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Old 09-17-2011, 08:10 PM   #1
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Default Rod Knock? Bad Lifter?

I can't seem to tell the difference between the two.

Sounds like someone is taking a screw driver and tapping my canton oil pan, but it's not from the oil pan. Noise is more toward the top then bottom, and closer to the trans then the water pump.

Here is the background. 350 Lt1 motor, rebuilt with all new bearings, stock pistons rods and lifters. Everything else is different. During all of my test startups with open headers my oil psi was 60 or more.

heres the layout from cam out: cc306 to oem lifters to hardened trickflow pushrods to 1.6 RR. 918 beehives to ferrera valves.

I've been around knocking cars... its more of a clunking noise to me.
I have not been around a lifter sound tho.

Pulled the upper valvetrain, inspected everything under the valve covers all seems ok.

Pulled the intake and removed the lifters. Lifters dont show signs of physical damage to the surface, including the rollers. ONE (from cyl 4 driver side) Lifter had a little problem. The roller wasn't rolling... still no damage to the lifter, but could this be the noise problem...

I'm just trying to put my mind at ease... I would hate to dump more cash into it for another rebuild...
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Old 09-17-2011, 08:34 PM   #2
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O. I had my valve covers off for one night... the same night it rained... got a little milkshake. Drained the old oil and replaced.

also when I pulled the pan I did not see any metal chunks/particals...

I'm really hoping it was that lifter...
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Old 09-17-2011, 10:37 PM   #3
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A4 or M6? Almost sounds like a bent/cracked flexplate that you are describing.

A lifter can sound like knock as can a bad exhaust leak in the right spot.

60 pounds of oil pressure is a lot, but when the oil is cold its thick enough that it won't tell the true story unless its fully warmed up ~200*F.
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Old 09-17-2011, 10:51 PM   #4
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A4, flexplate is good spins on the starter without any movement front to back.

Just looked at the #7 exhaust lifter again... the roller doesn't roll at all.

I have a new set of lifters soaking as we speak.

I'm going to assume a bad rocker ajustment mixed with an oil/water oil (from that rainy day) destroyed this lifter... Car wasn't idling, it would start then die as if the rockers were too tight.
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Old 09-18-2011, 06:52 PM   #5
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welp, got a new set of lifters and installed them today. Great news... well... here you listen...


(still knocking lol) Barf.
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Old 09-18-2011, 09:05 PM   #6
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If you aren't getting any metal in the oil then I'd still go for the flexplate. You can't see it well enough when its bolted to the trans and if its cracked around the bolts or even bent from installing the trans it will knock.
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Old 09-18-2011, 11:52 PM   #7
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that sounds like rod knock to me
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Old 09-19-2011, 05:57 AM   #8
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seems like if its on start up and not even out on the street unless there was a huge mistake replacing bearings,I would lean more to the cracked or loose flexplate.
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Old 09-19-2011, 06:36 PM   #9
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Car hasn't been put into drive yet... Thats how new. Rotating assemb was done by a professional builder. Car sat a while but I primed the oil prior to starting it. Couldn't hear the knock at first but I just got the exhaust on and wammo knock was clear as day.

Flex plate was installed a month ago, before install it looked fine. I will re inspect it.

The more and more I watch the vid it seems that I have accepted that it's a rod.

No loss of power from the sound of it, and it's not that loud... Yet. Maybe thicker oil will quiet it down... If it does I know it's the bearing. Anyone know the weight of oil I should run to quiet a knock? It's got 10-30 conventional now...
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Old 09-19-2011, 08:17 PM   #10
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I listened to the video over and over, to me it sounds louder on the drivers rear valve cover. Have you tried starting the car with the driver side valve cover off of it. Are all the rockers oiling? It kinda sounds like more than one lifter. At this point whats to lose? Also you could ground out the spark one cyl. at a time which should quieten down a rod knock if it comes to that.
Good luck, maybe someone else will chime in.
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Old 09-19-2011, 08:29 PM   #11
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I just replaced all the lifters... 16 total exhaust lifter on 7cyl was all jammed up. Roller didn't roll. (driverside last lifter)

readjusted my rockers after installing the new lifters and still had the noise.
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Old 09-19-2011, 08:55 PM   #12
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Sounds like a flexplate. I had a similar sound. Ill look for the videp n post so u can compare.

Do u have stock flexplate?

Ur gonna have to remove the bolts off the TC to really examine ur flexplate. Look around where it bolts to the engine. It usually cracks around there. Use a flash light to really looks
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Old 09-19-2011, 09:00 PM   #13
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Old 09-20-2011, 06:27 PM   #14
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sounds like a rocker hitting the valve cover.....
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Old 09-21-2011, 12:21 AM   #15
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I plan to fiddle with the car tomorrow.

yes it is a stock flex plate, as for the rockers they are 1.6rr under canton valve covers. With the covers off the noise is still present.

I am starting to think piston slap maybe... its not a deep knock like a rod, least i don't think so. (trying to compair it to a rod knock i had on my pooper buick v6 years ago)

all new rings on the piston, and again the work on the block was done by a machine shop so I would assume that he didn't bore one cyl too much. Do the rings need time to seat?
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