Will 4 flywheel bolts do?

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

Personally I would remove them and replace ALL of them with new ones.

However, someone here on MUD posted they had ran for years with only three. Your call... :D
 
I don't like taking chances with stuff like that, I would take the time and get them out. We broke 1 in a friends 350 a few days ago. We messed with it and got it out with a chisel and hammer, ever so slowly. Replaced all the bolts with brand new ones and felt alot better about it later on.

Chris
 
They should come out easily. Most definitely remove the broken ones and replace with new....since you broke 2. Dealer has them and the locking tabs that were used on the F engine. Oh, and I think some red loctite.


Ed
 
Have an engineer calculate the amount of energy that flywheel will be carrying at 2000 rpm. Then imagine that amount of force coming through your floorboard at your ankles. Then get some new bolts and properly torque them into place. Just my 2 cents.......
 
mtrdrms said:
Will 4 flywheel bolts do?
Click to expand...


No.




mtrdrms said:
I broke two installing the flywheel on my 71 1f.
Click to expand...

Now you get to learn about broken bolt removal.



mtrdrms said:
Can I get away with this?
Click to expand...


You already broke two bolts off. Why did they fail? Are you using a torque wrench on these? Are you just aping on them, or are you just running them in with an impact gun?


What condition do you suppose the other remaining bolts are in, if you have broken two others already?




mtrdrms said:
shoulld I spend the rest of the day trying to get them out of the crank?
Click to expand...


Remove them and replace all six along with the three lock plates:

90913-01016 Bolt X 6

13455-60010 Lock plate X 3
 
Remove and replace. It may help to get a can of compressed air and spray the broken bolt with the air can up side down. Freezing cold liquid will help with extracting by shrinking the bolt. Works for me every time. Make sure you torque them properly so you don't snap em again.
 
Toyrod said:
Have an engineer calculate the amount of energy that flywheel will be carrying at 2000 rpm. Then imagine that amount of force coming through your floorboard at your ankles. Then get some new bolts and properly torque them into place. Just my 2 cents.......
Click to expand...

I'm imagining the ring-gear teeth as tunsten-tipped teeth on a massive out-of-control circular-saw blade. And I can definitely see the flywheel sawing through the bellhousing, floor, and Andy's legs in milliseconds before he careers off the dirt track into a bottomless ravine ................:hhmm:

But then my name issssss lostmarbles....
 
it has to go thru the input on the tranny also with the clutch disc under-pressure between the clutch and the flywheel..

my guess is if it somhow got completely free that it would go out the bottom thru the sheet metal cover, with gravity..
 
Last edited:
bustanutley said:
it has to go thru the input on the tranny also with the clutch disc under-pressure between the clutch and the flywheel..
Click to expand...

I agree. The flywheel is also centered by the crankshaft, so there really aren't any forces ripping it out to the side. If it breaks its likely going to stay more or less where it is and spin on the crank/input shaft, possibly ruining them. Those six bolts are only loaded in shear and carry only as much torque as your engine can apply to your drivetrain or visa versa - four would probably be fine except for that 0.1% case where you're bumping things while stuck, or hit from behind, or something like that and :: pow ::
 
if it happened to be that the fly wheel was flung from the crank in one piece, with the clutch disengaged, it would be thrown with an incredible force. I calculated that a 25 lb crankshaft being sling shot at 2000 rpm, you would have 62,161 ft lbs of force upon ejection. Meaning that the fly wheel would hit the bell housing with a force of around 62,161 ft lbs of force. I'm sure that it would carry enough force to blow through the rest of the vehicle and go where ever the hell it wants to go.
Granted, I don't see that happening, especially at 2K rpms, but it's plausible.
 
Put it this way, all manufacturers are always looking to cut costs, if they could do it with 4 bolts they wouldn't be using 6 bolts!!
 
Why take the chance of something happening out on the trail and ruin the trip by not completing the job correctly. You are into this far so just do it right and don't worry about afterwards. Just my .02.
 
Yeah, it won't be the whole flywheel that comes at you, just a broken, whirling chunk of gear-toothed steel;)
Just get new bolts already.......:rolleyes:


Let's see.....six cylinders.....six flywheel bolts:hhmm: Coincidence? I think NOT!:D


Ed:beer:
 
I honestly think the likely hood of it coming off and killing anybody is pretty flippin' slim.

I don't have a bit of a problem seeing it getting loose and knocking or juddering.

10 minutes with an engraving tool to get them out, or a few hours pulling the trans again to replace the flywheel.
 
You must log in or register to reply here.

Share this page

Back
Top Bottom