I've been thinking....

cubby123 · #1 04-07-2010, 10:31 AM

I've been thinking bout why my cub won't run recently, and I wonder if I screwed up big time. I had the engine apart during winter and got a new rod and decided to replace the piston as well. I didn't think about this before, but I never honed out the cylinder before I put in the new piston and rod and rings in.

So I'm not sure if this could be why it won't start and it's only been burping and farting. I still have lots to learn about this stuff. Don't mind my stupidity.

. Anyone got any suggestions or knowledge to share?

truckntran · #2 04-07-2010, 10:57 AM

Is there any chance you had the cam gear timing incorrect when you reassembled the engine?(did you take it apart that far? ) Are your valves adjusted to the correct clearances? are they sticking open? Were the valves lapped in or at least cleaned well with a wire brush?

And is the tank topped off with fresh gas and do you have a nice clean spark plug, not a fouled one from too much fuel?

All of the above are just shots in the dark, but worth considering anyway.

EDIT: Did you make certain the ring gaps were offset from each other ? Lining them up would also be a reason for poor compression... Also not honing can cause poor compression and will cause oil smoking..You might want to pull the engine and get the cylinder honed before the season kicks off.

cubby123 · #3 04-08-2010, 07:26 AM

When I had the head off when I first got it the valves didn't stick but I didn't check for clearance and I'm pretty sure but not positive that I cleaned the valves. I guess it's time to tear her back down again. I didn't go as far as disassembling the timing gears and such. I just took out the connecting rod and piston. Everything else was in good shape. I totally forgot about honing til my uncle talked to me about him honing something else I can't recall. Well, at this point might as well strip her down and start restoring her. I'm going to create a different thread in the restoration section for tips and stuff. My last attempt at restoring a tractor went over poorly.

But there's always a second chance, and I have a sand blaster this time.:biggrin2.gif:

johncub7172 · #4 04-08-2010, 07:57 AM

sounds like you and me are in the same boat. "Merkel" would know all this secret stuff. my k161 broke hims little arm and scraped up the piston. so later on i will get it re-built. thats the beauty of these old tractors....you can fix anything. so in the mean time, i had another motor on the shelf and in no time flat i was back in the saddle again. these are addicting....when i needs me a part, i sometimes and up with a whole nother parts tractor to boot! good luck with your project. there are a few ideas to choose from as you decide how long you want it to be down! but for starters i would be doing my home work on every thing about it and what this site and folks have shared with us.! thanks, John.

cubby123 · #5 04-08-2010, 10:21 AM

Quote:

Originally Posted by johncub7172

sounds like you and me are in the same boat. "Merkel" would know all this secret stuff. my k161 broke hims little arm and scraped up the piston. so later on i will get it re-built. thats the beauty of these old tractors....you can fix anything. so in the mean time, i had another motor on the shelf and in no time flat i was back in the saddle again. these are addicting....when i needs me a part, i sometimes and up with a whole nother parts tractor to boot! good luck with your project. there are a few ideas to choose from as you decide how long you want it to be down! but for starters i would be doing my home work on every thing about it and what this site and folks have shared with us.! thanks, John.

I wish I could plop an engine right in there. Better yet I wish I had a few running spares on the shelf lol. But I unfortunately only have that one 12hp kohler sitting in my cub. My other Kohler's a 17 twin. Imagine that in there. Off topic but yesterday while driving I saw a gray painted cub and it had a twin cylinder engine in it. Poor thing just sits there.

eastonct124 · #6 04-08-2010, 12:15 PM

It's not rocket science. So, don't get all bent out of shape trying to figure it out.
The quickest, easiest, and it just so happens....THE RIGHT way to figure it out is to pop it out....
Yeah, spend the whopping 1/2 hour to take it out, bolt it down on a wooden bench (I use lag screws), and take it apart, down to where you previously took it apart.
Lay the parts out, as you take it apart.
Then check it, and reassemble, one piece at a time, checking all your clearances.
I always check, double check, then triple before buttoning up.
While on the bench, use jumper cables and start it up.
Do your timing, and even adjust the carb.
shut it down, restart it. Get the bugs out n the bench.