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Generator engine

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chris in MD

12-20-2002 14:56:37




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As it so happens, a small (4400 watts), 8HP briggs generator has landed in my shop, it was given to me. It is a nice generator, with electric start, and I would like to get it running, but it seems like the engine is seized. Do you guys have any tips on freeing up the engine, or will I have to get another one? I took the head off and filled the cylinder and one open valve (exhaust) with oil, and the piston is about 1/2" from TDC. I don't really know what else to do, except maybe tap on the piston with a mallet, or what? Sorry for the long post, I just hope I can get the engine freed up. Tell me what you think.
Thanks,
Chris

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Fred OH

12-25-2002 09:51:14




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 Re: generator engine in reply to chris in MD, 12-20-2002 14:56:37  
Chris, Once upon a time, I had a buddy that was as tight as the bark on a tree....and all the guys in our crowd would just love to get in his wallet. He used to brag when he GOT in ours. Then one day, he brought a riding mower around and gave it to me cause it was froze up. As soon as he left, I got a pipe wrench out and put it on the crankshaft behind the pulley and beared down on it a little and it broke loose easily. I then traded it for a Yaesu 101 EE ham radio and sold it to him for $275. Told all the guys about it and let it get back to him that way. If my old buddy hadn't died, I'd still be on the lookout for a gouge from him. I sure wish he was still alive....he kept everybody on alert. A good way to be in this day and age. L8R....Fred OH

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Jack

12-21-2002 16:09:47




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 Re: generator engine in reply to chris in MD, 12-20-2002 14:56:37  
Chris: A point in passing. Make sure the outlet you installed in heavy enough capacity. If you look, you'll probably find it's a 20 amp outlet as opposed to a standard 15A used in a home. Jack



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chris in MD

12-21-2002 13:17:32




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 Re: generator engine in reply to chris in MD, 12-20-2002 14:56:37  
Thanks guys for your responses. I had oil soaking in the piston overnight and today I put a large washer on top of the piston, used a 1x1 on top of that, and tapped it with my hammer. Luckily the engine was only lightly seized because with a few hits, it started creeping down and then I was able to use a screwdriver on the flywheel fan blades to work it loose. Used all sorts of oil, spray bolt loosener, etc in the cylinder, kept turning the flywheel back and forth, and eventually it loosened up enough that the starter (with a charged battery) would turn it over. I put the head back on, got a new spark plug and fuel filter, tightened everything up, changed the oil, and started it up. This is the first time I have dealt with a stuck engine, so I was happy when, after it coughed all of the oil and spray out, it fired right up! The generator part workes great, except for a cracked outlet, which I replaced with a regular wall outlet, fit right in. I wanted it to run for a while, so I put it outside and plugged my shop lights, radio, and tools into it, while I worked on another project. Thanks again for all of your help.
Thanks,
Chris

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Ben in KY

12-26-2002 09:33:52




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 Re: Re: generator engine in reply to chris in MD, 12-21-2002 13:17:32  
Chris, I would recommend changing the oil in the engine after running it for a bit to flush out any penetrating oil or rust particles that may have gotten into the crancase.



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TimC

12-21-2002 11:38:30




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 Re: generator engine in reply to chris in MD, 12-20-2002 14:56:37  
It seems to me since you took the head off and didn't mention rust then the motor is locked up because of a mechanical problem. If it is a syncro-balanced motor then you have a lot more stuff that needs to move around in there.

Take the oil plug(s) out and look around in there with a small pen light.



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Slowpoke

12-20-2002 15:59:09




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 Re: generator engine in reply to chris in MD, 12-20-2002 14:56:37  
DO NOT hit the piston directly with a mallet! It will break. Are you sure the starter is working ok? Remove starter and try turning flywheel by hand. For a small piston, use penetrating oil. Leave it sit for a while, then get a large heavy washer or similar item the size of the piston. Put it on top of the piston and use a wood 2x2 about 6-8" long between the washer and hammer. Then tap with the hammer. Have someone try to turn the flywheel at the same time to be sure it's not on TDC when you'r hitting the wood. If it is it won't move, even if it's not stuck.

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chris in MD

12-21-2002 04:01:21




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 Re: Re: generator engine in reply to Slowpoke , 12-20-2002 15:59:09  
Thanks for your reply, I will try that today. It seems like a good idea to me!
Thanks,
Chris



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