Author Topic: 371xp not running  (Read 1410 times)

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Offline KilliansRedLeo

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Re: 371xp not running
« Reply #10 on: February 14, 2014, 07:13:28 am »
Looking4firewood, it is pretty tough to estimate what your saw would need to get it running again without seeing it. Sometimes damaged cylinders and pistons can be repaired sometimes not. If as you say, it will not turn over that is not a good sign. First task would be to remove the muffler and have a look at the piston as 660Magnum suggested. It is not a big deal to do this, you must remove four screws and loosen two others. You will need a 3/8 ratchet and two long reach Allen sockets (4mm & 5mm). I will post a couple pictures for you later in the day. Since you already have the spark plug out it might not be a bad idea to put a little penetrating oil in the cylinder to see if it will free up the piston. Did the person you loaned the saw to say how long he had run the saw before it stopped? Better yet, did he refill the tank just before it started smoking and stopped?
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

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Offline KilliansRedLeo

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Re: 371xp not running
« Reply #11 on: February 14, 2014, 07:31:32 am »
In an attempt to put what Countryhog was saying into perspective; the OEM cylinder and piston for a 371XP (Husqvarna part 503 93 93-72) retails for $300.92 for the bare parts. Aftermarket parts like Italian made Meteor $150.00 and some of the better Chinese ones $125.00. There would also be other minor parts needed, gaskets, spark plug etc.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline KilliansRedLeo

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Re: 371xp not running
« Reply #12 on: February 14, 2014, 08:44:12 am »
Perhaps there is another way to figure out what may have happened before pulling the muffler. If as 660 and I both suspect the saw was raw gassed. If there is still fuel in the tank you could pour a small amount in a kitty food can and let it evaporate. If there is no mix oil left in the can after the gas evaporates off then chances are that the saw was fed improper fuel. If there is oil left in the can then we pull the muffler to have a look, because it is possible that the wrong amount of oil was added to the gas. If after pulling the muffler the piston does not look as 660 described then we need to look further.

Before attempting any sort of repair you must first figure out just what caused the saw to fail. It is after all, a 1998 16 year old saw. There are lots of other things that can cause the sort of situation you are dealing with; failed bearing, seals, air leaks in the intake tract etc. The repair must not only cure the resultant damage, it must also address the cause. Otherwise it will happen again.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline looking4firewood

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Re: 371xp not running
« Reply #13 on: February 14, 2014, 09:08:31 am »
KRL, I'll check the gas, but I don't think that is the problem (unfortunately).  I treat all of my gas, whether it's for the mower or the saws/blower with StaBil, and for the saws and blower I use Stihl oil oil for the mix.  I mix up a fresh gallon about every 6-8 weeks.  Thanks for the suggestions for finding the root cause of this.

Offline KilliansRedLeo

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Re: 371xp not running
« Reply #14 on: February 14, 2014, 09:20:15 am »

OK Here is the picture I promised on how to remove the muffler. So, given our email discussion you should probably skip the gas test and pull the muffler. I forgot to caption the two 5mm bolts to be removed also.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline KilliansRedLeo

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Re: 371xp not running
« Reply #15 on: February 14, 2014, 10:05:56 am »
Looking4Firewood, have a look at the first post in this thread and download the second file, it will help you understand what you are seeing when you remove the muffler to have a look at the piston.

http://chainsawrepair.createaforum.com/ported-saws/piston-failure-analysis/

If you can it wouldn't hurt to post a picture of what you see through the exhaust port that way we can all have a look.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline eriksat1

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Re: 371xp not running
« Reply #16 on: February 14, 2014, 10:49:56 am »
Don't jump to conclusions. Maybe the guy put bar oil in the gas tank? Unless it is seized up I just reread you can't pull.

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Offline KilliansRedLeo

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Re: 371xp not running
« Reply #17 on: February 14, 2014, 11:37:21 am »
LOL, I have actually seen that happen sounds stupid but obviously you have also seen it! I had a private conversation with him via e-mail, I think that something else is going on. Given his description of the symptoms on his last use and just prior to the saw quiting it sounds more like an air leak that caused a too lean condition or a bearing let go in the bottom end. See his comments below. Tell me what you think.

Quote
Anyway, the last couple of times that I used the saw for an extended period of time, I noticed a little smoke coming off the engine, figured it was bar oil on the engine. As for the gas, I always use Stihl oil in the gas mix. Last week I had a tree service cut down some pine trees close to the house (Ice storm approaching), they do the tree work, I do the clean up (for a better price). The last tree they dropped landed on their rope, so they needed to cut the tree off it. He borrowed the saw that I was using for the clean up, told me that I should change the chain. I left for a couple of minutes to get a sharp chain, came back and he told me that my saw wasn't working, and now my story is published here.

Given the above the saw is stuck solid so it could be seized up from an extreme lean out condition or a catastrophic bearing failure in the bottom end; where parts of the bearing are interfering with the crank. If the saw came to a sudden violent stop the crank halves could also be twisted at the pin.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline eriksat1

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Re: 371xp not running
« Reply #18 on: February 14, 2014, 05:55:18 pm »
Ya if spark plug is out of it and take start recoil off, and if you can't turn the flywheel by hand at all you got problems. may now just have a parts saw.

Offline KilliansRedLeo

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Re: 371xp not running
« Reply #19 on: February 14, 2014, 06:11:20 pm »
Ya if spark plug is out of it and take start recoil off, and if you can't turn the flywheel by hand at all you got problems. may now just have a parts saw.

That is exactly what I'm afraid of. It is possible to rebuild the saw but you can't know for sure if it is worth rebuilding until the saw is taken apart. Especially if there is damage to the crank or the cases. If that is the case then the cost to repair/rebuild in parts alone, even used parts would rapidly approach the value of the saw. Might actually be better off looking for a parts saw with a good bottom end and start there.

KRL
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

 

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