14.5 B&S starter or ign.prob.

Reply

  #1  
Old 06-12-07, 06:58 PM
Member
Thread Starter
Join Date: Jun 2007
Posts: 8
14.5 B&S starter or ign.prob.

this ones stumping me.Its a 14.5 IC twinn briggs that runs excellent when it will turn over.Wont turn over except for like one revolution.like the starter hasnt a good ground, good connection,or bad brushes.i bypassed and disconected all switches and jumped the starter straight from a car battery just too see if it would spin free thinking mabe safety switch or something.still one rev.then stick and wire get hot.hit again same thing.pull one or both pluggs and spinns like mad.checked valves,move fine.took out pcv.same thing.then out of blue one time,boom fires and runs like purring kittin.turn it off and back to the !#%^&* trouble shooting.Dont have a manual or drawing of engine.so i dont know how the valve timming works excactly but imagine its all cam and cant jump.so that would eliminate compression.hoping its not the starter but seems logical even though i switched out the brushes.have you ever run in to this problem before.its my second time but i sold the last one before i found the problem.P.S.not flodded.cause i cut off fuel too just to see. thank you for the help.
 
Sponsored Links
  #2  
Old 06-12-07, 08:27 PM
duigoose's Avatar
Member
Join Date: Jul 2006
Location: USA
Posts: 306
Have you checked the oil level and for gas in the oil?
 
  #3  
Old 06-12-07, 11:27 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,575
If the oil level checks ok, and you don't smell gas in the oil, then what about the valve clearances? Have you checked/adjusted them?
 
  #4  
Old 06-13-07, 04:23 AM
Member
Join Date: Dec 2005
Posts: 190
The pro's in here can verify but it sounds like the compression release is not working...I'm not sure if a 14.5 hp has a comp release but my 17 hp has one and will barely turn over if the release is not working.
 
  #5  
Old 06-14-07, 03:30 PM
Member
Thread Starter
Join Date: Jun 2007
Posts: 8
No gas in the oil at all.Good oil and good level.When i had it running the other day it didn't smoke or miss a beat.Thats why i am stumped.because if the valve lash was off it would run rough and probably smoke.I would like to check them just for giggles but i don't have a manual,i need the clearence specs.Comp.release seams verry logical but don't know if it has one or where it would be.I've got a gut instinct it might be the starter but cant afford to buy one just to find out.Yard grass is getting so tall i could probably sell it for hay soon.I appreaciate your input.
 
  #6  
Old 06-14-07, 10:42 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,575
The valve lash would not cause it to smoke in any case, and it would have to be off a lot to make it run rough. If it's .005" out of tolerance it would be unnoticeable in the way it runs, but it could be enough to render the compression release ineffective.

Usually hard cranking on OHV engines is due to valve clearances. When was the last time you adjusted them? You know it's a reccomended periodic maintainence right?
 
  #7  
Old 06-15-07, 05:01 AM
Member
Thread Starter
Join Date: Jun 2007
Posts: 8
i have never adjusted them,and cant tell you if the last owner ever had either.I will have to go to tracter supply and take a glance in a manual to see if i can get the clearance tollerances.Sounds verey probable though.thanks for the input and will post you what i find out.
 
  #8  
Old 06-15-07, 06:45 PM
Member
Thread Starter
Join Date: Jun 2007
Posts: 8
does anyone know what the tollerance is on the valves for the 14.5 B&S Ic.I cant find any numbers imprinted in the block or any tabs with the model number on it.I have searched all over and havn't been able to find a manual for it.Im shure some of you pros out there got it imprinted in your minds like your'e home phone number by now.I know i do for some of the auto engines i've worked on.Just dont have as much time under the hood of this one yet.preciate the help.
 
  #9  
Old 06-16-07, 09:28 AM
puey61's Avatar
Member
Join Date: Apr 2004
Location: Upstate New York
Posts: 3,224
Since this is an "IC" engine, I'll assume it is an opposed twin Briggs, as opposed to a V-twin. On the opposed twins you will set the intake a .006" and the exhaust at .009" If this is not an opposed twin post back with the engine ID numbers.
 
  #10  
Old 06-16-07, 10:53 AM
Member
Thread Starter
Join Date: Jun 2007
Posts: 8
COOL! yes it is an opposed twin.thank you.
 
  #11  
Old 06-17-07, 11:47 AM
Member
Thread Starter
Join Date: Jun 2007
Posts: 8
O.k. valve clearance is perfect.so that cancels out them.I toook the starter completly apart cleaned it thouraghly and its still doing it.dont seem to be starter cause if i take out right plug(facing front of engine)and leave left in.it doesnt want to turn over.If i take out left and leave right in it spins over fine.you think maybe compression release is sticking on left side or something to that effect?
 
  #12  
Old 06-17-07, 05:02 PM
puey61's Avatar
Member
Join Date: Apr 2004
Location: Upstate New York
Posts: 3,224
Being an opposed twin Briggs, this likely does not have a MCR (mechanical compression release) which means you will want to remove the suspect cylinder head and have a look at the combustion chamber. Post back with the model, type and code numbers of the engine so we can see exactly what you have. Did you check all four valves for proper clearance? If so, what are the exact steps you took to measure them and with what tool?
 
  #13  
Old 06-18-07, 08:10 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,575
Hmmm...I assumed this was a V-twin vanguard (the most common 14.5 twin that I see). This is a flathead engine, not an OHV engine? Model#?
 
Reply


Thread Tools
Search this Thread
Display Modes
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



All times are GMT -7. The time now is 03:42 PM.