How long will a motor last with loose rod bolts?? - LS1TECH

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How long will a motor last with loose rod bolts??

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Old 01-29-2004, 07:57 PM   #1
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Default How long will a motor last with loose rod bolts??

I was just wondering what would happen if you had loose connecting rod bolts?? Would the bolts over time work their way out and through a rod out the oil pan?? Or would it just spin a bearing?? Would it just start to knock and through a code if it were just a bearing. Thanks
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Old 01-29-2004, 08:01 PM   #2
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I threw a rod out the side of the block on a 1st gen 350 because of a torque wrench that was 15lbs lite on it`s calibration. So yes you will probly throw a rod.
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Old 01-29-2004, 08:45 PM   #3
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Ouch that sucks!!!! Note to self: don't skimp when buying a TQ wrench.....Can you get to the rod bolts on a ls1 if you drop the pan???
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Old 01-29-2004, 08:56 PM   #4
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TTT on that ??
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Old 01-29-2004, 09:01 PM   #5
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Quote:
Originally Posted by AK's WS6
I was just wondering what would happen if you had loose connecting rod bolts?? Would the bolts over time work their way out and through a rod out the oil pan?? Or would it just spin a bearing?? Would it just start to knock and through a code if it were just a bearing. Thanks
Are you serious or is this a joke? ...Thats kinda like asking " I wonder what would happen if I only finger tightens my head bolts
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Old 01-29-2004, 09:21 PM   #6
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Ha ha, well I must admit I was kinda serious, I knew all hell would break loose, I just wondered how long it would last.....like say 5mi under light throttle or right on startup or 1 quick WOT blast???? The only way to find these things out is to ask, or try it......soooo I asked, you see!!!!
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Old 01-29-2004, 09:27 PM   #7
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I had about 300mi on mine when it let go. wasn`t even broke in yet. you should be able to get at the rods if you pull the pan but to do that you probly need to drop the cross member.
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Old 01-29-2004, 10:48 PM   #8
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I know a guy that replaced his pistons and rods by removing the crossmember from under the engine with the engine help up with a jack.

-Sly
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Old 01-30-2004, 02:27 AM   #9
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Just pull her back out to be sure. This isn't something you want to play with.

I can't see it living much past your driveway if you had a loose rod bolt.
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Old 01-30-2004, 03:20 AM   #10
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Lets see. 3 days or so on down time. A little pocket change for a oil pan gasket.
OR
New block $600-1000 after mechine shop
New rods and pistons after market $1300 or so stock once will cost under 500 used but what is the point
New heads $200 or so for stock once.
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Old 01-30-2004, 07:33 AM   #11
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Cost to drop the crossmember and correctly torque the rod bolts - $0
Cost to rebuild engine when rod bolt lets go (depending on damage)- $2,000-$5000
Fessing up to, and posting a thread about a boo-boo like this - priceless

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Old 01-30-2004, 11:09 AM   #12
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TIME BOMB!! Even if it let go at idle there will be a big mess.
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Old 01-30-2004, 11:16 AM   #13
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Hey Nick, good to see you back here!
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Old 01-30-2004, 11:25 AM   #14
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I had a small block 400 come apart at 6500rpm because of a loose rod bolt when I was in high school. Just like a bomb had went off in the motor. There was NOTHING salvageable. The cam was broke into 7 pieces! I wouldn't advise running it if there loose.
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Old 01-30-2004, 12:21 PM   #15
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Quote:
Originally Posted by Scott Turvey
Cost to drop the crossmember and correctly torque the rod bolts - $0
Cost to rebuild engine when rod bolt lets go (depending on damage)- $2,000-$5000
Fessing up to, and posting a thread about a boo-boo like this - priceless

...good one
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Old 01-30-2004, 06:01 PM   #16
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Ha Scott good one!!! You guys don't even want to know why I am pondering this question.........I just may be a very frusterated gent that is dealing with a horrible case of piston slap and Mr.Goodscrew won't fit the bill for what he fu#ked up and this particular gent who went out on a bit of a limb to afford his dream car don't want to eat the cost of a rebuild prolly not to far down the road!!!!
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Old 01-30-2004, 06:21 PM   #17
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389 Pontiac BB. Thought it was piston slap after hi-po rebuild. I was lucky, just cost $3,000 for a complete rebuild when the rod cap got twisted to a pretzel at idle. Don't even do it for 2 miles!
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Old 01-30-2004, 06:39 PM   #18
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Man it seems yall have had some nasty experiences reguarding this subject!!!! I just hope GM will fix the motor so that guy don't have a story like some of these.
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