neil 2,410 #1 Posted January 21, 2011 I have a Kohler k91 that i think is seized , what i would like to know is how difficult would it be to rebuild and also would it be costly. the engine seems to all be intact , its just that i will not turn over in any way also where can i get a manual thanks for your help in advance Neil Share this post Link to post Share on other sites
camaross 0 #2 Posted January 21, 2011 make sure the starter gear isn't jammed up in the flywheel? Share this post Link to post Share on other sites
neil 2,410 #3 Posted January 21, 2011 how do i get to the starter gear. the guy i bought this engine off said it was 100 % working and i would like to trust his word and i hope he proves me wrong and it is not seized Share this post Link to post Share on other sites
camaross 0 #4 Posted January 21, 2011 unhook the battery , then loosen any bolts that hold the starter to the block and any wires connected to the starter you should be able to remove the starter chcek to see where the gear is and if it moves freely also check to see if the motor rotates Share this post Link to post Share on other sites
Buzz 502 #5 Posted January 21, 2011 The 4 hp K91 shouldn't have an electric starter. What tractor is it out of or what tractor do you plan on installing it? Have you pulled the spark plug and tried turning it over? Here's the Kohler service manual that might be helpful: http://www.kohlerengines.com/onlinecatalog/pdf/tp_2379.pdf 2 Share this post Link to post Share on other sites
dgjks6 8 #6 Posted January 21, 2011 I am a novice to the entire engine rebuild process, but I am always ready to give an opinion, so take it for what it is worth. First I would remove the pieces necessary to get to the flywheel. then I would remove the spark plug. Then you sould be able to turn the flywhhel by hand. You can also try to turn the PTO side if there is a pulley on it. This is easy if there is a pully, but can be hard if there is not. As far as a rebuild. hmm. Ny quick ebay seach does not show any pre made k91 rebuild kits, so you may have to get each piece individually which can get expensive. Also, the block would need to be machined. I would guess b/n $300-400 to get it rebuilt if you did the work. Share this post Link to post Share on other sites
VinsRJ 723 #7 Posted January 22, 2011 K91's are fairly simple to work on. The vast majority were recoil start but there were some with a electric start (starter generator). As mentioned above I would first pull the plug..... mix a little 50/50 of ATF tranny fluid and acetone together and poor it into the bore, let it sit at least over night. If after a couple days soke time this doesn't free it up, pull the head and oil pan and take a look inside. Do not force it free with out looking in side the motor, I've had Clinton motors with stuck valves holding everything up. Share this post Link to post Share on other sites
Don1977 605 #8 Posted January 22, 2011 If it's been setting for a long time the rings may be stuck. You can take the Recoil Starter off and if it still doesn't turn try pulling some light oil in the spark plug hole and let it soak. It might free it up, something to try before you take it all apart. Share this post Link to post Share on other sites
Kelly 1,033 #9 Posted January 22, 2011 I'm finding more and more engines that sat out in the weather and not used, the valves seize up in them, just a thought, I've had many that way, some I pull the head and a little oil on the valve if open, and very gently tap it with a hammer, some free up others don't. Share this post Link to post Share on other sites
neil 2,410 #10 Posted January 22, 2011 Hi thanks for your your advice . This is the engine in question It looks to be in quite good condition but that doesnt say that there isnt a problem. why was the guy selling it i should ask myself. I bought this off that auction site and the guy says it was 100% a good runner i payed about $100 but about 1 Share this post Link to post Share on other sites
AMC RULES 37,211 #11 Posted August 31, 2013 Any updates...did you ever get it to turn over Neil? Share this post Link to post Share on other sites
