What is making this noise?

[mferraro76]

http://www.youtube.com/watch?v=7mU-QToLXs4&feature=youtu.be

oil pressure is good, 40lbs at idle. thought it might be torque converter not installed properly on pump but not sure how to confirm. Starter, inspection cover all look ok. flex plate looks ok. put in gear and wheels turn.
appears to be coming from bellhousing area.

 

[moparmarks]

Sure sounds like flex plate/converter noise.

 

[mferraro76]

So I have the flex plate unbolted, TC turns, it sits inside the bellhousing about an inch. should it go further in?

any other ideas what could have made that noise?

 

[snakeoil24]

Sounds like something really running dry for sure. Walk around car with a 3 foot piece of wood hold one end to ear the other touch farious places on Motor and isolate it. It could be anything.

 

[Garys1969RR]

That noise search works well with a long screwdriver held to your ear. To me it sounds like the heads of the T/C bolts hitting the engine block. I had the same prob at one time.

 

[Pistol Pete]

That noise search works well with a long screwdriver held to your ear. To me it sounds like the heads of the T/C bolts hitting the engine block. I had the same prob at one time.

I had a similar problem on the other end. The lower crank pulley bolts were about 1/8" too long and were rubbing on the timing chain cover. Made one hell of a scary sound for sure.

 

[mferraro76]

Sounds like something really running dry for sure. Walk around car with a 3 foot piece of wood hold one end to ear the other touch farious places on Motor and isolate it. It could be anything.

only thought with running dry is maybe rocker shafts? I let it run for a few minutes, made sure oil pressure was up the whole time. but it worried me to let it run. doesn't sound like rod or main bearing noise.

other worries - something in the transmission? or windage tray (I triple checked this when assembling the motor).

To me it sounds like the heads of the T/C bolts hitting the engine block. I had the same prob at one time.

took those bolts out, no sign of them hitting

 

[D575]

I would check under those valve covers. :icon_frown:

 

[moparmarks]

Doesn't sound like a motor noise to me.
How about the flex plate to crank bolts? You used the shorter flex plate bolts and not the longer flywheel bolts, right?

 

[mferraro76]

Doesn't sound like a motor noise to me.
How about the flex plate to crank bolts? You used the shorter flex plate bolts and not the longer flywheel bolts, right?

I didn't mount the transmission. gave them the bolts that came out to reuse. even if they were too long, not sure what they would rub on since everything is turning.

 

[Meep-Meep]

Hard to tell what it is. Agreed it can be something external or I'd say even internal. 40 PSI of oil pressure doesn't seem that good to me, especially when the idle is probably at or near 1000 and the oil is most likely cold. Pretty much everything I have is nearly 80 PSI cold and 40 PSI at idle hot. If you don't find any external source for the noise I'd be investigating that lower end.

 

[Rich Kinsley]

Did this occur from the first start-up? The flex plate bolts can hit the dust shield and make a real clattering racket. I have seen an occasion where they loosened after awhile too. Use lock-tite on them. Also as mentioned the flex plate bolts are a thinner headed design for a lower profile to avoid this issue. It's pretty common to happen actually. The dust shield itself can also be slightly pushed in. You can be sure it's pulled away from the interior as much as possible.


Rich Kinsley

 

[mferraro76]

Hard to tell what it is. Agreed it can be something external or I'd say even internal. 40 PSI of oil pressure doesn't seem that good to me, especially when the idle is probably at or near 1000 and the oil is most likely cold. Pretty much everything I have is nearly 80 PSI cold and 40 PSI at idle hot. If you don't find any external source for the noise I'd be investigating that lower end.

~40 psi at 800 rpm, measured at orifice back by the distributor. it is your standard oil pump, not a "high pressure" pump, so I thought 40 was within spec. per the 1968 service manual, "minimum pump pressure at 500 rpm - 20 psi, operating pressure at 1000 rpm 45-65 psi." didn't attempt to rev and look at the gauge. Definitely looking at valve train this weekend, then might just pull the pan and check windage tray (not looking forward to that...)

I let it run thinking maybe the lifters need to pump up, or maybe it would just take time to get oil up to the rocker shafts - so I started it again later, ran it about 1500-2000 rpms for maybe 10-15 seconds, then let it idle for another minute or two - enough time to get coolant temps up into the 100's - but no change in the noise.

Did this occur from the first start-up? The flex plate bolts can hit the dust shield and make a real clattering racket. I have seen an occasion where they loosened after awhile too. Use lock-tite on them. Also as mentioned the flex plate bolts are a thinner headed design for a lower profile to avoid this issue. It's pretty common to happen actually. The dust shield itself can also be slightly pushed in. You can be sure it's pulled away from the interior as much as possible. Rich Kinsley

This happened at first start up. pulled flex plate bolts, there is no sign of damage. removed dust shield and again, no evidence of rubbing or damage. the bolts are brand new and came with the brand new B&M converter.

 

[mferraro76]

I would check under those valve covers. :icon_frown:

pulled them off today. looks like oil was getting up there, some oil still sitting in the rocker arms. none up on the back side of the valve covers, though. having had only run it for 2-3 minutes, at idle, should I have seen some splatter inside the valve covers (keep in mind I haven't started it since September)?

 

[khryslerkid]

Inside the valve covers would be drained off by now. Go ahead and start it with them off. See if each individual rocker has oil dripping off as it's running. Look and listen for anything else too. Do a visual inspection on all pushrod placements and the like before starting...

Good luck

 

[mferraro76]

any possibility this noise is from push rods that are 1/16th-1/8th too short? Or because I used non oiling push rods?