1978 460 engine chatter, rattle
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1978 460 engine chatter, rattle
Hello,
Thanks in advance for any help. I have a 78 F250 with
a 460. When I accelerate hard I hear a chattering sound from
the engine compartment. Once the engine is warmed up this
stops. The is very temperature dependent. In the winter it
does it more and less in the summer. Any ideas? *****
Thanks in advance for any help. I have a 78 F250 with
a 460. When I accelerate hard I hear a chattering sound from
the engine compartment. Once the engine is warmed up this
stops. The is very temperature dependent. In the winter it
does it more and less in the summer. Any ideas? *****
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New User
Joined: Jul 2004
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Sorry, wrong forum. It sounds like the chatter, like metal slapping together.
I thought it might be the choke flap slapping, but there is no drop or increase
in power when it is doing it. Once in the dead of winter is was very cold
and it would make the noise during idle. I was able to listen to it with the
hood open. The sound was common from the front of the motor. I thought
it might be the water pump. I checked the pump barring and it did not
wobble with the belt off.
So the noise is comming from the front of the engine. The colder it is outside
the worse it does it. Once the engine is good and hot it does not to it.
Thanks, *****
I thought it might be the choke flap slapping, but there is no drop or increase
in power when it is doing it. Once in the dead of winter is was very cold
and it would make the noise during idle. I was able to listen to it with the
hood open. The sound was common from the front of the motor. I thought
it might be the water pump. I checked the pump barring and it did not
wobble with the belt off.
So the noise is comming from the front of the engine. The colder it is outside
the worse it does it. Once the engine is good and hot it does not to it.
Thanks, *****
Logistics Pro
Joined: May 2003
Posts: 4,238
Likes: 21
From: Northern Illinois
Did you check the fan clutch? All I can think of
If the bearing goes bad in the water pump you will know, it will leak anti-freeze all over as it will cause the seal to blow.
????? You got me....
If the bearing goes bad in the water pump you will know, it will leak anti-freeze all over as it will cause the seal to blow.
????? You got me....
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The clutch fan is relatively new, but that does not mean anything. I'll give it
a look. Any idea how I can rule the clutch fan out? Take it off and see if
the noise goes away? *****
a look. Any idea how I can rule the clutch fan out? Take it off and see if
the noise goes away? *****
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Logistics Pro
Joined: May 2003
Posts: 4,238
Likes: 21
From: Northern Illinois
There are 2 types of fan clutches, centrifugal and thermostatic. the thermostatic turn's fairly tight untill it is warmed up and it turn's easier the warmer it get's, the centrifugal, self explanatory. there should be no abnormal binding, or chatter coming from there.
Cargo Master
Joined: Apr 2004
Posts: 2,574
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From: Golden, CO
Originally Posted by WillySixGun
it might be the water pump. I checked the pump barring and it did not wobble with the belt off.
So the noise is comming from the front of the engine. The colder it is outside
the worse it does it. Once the engine is good and hot it does not to it.
Thanks, *****
So the noise is comming from the front of the engine. The colder it is outside
the worse it does it. Once the engine is good and hot it does not to it.
Thanks, *****
My real advice is to get one of those "mechanics" stethoscopes and try to isolate the noise. The low buck approach is to use a long piece of rubber hose, one end to your ear, other end to the motor. It's actually kind of fun to poke around and identify the parts as they work.
One other thing, watch out for moving parts. I never heard a machine say "ouch".