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  how to tell an exhaust leak from valve/lifter clatter

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Author Topic:   how to tell an exhaust leak from valve/lifter clatter
project66
Gearhead

Posts: 246
From: Baton Rouge, LA
Registered: Jul 99

posted 08-21-2001 05:05 PM     Click Here to See the Profile for project66   Click Here to Email project66     Edit/Delete Message   Reply w/Quote
I hear clatter from one side of my engine. It's not particularly loud- couldn't hear it when the headers were open and is only audible at low (<1800) rpm. I readjusted the valves and it's still there. This is a new cam and lifters. New exhaust manifold gasket, too, and Blackjack headers.

Is there a trick to differentiating between exhaust and intake noise? Going to have the intake off tomorrow for a new gasket. Anything I can look for under there?

TIA and TTFN-
JimO

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 08-21-2001 06:57 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
On an exhaust leak, you can feel the air moving with your hands. On headers, you can sometimes see the soot marks.

------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!

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bluestreek
Gearhead

Posts: 1724
From: Athens,GA
Registered: Jul 2001

posted 08-21-2001 07:11 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
Also, exhaust leaks tend to have a "pop" or have a "ring" to them..
A good way to check for rocker ticking is to take stethoscope or long screwdriver and stick it to the valve cover and see if it gets louder..

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project66
Gearhead

Posts: 246
From: Baton Rouge, LA
Registered: Jul 99

posted 08-22-2001 12:17 PM     Click Here to See the Profile for project66   Click Here to Email project66     Edit/Delete Message   Reply w/Quote
OK- So, I'll check the exhaust gasket on that side for soot marks. I'd already attempted to isolate it with a screwdriver- couldn't tell where it was coming from but I never was real competent at that.

Next question is: what do I do if it the noise is coming from the valve train? Can I rotate the engine while the intake is off and hear/see a sticking lifter? What else could be causing this noise?

Appreciate your patience with the simple-minded questions, folks. I'm learning.

JimO

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Fastback68
Gearhead

Posts: 3053
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 08-22-2001 12:34 PM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
quote:
A good way to check for rocker ticking is to take stethoscope or long screwdriver and stick it to the valve cover and see if it gets louder.

This is also a trick I use whenever I buy a car. The seller is usually freaked out by my apparent expertise and stops b*ll****ting on the price!

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wythors
Gearhead

Posts: 2693
From: The cold, gray Pacific Northwest
Registered: Sep 2000

posted 08-22-2001 01:28 PM     Click Here to See the Profile for wythors   Click Here to Email wythors     Edit/Delete Message   Reply w/Quote
The easiest way that I've found to isolate an exhaust leak it to have about a 2-foot long piece of 3/8" hose. Stick one end in your ear and trace the other end around the exhaust ports and flanges. If there's a leak, you'll be able to hear it very clearly. This way you won't burn your fingers either.

------------------
Dave

1993 5.0 LX convertible.
Part-time driver of one badass black 96 Cobra.
MCA Member #47838
M&M Member #666
Life is GOOD!

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project66
Gearhead

Posts: 246
From: Baton Rouge, LA
Registered: Jul 99

posted 08-22-2001 01:56 PM     Click Here to See the Profile for project66   Click Here to Email project66     Edit/Delete Message   Reply w/Quote
Nice suggestions, thanks.

Gonna try the hose trick, Dave. That sounds excellent.

Appreciate the help-
JimO

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 08-22-2001 07:16 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Excellent idea, Dave.

------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!

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project66
Gearhead

Posts: 246
From: Baton Rouge, LA
Registered: Jul 99

posted 08-22-2001 08:39 PM     Click Here to See the Profile for project66   Click Here to Email project66     Edit/Delete Message   Reply w/Quote
Guarantee you that I'll find some way to burn my fingers though.

JimO

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steve'66
Gearhead

Posts: 8796
From: Sonoma,CA,USA
Registered: Mar 2000

posted 08-22-2001 08:45 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Jim,

Do it when the engine's cold.


SteveW

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JAAZZY
Gearhead

Posts: 776
From: Bay Area, CA
Registered: Apr 2001

posted 08-22-2001 09:29 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
Have a friend turn the crank really fast with a ratchet. That should keep you from burning your fingers.

quote:
Originally posted by steve'66:
Jim,

Do it when the engine's cold.


SteveW


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