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Cub Lo-Boy 154

L

Lynn Patrick

Well-known Member
Hi! I'm new to this site but not new to engines, & also not sure if this is the correct site for this question. I have a Cub Lo-Boy 154 serial 021934 that has been running great until now. The last time I used it (5 days ago) it started immediately, like always, ran great for about 30 minutes, then would pull down for a few seconds, then come back. Now when I tried to start it the engine seems to be nearly locked up. I say nearly because I can get it to turn a few degrees. The oil is full & not very old & battery is fully charged. I know I need to tear it down to find the trouble (& hope it isn't crank bearings!) but was wondering if there is anything I should be looking for.
Any help or suggestions are appreciated!
Thanks,
Lynn
 
Its a little too soon to "tear it down to find the trouble", you need to see if you can crank it by hand, does it turn hard all around? Do you have coolant on top of the pistons? Are the hydraulics bound up? Do some investigation.
 
Charlie,
I have the plugs out.
It will only turn a very few degrees by hand, and will only turn w/the starter if I back it off those few degrees first, then only back to where I started. I tried rocking it in 3rd gear but still couldn't turn it more than the same.
 
Hmmmm, that's not good, I wonder if the hydraulic pump could be eating some metal? Other than that, the next step might be to drain the oil, and look for metal, then the oil filter, and look for metal. Did all the plugs look good? She didn't swallow a valve did she?
 
Plugs look good.
Am wondering about your question about the hydraulics. Is there some way to disengage them to check if that's where the problem is?
Thanks for the help!
 
Now I can add to the mystery. I did what Charlie suggested, drained the oil & checked there & the filter for metal. Nothing in the oil, nothing in the filter, but I used a long slim magnet thru the drain plug & pulled out a perfectly good rod cap bearing! So how did I drive it in with no extra noises???
 
Okay. I pulled the pan & found a few small pieces of metal. Can't tell where they came from. There is a small stove bolt & lock washer - like is used to hold a condenser in the distributer. A couple very small pieces broke off of something, & 2 small steel balls about the size of BBs. Is there any small ball bearing in the governor? And could governor pieces end up in the pan? And the only way that rod cap bearing got in there was it had to have been left there!
Any ideas where to look?
 
Lynn, there is a thrust bearing in the governor, those ball bearings are about that size. That bearing is lubed by engine oil, so I suppose it could end up in the pan. I don't know where the stove bolt could come from, but heck, you've found a bearing shell in there too. Might want to check the governor. But looks like you'll be doing an overhaul, not the best time of year for that.
 
Thanks again, Charlie. Looks like the old Cub 1250 will be getting a workout for a while, & also looks like I'll find out what the innerds of the governor are!
 
The balls in the thrust bearing of the governor are half the size of a BB or less. Now that you have the fan off, does the engine turn over ok? the items you are describing could have been dropped down the oil filler by a prankster. Your turning part way problem can be caused by a sticking valve, or possibly a lump of carbon in the head. Fan is a possibility also.
 
Thanks John. Some of the parts I found are definitely from a governor, but evidently a prior governor failure. I just took it off & it's all there, but I could identify 2 balls from a thrust bearing & a part of the fork as 3 of the parts I found. I have a feeling you are right about a prankster & the rod cap bearing.
Now while I gather info about rebuild parts can anyone tell me the torque specs for this engine - rod caps, mains, head, etc?
Thanks for all the help so far!
Lynn
 
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