New engine start up ?
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Elder User
Joined: Oct 2004
Posts: 813
Likes: 1
From: Auburn, Il
New engine start up ?
Hey guys n gals, I've been trying to break in the new engine and yesturday I started hearing what sounds like a pretty good clunking sound almost like something is lose inside the engine. Lastnight and this morning I dropped the oil pan and checked the rods and bearing caps and they are tight, what could this sound be comming from? I did notice the oil is dark but I'm figuring that is from the motor not being in time correctly. She will fire right up and sounds pretty good so I have no idea what the noise could be.
New User
Joined: Aug 2010
Posts: 11
Likes: 0
did you crank the motor over with out coil wire hooked up to get oil pumping up in the heads and valve train...if the motor is a fresh rebuild or been sitting you should atleast poured some oil in each piston...hope this helps
Hotshot
Joined: Oct 2009
Posts: 16,188
Likes: 4,795
From: Burbank, WA
If you have a (or some) really long ratchet extensions, you can use them as a stethescope and isolate the noise, placing your ear on the top side while touching the extension on various parts and places around the engine, while it's running. (be vewy careful
) Strange knocking noises can come from alternators and especially fuel pumps that are failiing.
) Strange knocking noises can come from alternators and especially fuel pumps that are failiing.
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
Don't know what engine you got. But if it has big heads and cam than one valve spring needs to be removed during break in or most likely you will break the cam before it levels out. After about 50 miles of break in than replace the other valve spring. I can't remember an FE that had big valves and a big cam that this did not happen to.
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Elder User
Joined: Oct 2004
Posts: 813
Likes: 1
From: Auburn, Il
Its a 289 long block I got from autozone. I did crank it to get oil flowing through before I fired her up. I will try the stethescope thing to see if I can figure out where it might be coming from. When she first fires up I dont hear it but after I tap on the gas to get the slow idle is when I hear it so I'm stumpped...
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
HI Tard,
A suggestion and a question. First, the first time you started it up did you run it at 1100 rpm for 20 minutes to break in the cam?
Second, I'd take the valve covers off and check your valve spring retainer clips. I had one pop off and the valve was hanging slightly.
Check your transmission bolt up too!
A suggestion and a question. First, the first time you started it up did you run it at 1100 rpm for 20 minutes to break in the cam?
Second, I'd take the valve covers off and check your valve spring retainer clips. I had one pop off and the valve was hanging slightly.
Check your transmission bolt up too!
Thread Starter
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Elder User
Joined: Oct 2004
Posts: 813
Likes: 1
From: Auburn, Il
HI Tard,
A suggestion and a question. First, the first time you started it up did you run it at 1100 rpm for 20 minutes to break in the cam?
Second, I'd take the valve covers off and check your valve spring retainer clips. I had one pop off and the valve was hanging slightly.
Check your transmission bolt up too!
A suggestion and a question. First, the first time you started it up did you run it at 1100 rpm for 20 minutes to break in the cam?
Second, I'd take the valve covers off and check your valve spring retainer clips. I had one pop off and the valve was hanging slightly.
Check your transmission bolt up too!
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Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Let me rephrase that in the form of another question:
The first time you started up the engine did you perform the proper CAM BREAKIN PROCEDURE (it is normally for 20 minutes at a specific and constant rpm).
This doesn't sound like a scarred cam that but I'm just asking.
The sounds more to me like your flex plate torque converter or transmission housing may be a little loose. The engine itself is turning too fast to make a distinguishable thump!
Check the water pump and balance pulleys too!
Last question, does it do it all the time, just while moving, or just when stationary?
The first time you started up the engine did you perform the proper CAM BREAKIN PROCEDURE (it is normally for 20 minutes at a specific and constant rpm).
This doesn't sound like a scarred cam that but I'm just asking.
The sounds more to me like your flex plate torque converter or transmission housing may be a little loose. The engine itself is turning too fast to make a distinguishable thump!
Check the water pump and balance pulleys too!
Last question, does it do it all the time, just while moving, or just when stationary?
