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Onan Engine problem again

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#1 robintwist OFFLINE  


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Posted March 10, 2011 - 12:08 PM

Hi, I am trying to set the points on an Onan B48M-GA018 twin cylinder engine on my Snapper 1855 but each time the engine is run the points gap has changed, even though they are tight.
Can anybody help?

#2 Big John OFFLINE  

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Posted March 10, 2011 - 12:20 PM

If screws holding points thread into aluminum check for stripped threads. If engine has
a small rod to operate points check for crud on the rod. Are you checking gap again
after final torqueing of the screws. Sometimes they will change. Sometimes I have had
to redo them 3 or 4 times before they will stay where they belong.

#3 tractorgarden OFFLINE  


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Posted March 10, 2011 - 12:25 PM

Try and clean the adjustment screw with brake cleaner or carb cleaner ,and put a dab of non permanent lock tight on the threads. They make many differant grades of thread locker. hope this helps , Shawn

#4 adamscr OFFLINE  



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Posted March 10, 2011 - 03:20 PM

If the threads are the problem, this is what someone had done to my engine. They had taken a screw and run it through the hole from the rear and then used a nut on the points side to tighten them down. At first I thought it was pretty tacky but it works fine and takes the stress off the aluminum points cover. At first I was going to tap the hole out to 8-32 but an 8-32 screw won't go through the points.