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Author Topic:   Noisy 351W
HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 01-17-2002 09:49 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
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

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_ _____________________ _

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

posted 01-18-2002 12:31 AM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
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

posted 01-18-2002 04:22 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
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.

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'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

posted 01-18-2002 11:22 AM     Click Here to See the Profile for Lennie   Click Here to Email Lennie     Edit/Delete Message   Reply w/Quote
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

posted 01-18-2002 08:05 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 01-18-2002 10:15 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
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.

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_ _____________________ _

Harley D. Huggins II
Laguna Niguel, CA

1970 Mach I
1998 GT Convertible
www.geocities.com/hh_machi/

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thedave66
Gearhead

Posts: 244
From: mountain home, idaho
Registered: Sep 2001

posted 01-18-2002 10:43 PM     Click Here to See the Profile for thedave66   Click Here to Email thedave66     Edit/Delete Message   Reply w/Quote
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

posted 01-19-2002 01:52 AM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
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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