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Author Topic: 550XP Failures  (Read 1408 times)

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Offline Jay Macdonald

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550XP Failures
« on: December 12, 2018, 10:53:09 AM »
Our organization purchased 250 550XP saws in 2016. They were put into service in 2018 and we have experienced multiple issues with starting, idling, hot starts and now we have multiple engine failures. We have disassembled four saws and found one common theme premature ring ware. As a result of the excessive end gap created 90 to 100 thousands we have what looks like crank problems resulting from blow by. None of the affected saws had more than ten hours run time. Has anyone experienced anything similar?


Offline bwstout

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Re: 550XP Failures
« Reply #1 on: December 12, 2018, 12:13:07 PM »
I bought one in 16 also and within a couple of months had the same issue ring collapsed and piston and jug scared. Put a new one on so for has been running ok but I don't use it as much now as before.
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Offline sawguy21

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Re: 550XP Failures
« Reply #2 on: December 12, 2018, 03:10:45 PM »
 What are you cutting and under what conditions? What oil and mix ratio are you using? The 550XP has been out for a while and overall has a good track record, all of a sudden one operator has multiple failures in a short time. headscratch
old age and treachery will always overcome youth and enthusiasm

Offline Jay Macdonald

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Re: 550XP Failures
« Reply #3 on: December 12, 2018, 04:35:46 PM »
The failures were from multiple locations under a variety of conditions. In all but one instance the only engine damage was the ring wear. All of the affected saws were built within a ten week time period. I will try and attach a picture of the ring

Offline DelawhereJoe

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Re: 550XP Failures
« Reply #4 on: December 12, 2018, 04:48:01 PM »
I used to drive a Kenworth, they had bad rings in them but would fail after it was out of warranty, they knew it too because it was sent out as a service advisory that the rings would fail sometime after 140k miles. Bad rings are out there and no matter who makes what engine the parts come from elsewhere.
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Offline sawguy21

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Re: 550XP Failures
« Reply #5 on: December 12, 2018, 04:59:08 PM »
Whose engine was in the Kenworth? Jay, it certainly sounds like a bad batch of rings from your description. I assume you notified Husqvarna and that they are on top of it.
old age and treachery will always overcome youth and enthusiasm

Offline barbender

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Re: 550XP Failures
« Reply #6 on: December 12, 2018, 06:02:52 PM »
Toyota had a recall a few years back over substandard rings. My mom's Camry got an engine overhaul at around 100K on Toyota for it. My dad always complained about the oil consumption up until that😊
Too many irons in the fire

Offline DelawhereJoe

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Re: 550XP Failures
« Reply #7 on: December 12, 2018, 06:54:01 PM »
I want to say it was a small 190hp Cat in it,  in a Kenworth T300
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Offline HolmenTree

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Re: 550XP Failures
« Reply #8 on: December 12, 2018, 08:29:58 PM »
The failures were from multiple locations under a variety of conditions. In all but one instance the only engine damage was the ring wear. All of the affected saws were built within a ten week time period. I will try and attach a picture of the ring
Post a serial # if you can. I had a brand new 2016 550XP that had a air leak causing a lean condition. 
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Offline sawguy21

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Re: 550XP Failures
« Reply #9 on: December 12, 2018, 10:18:56 PM »
He says there is no piston/cylinder damage which to me doesn't point to an air leak.
old age and treachery will always overcome youth and enthusiasm

Offline HolmenTree

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Re: 550XP Failures
« Reply #10 on: December 12, 2018, 11:05:46 PM »
Our organization purchased 250 550XP saws in 2016. They were put into service in 2018 and we have experienced multiple issues with starting, idling, hot starts and now we have multiple engine failures. We have disassembled four saws and found one common theme premature ring ware. As a result of the excessive end gap created 90 to 100 thousands we have what looks like crank problems resulting from blow by. None of the affected saws had more than ten hours run time. Has anyone experienced anything similar?
S
He says there is no piston/cylinder damage which to me doesn't point to an air leak.


sawguy21, I think you missed his original post...multiple engine failures with excessive ring wear under 10 hrs of operation. Crank failures ( can't just blame blow by on that, but blow by can be considered a air leak)
Piston ring grooves can be damaged from excessive ring wear.
Also bad idle, hard start....sounds like a  air leak somewhere.
Making a living with a saw since age 16.

Offline Jay Macdonald

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Re: 550XP Failures
« Reply #11 on: December 13, 2018, 04:42:25 PM »
There was one complete piston failure that was had a crank seal leak that was found during the leak down test. The other saws have evidence of excessive blow buy at the ring pin.
 

Offline John Mc

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Re: 550XP Failures
« Reply #12 on: December 16, 2018, 08:40:03 PM »
Our organization purchased 250 550XP saws in 2016. They were put into service in 2018 and we have experienced multiple issues with starting, idling, hot starts and now we have multiple engine failures. We have disassembled four saws and found one common theme premature ring ware. As a result of the excessive end gap created 90 to 100 thousands we have what looks like crank problems resulting from blow by. None of the affected saws had more than ten hours run time. Has anyone experienced anything similar?
Jay - what is your organization?
If the only tool you have is a hammer, you tend to see every problem as a nail.   - Abraham Maslow

Offline sawdusty1

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Re: 550XP Failures
« Reply #13 on: December 20, 2018, 03:59:47 AM »
His organization is Husqvarna product bashing and defamation Inc.
Woodmizer LT15
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Husqvarna 372xp
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Offline John Mc

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Re: 550XP Failures
« Reply #14 on: December 20, 2018, 07:00:22 AM »
His organization is Husqvarna product bashing and defamation Inc.
I was kind of wondering that myself, but was giving the benefit of a doubt until I heard more. Must be an interesting operation to buy 250 saws - likely all bought at once, since they were all made within a 10 week time period - then lets them sit for a couple of years before they put them into service.
Maybe it did happen. Some of the early 550XPs had some teething pains, but I'd certainly like to know more.
If the only tool you have is a hammer, you tend to see every problem as a nail.   - Abraham Maslow

Offline HolmenTree

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Re: 550XP Failures
« Reply #15 on: December 20, 2018, 07:12:59 AM »
I was wondering the same . Three posts and left the building.
 250 saws is one big order all at once, I like to know what organization this is and more information on the fuel mix for rings to wear that bad over a few hours.
Making a living with a saw since age 16.


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