Briggs OHV Single Missing, Out of time? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
Small Engines and Repair

Midwest Mower Pro

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 Old 08-13-2019, 04:28 PM Thread Starter
Senior MTF Member
 
mrshaft696's Avatar
 
Join Date: Mar 2017
Posts: 167
Briggs OHV Single Missing, Out of time?

Check this out..... Engine is getting fuel, valves are not seized or busted. I looked and the flywheel key appeared to be in place, is it possible the coil is malfunctioning? This is a single cyl 12hp powerbuilt briggs.


Attached Thumbnails
Click image for larger version

Name:	IMG_3474.jpg
Views:	10
Size:	93.5 KB
ID:	2390835  
mrshaft696 is offline  
Sponsored Links
Advertisement
 
post #2 of 23 Old 08-13-2019, 08:04 PM
Senior MTF Member
 
Join Date: May 2015
Location: Oklahoma
Posts: 779
Re: Briggs OHV Single Missing, Out of time?

Have you checked the valve lash. (per the service manual) Set when 1/4 past TDC, etc.

I seen a puff of smoke up front. What is the compression? them are know for leaking head gaskets.


What does it do if you try to rev the engine?

Do not run it very long with the air cowling off. (it will overheat)
Forest Gump is offline  
post #3 of 23 Old 08-13-2019, 09:02 PM Thread Starter
Senior MTF Member
 
mrshaft696's Avatar
 
Join Date: Mar 2017
Posts: 167
Re: Briggs OHV Single Missing, Out of time?

Quote:
Originally Posted by Forest Gump View Post
Have you checked the valve lash. (per the service manual) Set when 1/4 past TDC, etc.

I seen a puff of smoke up front. What is the compression? them are know for leaking head gaskets.


What does it do if you try to rev the engine?

Do not run it very long with the air cowling off. (it will overheat)
yes yes i know the cover I ran it for 20 sec etc.....

I was running fine and then it died.... So I finally got it to start and this is what it does. I have replaced many OHV single head gaskets so I could check that out....

I can check the valve lash yes, but looking at it by eye it wasnt really loose or tight which is concerning to me....
mrshaft696 is offline  
Sponsored Links
Advertisement
 
post #4 of 23 Old 08-14-2019, 11:01 AM
Senior MTF Member
 
JimC_Vt's Avatar
 
Join Date: Apr 2009
Location: North West Vermont
Posts: 277
Re: Briggs OHV Single Missing, Out of time?

set valve lash first, run the engine , is it better or worse ??? If worse pull the head, the sparkplug can't burn the fuel and oil mix, BTW did you try a new sparkplug ??? Is the float bowl clean ??? The coil could be failing , but what is the airgap set at ???

My 2 cents, Jim
JimC_Vt is offline  
post #5 of 23 Old 08-14-2019, 02:49 PM Thread Starter
Senior MTF Member
 
mrshaft696's Avatar
 
Join Date: Mar 2017
Posts: 167
Re: Briggs OHV Single Missing, Out of time?

Quote:
Originally Posted by JimC_Vt View Post
set valve lash first, run the engine , is it better or worse ??? If worse pull the head, the sparkplug can't burn the fuel and oil mix, BTW did you try a new sparkplug ??? Is the float bowl clean ??? The coil could be failing , but what is the airgap set at ???

My 2 cents, Jim
Thanks for the reply, yeah first thing I did was change the plug & try multiple other plugs. I checked the gap on the coil quickly but I need to verify with feeler gauge.

I didnt open the carb yet because its a nikki & they have those idiotic gaskets that dont like to be taken apart more than 1 time.

I will try setting the valves.

I also noticed at some point i did replace that coil with an amazon china coil, that is kind of why I suspect it.
mrshaft696 is offline  
post #6 of 23 Old 08-14-2019, 04:46 PM
3K Poster!!!!
 
Join Date: May 2009
Location: ontario
Posts: 3,691
Re: Briggs OHV Single Missing, Out of time?

Sounds to me like metal against metal rather than a misfire. Maybe you have coil touching flywheel or as mentioned a rocker hitting a push rod.
38racing is offline  
post #7 of 23 Old 08-15-2019, 08:13 AM Thread Starter
Senior MTF Member
 
mrshaft696's Avatar
 
Join Date: Mar 2017
Posts: 167
Re: Briggs OHV Single Missing, Out of time?

Quote:
Originally Posted by 38racing View Post
Sounds to me like metal against metal rather than a misfire. Maybe you have coil touching flywheel or as mentioned a rocker hitting a push rod.
the noise is the popping out of the exhaust because of how poorly it is firing.
mrshaft696 is offline  
post #8 of 23 Old 08-15-2019, 09:51 AM
Senior MTF Member
 
Join Date: May 2015
Location: Oklahoma
Posts: 779
Re: Briggs OHV Single Missing, Out of time?

