Rod knock at idle only???
#1159400
01/17/12 03:53 PM
01/17/12 03:53 PM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
OP
Banned. Forever.
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OP
Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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First let me give a rundown. My freshly rebuilt Magnum 318 is cursed. Standard rebuild parts replaced, rings, bearings, oil pump, timing set. When I first fired it up, there was a coolant leak at the rear of the intake that was contaminating the oil. Fixed that. Next, the oil pump locked up. Replaced it with a standard volume pump. Then I lost two lobes on the flat tappet cam that was in there, so I put the stock roller back in it. Now I have what sounds to be a bottom end knock at idle only. When built, I measured bearing clearance at .0015" on the rods, and .0015 on the mains. The original bearings looked great when removed. I'm running the same trans, converter and flexplate as the before. It only knocks under 1,000rpm. It has a little knock that's more pronounced at startup, but as it warms up, there's a steady "thump thump thump" that has the repetition of an exhaust leak, which leads me to believe its on one cylinder only. But 90% of the time its there, with no noise on decel, and no noise revving it up or at steady cruise. There is also a vibration above 3,500 or so. I'm am running a neutral balance converter though. Is it possible to have a rod bearing on its way out as a result of the oil pump locking up? When it happened, I had to idle for roughly 1/2 mile or so to get it out if harms way. But it runs great other than that. Any ideas??? It's not a big deal to drop the pan, but I figured I'd get some input from the masters first
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: Rod knock at idle only???
[Re: WO23Coronet]
#1159404
01/17/12 10:48 PM
01/17/12 10:48 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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As said pull the pan & go from there & hopefully R&R the bearings will restore it but I'm not optomistic on this one
live every 24 hour block of time like it's your last day on earth
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Re: Rod knock at idle only???
[Re: RapidRobert]
#1159405
01/17/12 10:59 PM
01/17/12 10:59 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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I had a chunk of casting flash break loose and get sucked up into the pump of my 360. Lost oil pressure and drove it home for probably 3 miles. New pump and pick up and I was good to go. I don't think a 1/2 mile drive would have wiped the bearings. Maybe some junk from the wiped cam made it past the pump and wiped the bearings?
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Rod knock at idle only???
[Re: 69L78Nova]
#1159407
01/18/12 01:17 AM
01/18/12 01:17 AM
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Joined: Oct 2008
Posts: 7 Sorrento, Florida. USA
scs2bbdak
member
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member
Joined: Oct 2008
Posts: 7
Sorrento, Florida. USA
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Before you pull it apart, try cranking it up and pull one plugwire off at a time. The knock should get a lot worse on the dead cyl. At least you'll know where to start. If they're tough to get at and get off the plug, do it when the engine's cold and one start at a time, until you find it. Chances are you wiped a rod bearing, but maybe a main too. Best of luck guy.
bye bye, buy Dodge!
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Re: Rod knock at idle only???
[Re: BigTerry]
#1159409
01/18/12 02:49 AM
01/18/12 02:49 AM
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Joined: Jan 2003
Posts: 1,490 smyrna,tn
draginmopars
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,490
smyrna,tn
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have you cut open the oil filter yet ?
Ha-Ha Racin Havin Fun 101
Howard
68 "Cummins" Satellite 70 W-2 449 "More Door" Dart 70 340 Dart Swinger, 4spd 71 360 Dart Swinger 72 540/ 518 Dart Swinger 73 airwolf 446/a-500 Cuda 73 "Cummins" Crew cab-car hauler 84 446 Dodge Rampage (tube chassis) 92 CTD 11' flat bed 92 CTD club cab 07 Dodge Caliber
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Re: Rod knock at idle only???
[Re: draginmopars]
#1159410
01/18/12 09:07 AM
01/18/12 09:07 AM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
OP
Banned. Forever.
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OP
Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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I haven't cut the filter open but the pan is coming off tonight. The knock is barely audible. You actually have to try to listen for it. It's not something that is just banging away. I just happen to notice it. Hopefully as said, there is no damage to the crank/rod
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: Rod knock at idle only???
[Re: scs2bbdak]
#1159412
01/18/12 11:32 AM
01/18/12 11:32 AM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
OP
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OP
Banned. Forever.
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Well I'm going to pull the pan first. It didn't start making the noise until the oil pump incident
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: Rod knock at idle only???
[Re: 69L78Nova]
#1159413
01/18/12 11:42 AM
01/18/12 11:42 AM
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Joined: May 2004
Posts: 1,522 Ste-Sophie, Quebec, Canada
Wedgeman
pro stock
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pro stock
Joined: May 2004
Posts: 1,522
Ste-Sophie, Quebec, Canada
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Take no chances and pull it apart (again!), you will find something wrong for sure.......
If you remove the pan AND oil pump, take the pump apart to see if chunks might have gone trough it, there will be visible marks inside
.015 is too tight, shoot for .020-.025 Dan
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Re: Rod knock at idle only???
[Re: 69L78Nova]
#1159414
01/18/12 11:44 AM
01/18/12 11:44 AM
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Joined: Jan 2003
Posts: 75,092 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
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Quote:
Well I'm going to pull the pan first. It didn't start making the noise until the oil pump incident
The pump incident is more than likely related to the camshaft lobes going flat , all that metal goes thru the pump before getting to the filter. This is why when you eat lobes off a cam you need to pull the engine out and apart , the piston skirts under the flat lobes can get pretty scarred up also .
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Re: Rod knock at idle only???
[Re: 69L78Nova]
#1159416
01/18/12 11:00 PM
01/18/12 11:00 PM
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Joined: Dec 2008
Posts: 2,782 USA
JoesMopar
master
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master
Joined: Dec 2008
Posts: 2,782
USA
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Before you pull anything off the engine, check to make sure the flex plate bolts are still tight. I had this happen a few times on a 440 and swore it was a rod knocking or something. Same as with you, it was more profound at idle and seemed to "go away" when reved.
Well I guess I should read these things the whole way through before I post. Nevermind then if you already found the problem.
Last edited by J5440; 01/18/12 11:03 PM.
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Re: Rod knock at idle only???
[Re: 69L78Nova]
#1159417
01/18/12 11:04 PM
01/18/12 11:04 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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One has to ask, how did it get past the filter? I hope you are changing that too.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Rod knock at idle only???
[Re: Supercuda]
#1159418
01/18/12 11:34 PM
01/18/12 11:34 PM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
OP
Banned. Forever.
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OP
Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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Absolutely. Oil and filter every time. I'm just surprised the crank looks unscathed. I'm just glad I caught it when I did.
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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