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Old 04-17-2012, 03:58 AM   #1 (permalink)
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Question how to make a right diagnostic for seized motor?

Hi everybody!I need your advise,plz.I heritated "Rancher 350" 2004 with seized motor,what should i do before tearing a motor a-part?When i puling a string of starter,crank is moving a litle bit (1-2 INCH),so my "?" is-what is stuck:top end,bottom end or transmition? Thanks for any opinion!
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Old 04-17-2012, 07:23 AM   #2 (permalink)
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Welcome to the forums. Someone will come along soon who has rebuilt many of the older four stroke engines..One person comes to mind who just did a complete rebuild on one.. I myself have torn down many an older two stroke engine for top ends, and splt cases for bottom ends that were bad, but they would still turn over fine,,not recommended though,lol! I would get the machine up in the air first and check and make sure that nothing is froze in the drivetrain first, and check for being able to shift the machine into neutral to let the wheels turn to take that off my list, even go as far to having a known good battery in the machine so it will light up the neutral light to help diagnose the issue. Then go to the top end from there would be how I would do it. Any top end that I ever had a meltdown with I could still turn over, it was just scuffed in the cylinder, or a hole in the piston that caused the issue. I've had bad crank bearings also where the engine would still turn also so I would start with what I suggested, unless someone who has worked on these allot has another suggestion. If the piston were actually stuck in the bore from sitting a long time and possibly rusted tight, it could be tough to get the cylinder off. I would get some oil down into the cylinder through the plug hole in the meantime. Good luck.
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Old 04-17-2012, 09:56 AM   #3 (permalink)
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Thank you,"stu5969" for quick response."Neutral" light is "on" ,and transmission shifting manually to "Neutral" easy.ATV rolls easy.Most likely transmission is OK.What do you think,would be wise to get a special scope to look inside of cylinder for rust?I have been told to drain oil from crank case and see,if there is any sign of metal from bearing wear. Thanks again.
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Old 04-17-2012, 10:57 AM   #4 (permalink)
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i think stu is talking about me..in front of my back !..lmfaooooooo..pull the top end off the motor bro..if the piston is not seized ?..it will turn over when you pull the start rope. let us know how it goes ?. then we'll take it from there.
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Old 04-17-2012, 10:59 AM   #5 (permalink)
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another way to check it..remove the pull rope from the back of the motor..( yes..it's a bit__h to get to ! )..17mm socket on the crank bolt..turn it clockwise..if you can turn it a good ways ?..then your piston is fine..it's probally hitting a bent or broken valve ?...this will keep you from turning the motor over by hand all the way around.
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Old 04-17-2012, 11:00 AM   #6 (permalink)
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too sum it up ?..there are a few reasons a motor will not turn all the way over..sooo..start with the easy stuff..before you go tearing the motor out of the frame.
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Old 04-17-2012, 11:03 AM   #7 (permalink)
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Quote:
Originally Posted by silka View Post
Thank you,"stu5969" for quick response."Neutral" light is "on" ,and transmission shifting manually to "Neutral" easy.ATV rolls easy.Most likely transmission is OK.What do you think,would be wise to get a special scope to look inside of cylinder for rust?I have been told to drain oil from crank case and see,if there is any sign of metal from bearing wear. Thanks again.
don't know who told you too drain the oil from the crank case ?????????..buttttttt..they are full of it !!.lmfaooo..no need to drain your oil..just to see what your piston looks like !!!..lol..remove the top end ..( the rocker box and head for now )..do what i said with the pull rope..if you can pull the rope...but only so far ????..then i'd say your piston is hitting a bad valve !.
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Old 04-17-2012, 11:05 AM   #8 (permalink)
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it's alittle long...long..but well worth the look..it's my rebuild stu was talking about....my complete tear down and rebuild of my '04 trx350 4x4 rancher. '04 trx350fm rancher project <-- and that's a short version of one rebuild i've done !.lmfao.
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Old 04-17-2012, 05:39 PM   #9 (permalink)
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Thank you guys for your opinion,looks like i need to take off the head first.i will let you know of any up-date.
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Old 04-17-2012, 07:25 PM   #10 (permalink)
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Quote:
Originally Posted by silka View Post
Thank you guys for your opinion,looks like i need to take off the head first.i will let you know of any up-date.
your welcome.
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