 Head Exhaust Stud Question, what is the correct size? |
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| 76-914 |
 Jul 24 2010, 11:56 AM
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#1
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Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,648 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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First, I have a stripped hole where the exhaust stud threads into the head. It's a stock 75 2.0 . The PET manual shows #014 397 9, which is AM8 x 56 (what's the "AM" stand for?) qty "8"ea. It also lists #014 684 1, which is CM9 AX MB x 56 (what do "CM", "AX" and "MB" stand for?) qty "X"ea. ( X ???? ) Are there possibly two different diameter studs that were used on the 2.0? The AM 8 is 8mm, right? If so, is the CM9 a 9mm?
Secondly, is there any reason I should not drill and tap/heli coil the head in place from beneath the car. It's looks do-able as hell but thought I would ask here, first. Thx |
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| dr914@autoatlanta.com |
Jul 24 2010, 01:03 PM
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#2
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914 Guru Group: Members Posts: 8,111 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
QUOTE(76-914 @ Jul 24 2010, 10:56 AM)  First, I have a stripped hole where the exhaust stud threads into the head. It's a stock 75 2.0 . The PET manual shows #014 397 9, which is AM8 x 56 (what's the "AM" stand for?) qty "8"ea. It also lists #014 684 1, which is CM9 AX MB x 56 (what do "CM", "AX" and "MB" stand for?) qty "X"ea. ( X ???? ) Are there possibly two different diameter studs that were used on the 2.0? The AM 8 is 8mm, right? If so, is the CM9 a 9mm? Secondly, is there any reason I should not drill and tap/heli coil the head in place from beneath the car. It's looks do-able as hell but thought I would ask here, first. Thx I would certainly install a 9/8 mm stud first before tapping any more oversize. The 9mm (still 8 on the bottom) is a stud installed on the 1.8 models. If everything else fails you can install as large as a 10/8x56 stud. |
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| 76-914 |
Jul 24 2010, 02:56 PM
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#3
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,648 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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The current studs do step down in size. One end is 8mm x 1.25 and the other end must be 9mm because it's too loose in a 10mm die. However, I do have 2.0 heads so maybe they were changed out before?? Anyway, the old hole is pretty smooth and there are only 2-3 threads remaining. Anyone here sell the 10 x 8 56 stud that George mentioned or is it dealer item. Also, what is the correct number/letter drill bit for a 10mm tap?
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| avidfanjpl |
Jul 24 2010, 03:27 PM
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#4
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914 Hemophiliac Group: Members Posts: 720 Joined: 6-April 10 From: Bear, Delaware Member No.: 11,566 Region Association: MidAtlantic Region |
AA has the 10mm to 8mm stud in their catalog. I have seen them. He has 8X8 - 9X8 and 10X8. Download the pdf from their site to see them and call.
Check with AA on Monday before buying the right tap and heli coil. John |
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| underthetire |
Jul 24 2010, 04:59 PM
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#5
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
http://www.mcmaster.com/#step-studs/=83t12j
And you can get taps, drills, whatever else you need. I always get stuff in 24 hours from them. |
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