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Possible rod knock, video inside to help

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Old 02-22-2010, 08:26 AM
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Possible rod knock, video inside to help

I was out wheeling the other day, got stuck in a snow bank... and on the way home my 1990 4Runner 3vze sounded like this...

http://swimaway.net/runner/Memo.m4a


Does anyone have any ideas what that is? Valves?
Old 02-22-2010, 08:37 AM
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thats a heck of alot heavier than just a valve. any power loss? is that idling or driving?

oh and the mods are not gonna like the title of just HELP!!!!
Old 02-22-2010, 08:40 AM
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not any real power loss.... I drove it 15 miles home at 55mph. It's loud. That clip was taken at a stoplight then driving away.

I don't know how to change the title
Old 02-22-2010, 08:47 AM
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don't quote me on that but it really really sounds like a rod knock. Maybe its because its the 3vze but when i spun my rod bearing I was barely able to keep it at 5-10 mph without having it stall out and I have a manual trans. By the sound of the clip yours is an auto?
Old 02-22-2010, 08:48 AM
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I'll change the title.

Next time ill just delete it
Old 02-22-2010, 08:49 AM
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It's a manual. I mean, it drove just fine... .just loud as ****
Old 02-22-2010, 08:49 AM
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Did you pop the hood and see if anything it hitting any pulley or fan? x2 about the rod knock.
Old 02-22-2010, 09:00 AM
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hmmm I wonder if he bent the oil pan and its a rod hitting the pan? which would explain the sound of a rod knock without a power loss. I wouldn't drive it till you figure out what it is though.

Last edited by xxxtreme22r; 02-22-2010 at 09:02 AM.
Old 02-22-2010, 09:41 AM
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Well, I'm down to the cams... I started ripping it apart this morning. So far things look good unfortunately
Old 02-22-2010, 10:18 AM
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Originally Posted by xxxtreme22r
hmmm I wonder if he bent the oil pan and its a rod hitting the pan?
Doubt it. Remember the oil pick up is like 5 inches deep so thats a lot of bending lol.

I would start with the bottom end first, pull the diff, some steering links/ stabilizer and then the oil pan.
Old 02-22-2010, 02:17 PM
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not too familiar with the 3vz-e as I have the 22r, but I remember grounding out a 70 camaro and bending the oil pan but it bent it to where the flywheel was hitting so it bent the flywheel and took off a few teeth. But I guess that's what happens when you go 70mph on the road and get air born a little lol.
Old 02-22-2010, 02:30 PM
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that sounds like a spun rod bearing to me...
Old 02-22-2010, 09:54 PM
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I've done lots of top end work, but no bottom end work. How bad is it to replace a spun rod bearing? What machining will I be doing?
Old 02-22-2010, 10:01 PM
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that is excatly what my 3.0 sounded like when I spun a bearing. You can pull the pan with the motor in place and check. I did.

My bearing was eaten away to nothing on one of the rods. I needed to keep it on the road so i bought some aftermarket bearing and replace them all. It still knocked but much less and i drove it like that for another 5 months, albeit sparingly.

I changed them all with the motor in place from the bottom.

Then I pulled all that crap out and put in a 3.4 from a 97 Runner. Best decision I ever made was to not put another penny into that 3.0

Here is a link to my old thread asking for help on this as well.

Last edited by dntsdad; 02-22-2010 at 10:08 PM.
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