Gallery, Projects and General > How do I??

Help/advice needed with Honda GC160 engine

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Spurry:
I have one of these engines fitted to my power washer. I understand many portable machines can utilise this motor too. Long story short. Started the washer and the motor seized solid after a couple of minutes. Oil level was fine.
Removed and stripped down the engine to find that the crankshaft had picked up on the crankcase bearing surface area. It is a four-stroke engine which depends for lubrication on oil being sloshed about by a small finger on the big-end shell. As the washer is used infrequently I guess the oil had all drained off the crank.
I have polished the crank with impregnated diamond tape (beloved of plumbers) and the evidence of pick-up is gone. I am not sure what to do with the crankcase though. There are no bearings only the line-bored cases.
Has anyone had to deal with such an instance, and could offer any advice?
Thanks
Pete

hermetic:
Hi spurry, unusual failure on what is usually a very reliable engine, no reason you cannot bore it out and put a pb bush in it, providing there is enough meat there to support it. but look carefully, if there was sufficient oil in it, there is another problem, like a blocked oil hole, or some other reason for a seize up. is the engine very old or well used?

phil

Spurry:
Thanks for the reply Phil. I think the motor dates from 2002, but I doubt it's been used more than a dozen times. It's spotless inside and out. Although the oil was quite clean and up to level, not sure when (if) it was changed. :scratch:
I will have a good look round for any blocked holes or other cause, but am at a bit of a loss at the mo.
Pete

Sid_Vicious:
From what I've seen poking around on the net, newer versions have ballbearings in the housing. How is the condition on the surfaces on the linebored bore? It should be possible to bore it up and put in a bushing of another metal. Some of the "experts" said to don't use sandpaper or like it on the crank but to use battery acid to dissolve the alu that have welded it self to the crank because of the heat.

Spurry:
Appreciate the reply. Unfortunately I have already cleaned the crankshaft. There were only a couple of small spots of aluminium on the shaft which polished off quite easily. It's a bit difficult to be subjective on the crankcase, and it's very awkward to try and photograph.
Pete

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