Rattle/grinding under my feet.. I think? - Diesel Forum - TheDieselStop.com
'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.

 
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post #1 of 9 (permalink) Old 02-09-2019, 11:36 PM Thread Starter
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Rattle/grinding under my feet.. I think?

I have an 02 7.3 with just over 250k on it. For the past month or so I've been hearing some rattling or grinding coming from either the front and or somewhere in between. I dont hear it at idle and I dont hear it above 20 mph. As soon as I start coasting below 20 it becomes real prominent till I come to a stop. I have no clue what it is. Hubs are new breaks and all components are newish, fluid level is good... I was told it could be the flex plate, but i assume then I would hear it at idle as well? Please help I really need to get it fixed or at least diagnosed. Thanks guys. If you guys or anyone you know is around the Loveland / fort Collins area and could help out that would be great.
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post #2 of 9 (permalink) Old 02-10-2019, 06:50 AM
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Doesn’t a faulty flexplate usually make the most noise when the starter is engaged?

Does it happen in both 2WD and 4WD?

Does it continue the same if you tap your brakes while it is occurring?

Not looking at the flexplate, you could jack up the front end and set jackstands for safety and then rotate the front tires by hand while listening for noise and feeling for rough spots while spinning.


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post #3 of 9 (permalink) Old 02-10-2019, 11:09 AM
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It could be a cracked flexplate or its completely stripped around the mount bolts

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post #4 of 9 (permalink) Old 02-10-2019, 03:44 PM
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How old are those new hubs. If they weren't from ford, I'd guess your new hubs failed.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
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post #5 of 9 (permalink) Old 02-11-2019, 08:17 AM Thread Starter
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4wd works
The hubs are warn hubs and less than a month old.
I dont hear any noise at idle or start up, just when I coast or cruise below 20 mph.
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post #6 of 9 (permalink) Old 02-11-2019, 09:58 AM
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Quote:
Originally Posted by Foxn194 View Post
4wd works
The hubs are warn hubs and less than a month old.
I dont hear any noise at idle or start up, just when I coast or cruise below 20 mph.
And you hear the noise in both 2WD and 4WD and when the hubs are locked and unlocked in 2WD ?

Noise always the same?


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post #7 of 9 (permalink) Old 02-11-2019, 06:23 PM
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U Joint?

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
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post #8 of 9 (permalink) Old 02-11-2019, 10:51 PM
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Front wheel bearing assembly...?
Jack it up and feel for bearing noise/play. Had to replace mine on my dually at 250k.


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post #9 of 9 (permalink) Old 02-13-2019, 05:53 PM
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I had a similar noise once, seemed like it was right under my left foot. So I concentrated my efforts to find it in the front. After finding nothing I checked my rear differential and I had a very bad axel carrier bearing. This is what I would do

1. Check your starter attachment bolts, they can come loose and make similar low speed noise.

2. Lock your hubs in, if the noise goes away your hub spindle bearings are bad, they are replaceable.

3. With the hubs unlocked jack one side up at a time and hand roll it, if you can feel ANY bearing roughness it is very bad, but just because you can't feel it doesn't mean there are no bearing element defects.

4. Check flex plated condition and connection

5. Service your rear differential, if you have silver fish scale looking shavings in the differential you have a bearing going bad, if you have both silver and dark debris you have a opinion, carrier and or wheel bearing that has failed.

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