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Author
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Topic: Noisy 351W
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HHuggins
Gearhead Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001
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posted 01-17-2002 09:49 PM
   
Today the 351W in my '70 Mach I has started making a nice "clack-clack" sound after the engine warms up. The speed of the sound changes with the RPMs. I'm still learning what is what when it comes to these engines. Any ideas?HH ------------------
_ _____________________ _ Harley D. Huggins II
Laguna Niguel, CA 1970 Mach I
1998 GT Convertible
www.geocities.com/hh_machi/
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Fastback68
Gearhead Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 01-18-2002 12:31 AM
That could range from no big deal to something unmentionable! Where's it coming from? Under the valve covers? Inside the block???
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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 01-18-2002 04:22 AM
Does the sound seem to match you tackometer or half of the RPM? Which can tell you if its bottom end or top end. I put my hand on a valvecover and my stethoscope on my hand and can hear quite well the sounds underneath.------------------
'70 ragtop Stang
"I live my life 16.090 seconds at a time"
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Lennie
Journeyman Posts: 40
From: Denton, TX, USA
Registered: Dec 2001
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posted 01-18-2002 11:22 AM
I know this may sound like a dumb question, however; have you checked your oil level. It may just be that your oil level is sufficiantly low enough to starve the top end and your lifters are clacking (pretty technical term there). If the oil level is correct, I'd pull the valve covers and check the adjustments on all your lifter/valves. One may have come loose for some reason and you're hearing the pushrod slapping against the lifter/rocker arm and or rocker arm slapping the valve. If all that is good, then I'd have to assume that you have spun a bearing, either main or conrod. What do the rest of you think? Lennie
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SteveLaRiviere
Administrator Posts: 33988
From: Saco, Maine
Registered: May 99
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posted 01-18-2002 08:05 PM
Hard to diagnose a noise over the internet, but I'd use my stethoscope or put a screwdriver to my ear and try to pin down the sound. Then I'd pull the valve covers and check the adjustment of the rocker arms and using rocker clips {to prevent flying oil} put my hands on the rocker arms one at a time until I found the noisy one.Most likely it's a stuck lifter.
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HHuggins
Gearhead Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001
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posted 01-18-2002 10:15 PM
Thanks guys! It is coming from the valvecovers and I'm thinking that a lifter is sticking. I'm going to pull the cover off tomorrow and try to narrow it down.------------------
_ _____________________ _ Harley D. Huggins II
Laguna Niguel, CA 1970 Mach I
1998 GT Convertible
www.geocities.com/hh_machi/
IP: Logged |
thedave66
Gearhead Posts: 244
From: mountain home, idaho
Registered: Sep 2001
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posted 01-18-2002 10:43 PM
If it clicks for a while and then goes away as your motor warms up, check your oil. If you're running 10-40 or higher it's too thick when cold and it'll cause that noise. Switch to 5-30 or 10-30.dave
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HHuggins
Gearhead Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001
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posted 01-19-2002 01:52 AM
Actually, it's the opposite: the clicking starts when the engine warms up.HH ------------------
_ _____________________ _ Harley D. Huggins II
Laguna Niguel, CA 1970 Mach I
1998 GT Convertible
www.geocities.com/hh_machi/
IP: Logged |
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