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
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
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.
