Weird clacking noise coming from engine/tranny - Ford Powerstroke Diesel Forum
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Old 02-28-2014, 01:03 PM
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Weird clacking noise coming from engine/tranny

This started about a year and a half ago but has gotten worse over the past few months. Before, I only heard the noise while idling, and it was very soft. Now it's much louder and I hear it during deceleration (10-15mph) and idling on a 1996 F-250 7.3

It sounds like something is loose and the vibration from the engine is causing it to slap up and down. For the most part the noise is completely random: clack, clack....clack..clack......clack, clack, clack. I have noticed it is much more consistent and louder at higher altitudes and when the truck is working hard.

I can't seem to track down where its coming from for the life of me. The clack sounds like its coming from an external component, not from inside the engine, transmission thankfully. Any input on how I can solve this besides having a mechanic diagnose it?
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Old 02-28-2014, 02:54 PM
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Manual or auto? Manual then its time for a single mass clutch, auto looking at worn front bearing, broken flexplate teeth, TC internal damage. For either: loose motor to trans bolts causing misalignment, loose starter, motor mount, trans mount.
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Old 02-28-2014, 07:42 PM
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Or cracked flex plate (around the hub). Cheers!
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Old 03-03-2014, 05:10 PM
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UPDATE:

After further investigation, it appears the clacking is coming from the top end of the engine. Still not sure if its internal or external. I also have an update of the sound. Theres a small click that comes before the clacking starts.

Sound: CLICK, clack....,clack,clack...clack..................... .........................CLICK, clack, clack, clack....clack
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Old 03-04-2014, 09:17 AM
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Open a photobucket account take a video, upload it, and post please. Meanwhile remove the intake and look around the turbo inlet. Grab the impeller (engine off) and try and move it around (should not be able to push/pull in any direction, it should only rotate). I'm wondering if your turbo bearings are shot and allowing the impeller to strike the housing.

Next, pull both valve covers and check the push rods and rockers. They should be tight, any real loose parts generally means bent push rod. Not common but definitely a weak spot in these engines.

Last edited by BigFuel; 03-04-2014 at 09:21 AM.
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