crankshaft straighting

[BILLSMOWERS]

just tried the straightener on a quantum engine and the crank snapped so will not be buying i would not want a crank to break on a mower with a blade on it

[GardenKit]

Just what I have always been wary of Bill, and its what Briggs warn us about after all.

 

How far was it bent? Any pics of the break?

 

So did you borrow the use of straightener to evaluate before buying, as you said you wont be buying?

[BILLSMOWERS]

Just what I have always been wary of Bill, and its what Briggs warn us about after all.

 

How far was it bent? Any pics of the break?

 

So did you borrow the use of straightener to evaluate before buying, as you said you wont be buying?

 

i will get a pic latter for you it was quite bent the needle went from one end of the scale to the other i had the engine off so went down to him with the engine to try it out he guided me on how to do it the crank was nearly straight so just tweaked it a bit moor and bank off it went no warning at all the crank looked like cast very grainy appearance not like steel i would say it was ductile iron which would account for the sudden break:thumbdown:

[mikerecike]

Fűnyírómotor főtengelyének egyengetése (Lawn Crankshaft straightening):

interesting

[mikerecike]

Here's one that Barrie with a keen scientific eye will appreciate REDNECK CRANKSHAFT STRAIGHTENING:

[GardenKit]

Here's one that Barrie with a keen scientific eye will appreciate REDNECK CRANKSHAFT STRAIGHTENING:

Nice technique. Who needs a jig?

[Logit]

I guess you just use different sized hammers for different diameter shafts, very scientific

[BILLSMOWERS]

as promised pics of crankshaft

[GardenKit]

Thanks for posting the Pics Bill.

 

Just goes to show that the engine manufactures know what they are talking about.

 

I have not attempted to straighten one for years. Those I did were OK, but after seeing your pictures I will never do another.

[Warners]

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.

 

Thats a good point... I didn't even know this could be done. We had a bent crank on a Honda, pulled the old crank out fitted a new one. Easy job and i'd imagine probably wasn't much more expensive than the cost of having it straightened......