 1 of them was a stud 7/16 to the engine and 3/8 through the header. That was fun to find.
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