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'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

Thread: Strange high metallic knocking sound Reply to Thread
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  Topic Review (Newest First)
10-10-2018 02:17 PM
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Quote:
Originally Posted by RT View Post
Might be worth picking up a cheap stethoscope and go hunting. Just don't get it caught in the fan...
Good idea. Will try that.
10-10-2018 01:57 PM
RT Might be worth picking up a cheap stethoscope and go hunting. Just don't get it caught in the fan...
10-10-2018 01:18 PM
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Quote:
Originally Posted by Oneof6 View Post
Possible, even on a low mileage truck like yours. There is an idler pulley that one can replace for about 20 bucks or refurbish with an new sealed bearing for 5 if you can press a bearing in an out. Entirely possible and highly likely regardless of low mileage is that the spring loaded belt tensioner is weak, a function of time tensioned more than miles, allowing the belt to misalign and squeal. Not a difficult R&R and around 100 bucks in parts.


The belt removal test RT recommended is the logical start, assuming nothing else is in contact with the belt.
Hi, were checking the pulleys and tensioner. The slight movements are not play - just normal.
Tensioner not weak.
Sound does not come from there, comes from a lower point on passenger side.
There is the belowed up pipe kit stainless steel installed. Might the sound come from there?
10-09-2018 07:22 PM
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Quote:
Originally Posted by Oneof6 View Post
Possible, even on a low mileage truck like yours. There is an idler pulley that one can replace for about 20 bucks or refurbish with an new sealed bearing for 5 if you can press a bearing in an out. Entirely possible and highly likely regardless of low mileage is that the spring loaded belt tensioner is weak, a function of time tensioned more than miles, allowing the belt to misalign and squeal. Not a difficult R&R and around 100 bucks in parts.


The belt removal test RT recommended is the logical start, assuming nothing else is in contact with the belt.
Yes could be. We noticed some slight movement of a pulley and tensioner also.
Thanks.
Will study tomorrow.
10-09-2018 06:37 PM
Oneof6
Pulleys

Possible, even on a low mileage truck like yours. There is an idler pulley that one can replace for about 20 bucks or refurbish with an new sealed bearing for 5 if you can press a bearing in an out. Entirely possible and highly likely regardless of low mileage is that the spring loaded belt tensioner is weak, a function of time tensioned more than miles, allowing the belt to misalign and squeal. Not a difficult R&R and around 100 bucks in parts.


The belt removal test RT recommended is the logical start, assuming nothing else is in contact with the belt.
10-09-2018 06:28 PM
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Quote:
Originally Posted by RT View Post
Take your serpentine belt off and see if the noise goes away.
thank you. Will do tomorrow and see. May be any pulley bad?
10-09-2018 06:10 PM
RT Take your serpentine belt off and see if the noise goes away.
10-09-2018 03:54 PM
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Strange high metallic knocking sound

Hi everybody, maybe this sounds familiar to somebody. Where could this sound come from. It sounds especially strong on the passenger side.
Thanks for any hint.

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