That would make you sick to feel that hit your boot. I know from personal experience the cross could cause that. I had one bolt break off as I tightened it. Once. Required a new thread cut. What you described all else equal and known sounds like bad bolts.
FarmerTec Huztl MS660 Updated Build Kit - Build Thread
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gchamber
ArboristSite Member
There has always been trouble with 56mm cylinder and you can see how those bolts got hammered.
The real problem now is damage to the crank bearing.
I hate that for you. You might want to order a case, crank and a 54mm cylinder.
The real problem now is damage to the crank bearing.
I hate that for you. You might want to order a case, crank and a 54mm cylinder.
gchamber
ArboristSite Member
What would cause damage to the crank bearing? And I'm not sure what you mean that I can see how the bolts got hammered.
I've got the 54mm cylinder from the kit. But I'd still need new cylinder bolts. I also just went back out to where I was cutting and found another bolt head. So it seems at least 2 of them were very recent
I've got the 54mm cylinder from the kit. But I'd still need new cylinder bolts. I also just went back out to where I was cutting and found another bolt head. So it seems at least 2 of them were very recent
gchamber
ArboristSite Member
I was able to turn the two headless bolts that were still in the case out and matched them to the two bolt heads I found. I haven't located the 4th bolt or bolt head so idk what happened to it. 
I am going to leave it at just that. It's hard tell excatly from a photo. Again sorry that happened to you. To be clear, I think there was pressure at the base that unseated the cylinder. I think that damaged your bearing. Again, that all I have to offer
gchamber
ArboristSite Member
Is there a way to tell if the bearing is bad? The piston still moves up and down freely. I would hate to order new parts unnecessarily.
Put your 54 on an plow ahead. Just remember if it does not last long. In my opinion common sense must be used. Those bolts are not made out of rice and it popped them off. The piston rides on those bearings. The piston movement caused the bolt failure if I were a betting g man.
I feel your pain, me saying order the parts was so you could put it behind you and enjoy your saw
MG porting
ArboristSite Guru
As Bedford T asked are you running a Cross cylinder? And if not you must be stronger than you think because that's how I lernt the hard way.
gchamber
ArboristSite Member
My best guesses would be the bolts being over torqued, or loose enough that the bolts were able to back themselves out over time to the point that it allowed the cylinder head to move up and down slightly and rapidly eventually breaking the head off the stud. Or just too much compression/displacement that the bolts weren't strong enough to keep the head down?
remember this? decisions made can have an adverse effect on your outcome. those bolts can tell you a lot. if it did not hurt you financially to bad, just learn from it.
those bolts broke, tore the heads off
gchamber
ArboristSite Member
I'm not sure what a cross cylinder is. Is that a brand? Everything I got from huztl plus the recommended OEM parts (wrist pin, circlips, gaskets, impulse line, manifold elbow)
gchamber
ArboristSite Member
I did squirt brake cleaner at my base gasket and didn't hear any discernible difference in idle.
Should those bolts have been retorqed after running the saw through its break in period?
If I run the 54mm piston and cylinder on this lower end, I'm aware now that there's a good chance the crank bearing is bad and would cause the saw to fail probably sooner rather than later. But if I was going to order a new case and crank anyway does it really matter if that bearing fails while running the 54mm as I wait 3 weeks for the parts to ship?
Is it just a bad idea to run the big bore kit? Is that the moral of the story here?
Should those bolts have been retorqed after running the saw through its break in period?
If I run the 54mm piston and cylinder on this lower end, I'm aware now that there's a good chance the crank bearing is bad and would cause the saw to fail probably sooner rather than later. But if I was going to order a new case and crank anyway does it really matter if that bearing fails while running the 54mm as I wait 3 weeks for the parts to ship?
Is it just a bad idea to run the big bore kit? Is that the moral of the story here?
MG porting
ArboristSite Guru
Do me a favor and take your piston off and put your cylinder back on and make sure that your transfor ports aren't hitting the case that can be something else to look at.
gchamber
ArboristSite Member
The transfer ports on the outside I'm guessing you mean? I can't imagine how the transfer ports would hit the case on the inside?
MG porting
ArboristSite Guru
Yes the outside sorry. Lol
I just tested the force required to break a farmertec bolt in a farmertec case and it's way higher than anything that can be generated by hand. I even tried to shear one with a 1/4 impact and couldn't do it.
There's way too many of these things on the street so I'm wagering that something is up with your assembly process. As mentioned, you need to check every step of the assembly before proceeding.
There's way too many of these things on the street so I'm wagering that something is up with your assembly process. As mentioned, you need to check every step of the assembly before proceeding.
gchamber
ArboristSite Member
That's not a fair test. You're not putting the bolt in tension the way it is holding the cylinder head down over the base gasket.
