Noise????
Thread Starter
Intermediate
Joined: Feb 2004
Posts: 45
Likes: 0
From: Bloomington IL
Noise????
I need HELP!! I have a 78 that I've done a good amount of work to the engine. The short block is stock, i've put in a new cam, timing chain, heads, intake manifold, carb, distributor, starting, torque convert, and powerglide.
Now there is a knocking coming from the front part of the engine. I first thought it was a lifter ticking or an exhaust leak at the headers, but then i had a friend help me listen and we determined it was coming from the front and if you put a screw driver on the water pump or on the timing chain cover it was really loud. It is not too noticeable at idle but when you give it gas it gets very noticeable. Anyway we figured the timing chain was loose so i took everything off to look at the timing chain and it is tight.
Any ideas to what it can be????
Now there is a knocking coming from the front part of the engine. I first thought it was a lifter ticking or an exhaust leak at the headers, but then i had a friend help me listen and we determined it was coming from the front and if you put a screw driver on the water pump or on the timing chain cover it was really loud. It is not too noticeable at idle but when you give it gas it gets very noticeable. Anyway we figured the timing chain was loose so i took everything off to look at the timing chain and it is tight.
Any ideas to what it can be????
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Could be any number of things. Check the outer ring of the balancer. Sometimes they come loose and end up crooked, hitting something as they turn.
Check the bolts holding the fan. If they are too long they hit the pump.
Check motor mounts. If they are torn the fan can hit the shroud.
Check the bolts holding the fan. If they are too long they hit the pump.
Check motor mounts. If they are torn the fan can hit the shroud.
Thread Starter
Intermediate
Joined: Feb 2004
Posts: 45
Likes: 0
From: Bloomington IL
I know it's not the motor mounts (they have been replaced), It's not the bolts for the fan, I found that problem when i first put it back together with new bolts 
. I checked the balancer and it's not that.
Can't say for sure if it is the fuel pump or not, any way to check that with out putting everything back together?
. I checked the balancer and it's not that. Can't say for sure if it is the fuel pump or not, any way to check that with out putting everything back together?
Pro
Joined: Sep 2004
Posts: 579
Likes: 0
From: North Texas
Originally Posted by mrherren
I need HELP!! I have a 78 that I've done a good amount of work to the engine. The short block is stock, i've put in a new cam, timing chain, heads, intake manifold, carb, distributor, starting, torque convert, and powerglide.
Any ideas to what it can be????
Any ideas to what it can be????
Thread Starter
Intermediate
Joined: Feb 2004
Posts: 45
Likes: 0
From: Bloomington IL
I should mention that I did the engine work 2 winters ago. I replaced the trans with a powerglide last summer and this year it was running fine and the noise just started during a small road trip (90 miles). The last thing i did to it was install a line lock kit.
The heads came preassembled and I did follow the instructions to breaking in the cam, as hard as that was to do.
The heads came preassembled and I did follow the instructions to breaking in the cam, as hard as that was to do.
Thread Starter
Intermediate
Joined: Feb 2004
Posts: 45
Likes: 0
From: Bloomington IL
Oh one more thing, it has progressively gotten worst. I started out as a small tick and turned into a very noticeable clunking. It has me very worried since I did spend, in my mind, quite a bit of money rebuilding it.
Melting Slicks
Joined: Oct 2001
Posts: 3,025
Likes: 12
From: Pleasant Grove AL
Originally Posted by mrherren
Oh one more thing, it has progressively gotten worst. I started out as a small tick and turned into a very noticeable clunking. It has me very worried since I did spend, in my mind, quite a bit of money rebuilding it.
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Race Director
Joined: Feb 2005
Posts: 16,100
Likes: 17
This may sound stupid,but check your pan.I dented one puting a 327 in a Chev truck once.Like to drove me nuts.Crank was hitting pan.....
Edit: Sorry,missed the "progressively" worse comment....
Edit: Sorry,missed the "progressively" worse comment....
Last edited by rihwoods; Jun 1, 2005 at 12:47 AM.
Advanced
Joined: Jun 2004
Posts: 93
Likes: 0
From: Southgate MI
Are you sure it's from the front? I had at one time a '76 vette with an automatic. Found out the noise was from one of the bolts which had backed out of the torque converter. It was banging around the bellhousing.
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Tom1701
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Tom1701