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Author Topic:   Clank clank clank
posted June 05, 2004 08:02 AM
ok, I've got a weird low rpm sound coming out of my engine. It is a clanking sound, not neccessarily rockers like but not far from it. I hear it at idle and low rpm's. once we start up and go its gone. The engine pulls hard, it gives no sign of being down on power it just has this clanking going on. I do think the timing is off a bit. I'll verify that this week. Any idea's? Thought it might be a lifter or something top side. Maybe a spring.....really not sure, but we can hear the thing clank from the stands....its just not right. lol

posted June 05, 2004 12:42 PM
I had the same problem a few weeks ago, thought the motor was shot, ended up being a loose converter, ya might wanna give it a look.

posted June 05, 2004 12:46 PM
Cracked flywheel???

posted June 05, 2004 10:27 PM
We had a street car do something similar a few years ago. Turned out the side if the oil pain was bent just enough to touch the crankshaft.

Gas on it!

posted June 05, 2004 10:34 PM
Also had a bent inspection cover do it once, at higher RPM the flex plate never hit it as it straightened out. Just a thought, good luck.

posted June 06, 2004 05:18 PM
We had the same problem and come to find out it was the release barin....hope it helps...later

posted June 06, 2004 08:43 PM
Broke fuel pump spring?

posted June 06, 2004 08:45 PM
Not on the racer, but in my '90 Beretta 3.1 V6 5 speed I broke the springs in the clutch disc. At idle (800 rpm) or slightly below while slipping the clutch it sounded like a rod knock. Pulled the motor, ripped it apart and found nothing worn. Putting parts on the shelf and heard 'chink, chirp, rattle'.

Was almost sick that I tore the whole motor apart for an f'ing clutch disc. So I'll go with some in the flywheel-tranny area.

posted June 06, 2004 08:52 PM

Yeah, I was in the process of pulling my motor out b/c I thought it was a stretched rod. Did not even think to check the converter b/c it sounded just like a piston hitting the head. I had already ordered a new short block from jr motorsports and everything. Talk about felt like an *** when I climbed under there to take the crossmember out and the bolts were falling out the flywheel.

posted June 13, 2004 11:46 AM
So what was it.

Wind Walker
posted June 14, 2004 10:35 AM
Drain the oil & after it's finished, take your hand or a rubber mallot & hit the bottom of the oil pan. If you notice something banging around inside there, you'll find that the oil pump pick-up has fallen off. Thie usually makes a slight noise at low RPM, but goes away with throttle. You might notice a flux in the oil pressure as well (back & forth only a few pounds) during higher RPM's.

If that's the problem, you'll need to weld the new pick-up on, or either use a bolt-on pick up designed for your particular oil pan.

It does happen, and I noticed noone else mentioned it in the above replies. It only cost the price of an oil change, but it's better safe than sorry!

posted June 15, 2004 12:56 AM
Sorry I didnt get back to this post but for some reasonI couldnt find it here for a few days.

After further inspection it appears to be a leaky exhaust. I put new gaskets on the manifolds which quieted it down almost to nothing. I am going to put high temp silicone on the donuts and tighten those back up this week.

I'm sure glad it wasn't any of the issues you all listed above.....Thanks,

posted June 21, 2004 05:39 PM
My street stock was making the same type of noise 2-weeks ago. I am now building a new motor. That motor has a big hole blown threw the cylinder wall. I wish I ordered the short block then found the bolts falling out of the flywheel.

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