Ok what is up with all the 372 pto bearing failures. A good friend has had 4 of em fail in the last year. I was going to pick one up but my dealer also said to stay clear. What did Husky just have to screw up one of the best saws going or was it a bad batch of bearings? I hope? I understand the more oil thing helps but for years and about 10+ 272's and 372's there was never a issue. So something is up. CJ
NEW 372 FAILURES
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Take a saw that already needs more oil than 50:1, give it less oil through the use of strato, and voila.
Chris-PA
Where the Wild Things Are
Comparing strato to non strato, in the crankcase strato should result in less oil volume flowing through the case per unit time, but the quantity of oil in the case at any given time will be much higher. You have a much richer mixture moving more slowly.
EDIT: Forget that, it's wrong. Need to give it more thought.
Termite
Time To Launch
Here is a thread about 372 bearings.
http://www.arboristsite.com/community/threads/576-xp-any-good.226122/#post-4124649
Maybe some of the Husky dealers have an update on the situation?
http://www.arboristsite.com/community/threads/576-xp-any-good.226122/#post-4124649
Maybe some of the Husky dealers have an update on the situation?
zogger
Tree Freak
I thought the fuel and oil mixture would be less with the strato? So you have a saw turning the same RPMs as the non strato but with less cooling down below?
jwilly
ArboristSite Operative
Very aggressive chains can also cause bearing and/or crank failures. My son used to cut the depth gauges down too far and had several failures, mechanic said use a gauge, no problems since.
Hedgerow
HACK
TK just told everyone what the problem was...
He's a dealer...
Chris-PA
Where the Wild Things Are
From TK's comment it seems like this was just a typical mfg defect, the stuff that happens so easily.
As for the strato, there will be less fuel mix moving through the case, by however much less is lost to scavenging. So if the strato is, say 15% more efficient then there will be that much less mix going through the case. There is a lot less air moving through the case, but that should not be relevant here - all the fuel mix still goes through the case.
zogger
Tree Freak
Can't have it both ways, near as I see it. 15% less fuel mix (the liquid part) going through the case means 15% less lube and cooling, yes? So it should be relevant? Take the bearing mis install off the table, all things equal in this hypothetical, the non strato will have better internal cooling, but the strato gets better mileage/less pollution.
Hedgerow
HACK
Less fuel moving through the case = less fuel moving through the case...
Lubrication shouldn't suffer too badly, but cooling ???
It's good food for thought...
Lubrication shouldn't suffer too badly, but cooling ???
It's good food for thought...
zogger
Tree Freak
The way I was looking at it..we'll stick with 15% better mileage/efficiency, this means a tank will last 15% longer. This is the only way to show it is more efficient that I can see. So, per single revolution, that is 15% less fuel/oil mix hitting the crank bearings.
Chris-PA
Where the Wild Things Are
What I meant was that the reduced air moving through the case is probably not relevant here. There is still about the same amount of air moving through the engine, it just flows through a different path. So as far as strato goes it is just different, but there's still pretty similar amounts of fuel mix in the case, and fresh air moving through the strato air valve and across the piston probably helps cool the upper cylinder.
Anyway, there does not seem to be a history of lube or cooling problems with strato engines, and there are a lot of them out there for some 10 years now. Especially when the bearings are pressed in correctly!
Termite
Time To Launch
Sorry, I wasn't paying attention.
Hedgerow
HACK
No sweat...
Just wanted to let everyone know TK been dealing with the factory on this one a while...
"Off forum"
Most are fine, but he's seen enough to know sumthin was up, and started asking questions of the manufacturer...
Which is what good servicing dealers are supposed to do... Hopefully they remedied the problem quickly..
Termite
Time To Launch
TK is one of the good guys. 
How can a bearing be crooked in a press fit bore, especially enough to destroy the bearing? More info would be helpful.
Thanks TK, I don't know what to do other than either wait until it gets fixed [hopefully] or find a NOS saw somewhere. That will be hard esp in the G model. One friend has switched to the 576 for the time being and the other one won't switch. So it looks like I will be looking for 2 saws. CJ
Termite
Time To Launch
It can happen. I've done it but not on a chainsaw.
I know you can get them started crooked. But to be seated and still crooked? Seems to me that you'd have to ruin the case to do that.
