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Mark J.
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Discussion Starter · #1 ·
My son Parker and I have finally started on his Cub 123 that we bought back in March (Here's the link http://gardentractortalk.com/forums/topic/60540-columbia-river-gorge-trip-for-a-cub-bolen-and-plow/). The first thing we did was install the starter/generator.

Wood Glove Gas Mechanic Engineering
Gas Engineering Machine Glove Blue-collar worker


Next was the carb.. He took it off but I took it apart and showed him it worked. I was surprised how clean it was on the inside. I sprayed it down with carb cleaner, blew it out with compressed air, and reassembled it. It's good to go!

Motor vehicle Automotive tire Gas Rim Machine
Automotive tire Automotive lighting Motor vehicle Vehicle brake Automotive exterior
Automotive tire Yellow Font Gas Wood
Artisan Engineering Gas Mechanic Plumbing valve
Safety glove Gas Engineering Machine Glove
Wood Automotive tire Automotive wheel system Circle Rim
Motor vehicle Gas Rim Auto part Machine
Hand tool Bicycle part Gas Metalworking hand tool Auto part
Wood Pliers Kitchen utensil Gas Hand tool


Third was the voltage regulator. The old one did not have a cover so I'm replacing it with one from a Cub 122 parts tractor. I got some questions about these regulators before I can reinstall the new used one. I will probably start a new thread for that once I do some research.

Old

Vehicle Motor vehicle Electrical wiring Gas Automotive exterior
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Bumper Fixture Gas Motor vehicle Automotive exterior
Automotive tire Bumper Wood Automotive exterior Gas


New used

Wood Table Bumper Gas Automotive exterior
Door Automotive tire Wood Grey Bumper


The only other thing that needs to be done is order a new ignition switch (old one was missing) and pick-up a new battery. More to come once we get the parts. Hopefully everything works as it should. If all goes well I will install one of the mowing decks that I have laying around and let him start mowing our 2 acres of grass.
 

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If the regulator is the points type, make sure the relays (mechanicals) are free, and clean, and make sure the points are clean.

These are easily adjusted, plenty of GREAT info in the manuals section of the site.

Last, but not least, looks like the best young helper I have seen in years...teach that youngster everything you know. That young man will be a millionaire, all young folks wanna do is play VID Games, not learn mechanic work, plus it's good qualty time!!!!!!!!!!!

Thank you for sharing;)
 

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Mark J.
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2,251 Posts
Discussion Starter · #6 ·
The quote feature isn't working right now nor is the cut and paste so I'll have to do this the old fashion way.

Stiemmy- Thanks for the information. I looked up the service manual for the 123 and their is lots of information about how these regulators work.

My sons is a good helper even if his attention span is sometimes short but that's to be expected for a 11 year old. :D
 
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Mark J.
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Discussion Starter · #7 ·
Kenny- It's good to be working on it! Sports, funerals, vacation, other work have kept us from working on it. Schools out so now is our time to get it done so we can take it to a tractor show in August.
 
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Mark J.
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Discussion Starter · #8 ·
Alc- It can be a lot of fun creating memories!
 

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That's how I learned a patient father . Good luck to you and your son with
this project.
It's good to see him interested. So many younger kids have no interest
in anything if it's not a computer or television
Pop and I both had street rods together and now both do the LGT hobby together and I'm in my
fifties. It's a lasting bond .
Very nice!!!!
 

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Mark J.
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Discussion Starter · #11 ·
Looking good there Mark! Quality time with the youth and educating! Big thumbs up!!!
Thanks Kevin! I'm trying to let him do as much as the work as possible. We just got a new carb in the mail tonight and my son was upset because we won't have time to work on it until Wednesday. We also have to check over the electrical because we couldn't get the starting motor to even turn. I have the schematics it's just a matter of finding the time. He wants his tractor running so bad that he can't hardly wait. I'm anxious as well but he has me beat hands down!
 
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Mark J.
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Discussion Starter · #12 ·
That's how I learned a patient father . Good luck to you and your son with
this project.
It's good to see him interested. So many younger kids have no interest
in anything if it's not a computer or television
Pop and I both had street rods together and now both do the LGT hobby together and I'm in my
fifties. It's a lasting bond .
Very nice!!!!
Working on tractors is our most favorite time together (besides him being by my side when I was coaching high school football)!

Makes me want to smile and cry at the same time!!!
 
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Mark J.
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I decided to buy a new carb for this tractor. The old one had a very badly worn throttle shaft and decide it would be ok if I just bought a new one. I'll keep the old one for now for parts.

