Snapped front crank bolt. Next steps?
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Cargo Master
Joined: Aug 2011
Posts: 2,319
Likes: 89
Snapped front crank bolt. Next steps?
The front crank bolt at the main pulley/harmonic balancer snapped. (Do these trucks have a harmonic balancer? Not sure.)
How, you ask? I was turning over the motor over by hand with a long pry bar, then went to turn it over with starter after (injectors werent in), forgot the long pry bar was mounted, it then hit something got caught and BAM...it snapped.
Is the motor toast? Salvageable?
How, you ask? I was turning over the motor over by hand with a long pry bar, then went to turn it over with starter after (injectors werent in), forgot the long pry bar was mounted, it then hit something got caught and BAM...it snapped.
Is the motor toast? Salvageable?
Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
The front crank bolt at the main pulley/harmonic balancer snapped. (Do these trucks have a harmonic balancer? Not sure.)
How, you ask? I was turning over the motor over by hand with a long pry bar, then went to turn it over with starter after (injectors werent in), forgot the long pry bar was mounted, it then hit something got caught and BAM...it snapped.
Is the motor toast? Salvageable?
How, you ask? I was turning over the motor over by hand with a long pry bar, then went to turn it over with starter after (injectors werent in), forgot the long pry bar was mounted, it then hit something got caught and BAM...it snapped.
Is the motor toast? Salvageable?
How much of crank bolt sticks out or is it snapped off flush? I bet you could weld a nut on there and get it out without too much fuss.
More Turbo
Joined: Sep 2018
Posts: 544
Likes: 213
From: UT
ouch...those are 212ftlbs of torque too. I wonder if its best to try and drill that bolt out now. I think that torque value is no longer applicable since the head of the bolt is gone...maybe a reverse drill bit could get it out.
Banned
Joined: Dec 2018
Posts: 3,541
Likes: 458
That crankshaft pulley is the harmonic balancer or “vibration dampener” as Ford calls it.
might as well pull it off and get a new one and also a new Melling 208 oil pump because the front seal and old balancer is probably tired from age anyway. The bolt I know Riff-raff sells. (I might have a new Motorcraft balancer I’ll let go for a good price if you’re interested…I bought a Fluidampr and never used it.)
I’m not a broken bolt bolt extracting expert but it’s a common thing to deal with. Maybe not THAT particular bolt…I doubt too many people break these under normal circumstances considering how big it is. That starter is no joke and obviously it was trying to tighten it otherwise it would have broken it loose and started backing it out.
might as well pull it off and get a new one and also a new Melling 208 oil pump because the front seal and old balancer is probably tired from age anyway. The bolt I know Riff-raff sells. (I might have a new Motorcraft balancer I’ll let go for a good price if you’re interested…I bought a Fluidampr and never used it.)
I’m not a broken bolt bolt extracting expert but it’s a common thing to deal with. Maybe not THAT particular bolt…I doubt too many people break these under normal circumstances considering how big it is. That starter is no joke and obviously it was trying to tighten it otherwise it would have broken it loose and started backing it out.
Banned
Joined: Dec 2018
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I'm surprised it snapped like that. I've used the starter to break crank bolts loose, though I guess not giving it room to move the breaker bar first. That's a bummer.
How much of crank bolt sticks out or is it snapped off flush? I bet you could weld a nut on there and get it out without too much fuss.
How much of crank bolt sticks out or is it snapped off flush? I bet you could weld a nut on there and get it out without too much fuss.
Also I always thought the fan clutch nut (also right hand thread) was trying to tighten itself against the rotation of the engine, but that’s not really true I guess if the engine spins clockwise. Holding the nut steady with a wrench against the rotation of the engine would start backing if off.
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Cargo Master
Joined: Aug 2011
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I havent checked how much bolt is sticking out. I was too pissed off, I had to walk away.
I just assumed the other components would be damaged as well in the process. Am I wrong?
I just assumed the other components would be damaged as well in the process. Am I wrong?
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Cargo Master
Joined: Aug 2011
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so the motor must spin clockwise if holding a right hand thread bolt steady with a breaker bar causes it to loosen? Spinning the motor clockwise while holding the bolt steady accomplishes the same thing as holding the motor steady and spinning the bolt counter-clockwise, so I’m trying to figure out how the bolt didn’t just break loose when it whacked against the frame.
Also I always thought the fan clutch nut (also right hand thread) was trying to tighten itself against the rotation of the engine, but that’s not really true I guess if the engine spins clockwise. Holding the nut steady with a wrench against the rotation of the engine would start backing if off.
Also I always thought the fan clutch nut (also right hand thread) was trying to tighten itself against the rotation of the engine, but that’s not really true I guess if the engine spins clockwise. Holding the nut steady with a wrench against the rotation of the engine would start backing if off.
I will report back.
Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
If you can't weld a nut on it a machinist will be able to get it out worst case.
I'd NOT recommend trying an ez out. You're just going to end up with a piece of hardened steel broke off in your crank bolt making it harder to get the broken bolt out.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
Likes: 1,335
From: Elk Grove, CA
The front crank bolt at the main pulley/harmonic balancer snapped. (Do these trucks have a harmonic balancer? Not sure.)
How, you ask? I was turning over the motor over by hand with a long pry bar, then went to turn it over with starter after (injectors werent in), forgot the long pry bar was mounted, it then hit something got caught and BAM...it snapped.
Is the motor toast? Salvageable?
How, you ask? I was turning over the motor over by hand with a long pry bar, then went to turn it over with starter after (injectors werent in), forgot the long pry bar was mounted, it then hit something got caught and BAM...it snapped.
Is the motor toast? Salvageable?
Glad I'm not alone in that particular club anymore.
More Turbo
Joined: Sep 2015
Posts: 640
Likes: 282
From: Texas
Wait. Are you sure it's broken? I ask because this part...
This makes it sound like it is just broken loose. You should be able to just remove the bolt the rest of the way and post up a pic of either the bolt or the part that snapped off.
Maybe I misunderstood you, but it does sound like you can torque it back down and be fine... depending on if the breaker bar smashed anything else.
It must have spun the breaker bar until it hit something in the engine bay. When I went under the truck, the breaker bar was hanging straight down with gravity, not jammed into anything and the 24mm nut was turning....I need to double check it in the light tomorrow.
I will report back.
I will report back.
Maybe I misunderstood you, but it does sound like you can torque it back down and be fine... depending on if the breaker bar smashed anything else.
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
It must have spun the breaker bar until it hit something in the engine bay. When I went under the truck, the breaker bar was hanging straight down with gravity, not jammed into anything and the 24mm nut was turning....I need to double check it in the light tomorrow.
I will report back.
I will report back.
Laughing Gas
Joined: Jun 2013
Posts: 1,097
Likes: 514
From: Yokosuka Japan
that would be the best result, a little freaky for the OP but much better than snapping it.