1968 6cyl Noise after highway drive - Mustang Evolution

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Old 06-22-2011, 02:05 PM   #1
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1968 6cyl Noise after highway drive

Hey guys,

I was wondering if any of you could help me out with this noise that I keep hearing on my '68 (6cyl) after a long highway drive.

I'm not sure what it is, the engine is not particularly hot, it just makes this noise after a high rpm drive for about 5min and then sounds fine again.

Any thoughts?

i posted a link to the sounds clip so you can have a listen. It's called "memo" because i recorded it with my phone.

files.me.com/gdoyle05/jaunql.mov
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Old 06-23-2011, 02:27 AM   #2
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Does it do it at any other times or just after a high speed drive? It sounds like it's idling really high was that taken with the hood open cause that would explain the pitch. Might want to check timing for starters it doesn't hurt. Almost sounds like an exhaust leak but it's wierd how you said it's only after a high speed drive.
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Old 06-23-2011, 06:41 AM   #3
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Quote:
Originally Posted by Dmay65
Does it do it at any other times or just after a high speed drive? It sounds like it's idling really high was that taken with the hood open cause that would explain the pitch. Might want to check timing for starters it doesn't hurt. Almost sounds like an exhaust leak but it's wierd how you said it's only after a high speed drive.
Only after a high speed drive. I've never heard it before. And it usually doesn't idle at high rpm.

Yes the sound clip was taken with the hood open.

Is it an exhaust leak after the engine expands or something? Or motor mounts?
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Old 06-23-2011, 12:17 PM   #4
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It could be but it sounds more like a ping to me. Exhaust doesn't have the metal sound just air escaping. Unless the video is misleading
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Old 06-23-2011, 12:46 PM   #5
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It could be but it sounds more like a ping to me. Exhaust doesn't have the metal sound just air escaping. Unless the video is misleading
No it sounds exactly like that
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Old 06-23-2011, 12:49 PM   #6
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Yea the motor just sounds out of adjustment and needs tuning. You can give the timing a shot though. Try retarding the timing a little a it might help a smidge
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Old 06-28-2011, 06:49 PM   #7
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Sounds like the lifters rattling to me.
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Old 07-02-2011, 10:48 PM   #8
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What weight oil are you using? The lifters sound like they aren't getting proper lube. Oil old, level low??
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Old 07-03-2011, 08:02 AM   #9
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What weight oil are you using? The lifters sound like they aren't getting proper lube. Oil old, level low??
I forget the exact weight, my mechanic did put some thinner oil in I think. What would be the proper weight? my oil pressure seems a little low, but the oil level is fine.
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Old 07-03-2011, 01:04 PM   #10
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10w30 would be ideal.
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Old 07-07-2011, 08:59 AM   #11
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Yes sounds like lifter noise. You can change the oil again to start. Next, pull the valve cover and adjust the rockers. Both are very easy jobs.
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Old 07-07-2011, 10:37 AM   #12
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Originally Posted by Pony66
Yes sounds like lifter noise. You can change the oil again to start. Next, pull the valve cover and adjust the rockers. Both are very easy jobs.
I guess i assumed they were hydraulic so not adjustable. I agree if they are solid lifters then they should be adjusted but since it only rattles after a hwy drive that's why i sugested oil.
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Old 07-07-2011, 06:54 PM   #13
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Hydraulic lifters don't need adjustment like solid. But a lifter that has a little slack will slap making that sound. Also a rocker or rod not oiling properly won't pump up the lifter.
Rule of thumb is to loosen the rocker until it taps then tighten 1/4. Other is to loosen the rocker then move the rod as you tighten the rocker. Stop when the push rod cannot move up or down. Kinda obvious that the first way is with engine running and second is not.
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Old 07-08-2011, 09:24 PM   #14
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But this one is only making noise after a drive. I'm still thinking oil. Either lack of lifter oil, low oil pressure , etc.
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