Destruction of the week / Blower engine failure analysis / Stihl BR800
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- Опубликовано: 26 янв 2024
- Today I tear down a BR 800 blower to inspect the engine damage after a major failure. This video is for entertainment purposes only. Thanks for watching.
#stihl #smallenginerepair #landscaping
Thank you, more videos.
Thanks Wollys Workin.
The first post immediately points out that it is a very high conical slightly oval wear of the upper cylinder liner zone. The black deposits are most likely magnetic and come from the upper cylinder wear zone, which also results in high bearing wear.
The disassembled engine with initially excessive piston pin wear, then piston eye breakage, followed by hard valve pin contact with subsequent cam drive gear breakage thus very probably points to a very smooth and good running unit in terms of operating technology but with rather poor fuel oil.
SJVD/MFM
Michael Frithjof Müller
Nice Vid, which oil do you like ? I use Stihl moto mix in all my Stihl stuff, what do you recomend in Echo equipment ?
You can use the moto in the echo if you want otherwise any name brand oil is ok. We really like VP for ethanol free can fuel also.
Maybe its the ethanol gas.. i haven't run it in any small engines or my car in many years ⛽
Hey Wally,
I had a very similar situation a couple of weeks ago. Customer brought in an 800 with a broken piston. I replaced it with a used OEM piston. I put about an hour on it and it was starting and running awesome. I gave it back to the customer and he said within two hours it broke the second piston. When I got it back, there was a lot of blackened fuel in the combustion chamber. Not sure what happened but kinda frustrating!
That is frustrating. I’ve replaced crankshafts with used ones and most of the time they would come back with the same problem. I quit rebuilding them years ago.
@@wallysworkin823
The crankshaft seemed to be in good shape and reusable.
I have a couple of suspicions…
The bosses that the cam gear and followers are pinned to can get hammered out. When I got the machine back, the exhaust rocker was off the valve stem. So, even though I was careful about the valve lash setting, maybe slack in the bosses caused the rocker to jump off.
My other suspicion, the fuel in the tank was a light green. I use Stihl Premium oil in my 800, it’s blue and I mix it 45:1. The mix in the tank didn’t look right.
Lot of time,labor fixing it but I would ordered a new motor from ebay,kept rolling,gotta use synthetic oil in them
Which backpack blower & weedeater you recommend?
I’m a fan of the Echo 9010 lately, it’s been holding up very well. Line trimmers, either Echo or Stihl