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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Here a knock there a knock....

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Old Feb 16, 2012 | 09:33 PM
  #1  
mustangmatt's Avatar
mustangmatt
Thread Starter
|
Cross-Country
Joined: Sep 2011
Posts: 91
Likes: 3
Here a knock there a knock....

hey guys, I have a few knocks in my motor I want to try and clear u
p without much tearing into. Unsure how long ago, but the motor was rebuilt. I use 10w-30 castrol high mileage oil with a
purlator[s
p?] filter. Funcitonal oil
pressure
gauge shows about 45
psi at cold and around 20 warm at idle. 5.8L motor.

First I have a knock from the to
p end that is there when i first crank u
p the truck, goes away when
put in drive however it returns at certian r
p
m's. Would my best route here be to just change the lifters out?[I wouldn't mind a cam at the same time if this is the case] almost sounds like a metal line ta
p
ping against something else metal but I checked my oil
pressure gauge line and it's not touching anything.

Second, I have a low noise coming from the motor, if i had to guess I would say it was a main bearing but from what I hear if it were a main beaing going bad my oil
pressue would suffer. I can only hear this noise at idle with my head near the transmission tunnel in the cab,
po
p the hood and I cant hear it over the fan and noisy alt. Doesn't seem to be there when the motor is revved u
p.

Would a com
pression check hel
p
prove or dis
prove anything? Can I save this motor before it takes a cra
p on me?
 
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Old Feb 16, 2012 | 09:36 PM
  #2  
mustangmatt's Avatar
mustangmatt
Thread Starter
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Cross-Country
Joined: Sep 2011
Posts: 91
Likes: 3
Sorry for all the unnessary lines. my letter
p is broken and i have to
paste one everytime i need one, I know it make it annoying to read.
 
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Old Feb 16, 2012 | 09:37 PM
  #3  
Midnite1987's Avatar
Midnite1987
Cargo Master
Joined: Jan 2011
Posts: 2,791
Likes: 8
From: Edmonton AB, Canada
Club FTE Silver Member

I think ya got something going on with your p's lol everyone looks like it hit enter too lol
 
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Old Feb 16, 2012 | 09:51 PM
  #4  
cj06's Avatar
cj06
Posting Guru
Joined: Feb 2010
Posts: 2,006
Likes: 2
From: CASA GRANDE AZ
mains wont knock , hows your flywheel , flex plate ? it could be the cause of the knock !
the taping on top , have you checked the rocker arms ?
 
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Old Feb 17, 2012 | 08:23 AM
  #5  
mustangmatt's Avatar
mustangmatt
Thread Starter
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Cross-Country
Joined: Sep 2011
Posts: 91
Likes: 3
The bottom end noise kind of sounds like a roaring bearing. I will crawl under it tonight and see if I can hear it. Tomorrow I'll pop off the valve covers...their leaking anyway.

Will update when I find something out
 
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Old Feb 17, 2012 | 08:13 PM
  #6  
cj06's Avatar
cj06
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Joined: Feb 2010
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Likes: 2
From: CASA GRANDE AZ
well then that could be a bad main
 
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