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engine knock
Thread Starter
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Freshman User
Joined: Aug 2006
Posts: 32
Likes: 0
engine knock
hello
i have a '66 ford f100 packed with a 352 cui and three on the tree.
it sat for 1½ year but started right up.
when driving i hear a rattle (knock) in the engine.
when accelarating i don't hear it (but it could be there)
i hear it only when you drive a constant speed.
do you guy's know what this is?
is it a pushrod stuck?
could it cause damage to thye engine?
lets hear!
thanks
i have a '66 ford f100 packed with a 352 cui and three on the tree.
it sat for 1½ year but started right up.
when driving i hear a rattle (knock) in the engine.
when accelarating i don't hear it (but it could be there)
i hear it only when you drive a constant speed.
do you guy's know what this is?
is it a pushrod stuck?
could it cause damage to thye engine?
lets hear!
thanks
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
How many miles on the ol boy? The FEs will wear a rod bushings and it will clack clack clack when it is running. That usually is heard an any rpm.
That is just one posibility.
John
That is just one posibility.
John
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
Based on the sat for 1.5 years, I'll guess the sediment on the lifters, cam, rockers, valves etc... has turned to a nasty glue and causing some binding. Stuck lifter is a likely cause..but I cant hear it so ?? (Wrist pin, rod, stuck valve, etc...) I'd probabl start with remove the valve covers and watch the pushrods.. are they all rotating? any have an inconsistant return ? You tell us what you see, we'll help you find the define cancer!! For what its worth, setting that long might be worth removing cleaning lifters. keep them and everything else in order of origination if you do this. One simple slip up on lifter address and ewhhh cause it's really 2 and double ewhhh!!
Elder User
Joined: Feb 2006
Posts: 788
Likes: 0
From: Cascade, ID
My new to me 390 makes a similar noise, but if I unhook the vacuum advance it goes away. I have tried retarding the timing, but it becomes hard to start. I may have a distributor built for it after I install headers and a 4bbl.
Elder User
Joined: Feb 2006
Posts: 788
Likes: 0
From: Cascade, ID
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Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Originally Posted by scottfreeman
What do you mean?
My wild guess is the fuel pump: The follower spring went kaput letting the pump arm slap the cam. Second wild guess would be an exhaust leak he can't hear over the engine.
Time to play detective and gather more information.
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Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Zactly! It's like saying "I have an oil spot under my car, where is it coming from?" You can't even say it's from that particular car with that information.
I don't mean to be harsh. I apologize in advance if I come off that way. Many of these threads have less to do with the problem and more to do with diagnosing it.
Scott, you asked the question, and yes, I do have a few cars like that.
5t6, get the truck warm, pop the hood and see if you can reproduce the sound in the driveway. If it does it only under load we have a clue. I'm sorta guessing you will be able to hear it in the driveway and be able to determine a location for the sound.
Keep us posted.
I don't mean to be harsh. I apologize in advance if I come off that way. Many of these threads have less to do with the problem and more to do with diagnosing it.
Scott, you asked the question, and yes, I do have a few cars like that.
5t6, get the truck warm, pop the hood and see if you can reproduce the sound in the driveway. If it does it only under load we have a clue. I'm sorta guessing you will be able to hear it in the driveway and be able to determine a location for the sound.
Keep us posted.
Thread Starter
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Freshman User
Joined: Aug 2006
Posts: 32
Likes: 0
thanks guys.
engine was rebuild in '04 and aproxamatly 10000 mls.
drove the truck for about 2 hours but the noise stays.
the noise is heard when driving at a constant speed not when accelarating or breaking
it is comming from the left side of the engine (when sitting in the truck)
the truck drives very very strong does not smoke...........
hope to hear from you.
engine was rebuild in '04 and aproxamatly 10000 mls.
drove the truck for about 2 hours but the noise stays.
the noise is heard when driving at a constant speed not when accelarating or breaking
it is comming from the left side of the engine (when sitting in the truck)
the truck drives very very strong does not smoke...........
hope to hear from you.
