Yongheng Fail: crank arm shred and a warrantee nightmare

[steeve]

The only thing that the "dipper" tang can hit is oil. They state that you should not over fill the crankcase.... I suspect that too much oil creates enough resistance at the relatively high operating RPMs, to work-harden the dipper tang from the harmonics, to a point where it can eventually break off. Just a thought for the rest of us YH owners. Another point is that the #46 Hydraulic oil recommended, is not the best lube for this rod bearing/crank pin combo. I think they use it for it's high pressure combustibility resistence....a safety factor. there are much better lubricants that may work better in this application. anyone tried a different lube? 
Finally, I just bought my second YH pump...(lost the first in my recent house fire, with less than 10 minutes run time on it.) I did not receive any instructions on what batteries to get for the temp gauge, and forgot which ones I used on the first unit. Anyone know?

 

[Eaglebeak]

"steeve"The only thing that the "dipper" tang can hit is oil. They state that you should not over fill the crankcase.... I suspect that too much oil creates enough resistance at the relatively high operating RPMs, to work-harden the dipper tang from the harmonics, to a point where it can eventually break off. Just a thought for the rest of us YH owners. Another point is that the #46 Hydraulic oil recommended, is not the best lube for this rod bearing/crank pin combo. I think they use it for it's high pressure combustibility resistence....a safety factor. there are much better lubricants that may work better in this application. anyone tried a different lube? 
Finally, I just bought my second YH pump...(lost the first in my recent house fire, with less than 10 minutes run time on it.) I did not receive any instructions on what batteries to get for the temp gauge, and forgot which ones I used on the first unit. Anyone know?

AG13 !.5V or LR44 Button cells

 

[Bluecup]

Hello flex,

The allen head bolt that holds the crank on the yong heng is a left handed thread, clockwise to loosen and counter clockwise to tighten. I am going through the same problem with the oil slinger on the bottom of the rod breaking and the rod siezed to the crank. Somethings I have discoverd so far is that you will need a wheel puller to get the crank off the shaft after you get the bolt loose. I found that Aliexpress sells a bunch of differant size rods, I used a digital calber to measure the rod and orderd the one I needed for my unit.I only located one crank replacement but it did not give the dimensions I will find out if it fits when I get it. Good luck with the rebuild it sounds like you need some. Please let us know how you make out.