Engine rebuilt and smoking badly.

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Megoto
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Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Tue Mar 30, 2021 7:52 pm

Well I re-did a tune up and am having the same problem. I'm thinking I may have to open the engine up again and see if if I may have missed something or did something wrong.

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Re: Engine rebuilt and smoking badly.

Postby Jim Becker » Tue Mar 30, 2021 8:17 pm

About all I can think of in basic engine assembly that might cause this is mis-timing the cam shaft. I'm not even sure that could cause it. You can check cam timing without disassembly.

Get somebody local to look it over first hand before you start tearing it all apart.

The rotor turns clockwise and cylinders are numbered from the radiator.

Megoto
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Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Wed Mar 31, 2021 4:27 pm

Ok so I got the carburetor fixed and the smoke has turned more of I guess a blueish. It smells like an old diesel engine. And she isn't running smooth. Could the tractor shop given me the wrong piston rings? That is the only thing I can think of now that the carb is working right and the smoke is no longer black and smelling like gas.

Megoto
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Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Wed Mar 31, 2021 4:31 pm

So forgive me if you think I don't sound like much of a mechanic but I am still learning about the old vintage stuff. My training is on more advanced things like attack hellicopters ;)

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Rick Spivey
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Re: Engine rebuilt and smoking badly.

Postby Rick Spivey » Thu Apr 01, 2021 7:34 am

So what was done to the block to prepare it for a rebuild? Was it bored oversize? Were the cylinders honed? By description it sounds like new rings were put in old worn bores.....
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Re: Engine rebuilt and smoking badly.

Postby SamsFarm » Thu Apr 01, 2021 8:20 am

Megoto wrote:Ok so I got the carburetor fixed and the smoke has turned more of I guess a blueish. It smells like an old diesel engine. And she isn't running smooth. Could the tractor shop given me the wrong piston rings? That is the only thing I can think of now that the carb is working right and the smoke is no longer black and smelling like gas.



Is there a chance, any chance that you (or someone else) put 2 stroke mixed gas in this?

Or maybe some diesel fuel or kerosene?

If there is a chance, drain it out and put some fresh gas in the tank. If the gas is old, drain it out and use some fresh stuff!

Just a thought!
Good luck!
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Megoto
Posts: 30
Joined: Tue Feb 28, 2017 1:53 pm
Zip Code: 38225
Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 01, 2021 8:24 am

Cylinders were honed. There was no visible damage to the walls and no corrosion. Did I miss something?

Megoto
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Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 01, 2021 8:29 am

No chance don't have any Diesel machines and there is no 2 stroke oil or mix in my shop.

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Re: Engine rebuilt and smoking badly.

Postby tst » Thu Apr 01, 2021 8:55 am

Did you measure the bore to see how worn it was ?

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Re: Engine rebuilt and smoking badly.

Postby SamsFarm » Thu Apr 01, 2021 9:12 am

tst wrote:Did you measure the bore to see how worn it was ?


:Dito:

Measure the bores in multiple spots of each bore?

And if you reused the pistons they whould need to have been measured (multiple places) to see if they are within IH specs, especially the skirt area!
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Megoto
Posts: 30
Joined: Tue Feb 28, 2017 1:53 pm
Zip Code: 38225
Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 01, 2021 12:31 pm

I measured where I could on the bore and I didn't measure the pistons so I guess I will be pulling them back out. Learning curve sucks. I will be getting a better manual as well. How do you measure inside the bore? I've never had to measure anything like that. I have a set of calipers and a machinists ruler but I am not able to get accurate measurements of anything deeper than the calipers can reach.

SamsFarm
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L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
Home Made Fast Hitch Potato Plow
54A Blade

Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
Cub-189 Two Way Plow
Cub-22 Sickle Bar Mower
Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)

Misc Belly Mowers

Wish List
International 100 Fast Hitch Blade
Mott Fast Hitch Flail Mower

Wish Wish Wish List
Fast Hitch Rotary Hoe
4E hammer mill
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Re: Engine rebuilt and smoking badly.

Postby SamsFarm » Thu Apr 01, 2021 2:26 pm

Megoto wrote: How do you measure inside the bore? I've never had to measure anything like that.


The best tool is a dial bore gauge, but they are expensive and very limited use! Chances are only a engine shop will have one!

The ideal "home" shop use is a quality telescoping gauge and micrometer from a company like Starrett!

A inside micrometer works too, but they can be cumbersome in a small bore!

Problem is even the finest of measuring tools takes some practice and "feel" to get precision measurments with!


Megoto wrote:I have a set of calipers and a machinists ruler but I am not able to get accurate measurements of anything deeper than the calipers can reach.


Calipers are not for precise precision work! Even with a quality set a person can squeeze it enough for a +/- .004, or have it cocked, off center, not square, etc!

Lol! Fyi..... Machinists dont use rulers, Kids in school do..... Machinists use steel scales! :)

Do you know a machinist, tool & die maker or mold maker? They would be your first "go to" for help on this matter!
1968 Cub fast hitch

Megoto
Posts: 30
Joined: Tue Feb 28, 2017 1:53 pm
Zip Code: 38225
Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 01, 2021 2:54 pm

No I don't. So if I can do it myself I would much prefer that. I can make pretty much anything as long as I have a design and I can get the telescoping guage and calliper. So any advice is greatly appreciated. Just need to keep the brain busy ;)

SamsFarm
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Posts: 673
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
Home Made Fast Hitch Potato Plow
54A Blade

Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
Cub-189 Two Way Plow
Cub-22 Sickle Bar Mower
Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)

Misc Belly Mowers

Wish List
International 100 Fast Hitch Blade
Mott Fast Hitch Flail Mower

Wish Wish Wish List
Fast Hitch Rotary Hoe
4E hammer mill
Location: Ne Ohio

Re: Engine rebuilt and smoking badly.

Postby SamsFarm » Thu Apr 01, 2021 5:01 pm

Megoto wrote: So if I can do it myself I would much prefer that. I can make pretty much anything as long as I have a design and I can get the telescoping guage and calliper. So any advice is greatly appreciated.


Once you have the measuring tools, copy or print out the proper specifications page (that is where the minimum and maximum specs will be) from a IH Cub service manual, whether you have a hard copy at home or need to print one off from the pdf manuals section here at farmallcub.com!

On the printed or copied page you can write all your dimensions from each measurement!



*You might do a zip code search and see if there is a member close by your area that could help you out!*

Goid luck, I hope you get it figured out soon! :)
1968 Cub fast hitch

Megoto
Posts: 30
Joined: Tue Feb 28, 2017 1:53 pm
Zip Code: 38225
Tractors Owned: 154 LO Boy and a Yazoo 34 PTO-W

Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 01, 2021 5:25 pm

Me too, thanks for the help and I'll keep y'all posted.


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