crankshaft straighting

[BILLSMOWERS]

dropped in to a shop i visit sometimes as i buy second hand machines from them from time to time i saw the boss with a engine set up in a crankshaft straightener he told me he has been doing this for years with no problems then told me i have bought machines with straightened crankshafts:cursing: now i am worried what i may have sold:thumbdown: what are you guys views on crank straightening?

[treequip]

Have you had any problems?

[Ian C]

Have you had any problems?

 

No body could straighten your crankshaft out andy! Call you later.

[H-A]

I have straightened outboard cranks, both solid and 3 part, no problems.

 

Normal procedure after big end replacement, Youtube has videos of it.

 

H-A

[BILLSMOWERS]

I have straightened outboard cranks, both solid and 3 part, no problems.

 

Normal procedure after big end replacement, Youtube has videos of it.

 

H-A

 

i am talking about bent crank from hitting a stump or bar etc bottom end where the blade attached

i have not had any problems with the machines i have unknowingly sold

the set up i saw was a jig with a pressure bolt on the top of the crank a equalizer bolt under the crank to take the strain off the aluminum sump pan

the thing is when he has straightened the crank there are no witness marks to show it was even done no one would even know ( i did'nt ) till he told me yesterday

[BILLSMOWERS]

the setup he has is like this

[adw]

Yes you can buy these, i have straightened plenty of cranks, the Honda ones are as soft as s t but the briggs ones you over bent as they spring back, never had a problem yet.

[BILLSMOWERS]

Yes you can buy these, i have straightened plenty of cranks, the Honda ones are as soft as s t but the briggs ones you over bent as they spring back, never had a problem yet.

so you think it is ok to straighten a bent crank shaft i had a fear of it braking and getting sued how would your insurance stand if a accident happened?

[GardenKit]

I bought on of these a few years ago and used it with some success. Some of the larger diameter Briggs cranks can be a bit difficult to get right though.

 

I have given up doing them now though for several reasons:-

 

It takes a while to take the engine off, straighten it, and put it back on. It does not take much longer to fit a new crank.

 

I will guarantee a repair with a new crank, but will offer no guarantee on a straighten.

 

Briggs state firmly that cranks should never be straightened.

 

Its a job to know where the crank is bent, sometimes they can be bent just inside the lower bearing. This will not straighten properly and will result in lower bearing failure.

 

I believe there is a chance of subsequent breakage after straightening. My insurance would take a dim view of me doing something that is condemned by Briggs, so in the event of an issue I could be left carrying the can, just because I did someone a favour with a cheap repair.

[WeFixIt]

i am talking about bent crank from hitting a stump or bar etc bottom end where the blade attached

 

i have not had any problems with the machines i have unknowingly sold

 

the set up i saw was a jig with a pressure bolt on the top of the crank a equalizer bolt under the crank to take the strain off the aluminum sump pan

 

the thing is when he has straightened the crank there are no witness marks to show it was even done no one would even know ( i did'nt ) till he told me yesterday

 

 

 

All good Groundcare machinery workshop will have a crank straightener!

So when you go and hit something a little to hard for the poor thing you won't have to coughs up for either a new crankshaft or even a new engine!!!

 

Crankshaft straightening has been going on for years, and if done correct like you said you never knew yours had been!