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General Bobcat Skidsteer Forum
731with F2L511 Black smoke problems
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<blockquote data-quote="lecuyerb" data-source="post: 6327" data-attributes="member: 629"><p>Well I finally determined what was causing my problems on this yesterday. I had tried removing the injectors and running them outside and all looked fine so I started into more testing. The engine would not start at all and I was sure it was a diesel delivery problem - too much diesel causing the soot. Well after checking injector pressures I moved to compression tests - all with very special gauges I borrowed and one cyl was way down on pressure. I knew this engine had that problem as it used oil and had blue smoke at the rate of a quart every 3-4 hours of use. I thought it is time to do an inframe and fix the cyl leak. Well it only takes about 1.5 hours to tear the top end off the 511 and I had zero problems with doing it and parts would only be 2-300. After I got both cylinders off I spotted a problem the rear piston was cracked from the oil ring through the skirt. The cyl look fine no gouges or wear patterns I could see. Well I removed the piston from the rod and decided to remove the front piston from its rod. In doing this part I noticed the rear rod was dropping under the lip of the block when I rotated the crank to get the fron piston heigher so I held it up. After removing the front piston I rotated it so both were even. That is when I notice another problem the rear rod had 1/4 to 1/2 of play on the crank journal. I cant see yet but there can't be any bearing in there at this point. Long story short I left the block in the bobcat and started cleaning the other parts. I manged to disassemble the heads and wash and bead blast most everything from the top end. Today I will pull the block and tear it down and see if the crank is ruined and if the rod is gone too - I expect they both are gone for good. So anybody out there got a recommendation on where is the best place to buy parts? It seems the cheapest is ebat.de but getting the parts is a problem. I would love to find a used crank and rod. There is a crank on ebay for $300 but I think it is india not German? Anybody got a used f2l511 for sale? Before I buy parts I would put a good runner in there if I can find one. Brian</p></blockquote><p></p>
[QUOTE="lecuyerb, post: 6327, member: 629"] Well I finally determined what was causing my problems on this yesterday. I had tried removing the injectors and running them outside and all looked fine so I started into more testing. The engine would not start at all and I was sure it was a diesel delivery problem - too much diesel causing the soot. Well after checking injector pressures I moved to compression tests - all with very special gauges I borrowed and one cyl was way down on pressure. I knew this engine had that problem as it used oil and had blue smoke at the rate of a quart every 3-4 hours of use. I thought it is time to do an inframe and fix the cyl leak. Well it only takes about 1.5 hours to tear the top end off the 511 and I had zero problems with doing it and parts would only be 2-300. After I got both cylinders off I spotted a problem the rear piston was cracked from the oil ring through the skirt. The cyl look fine no gouges or wear patterns I could see. Well I removed the piston from the rod and decided to remove the front piston from its rod. In doing this part I noticed the rear rod was dropping under the lip of the block when I rotated the crank to get the fron piston heigher so I held it up. After removing the front piston I rotated it so both were even. That is when I notice another problem the rear rod had 1/4 to 1/2 of play on the crank journal. I cant see yet but there can't be any bearing in there at this point. Long story short I left the block in the bobcat and started cleaning the other parts. I manged to disassemble the heads and wash and bead blast most everything from the top end. Today I will pull the block and tear it down and see if the crank is ruined and if the rod is gone too - I expect they both are gone for good. So anybody out there got a recommendation on where is the best place to buy parts? It seems the cheapest is ebat.de but getting the parts is a problem. I would love to find a used crank and rod. There is a crank on ebay for $300 but I think it is india not German? Anybody got a used f2l511 for sale? Before I buy parts I would put a good runner in there if I can find one. Brian [/QUOTE]
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731with F2L511 Black smoke problems
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