Flywheel cracking?
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Mudding
Joined: Feb 2018
Posts: 215
Likes: 21
From: Kauai, Hawaii
Auto trans flywheels tend not crack, ususlly only manuals from clutch wear and abuse.
If your torque plate/flex plate was damaged like the one pictured, you would definately hear it, especially when on/off the throttle or when it shifts.
Leave the transmission in park when breaking the crank pulley loose.
If your torque plate/flex plate was damaged like the one pictured, you would definately hear it, especially when on/off the throttle or when it shifts.
Leave the transmission in park when breaking the crank pulley loose.
Camel Trophy
Joined: Oct 2016
Posts: 4,867
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From: Michigan
Usually a cracked flex plate noise appears when you move the vehicle from drive to reverse...or reverse to drive with your foot on the brake. Sometimes you will get a constant ticking/clicking, but it will definitely be more prominent while doing what l mentioned earlier.
Brian.
Brian.
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Mudding
Joined: Feb 2018
Posts: 215
Likes: 21
From: Kauai, Hawaii
Usually a cracked flex plate noise appears when you move the vehicle from drive to reverse...or reverse to drive with your foot on the brake. Sometimes you will get a constant ticking/clicking, but it will definitely be more prominent while doing what l mentioned earlier.
Brian.
Brian.
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Mudding
Joined: Feb 2018
Posts: 215
Likes: 21
From: Kauai, Hawaii
i did turn the crank to inspect other sides of the plate- no visible cracks. I’m actually pretty surprised how intact everything is!
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Mudding
Joined: Feb 2018
Posts: 215
Likes: 21
From: Kauai, Hawaii
not sure what that sounds like. It’s quite loud. Almost like a flapping or muffled tick without a lot of initial attack. Not sure how else to explain it. But you’re right, it’s most likely unrelated to the flex plate. I thought maybe they were connected somehow.
Winching
Joined: Apr 2016
Posts: 524
Likes: 120
From: Chattanooga TN
Check the nuts holding the Y-pipe to the exhaust manifolds. My driver side was loose when I bought the truck and I had the loud clicking on startup like you describe. Snugged them up and it was nice and quiet.
Last edited by Red5; Jun 20, 2018 at 09:07 PM.
Camel Trophy
Joined: Oct 2016
Posts: 4,867
Likes: 1,410
From: Michigan
Yeah, sounds more like an exhaust leak at manifold. Look up at the y-pipe connections, usually cracks along plate/pipe flange. I've welded mine twice, pulling it soon...to weld it again. Or the three bolts are loose or gasket bad. Gasket is just a thin piece of metal.
Brian.
Brian.
TReK
Joined: Jul 2017
Posts: 3,387
Likes: 488
My engine needed main, rod and cam bearings.
It ticked loudly as it warmed up, the oil pump gears were broken too.
The sound seemed to come mostly from the driver's side rear of the engine. After replacing the oil pump, as well as lifters, the noise remained, leading me to belive I had a slipped liner, which it did not. I also thought it may be the flex plate, but that was good too.
I expected a knock, not a tick, given the problem.
My 4.6 has 122k miles, ran excellent, and did not heat, it just made a come and go racket.
Pull the rod caps, and look up at your cam bearings too.
I'm not saying they are definately the problem, but it is very possible, and would not be uncommon for these engines. Not a terrible job to do either.
It ticked loudly as it warmed up, the oil pump gears were broken too.
The sound seemed to come mostly from the driver's side rear of the engine. After replacing the oil pump, as well as lifters, the noise remained, leading me to belive I had a slipped liner, which it did not. I also thought it may be the flex plate, but that was good too.
I expected a knock, not a tick, given the problem.
My 4.6 has 122k miles, ran excellent, and did not heat, it just made a come and go racket.
Pull the rod caps, and look up at your cam bearings too.
I'm not saying they are definately the problem, but it is very possible, and would not be uncommon for these engines. Not a terrible job to do either.