wierd knock under load....
Posting Guru
Joined: Feb 2008
Posts: 1,081
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From: Loganville, WI
as mentioned before knock can be caused by the distributer being advanced too far, pulling the plug wires will work. If it continues to knock after pulling the wires it is not a timing issue. A rod knock is generally lower in pitch then a knock caused by timing. If I recall correctly a timing knock would get worse sounding the more rpms you turn and the rod knock will be more noticeable at lower rpms.
Thread Starter
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Elder User
Joined: Feb 2010
Posts: 565
Likes: 0
From: naples, fl
im trying to get my hands on a tester right now...been trying to for the past week...
Posting Guru
Joined: Feb 2008
Posts: 1,081
Likes: 0
From: Loganville, WI
I'm not sure why it would get better, but as formentioned if you remove the wires and it gets better that will eliminate the timing knock. Is the knocking noise high or low pitched and were is it coming from in the engine? You can use a wood dowel or something to listen to where the knock is located if you do not have a stethascope.
It could still be a fuel issue as well, just because you put new fuel in it does not mean it's good, it might have water in it. Just a thought.
It could still be a fuel issue as well, just because you put new fuel in it does not mean it's good, it might have water in it. Just a thought.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
... Has to be moving ...
Is it Automatic??
Does it do it setting still in gear??
Does it do it setting still with Throttle Application, Brakes on??
Do you have to put a load on the motor??
Can you free rev it and get it to do it?? (ie: snap the throttle)
-Enjoy
fh : )_~
Is it Automatic??
Does it do it setting still in gear??
Does it do it setting still with Throttle Application, Brakes on??
Do you have to put a load on the motor??
Can you free rev it and get it to do it?? (ie: snap the throttle)
-Enjoy
fh : )_~
Thread Starter
|
Elder User
Joined: Feb 2010
Posts: 565
Likes: 0
From: naples, fl
I'm not sure why it would get better, but as formentioned if you remove the wires and it gets better that will eliminate the timing knock. Is the knocking noise high or low pitched and were is it coming from in the engine? You can use a wood dowel or something to listen to where the knock is located if you do not have a stethascope.
It could still be a fuel issue as well, just because you put new fuel in it does not mean it's good, it might have water in it. Just a thought.
It could still be a fuel issue as well, just because you put new fuel in it does not mean it's good, it might have water in it. Just a thought.
... Has to be moving ...
Is it Automatic??
Does it do it setting still in gear??
Does it do it setting still with Throttle Application, Brakes on??
Do you have to put a load on the motor??
Can you free rev it and get it to do it?? (ie: snap the throttle)
-Enjoy
fh : )_~
Is it Automatic??
Does it do it setting still in gear??
Does it do it setting still with Throttle Application, Brakes on??
Do you have to put a load on the motor??
Can you free rev it and get it to do it?? (ie: snap the throttle)
-Enjoy
fh : )_~
only thing iv done with the wires is make them 8mm
Posting Guru
Joined: Aug 2009
Posts: 1,058
Likes: 0
From: emporium
doesnt really have to do with just wires, timing to, bad gas or fuel pump can cause it to. it would make more of a ping sound though.
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Posting Guru
Joined: Aug 2009
Posts: 1,058
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From: emporium
in my experiance when it sounds like a little man with a hammer its no good. bent rods, valves, shot bearings. could be a lot of things. could be a weak oil pump starving the heads for oil. i would pull the plugs and look down in with a light. see if the piston head is banged up. could be a broken piston ring and a little chunk of it is up on top of the piston. just saw that in a 350 last month on an engine tear down. maybe pull the valve covers off and look to see how dry it is or a bad valve.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Sure you don't have an exhaust pipe or something hitting something ...
Doesn't sound like the motor internals to me. Maybe timing, you could adjust a couple degrees and see what happens to the sound.
[edit] If you're running it WOT it's not internal .. a 351 would have exploded by now! [/edit]
-Enjoy
fh : )_~
Doesn't sound like the motor internals to me. Maybe timing, you could adjust a couple degrees and see what happens to the sound.
[edit] If you're running it WOT it's not internal .. a 351 would have exploded by now! [/edit]
-Enjoy
fh : )_~
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Do you have a way to capture the sound ... Video, Audio recorder ... Something so the peeps on here can hear it, It is extremely hard to diagnose sounds from explanations.
A knock to one is a ping to another!
-Enjoy
fh : )_~
A knock to one is a ping to another!
-Enjoy
fh : )_~