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Thread: Connecting Rod Bolt Part Number?

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    Connecting Rod Bolt Part Number?

    Hello - I can go to the dealer if all else fails, but since dealer parts usually cost $$$, thought I would try here. I'm just looking for replacement connecting rod bolts, and can't find them for sale anywhere specifically for the Fiat 500. Tried actual mopar parts store website, fiatpartswebstore, ebay...nothing.

    Our 2012 500 Pop was making a lot of engine noise. Clutch engagement/disengagement didn't affect it. It was quiet for a few minutes on startup, then it would start making noise that followed engine speed. It didn't sound at all like the noisy sewing machine sound that the top end makes. I disconnected the fuel injectors one at a time, and the noise went away with the #1 cylinder disconnected. My wife also said that the low oil pressure warning came on twice. Both times she was in stop-and-go traffic and turned the engine off. When she restarted the engine, it cleared. No issues with oil level. I feel she's telling the truth and wouldn't continue running it...it was her baby. So, rod knock seems to make sense. I don't believe disconnecting a cylinder to stop the noise would work if it was a main bearing...could be wrong.

    I pulled the oil pan to look at the crank and connecting rods, but there was no noticeable play. No noticeable debris in the oil pan. The only thing I see is that the rod sits slightly off center relative to the piston while the other 3 seem to be pretty well centered. I haven't pulled the caps yet, so there is still a possibility that bearings don't look that great even if there is no noticeable play. Regardless, I'm going to replace the all rod bearings and put it back together. Pretty much anything else I would do related to chasing down the source of knocking would require much more disassembly than I'm capable of doing right now due to injury that's not going to get better anytime soon. I'm also going to plumb in a mechanical oil pressure gage while I'm underneath.

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    Fiat 500 Connecting Rod Bolt Part Number

    Welcome to the forum. Sorry to hear you are having an issue. The bolts are cheap from the dealer - about $6 each. I see 2 part numbers listed: 06509663AA and 68341067AA so you should confirm at the dealer.

    A suggestion is to always check the dealer first for a price and try to get a part number. This way you can see if it is worth going to the ends of the earth to find a particular item, plus if you get the part number, that will help your search. Also, 99% of the time the OEM parts are superior to aftermarket parts in fitment, function and longevity. You get what you pay for most of the time in this business. Good luck.
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    Boost Addict Lifetime Member opiateESP's Avatar
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    Quote Originally Posted by psubradster View Post
    Hello - I can go to the dealer if all else fails, but since dealer parts usually cost $$$, thought I would try here. I'm just looking for replacement connecting rod bolts, and can't find them for sale anywhere specifically for the Fiat 500. Tried actual mopar parts store website, fiatpartswebstore, ebay...nothing.

    Our 2012 500 Pop was making a lot of engine noise. Clutch engagement/disengagement didn't affect it. It was quiet for a few minutes on startup, then it would start making noise that followed engine speed. It didn't sound at all like the noisy sewing machine sound that the top end makes. I disconnected the fuel injectors one at a time, and the noise went away with the #1 cylinder disconnected. My wife also said that the low oil pressure warning came on twice. Both times she was in stop-and-go traffic and turned the engine off. When she restarted the engine, it cleared. No issues with oil level. I feel she's telling the truth and wouldn't continue running it...it was her baby. So, rod knock seems to make sense. I don't believe disconnecting a cylinder to stop the noise would work if it was a main bearing...could be wrong.

    I pulled the oil pan to look at the crank and connecting rods, but there was no noticeable play. No noticeable debris in the oil pan. The only thing I see is that the rod sits slightly off center relative to the piston while the other 3 seem to be pretty well centered. I haven't pulled the caps yet, so there is still a possibility that bearings don't look that great even if there is no noticeable play. Regardless, I'm going to replace the all rod bearings and put it back together. Pretty much anything else I would do related to chasing down the source of knocking would require much more disassembly than I'm capable of doing right now due to injury that's not going to get better anytime soon. I'm also going to plumb in a mechanical oil pressure gage while I'm underneath.
    Call up Tork. John found a replacement rod bolt that will be stronger and I reckon is cheaper than the OEM unit (if you can even get the rod bolt alone).
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    Lifetime Member texanbrit's Avatar
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    https://www.mymoparpart.com/p/42258875/06509663AA.html

    It's weird that fiatpartsweb doesn't seem to have it, but that site has not been as good since their redesign.

    Tork's cheaper and stronger sounds good to me though.
    2013 500c Abarth - phase 3
    2012 500 Pop - daily

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    Quote Originally Posted by psubradster View Post
    Our 2012 500 Pop was making a lot of engine noise. So, rod knock seems to make sense. I don't believe disconnecting a cylinder to stop the noise would work if it was a main bearing...could be wrong.

    I pulled the oil pan to look at the crank and connecting rods, but there was no noticeable play. No noticeable debris in the oil pan. The only thing I see is that the rod sits slightly off center relative to the piston while the other 3 seem to be pretty well centered. I haven't pulled the caps yet, so there is still a possibility that bearings don't look that great even if there is no noticeable play. Regardless, I'm going to replace the all rod bearings and put it back together. Pretty much anything else I would do related to chasing down the source of knocking would require much more disassembly than I'm capable of doing right now due to injury that's not going to get better anytime soon. I'm also going to plumb in a mechanical oil pressure gage while I'm underneath.
    If you spun a rod bearing, putting new bearing shells in won't fix the problem. It will tear up the new bearings and spin them again in a few miles of use. Assuming not too damaged with bluing of the journal, the crankshaft journal will need to be machined and larger bearings installed. Because low-mile engines for these cars are readily available from salvage places relatively cheap, I'd pull the rod cap and see if the bearing spun. If so, then I'd find a used engine and swap it out. You'll be money ahead.

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    I took off the cap for the bearing from the cylinder that made the noise go away when I unplugged the fuel injector. As mentioned, there was no play. Bearing and crank journal in absolutely pristine condition. I put a new bearing since I had it apart. No play indicating wrist pin issue. No play in any other rods, so I didn't bother taking any of them apart. Also, as mentioned, nothing in the oil pan. It's back together and still making the noise, as expected.

    I had planned on the redneck journal polish before installing new bearings (sandpaper, shoestring, WD-40) if they were bad to try to get another year or so out of the car. But, no rod bearing problems, rod journal on crank was flawless.

    Adapter for a mechanical gauge didn't work due to space constraints with the crank position sensor and I don't want to rig anything else up. So, just going to get a bluetooth adapter for the ODB2 port and some iPhone software to monitor oil pressure. If I don't have oil pressure issues, I'll assume it's not a main bearing issue and break down and go to the dealer for a diagnosis.

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