ZF6 noisy. Pilot Bearing? - Ford Powerstroke Diesel Forum
Please Visit our Site Sponsors
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 01-03-2012, 06:24 AM
Compression Ignition Addict

Join Date: Jan 2008
Posts: 163
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
ZF6 noisy. Pilot Bearing?

My truck is a 2002 model 7.3 ZF6. I bought the truck from my father who bought the truck brand new in late 2001. The truck currently has 132xxx miles.

Currently the truck has an OE replacement clutch and a Southbend 13" flywheel. The clutch has roughly 20k miles on it. My concern is with the OEM replacement pilot bearing, as I know this is/can be a weak point. In fact, the truck has had one go out in the past.

It just developed a noise that sounds very similar to a bad wheel bearing, but because of the conditions under which it occurs, I'm thinking it is related to the clutch or trans.

The noise is most apparent when in OD at freeway speeds and no throttle is applied. As soon as I let off the throttle I get a subtle "groaning" or "rumbling" sound. If the clutch pedal is depressed, the sound goes away. As soon as the pedal is released, the sound comes back. The sound will also show up under the same conditions in direct (4th) gear, but not as pronounced. No unusual noise or symptoms at any other time. Shifting is smooth. Pedal action is smooth and consistent.

Does this sound like a pilot bearing on its way out? Something else off hand?
If so I'd really like to catch it before it causes more damage.

Thoughts and insight appreciated

Reply With Quote Quick reply to this message
Sponsored Links
Old 01-03-2012, 04:58 PM
Compression Ignition Addict

Join Date: Mar 2011
Posts: 917
Thanks: 0
Thanked 5 Times in 4 Posts
Feedback Score: 0 reviews
The pilot bearing isn't doing anything when the clutch is released and the engine is moving the truck. If you hear it then, I'd start looking at the input shaft bearing in the transmission.

I had the same thing happen with a T-176 (wimpy) transmission behind a Chevy V8 in a CJ-5 years ago. Three of the bearing balls in the input shaft bearing were gone.
Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
What state or province do you live in?
Security Question
*Required, this field is not shown to others. Enter the last two characters of the word "Powerstroke"
Security Question #2
*Required, this field is not shown to others. "While balancing on a piece of wood, two inches by four inches known as a 2x4, john and his friend sally both spotted a dalmatian inside a truck with sirens, headed to put out a fire. State the animal mentioned in the sentence above."
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 01:31 AM.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.