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  Help! Maybe I'm in denial...rod knock

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Author Topic:   Help! Maybe I'm in denial...rod knock
Calcat
Journeyman

Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 12-09-2002 02:03 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
The 302 was purring like a kitten. Parked and went to start it up the next day. Knock knock, increases with engine rpm. I realize that it could just be coincidence but it is hard for me to accept that I start it up and this happens. Oil level and pressure was fine.
Ruled out lifters and cam, just replaced. Anything else I can look at before I get into acceptance and tear this puppy down?

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SteveLaRiviere
Administrator

Posts: 34763
From: Saco, Maine
Registered: May 99

posted 12-09-2002 08:14 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
You hear a rod knock as the engine decelerates, it doesn't go up and down. What you describe sounds like a valvetrain problem.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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V8 Thumper
Gearhead

Posts: 3603
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 12-09-2002 08:42 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Ditto on the valvetrain...

You say cam & lifters are new? Pull both valve covers off and check each rocker arm in firing order sequence as if you were adjusting them. Look for a loose one, note wether or not the rocker stud nut backed off or not, then post the results here

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

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Calcat
Journeyman

Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 12-10-2002 01:30 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
I'll go through the cycle and check all the valves. Do you think it is also possible a valve is hanging and the sound I hear is the piston pounding it closed again (ouch)?

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V8 Thumper
Gearhead

Posts: 3603
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 12-10-2002 08:49 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Let's hope not, but first things first. Check the valvetrain, start with the simple stuff. If you can't find anything wrong up top, then we'll look further into it

What cam/lifters did you just install, and did you follow the manufacturer's break-in procedure?

------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

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