throwout bearing knocking
Thread Starter
|
Senior User
Joined: Jul 2009
Posts: 188
Likes: 0
throwout bearing knocking
I just installed a South Bend SMF in my 89 IDI with the ZF5. The problem is that anytime the clutch is released there is what sounds a lot like a rod knock coming from the bellhousing area. This is especially noticeable as the truck is idling without a foot on the clutch. The knocking increases in rate as rpms go up. If I just put slight pressure on the clutch pedal - the knocking goes completely away - I guess because the throwout bearing is pressed up against the pressure plate fingers. I spoke with South Bend about it and they suggested replacing the clutch fork - as it could be worn. Does this sound like the culprit? Or is it possible that I slid the clutch fork onto the bearing the wrong way? I went ahead and ordered a new fork anyway.
Thanks
Thanks
Senior User
Joined: Jan 2011
Posts: 275
Likes: 0
sounds like it is the throwout bearings itself. they like to make kind of noise when they start getting old, and worn out. it could be possible that the fork is too close for also being worn out, but i really doubt you put in backwards. it really only goes in one way, and by stepping on the pedal means it is not the for but the throwout bearring. i would do that first.
Thread Starter
|
Senior User
Joined: Jul 2009
Posts: 188
Likes: 0
It is a new bearing supplied by South Bend, I would like to hope that a bad bearing from them would be unlikely considering their product's quality/expense.
But is it possible that I put the fork onto the bearing wrong? In other words, does the bearing need to be rotated at all to fit a certain way snugly on the fork or does it simply go onto the bearing in any way?
Thanks
But is it possible that I put the fork onto the bearing wrong? In other words, does the bearing need to be rotated at all to fit a certain way snugly on the fork or does it simply go onto the bearing in any way?
Thanks
Thread Starter
|
Senior User
Joined: Jul 2009
Posts: 188
Likes: 0
I am sure I got it on the quill/input shaft correctly however, I don't know if I slid it onto the bearing correctly. Is there a certain way it goes? I mean I put it onto the "void/recessed" part of the bearing, but do I have to rotate the bearing a certain? Do you have to rotate the bearing a certain way to fit properly onto the fork (with no play/knocking) or does it just rotate within the fork?
Trending Topics
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
My 1990 F250 was doing the same thing, noisy at idle, and noise would completely go away if you just put a light pressure on the clutch pedal. But mine has 377k miles on the original driveline, never touched, original clutch as well.
Could be the fork or the new throw out bearing. Even the highest quality brands have defects sometimes.
Could be the fork or the new throw out bearing. Even the highest quality brands have defects sometimes.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post
diesel85
Clutch, Transmission, Differential, Axle & Transfer Case
1
Dec 3, 2015 10:01 AM
jkschneider
1987 - 1996 F150 & Larger F-Series Trucks
9
Dec 14, 2009 12:42 PM
joehar
Clutch, Transmission, Differential, Axle & Transfer Case
5
Aug 4, 2002 02:33 PM