Rod knock?

4drcivic2k1 · 2005-09-11 09:20:28

http://www.gmmodernmuscle.com/fileupload/uploads/b1.jpg http://www.gmmodernmuscle.com/fileupload/uploads/b2.jpg http://www.gmmodernmuscle.com/fileupload/uploads/b3.jpg http://www.gmmodernmuscle.com/fileupload/uploads/b4.jpg So who can tell me what happened? :tup:

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Sep 11, 2005

4drcivic2k1

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4drcivic2k1 is an unknown quantity at this point

Rod knock?

So who can tell me what happened?

Sep 11, 2005

micks7thgen

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your engine was royally f****d thats what happened

Sep 11, 2005

4drcivic2k1

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Quote:

Originally Posted by micks7thgen

your engine was royally f****d thats what happened

Well that I know.

Can anybody explain WHY this happened?

Sep 11, 2005

micks7thgen

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a little back story would help what were you doing when this occured.

Sep 11, 2005

tinman

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Overheating the bearing, oil starvation.... So what led up to this?

Sep 11, 2005

C2i0v0i1C

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u pulled the bolts out damn!

Sep 11, 2005

SODJAZERO

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i just did the same thing on the engine i JUST replaced, i think its some sort of lubrication issue, and btw when i pulled the piston out the rod had no bearing left on it....

Sep 11, 2005

tfnaaf

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streched the rod bolts/cap and spun the bearing

Sep 11, 2005

cg95660

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It is definatly a spun bearing. Which can be caused by oiling issues or spinning the motor to high for the oil pump to suply oil. I wanna know what you did up to this point too!

Sep 11, 2005

#10

streetglower

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Quote:

Originally Posted by tfnaaf

streched the rod bolts/cap and spun the bearing

I am no expert on this, but please explain why that causes this or how it caused it. Usually I thought that this was caused by not enough clearance in the bearing to crank causing a lack of lubrication.

Sep 11, 2005

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ncirom2003

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spun bearing it seams.

Sep 11, 2005

#12

tfnaaf

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Quote:

Originally Posted by streetglower

Just going off what i can see in the pciture it appears that the bearing spun inside the cap. This is usually caused from stress to the rod/bolts causing them to stretch then the bearing spins inside the rod. Its possible there was an oil starvation issue but its a little hard to say for sure

Sep 11, 2005

#13

streetglower

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Quote:

Originally Posted by tfnaaf

what usually causes that stress?

Sep 11, 2005

#14

ncirom2003

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hmmmm, im thinking of possible causes, first thought is detonation trying to push the piston down before tdc and in turn hesitating the crankshaft putting stress on another pistons connecting rod in an opposite direction opening a clearance and spinning the bearing when it closes again. however i dont think this is it lol

Sep 11, 2005

#15

Rufus

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HAHA I did the same thing... I need to post pics as well

Sep 11, 2005

#16

4drcivic2k1

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The bearing cap didn't stretch. The bearing is elongated because i had to pry it off the rod journal on the crankshaft. As of now it looks like an oil pump failure is to blame. The engine is a completely stock D17A2 with about 60k miles on it. The bearing did indeed spin inside the rod hence the off-setness of it.