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Thread Starter
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Elder User
Joined: Oct 2004
Posts: 813
Likes: 1
From: Auburn, Il
Let me rephrase that in the form of another question:
The first time you started up the engine did you perform the proper CAM BREAKIN PROCEDURE (it is normally for 20 minutes at a specific and constant rpm).
This doesn't sound like a scarred cam that but I'm just asking.
The sounds more to me like your flex plate torque converter or transmission housing may be a little loose. The engine itself is turning too fast to make a distinguishable thump!
Check the water pump and balance pulleys too!
Last question, does it do it all the time, just while moving, or just when stationary?
The first time you started up the engine did you perform the proper CAM BREAKIN PROCEDURE (it is normally for 20 minutes at a specific and constant rpm).
This doesn't sound like a scarred cam that but I'm just asking.
The sounds more to me like your flex plate torque converter or transmission housing may be a little loose. The engine itself is turning too fast to make a distinguishable thump!
Check the water pump and balance pulleys too!
Last question, does it do it all the time, just while moving, or just when stationary?
Thread Starter
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Elder User
Joined: Oct 2004
Posts: 813
Likes: 1
From: Auburn, Il
Ok just got done looking over the heads, all the springs were in place everything was tight. Nothing looked out of place so my next move is to drop the tranny make sure the flexplate bolts are tight and go from there. I'm also going to get in touch with autozone and make sure the 28oz damper and flexplate are correct for this motor as far as I know it should be. The casting number on the block (C5AE-6015E) says its a 65 289 so they should be right...
Hotshot
Joined: Oct 2009
Posts: 16,188
Likes: 4,795
From: Burbank, WA
Before going to the drastic measures of dropping the trans, why don't you do as I suggested and investigate where the sound is coming from, first? It could save you a whole bunch of work and headaches. A bad fuel pump can sound just like a rod knock. My 2c.
Cargo Master
Joined: Apr 2007
Posts: 2,063
Likes: 38
From: Valley Center, California
When you described it as a "clunking" would that mean that it's a low pitched sound as compared to a "tapping" or a higher pitched knock or popping.
Does it idle smooth ? A Vacuum gauge will reveal a valve issue
Something else to try is to remove a spark plug from a cylinder one at a time. If the noise goes away or quiets down, that would point to a lower-end problem.
Does it idle smooth ? A Vacuum gauge will reveal a valve issue
Something else to try is to remove a spark plug from a cylinder one at a time. If the noise goes away or quiets down, that would point to a lower-end problem.
Cargo Master
Joined: Jun 2001
Posts: 2,571
Likes: 22
From: Oxford, Indiana
Hmmmm. Clunking that is first noticeable when it drops off of high idle. How frequent is this "clunk"? Is it rythmic like the pulses of the cylinders firing or is it just as the engine accels/decels? Or is it a random thing that just rattles or clunks at odd times for no apparent reason as the engine runs? If you've still got the oil pan off, I'd be checking the crankshaft thrust bearing. You shouldn't have any more than .004-.008" of crankshaft endplay. (Force the crankshaft back one direction with a screwdriver and measure at the thrust bearing with a feeler guage.) If the thrust bearing is wiped out, then you've most likely either got a bad torque converter or the converter was not properly and completely seated into the transmission. If that's the case, it's bad ju-ju for the tranny and converter as well. The only other thing that I can think of off of the top of my head is too much camshaft endplay. You'd have to tear the waterpump and timing cover off to check that, though.
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Hmmmmm, Does it sound at all like a thumping on the back of your head with the faint sound of a womans voice saying "Put it to bed for tonight and come in the house you idiot, it's two in the morning?" If so it's definately a bad boss bearing! 
Thread Starter
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Elder User
Joined: Oct 2004
Posts: 813
Likes: 1
From: Auburn, Il
Its really hard to describe the way it sounds, maybe if I take a small video of it you will be able to hear it. I'm hoping its comming from the flexplate because so far everything on the motor has checked out and tight so its the only thing I can think of. I hate those bad boss bearings, those can be a real pain to replace, but then again maybe it is time for a newer model...