78' 446 stalls under load - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
LinkBack Thread Tools Display Modes
post #1 of 2 Old 02-27-2019, 07:41 PM Thread Starter
MTF Junior Poster
 
Jwgray44's Avatar
 
Join Date: Feb 2019
Posts: 2
78' 446 stalls under load

I just bought a 78 446 with the original 16 hp onan. It was running a little rough when I picked it up so I drained the fuel tank, installed new fuel line, filter, plugs, carb/ fuel pump kit. It idles great with no choke, but to maintain a higher RPM I have to choke it about half way. Then I have to slowly engage the snow blower or it will stall out. With the air cleaner cover off, when I engage the blower at idle and then raise the RPMs, the carb will dump fuel into the engine, then it stalls out. Any help would be greatly appreciated. Thanks.
Jwgray44 is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 02-28-2019, 09:30 AM
Hemlock Case Guy
 
Join Date: Mar 2013
Location: Michigan
Posts: 262
Re: 78' 446 stalls under load

It idles great with no choke, but to maintain a higher RPM I have to choke it about half way.

If we only focus on this, it is still a fuel mixture issue. The carb kit is not the only step to get a carb right again. It takes meticulous cleaning. Just spraying the surfaces of the carb will not get even close to what is needed. You also need to remove the carb from the engine with the manifold, then separate the two.

With the manifold off and the carb off seal off the surface between the carb and the manifold. I use duct tape folded onto itself. This is so that you can fill the manifold with water to check for leaks in the manifold. It will stand on the carb top. Zero leakage overnight is the goal.

Next, you need to see or learn each passage of the carb. A straw and can or two of carb cleaner is needed. With face protection, spray into each hole. Then if it comes out of a passage make sure it comes out cleanly. Sometimes I like to revisit each passage as I think that the first time loosens the build-up, the second frees it. You will use at least the whole can if you do it right. Every piece that can be removed has to be removed to be cleaned.
ssmewing is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
1978 case 446 Jwgray44 Introductions 1 02-27-2019 07:29 PM
Front wheels wander under a load Twins Hydraulics 2 07-04-2018 06:57 PM
2003 GX345 Misses Under Load GX345ISMYTRACTOR John Deere Forum 5 05-08-2018 10:07 AM
Case 446 blowing black smoke Smithbj88 Case_Ingersoll_Colt Forum 7 02-13-2018 06:37 PM
K301 acts under load tractortinker Small Engines and Repair 11 01-19-2018 07:24 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome