Anybody ever heard re-truing of bent crank 036 Pro

[RiverRat2]

Got in a saw last week with scored cylinder/piston weas checking it out to see if it was worth a top end kit,,, and found the clutch side seal leaking, real bad one time then would pull it over a few times & it would hold pressure???? then one time I was pulling it over and my bud was sitting @ eye level with the crank and noticed it wobbling, Too weird, there is no noticeable slop in the bearing but when you spin it steady you can definitely see it. any body got an idea??? other than parts saw????

 

[Rotax Robert]

Never seen it but have heard that over tightening a chain when the chain is hot then when it cools the chain will contract, overloading the shaft and slightly bending it.

Rotax

 

[PES+]

They can be trued

Most likely the crank lobes have shifted relative to each other. A machine shop could straighten it and true it I will be offering crank work in the not too distant future but am not set up to do it time effectively right now

 

[TimberPig]

As suggested by PEST, talk to a machine shop about having it trued.

In dirtbikes, snowmobiles and other similar 2 stroke engines, crank rebuilds are common, and they must be trued following rebuilding, or be rebuilt using a jig that allows the crank to be pressed back together in correct alignment.

Unless the crank is otherwise damaged further, it should be able to be fixed for less than a replacement crank.

 

[bama]

I have had good luck at a specialty crankshaft/machining shop. They charge me between $10-$15 for straightening plus shipping. I have had to straighten quite a few of the old Jonsereds I have acquired. Must have been too many tight chains. I also learned the hard way that you can bend them by using the crankcase halves to press the crank into place.

 

[deezulsmoke]

Dial Indicator and a press We have actually done this with parts on the combine before, but it might be more critical with a part that small, you can get it within a few thousandths or better if you keep checking with a dial indicator. On a crank you might need to be tighter than a few thousandths though.

 

[bama]

The guy that does mine wants it less than three thousandths or else he doesn't want me to use it in a saw. He has been able to get all but one of them to around one thousandth. I don't know if that is too cautious, but I trust him.

 

[PES+]

That is an absolute maximum for tolerance I'd question a guy that only charge 10 to 15 to true a crank because it takes time and can get fidgety

 

[Lakeside53]

I'd ditch the crank (the 036 crank is electrically welded after assembly).. but FIRST check that your problem isn't a colapsed bearing on the clutch side... I've been caught before with this... 036 cranks are not expensive used.. lots around..

Also, old versions of the 036 and 034 did not have a steel inserts in the clutch side of the case. The mag slogs out and the bearing moves... the movement is mirrorred to the flywheel side.

 

[RiverRat2]

I'd ditch the crank (the 036 crank is electrically welded after assembly).. but FIRST check that your problem isn't a colapsed bearing on the clutch side... I've been caught before with this... 036 cranks are not expensive used.. lots around..

Also, old versions of the 036 and 034 did not have a steel inserts in the clutch side of the case. The mag slogs out and the bearing moves... the movement is mirrorred to the flywheel side.

Lake if I get the serial # off of the saw can you let me know if it is early or late model??? cosmetically it is pretty clean and no cracked or broken plastic, it may be worth finding another used crank as you said. The boss said I could have it for 50 bucks if I really wanted it????? plus I'll pull it down to check the bearings out too

 

[bama]

That is an absolute maximum for tolerance I'd question a guy that only charge 10 to 15 to true a crank because it takes time and can get fidgety

I met the owner and we hit it off. He rebuilds many racing automobile and snowmobile engines and the outboard motors that need rebuilding from around the area get sent to him. He also likes the old tractors and stationary engines, so maybe I get a deal since we share the same interests. Remember, this is a pretty rural area and "Minnesota Nice" is not just a saying.

 

[PES+]

Ahh I see....i was not implying and I do know of Min ah so tah hospitality and such.....if he rebuilds snowmobile cranks he should have no problem even if that particular crank is pin welded. Not all 036 cranks that I have seen have been welded

 

[bama]

Ahh I see....i was not implying and I do know of Min ah so tah hospitality and such.....if he rebuilds snowmobile cranks he should have no problem even if that particular crank is pin welded. Not all 036 cranks that I have seen have been welded

"Ya dere", not a problem, "don't ya know". Plenty of "off da's" up here. Although, we sound nothing like the movie "Fargo"!

 

[Grease monkey]

"Eh" Bama, hows da snow up der? Hope da ice is tick anuff for da shanty.
It be nice ta go to red lake der for da walleyes finaly .

 

[bama]

"Eh" Bama, hows da snow up der? Hope da ice is tick anuff for da shanty.
It be nice ta go to red lake der for da walleyes finaly .

I would love to get there to fish, but I am closer to Lake of Da Woods, so I either go there or Lake Bronson. I wish we had more snow. Only about 2-4 inches left!

 

[deezulsmoke]

ya'll and your northern accents :hmm3grin2orange: :hmm3grin2orange: I'm just kiddin with you all

 

[RiverRat2]

Hey Bama

Did not have time to pull the 036 down and check the bearings and pull the Crank out, but if they are good I may be interested in bama's bud giving it a shot at trueing it up if I cant find a decent used one reasonable,,, But I wont look into it until after Christmas,,, Which BTW MERRY CHRISTMAS Everybody!!!!!

 

[Lakeside53]

Lake if I get the serial # off of the saw can you let me know if it is early or late model??? cosmetically it is pretty clean and no cracked or broken plastic, it may be worth finding another used crank as you said. The boss said I could have it for 50 bucks if I really wanted it????? plus I'll pull it down to check the bearings out too

Sure... I'm sure I can scare up a crank for one. Everything fits; even the old 034 cranks.