[DrBailey]

I have a 1982 CASE 448, I cant seem to get the carb to adjust out right, I did install a new kit and fuel pump kit.
It will run great for some time and then go into a surging mode.
I did a valve job on the Onan B48M with new gaskets.
Is there a chance that I have a vacume leak at the manifold? I also did install new base gaskets there.
Its a split ( two piece intake,factory riveted together top and bottom.)
Im about to purchase a new carb(if I can find one) but if the intake might be a problem then I wasted some money.

Any thoughts or suggestions? any tips on where to purchase a carb and intake?

 

[Mark / Ohio]

Any chance your pulling a vacuum in the fuel tank?

Or the fuel line placed too close to a hot spot, vapor lock?

 

[Brad]

Some folks use carb cleaner and have heard of others using a propane torch (unlit) testing around suspect areas with the engine running. If there is a change in engine tone as you test the areas, you may have stumbled onto the leak.

 

[DrBailey]

Some folks use carb cleaner and have heard of others using a propane torch (unlit) testing around suspect areas with the engine running. If there is a change in engine tone as you test the areas, you may have stumbled onto the leak.

No vac, @ the tank, I will try the spray for leak now , thanks guys.

 

[DrBailey]

Any chance your pulling a vacuum in the fuel tank?

Or the fuel line placed too close to a hot spot, vapor lock?

I dont think its vapor locking, reason being, the hotter it get the better it runs, like something is exspanding and stopping a vac leak ????

 

[DrBailey]

Well, checked today for vac. leaks with WD40, no leaks.
I did some reading on the net. one site directed me to MTF, I read a very interresting thread that I had never seen on there before. The OP of the thread had the same problem as I have. Im just as embarrased as he stated that he was. We both had the needle adjusters in the wrong sides. the idle screw and the main jet screw!!:sidelaugh live and learn.
Had a little trial run

 

[Mark / Ohio]

I'd be a good one to make that mistake too as I would have never guessed it would even be possible to reverse them. :bag:

 

[DrBailey]

I'd be a good one to make that mistake too as I would have never guessed it would even be possible to reverse them. :bag:

It could have been that way when I got it??:bag: either way, I had to fess up just in case someone else might run into this problem.
:sidelaugh I kept it running like that last year working my garden and my Daughters garden. lucky I guess.

 

[Five Points]

Glad you got that one solved Doc and thanks for sharing that tip as like you said, it may help the next guy :2th:

 

[Brad]

Great! Glad you found it. Something that you'll never forget!

 

[DrBailey]

Great! Glad you found it. Something that you'll never forget!

Thanks to everyone for the help, I told my wife that I just had to make it run right. the old CASE is so far ahead of its time with the hydraulics and and comfort of driving. it rates right up there with my JD 2210.(with its similarities)

Now Im wondering if I can take one of the JD front dozer blades and mount it to the CASE and attach the hydraulics to it?? Hummmm!

 

[DrBailey]

No one can say that Im not a patient man! :ROFL
I have used the CASE for garden tilling even thought it won't run all the time. If the engine runs good for 20 feet or so then it loses it prime, If I choke it soon enough it will pick up again. In other words I haven't fixed a thing.
I can't find a vender anywhere that can sell a reman or a new carb
everything on this Case works great, I gotta find a carb. Any new ideas in the past year??:dunno:

 

[motorhead12]

How about these people? They don't list the part on their website, but you could try contacting them to see if they could find you a carb. Might be worth a shot!

Onan Parts.Com, Rebuild Parts for Onan engines

 

[DrBailey]

I will give them a call tomorrow. thanks motorhead12

 

[Five Points]

Hey Doc, if you have no luck there, try these guys. mcdonaldcarb.com They helped me with some replacement parts for my Jacobsen.
http://www.mylawnmowerforum.com/forum/17-jacobsen/12897-jacobsen-1951-park-30-a-3.html#post131393

Nice to hear from you BTW

 

[Cased73]

I hate to say it but I needed a carb for my colt and said screw it and tried a 16 dollar eBay carb.... Was a bit rich but it worked and fires right up and runs great every day.... Everyday