It cost $60 and came with two styles of choke levers. The carb looks and feels like a good quality replacement. It even felt like it weighed more in my hands verse the original.

Here is what it looked like right out of the box.

Gas Machine Cylinder Nickel Metal
Gas Machine Debrecener Auto part Metal
Finger Bicycle part Gas Machine Engineering
Wheel Tire Automotive tire Rectangle Font


The choke shaft in my hands was the one installed on the carb but I switched it out with the other one it came with. Took only a couple of minutes to complete. The only thing I had to watch out for was the detente spring and ball when I removed the choke shaft.

Here is a side by side comparison of the carbs.

Gas Machine Auto part Wood Metal
Gas Engineering Machine tool Auto part Machine
Wood Gas Machine Auto part Metal


The only problem I've had so far is the hose barb on the new carb is different from the compression fitting on the old carb. I tried to switch the two but the new carb seems to have different threads. Maybe metric??? Not really much of a problems all I have to do is replace the compression fitting on the tank with hose barb fitting. We ran out of time tonight so hopefully we'll install the carb tomorrow and track down the wiring issues that is keeping the engine from cranking over.
 

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Mark J.
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Discussion Starter · #15 ·
Good to know about the metal lines. I've never had a tractor with it on it before.

Ordered a barb fitting last night for $5. It will get her Friday. Couldn't find one locally.
 

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Mark J.
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Discussion Starter · #16 ·
The barbed fitting came in last night so my son and I went out to the shop and went to work. We finished installing the carb and new barb fitting and hose. It all fit nicely together.

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After the carb we started to clean up some of the wiring connection to see if we could get the engine to turn over. I energized the start directly with a battery charger and removed the belt. It turned over smoothly without any bearing noise so that checked out ok. I bypassed the amp meter because the needle is missing so it's toast. I cleaned up the connection on the starter relay. I turned the key and the starter hummed (at least the electrical problem is fixed) but didn't turn the motor. I decided to try and turn the motor by hand but I couldn't move it. I got out my big channel locks and finally broke the engine loose. I think the rings had rusted a little bit to the cylinder wall which is why the started only hummed and didn't turn the motor. I turned the key again and the engine finally turned over but the dipstick pushed up and I had air pushing out of the muffler. I didn't notice much sucking from the carb. I think the exhaust valve is stuck open making the engine spin very freely.

Motor vehicle Gas Ingredient Cake Baked goods
Automotive tire Wood Motor vehicle Gas Rim


Did you see the gremlin on the side of the motor? :wave:

It started to get hot in the shop at 96 degrees and my son is getting over an ear infection so we called it a day for now.
 

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Mark J.
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Discussion Starter · #17 ·
Had a little bit more time tonight once it cooled down so I removed the gas tank, cooling tin from the head, and head bolts to reveal an exhaust valve that was stuck in the open position.

Automotive tire Motor vehicle Wood Gas Rim
Automotive tire Wood Gas Bumper Auto part
Bicycle part Crankset Tool Rim Vehicle brake


Sprayed some PB done the valve stem and worked it back and forth until it moved freely. I took a wire brush and a scraper and removed the built up carbon. I noticed 0.020 stamped into the top of the piston so I assume that this engine has been rebuilt at least once.

Automotive tire Rim Gas Automotive wheel system Auto part


I checked the head and block for any signs of leaking but didn't notice anything. We still need to clean and flatten the head and install a new head gasket before putting it all back together. Should have it running sometime next week.
 

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Mark J.
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Discussion Starter · #18 ·
My son and I did some more work while we waited for some parts to show up. We started by removing the exhaust valve. I had checked last night to see if the valve was seating against the seat by spraying carb cleaner and it leaked. Here it what it looked like once we removed it.

Fastener Screw Gas Automotive tire Nickel
Wood Human leg Air gun Metal Wrist
Automotive tire Wheel Motor vehicle Rim Wood


You can see the rust stalactite growing out of side of the exhaust port.

We cleaned up the valve margin and stem and lapped the valve against the seat. after 10 min. we checked again with carb cleaner and this time no leak. Reinstalled the spring retainers (which fought me for about 30 min.. Finally got that together and we started working on the head.. We took a piece of glass with wet sand paper and added water. I showed my son how to move the head so he didn't rip the paper. He was excited to do this for about 5 min. and then I took over. after 20 min. we finally got the head flat. We should be ready to start it on Tuesday when the parts arrive.

Shoe Shorts Green Water Grass
Shorts Green T-shirt Grass Groundcover
Wood Tool Auto part Font Metal
Wood Helmet Auto part Metal Tool
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