Bearing cap bolts. -
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post #1 of 4 Old 03-29-2010, 03:10 PM Thread Starter
Genie 05
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Bearing cap bolts.

I'm replacing the rear main seal on my 81 CJ-7 and found 2 bolts and the broken off heads in the bottom of the oil pan. There was no other apparent damage so I don't know if the previous owner left them there as a present or what. The dealer said he needs a 707 or 352 # to order one. The only # on the head of the bolt is M 9. Anyone got any ideas as to which # goes with an 81, and maybe an alternate source for the bolts?

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post #2 of 4 Old 03-29-2010, 03:55 PM
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1) Have you checked all fourteen main bearing cap screws to see if any are missing heads? Got all fourteen screws in place? You didn't mention that.

2) Verify the threads on the screws - I'm almost willing to bet they're 1/2"-13. The 242ci (seven-main, two-bolt caps as well) uses what appear to be standard SAE8 capscrews for the main caps, and it has higher torque and power output figures. If SAE8 is good for that, it will be fine for your 258 (if, on the very off chance it's ISO, use ISO PC 10.9 or better.)

I'm inclined to think that the "M9" is a manufacturer's mark - is it in the centre of the head? Is there a series of "hash marks" around the head - one pointing to each corner? Add two to the count of "hash marks" - that's the SAE strength grade (six marks = SAE8. Three marks = SAE5. No marks = SAE2.)

If you get confused, submit a decent picture of the screw heads (not on a cellphone camera, unless that's really all you have and it takes a decent pic with good detail...) and we'll sort out you some more.

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post #3 of 4 Old 03-29-2010, 04:47 PM Thread Starter
Genie 05
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I checked all 14 and the 2 that were missing were the ones in the oil pan. The other 12 are in place. Sorry for the lack of info. I can't see how the heads could get sheared off and the rest of the bolt fell down in the pan. There are no marks on the bolt head other than the M 9. There are 15 threads on the bolt. I'll work on the picture. It may be difficult with my current system.
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post #4 of 4 Old 03-29-2010, 07:06 PM
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According to the 81-86 CJ7 parts manual, the part number is either J400 6591 if the bolt is 2.75" long or J400 6948 if the bolt is 2.87" long. My 83 has the 2.87" x 1/2"-13.
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