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Author
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Topic: Engine sound
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FiveLiterDreamer
Journeyman Posts: 99
From: Conway, AR
Registered: Feb 2001
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posted 10-24-2001 10:14 PM
   
Well, i finally got my 302 built and installed about 5 wks ago. Been so busy with school starting up and crap, havn't had time to check out what's going on here. Its got about 1500 miles on it already from driving back and forth from school to home on the weekends. It looks f****g awesome sitting where that puny 4 cyl. sat. I've got it chromed out with braided hoses and nice attention to detail. Only problem is that about a wk. ago, it developed a small tak-tak-tak-tak sound. Its seems to be getting worse. For about the first 3 wks, I had a loud exhaust leak in the back of the heads that were suppose to be blocked off. I finally put bolts in the holes and then i was able to hear a slight tak-tak-tak sound. I thought it was the natural sound of the 302's timing chain. When i start my car and it hasn't warmed up yet, thats when its the loudest. After it warms, the sound isn't as noticeable. Its a rythmic sound that correlates with the engine speed. When the rpm increases, the sound speeds up, and disappears when the rpm is high enough. When i idle it down real far, the sound is louder. From what i can tell, its coming from the front of the engine. At first, i thought maybe a rod was knocking, so i pulled the spark plug wires of the cylinders towards the front of the engine, and it didn't change anything. I have no idea what this sound could be. If anyone has any thoughts, please help me out. Thanks for the input.
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John Holloway
Gearhead Posts: 686
From: Romeoville Illinois
Registered: Jul 2000
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posted 10-24-2001 10:43 PM
Sounds like a loose Lifter.
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mustangj
Gearhead Posts: 259
From: fergus,ontario,canada
Registered: Mar 2001
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posted 10-25-2001 10:45 PM
Does your 302 have forged pistons?
(there noisy until the car warms up)
What year is the engine? (does it have rail rockers or non rail.) Do the heads have the rockers bolted down or do they have studs and nuts? Most 302's have non-adjustable rocker arms, after an engine rebuild the rockers may have to be shimed or in my case a adustable rocker kit may have to be used. It may have a stuck lifter, or it may need a lash adjustment.------------------
1978 Muscletang II t-top mach 1
1991 Lincoln mark 7
1997 Escort wagon type R
[email protected]
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FiveLiterDreamer
Journeyman Posts: 99
From: Conway, AR
Registered: Feb 2001
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posted 10-26-2001 03:31 PM
No, they are cast aluminum. I used a '78 engine for parts in an '80 block. The rocker arms are non-adjustable. If it was a lifter or rocker arm, i would expect to hear the noise from the either the intake manifold or the valve cover. But they are not ticking. I used a trick i learned in vo-tech to listen around for the sound. I took a long screwdriver and used it as a stethoscope by pressing the handle against my ear and touching the end of it to various spots on the engine. it was loudest on the right side of the engine where the alternator sits. But, when i put my hand to the alternator i can feel that its not the thing making the sound. I'm thinking closer towards whats behind the timing chain cover. I just dont know what could be making that sound.....any thoughts??
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John Holloway
Gearhead Posts: 686
From: Romeoville Illinois
Registered: Jul 2000
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posted 10-26-2001 07:09 PM
What kind of Fuel Pump are you using,I've had mechanical Fuels go bad and sound like a Rod knock,if it is a mechanical pump loosen the bolts so the pump can be pulled out away from the timing cover about a inch or two after you have the car running if the noise goes away you know it was the pump!
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Gidyup302
Journeyman Posts: 93
From: CT
Registered: Feb 2001
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posted 10-28-2001 01:31 PM
What parts did you swap from 78 to 80?,your taking parts from different castings,thats a no no.Lifters make noise faster and slower
with rpm change,rocker adjust,bent push rod.
I would be a little unsure of the specs on those parts being swaped.different castings are a little different in spec,design
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FiveLiterDreamer
Journeyman Posts: 99
From: Conway, AR
Registered: Feb 2001
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posted 10-28-2001 07:23 PM
I told the machine shop what i was doing when i ordered the parts, he said that it wasn't any difference ordering between a '78 and a '80. I bought new lifters and pushrods for the '80 block and used the same non-adjustable rocker arms that came stock on the '78 heads.
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Gidyup302
Journeyman Posts: 93
From: CT
Registered: Feb 2001
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posted 10-28-2001 08:11 PM
the castings i think are the same,i would go after the lifters,rockers...
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