Loud banging while cranking
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Mountain Pass
Joined: May 2015
Posts: 128
Likes: 8
From: Cottonwood, California
Loud banging while cranking
When cranking 2005 6.0 this morning there was a very loud banging, like banging a hammer on a trash can.
Started in 3 seconds and banging stopped immediately once running.
Idled perfectly and no smoke or any other issues.
Temp was around 45 degrees so not too cold outside.
This has happened two or three times over the last year but only happens on the initial cranking.
If I shut off the truck and restart it usually will not do it the next time I crank it.
Any thoughts?
Started in 3 seconds and banging stopped immediately once running.
Idled perfectly and no smoke or any other issues.
Temp was around 45 degrees so not too cold outside.
This has happened two or three times over the last year but only happens on the initial cranking.
If I shut off the truck and restart it usually will not do it the next time I crank it.
Any thoughts?
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
I'm no expert, but it's not normal-- that much I do know.
I would suggest taking a video next time and posting it so the forum can at least hear it.
Perhaps it's something related to the starter or flex plate
I would suggest taking a video next time and posting it so the forum can at least hear it.
Perhaps it's something related to the starter or flex plate
Thread Starter
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Mountain Pass
Joined: May 2015
Posts: 128
Likes: 8
From: Cottonwood, California
I would take a video but it only happens once every few months, for the 3 seconds of cranking and then is totally normal next time I start up and will stay that way for months.
Scared the heck out of me though! lol!
Scared the heck out of me though! lol!
Laughing Gas
Joined: Apr 2016
Posts: 922
Likes: 1
From: SoCal
I think navistarnut is onto something there. If I remember correctly, someone had an issue like that and it had to do with the rare occurrence of the starter teeth lining up with a bad spot on the flywheel where there were damaged teeth. Hope that helps and rings someone's bell that does know. Good luck.
Laughing Gas
Joined: Jan 2005
Posts: 1,142
Likes: 24
Long shot but check your starter mounting bolts 6.0's have a rep for starters falling out. If you find that is your problem you may also have a broken mounting ear on the starter I would recommend you do yourself a favor and replace it with a 6.4 or 6.7 starter. The 6.4 is a direct bolt in the 6.7 requires one different bolt, it is highly documented on the internet.
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Mountain Pass
Joined: May 2015
Posts: 128
Likes: 8
From: Cottonwood, California
I think it was way too metallic to be a chopped up critter but just checked and saw nothing out of the ordinary.
The fly wheel theory could be the cause. I don't assume that there is anything I can do to check that out or assist in diagnosing this, is there?
The fly wheel theory could be the cause. I don't assume that there is anything I can do to check that out or assist in diagnosing this, is there?
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Laughing Gas
Joined: Apr 2016
Posts: 922
Likes: 1
From: SoCal
I believe you should be able to crawl under there and look. Might have to yank the starter. As far as being able to rotate the wheel I will let someone else answer as to how to do it safely. Maybe a quick Google or YouTube search will help.
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Tuned
Joined: Jul 2010
Posts: 360
Likes: 2
From: Greenville, SC
You may be able to bump the engine and take a series of Iphone pictures at each interval until you have the whole circumference photographed. If this is feasible, you might use a sharpie to mark the flywheel so you know if it turned too much after each bump.
There's another removal cover at the 3-oclock or 9-oclock position, but I think even harder to view what you need to see from that one.
I think you'll have to get creative on that one if you wanna check the teeth without yanking the tranny.
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