B&S crankshaft spalled

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  #1  
Old 05-06-09, 05:26 PM
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B&S crankshaft spalled

A friend was running his 6hp B&S pressure washer the other day. We checked the oil and gas, and all was fine and full. After running for several hours off and on between fueling and oil checking (probably 6 hours total), it locked up. Checked the oil, MT. No leaks, no smoke, just no oil and locked up. We pulled the engine apart. Piston moved freely, crank was quite hard to turn. Had to turn it to a loose position in order to tap it out. Totally spalled, both shaft and casting. Is this repairable? I need MY pressure washer back before he locks mine up.
 
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  #2  
Old 05-06-09, 07:01 PM
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Which bearing surface is damaged, upper or lower? If upper, it usually means oil level was not properly maintained, very dirty oil, or the machine was tipped while running.
 
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Old 05-07-09, 02:56 AM
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Upper, and obviously. Is it repairable?
 
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Old 05-07-09, 06:54 AM
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Repairable? Yes. You need a new crankshaft and rod, new gasket and oil seals. I would recomend finding out where the oil went before putting any $$$ into this engine. You said you checked the oil before starting, no smoke, no leaks, and then 6 hours later, no oil. Sounds strange. You may want to look into a new engine for what the parts are going to cost.

Briggs Engine Search by Small Engine Warehouse
 
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Old 05-07-09, 10:14 AM
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Not obviously, chandler! First, you said, not, whether you have a horizontal or vertical crank engine. Secondly, the lower bearing can and will seize before the upper bearing in vertical crankshaft engines in certain circumstances. Now that I've scolded you, you need to be concerned that the bearing surfaces are worn beyond repair, if reparable or replaceable. You need to supply us with engine ID numbers before we can advise you of any possible repairs or any possible replacement parts availability. You'll want to measure all critical bearing areas and their mating parts for proper specs, for which you'll need to consult a repair manual for these figures.
 
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Old 05-07-09, 11:33 AM
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Yeah, I think , obviously was a good response. Either the oil level was not maintained, it was dirty (not), or the machine was tipped (don't know, really). It is a vertical on a pressure washer. The lower bushing or casting (no bearing) was not harmed. The upper bushing or casting (no bearing) was the problem. I'm too old and mean to be scolded by anyone, but thanks anyway. The only numbers he could find were on the metal recoil cover and are 12H812-2324-01-03072957. Since he has mine, I can't go look where the numbers are. If you have a better hiding place, let me know and I will tell him to look. My concern IS whether or not the surfaces are repairable. There are no replaceable pieces that I can see. If I have to go to all the trouble of buying an oversized shaft and mill down the existing surfaces on the motor, it probably would be best to buy a new engine.<link rel="File-List" href="file:///C:%5CDOCUME%7E1%5CLARRYC%7E1%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_filelist.xml"><!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <ooNotRelyOnCSS/> </o:OfficeDocumentSettings> </xml><![endif]--><link rel="themeData" href="file:///C:%5CDOCUME%7E1%5CLARRYC%7E1%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_themedata.thmx"><link rel="colorSchemeMapping" href="file:///C:%5CDOCUME%7E1%5CLARRYC%7E1%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_colorschememapping.xml"><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> 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Last edited by chandler; 05-07-09 at 01:50 PM.
  #7  
Old 05-07-09, 12:42 PM
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Those are the numbers we need! There is no such thing as an oversized crankshaft so, provided the magneto end crank journal is within spec (.875"-.873") and the mating bearing surface is no larger than .878" (once honed smoothly) then you won't have to replace anything. If the crank is out of spec then you would have to replace the crank and if the bearing is out of spec then you'd have to replace the cylinder. A new engine, Briggs part number 126T02-0005 is available but with this engine you have to remove the provided crankshaft & sump pan and replace them with the proper crank & sump. In other words, Briggs does not spec out an exact replacement engine for your application.
 
  #8  
Old 05-07-09, 01:47 PM
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Great information. I'll pass it along to him. Maybe he can get his going. He is an industrial engineer and draws plans for machines that make paint cans, so I think he can mic it without my help. Have a good weekend!
 
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