Crankshaft big end bearing rebuild

[Shane¹]

I see several threads on crankshaft big end bearings making noise or saws needing a crankshaft. Has anyone put any effort into rebuilding cranks by changing big end bearing. I have done 1 in a dolmar just curious cranks can be expensive or nla just curious if anyone else has tried it.

 

[kneedeepinsaws]

Well from what I remember the husky ones are pressed into place. I took a cheap AM one at one point heated it and was able to separate it just to see if it’s possible. Thing is you will need to press it back on in which both crank lobes are lined up perfectly… also, where are you going to find the actual bearing? Most mfrs list the crank as a complete assembly and do not list any parts of it seperately

 

[Shane¹]

Well from what I remember the husky ones are pressed into place. I took a cheap AM one at one point heated it and was able to separate it just to see if it’s possible. Thing is you will need to press it back on in which both crank lobes are lined up perfectly… also, where are you going to find the actual bearing? Most mfrs list the crank as a complete assembly and do not list any parts of it seperately

I was able to find a bearing for mine in a kit for a Stihl 08 and was able to true it up after pressing it back together. There is not a lot of info out there on it but I just figured with all the people on this site there has to be a way to see what cranks take what bearing.

 

[Shane¹]

Here is how I trued mine up using this home made stand

 

[kneedeepinsaws]

Good info

I now remember what happened when I got my AM crank. It was too wide, cases wouldn’t close all the way when I re assembled. Compared the old and the New crank and found the new one wasn’t pressed in all the way. So I tried to do it myself with a vice and heat. I did press it in more but it was too much at the big end of the rod was rubbing on the cranks now, so I tossed it and bought oem.
save yourself the hassle and compare your old and new with calliper a before you install!!!

 

[davidwyby]

I suspect the rod is stretched in my case.

 

[Shane¹]

I suspect the rod is stretched in my case.

If you could find the bearing it may be worth trying it worst you would be out a bearing and case gasket to put it back together

 

[kneedeepinsaws]

If you could find the bearing it may be worth trying it worst you would be out a bearing and case gasket to put it back together

This is what motivated me to proceed
If I could do it again I would shim it so that I could not go to far pressing it

 

[Lee H]

I had a few Sachs Dolmar 166 cranks with various issues, I sent them all to a place in Vermont called The Crank Shop.
They were able to get me 3 cranks out of what i sent them although i had to do the leg work on finding the lower rod
bearing which i was able to get from Action bearing in Boston Ma.

 

[isaaccarlson]

I suspect the rod is stretched in my case.

I've never heard of a stretched 2 stroke rod. The rod is always under compression in a 2 stroke. That's why you can remove material around the pin when porting.

 

[Shane¹]

This site shows quite a few different bearings with specs. Then you can usually buy them from everest parts and supplies or Amazon and eBay even. https://www.con-rods.com/two-stroke-engine.htm

 

[Lee H]

This site shows quite a few different bearings with specs. Then you can usually buy them from everest parts and supplies or Amazon and eBay even. https://www.con-rods.com/two-stroke-engine.htm

That is great info for us guys with old saws

 

[Ketchup]

Anyone try this?

Proline® Crankshaft Connecting Rod For Husqvarna 285 298 1100 2100 Chainsaw | eBay

This kit is Not made in China. Replaces Husqvarna OEM # Connecting rod.

www.ebay.com

 

[Shane¹]

Not tried that one before but I have used an Everest parts and supplies one with success

 

[isaaccarlson]

I just got a 20 ton shop press, so I might try separating a junk crank.

 

[stumpyfine]

I have done a couple with no problems, got alignment to 1/2 thou. One was an 044 10mm had a GDT0244 14.4X20.4X10MM bearing I got from https://www.ebay.com/itm/3535082557...XS09ehQXC&var=&widget_ver=artemis&media=EMAIL