Watch the video close toward the valve cover and you can see intermittent smoke puffs. Look like maybe oil smoke, but ????

Wonder if the smoke is a hint. The engine w/o the air cowling is running cool so this smoke is not being produced due to a oil leak onto a hot engine.

He indicates it done it all at once, no warning when it quit.
Forest Gump is offline  
post #9 of 23 Old 08-15-2019, 01:22 PM
15,000 +posts!
 
Tractor-Holic's Avatar
 
Join Date: Jan 2008
Location: MA
Posts: 19,296
Re: Briggs OHV Single Missing, Out of time?

Sounds like the choke is closed !...too rich a mixture...


Tractor-Holic is offline  
post #10 of 23 Old 08-15-2019, 02:53 PM
Senior MTF Member
 
Join Date: May 2015
Location: Oklahoma
Posts: 779
Re: Briggs OHV Single Missing, Out of time?

Quote:
Originally Posted by Tractor-Holic View Post
Sounds like the choke is closed !...too rich a mixture...
Agree.

He needs to look under the air filter cover with the engine not running and see if the spring loaded choke rod it returning when the throttle lever is moved from fast to slow. that is type carb that gets choke applied when the throttle lever is a max throttle. (and also make sure the choke is not applied when the engine is running)

Don't know why it would happen all at once unless a choke return spring broke.
Forest Gump is offline  
post #11 of 23 Old 08-15-2019, 08:34 PM Thread Starter
Senior MTF Member
 
mrshaft696's Avatar
 
Join Date: Mar 2017
Posts: 167
Re: Briggs OHV Single Missing, Out of time?

OK I didnt have much time tonight, but I swapped the coil to another known good coil and it runs the same.. I checked the choke and it is working properly, no difference if it is on or off.....

Guess I am checking the valves or pulling the head tomorrow cant think of anything else.
mrshaft696 is offline  
post #12 of 23 Old 08-16-2019, 07:03 AM
Senior MTF Member
 
Join Date: May 2015
Location: Oklahoma
Posts: 779
Re: Briggs OHV Single Missing, Out of time?

Quote:
Originally Posted by mrshaft696 View Post
OK I didnt have much time tonight, but I swapped the coil to another known good coil and it runs the same.. I checked the choke and it is working properly, no difference if it is on or off.....

Guess I am checking the valves or pulling the head tomorrow cant think of anything else.

no difference is the choke is full on???? suspect
Forest Gump is offline  
post #13 of 23 Old 08-18-2019, 06:38 PM Thread Starter
Senior MTF Member
 
mrshaft696's Avatar
 
Join Date: Mar 2017
Posts: 167
Re: Briggs OHV Single Missing, Out of time?

So took everything apart and it seems head gasket is ok, I cleaned up the piston, flywheel looks ok. The only thing I noticed is the little brass part in the bottom of the carb was dislodged. So It was kind of loose, so I put a little rtv around the edges and hopefully it will stay put... I couldnt restart the engine because I need to wait for the new head gasket.....
Attached Thumbnails
Click image for larger version

Name:	IMG_3549.JPG
Views:	6
Size:	1.58 MB
ID:	2391915   Click image for larger version

Name:	IMG_3550.JPG
Views:	7
Size:	1.58 MB
ID:	2391917   Click image for larger version

Name:	IMG_3551.JPG
Views:	10
Size:	1.54 MB
ID:	2391919  
mrshaft696 is offline  
post #14 of 23 Old 08-18-2019, 09:53 PM
3K Poster!!!!
 
Join Date: May 2009
Location: ontario
Posts: 3,691
Re: Briggs OHV Single Missing, Out of time?

Nikki carb right? Is the jet installed from the right direction. There's a thread on some forum about that .
38racing is offline  
post #15 of 23 Old 08-18-2019, 10:44 PM
3K Poster!!!!
 
Join Date: Jun 2013
Location: Ohio
Posts: 3,291
Re: Briggs OHV Single Missing, Out of time?

Quote:
Originally Posted by mrshaft696 View Post
So took everything apart and it seems head gasket is ok, I cleaned up the piston, flywheel looks ok. The only thing I noticed is the little brass part in the bottom of the carb was dislodged. So It was kind of loose, so I put a little rtv around the edges and hopefully it will stay put... I couldnt restart the engine because I need to wait for the new head gasket.....
The jet was the problem. It was running rich and chugging.
The jet will work installed either way but the correct way to install is from the top. That way it can not fall out ans sit in the bottom of the bowl like it was doing.
You have to use a drill bit or something to slide it in to make sure it is not sideways and push it into the hole so o-ring seals it.

I find them all the time in from the bottom and I believe some even came from factory this way.
TobyU 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



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