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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

Motor knock

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Old Nov 23, 2008 | 02:28 PM
  #1  
kmiller7351's Avatar
kmiller7351
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Trailering
20 Year Member
Joined: Mar 2004
Posts: 21
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From: The other gambling paradice
Motor knock

I hear a knock comming from the top of the motor. I think it all started when I was driving home. It overheated, shut down but I eventually got it home. Low on antifreeze, i replaced the loss but noticed a knock that has progressed to a steady knock. It still runs but afraid to drive at this point but it dosent sound good.

However one day I started the truck and noticed the charging light on. I opened the hood and saw that the serp belt was off and the knock was absent until I hooked it back up, then returned. Still no loss of anti freeze but belt is starting to shred. Any ideas, repair thoughts, ect.?

It also leaks oil from the back which I think it is the head gasket on a regular basis.

1991 f-150 straight 6.

Thanks
 
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Old Nov 23, 2008 | 02:32 PM
  #2  
quicklook2's Avatar
quicklook2
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Joined: May 2004
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Likes: 6
From: Lakewood, Ohio
you need a new water pump.

with engine off and belt removed, grasp pulley on its axis.

if it moves at all you have found your problem.

do compression check to see if head gasket is blown.
 
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Old Nov 23, 2008 | 03:29 PM
  #3  
kmiller7351's Avatar
kmiller7351
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Trailering
20 Year Member
Joined: Mar 2004
Posts: 21
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From: The other gambling paradice
Well it is definitley the water pump so depending on the involvement on the repairs that can be done myself. Head gasket however might involve my mechanic. The oil leak comes from the back of the motor, towards the top but I can't get a clear view. I hear tapping everytime, mostly when I accelerate.
 
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Old Nov 23, 2008 | 03:46 PM
  #4  
quicklook2's Avatar
quicklook2
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Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
oil leak is probably valve cover.

do water pump check.

compression check.

clean off back of engine and use a mirror to see what is leaking.
 
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