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I am wanting to replace the lower oil pan gasket and bolts (Qty.15). I used the GM parts manual to identify the bolt part number and it lists it as part number 11517509 which appears to have been superseded a couple times by 11517591, then by 11588714. I purchased the latest 11588714 but they measure 30mm in length and the original ones I took are measure 35mm. I can't seem to find the correct bolts to match my originals. Any thoughts or suggestions are appreciated.
I am wanting to replace the lower oil pan gasket and bolts (Qty.15). I used the GM parts manual to identify the bolt part number and it lists it as part number 11517509 which appears to have been superseded a couple times by 11517591, then by 11588714. I purchased the latest 11588714 but they measure 30mm in length and the original ones I took are measure 35mm. I can't seem to find the correct bolts to match my originals. Any thoughts or suggestions are appreciated.
Do you have sufficient thread engagement with the 30mm bolts?
With the 30mm bolts there is only about 1/4 inch or 5mm worth of threads that protrude through the pan, so the extra 5mm seems like it would be necessary. Also the original bolts have sort of a "flared collar" near the hex head which is seems to make them fit better into the bolt holes (see pic)
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With the 30mm bolts there is only about 1/4 inch or 5mm worth of threads that protrude through the pan, so the extra 5mm seems like it would be necessary. Also the original bolts have sort of a "flared collar" near the hex head which is seems to make them fit better into the bolt holes (see pic)
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So you are referencing the through holes on the wings, that there is an extra 5mm protruding.....which does nothing. You should be able to at least estimate the thread engagement into the upper pan, right?
Correct, so with the 30mm bolts that you referenced, only about 5mm would be engaging into the upper pan, which is 5mm less then the originals (50% less threads). This seems significant to me. There has to be another part number for the correct bolts
Correct, so with the 30mm bolts that you referenced, only about 5mm would be engaging into the upper pan, which is 5mm less then the originals (50% less threads). This seems significant to me. There has to be another part number for the correct bolts
Yep. Interesting. Even with the 35mm bolts it's still less that 2 x the diameter.
Correct, so with the 30mm bolts that you referenced, only about 5mm would be engaging into the upper pan, which is 5mm less then the originals (50% less threads). This seems significant to me. There has to be another part number for the correct bolts
Correct, so with the 30mm bolts that you referenced, only about 5mm would be engaging into the upper pan, which is 5mm less then the originals (50% less threads). This seems significant to me. There has to be another part number for the correct bolts
I was replacing the lower pan gasket on my C5 also, and a bolt broke off. Was going to replace all mine as well, what length did you end up going with?
I was replacing the lower pan gasket on my C5 also, and a bolt broke off. Was going to replace all mine as well, what length did you end up going with?
Don't wait for answer he's been off the forums since dec 5
I was replacing the lower pan gasket on my C5 also, and a bolt broke off. Was going to replace all mine as well, what length did you end up going with?
UPDATE... I went with M6x1x35 allen headed bolts and they are the same length as the stock bolts. Could definitely go M6x1x40 and be ok on the length.
2002 Lower Oil Pan Bolts
