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briggs 24 h.p.

A

Anonymous-0

Well-known Member
Hi,

I have a Craftsman mower with the 24 h.p. twin cylinder overhead valve engine. It developed a popping sound at the exhaust. When the valve covers were pulled to chech the value adjustment one of the push rods was missing. What happened? Where did the push rod go? What kind of problems am I loking at? Solutions?

Thanks in advance for any ideas, advice, and information you care to share about this problem.

Thomas
 
Usually, the pushrod will be sitting there next to the rocker arm. Unusual for it to vanish. I want to look up pic so I can try and tell where it went. If it isn't there and there is not a hole in the valve cover, then it is inside the engine. If the cam broke, then the lifter might drop into the engine and let the pushrod drop there too. Or, the pushrod went thru a oil drain hole. If you just picked this mower up, then someone possibly removed the pushrod.
 
If missing push rod for exh valve,this mod eng use's an aluminum push rod for exh valve,there have been reports of push rod bending/breaking on some of these eng,IF the pushrod did break at the very least you'll have to pull head to remove as broken rod probably sitting on valve tappet,depending on length of rod after removing head you may be able to grab broken rod with fingers/pliers,depending on length of broken top end of rod it probably fell into crankcase,if you can't find it in head assembly you'll have to decide if you want to seperate oil sump from block & locate/remove broken pc or take a chance replaceing rod & running as is.Several guys that have had this problem said they replaced rod with a steel rod as used on intake valve,what if any affect this has on valve clearance or life of same after eng gets hot I don't know.
 
What happened was the valve froze open in the head, It may not be frozen now, but it was at one time- the pushrod fell from between the tappet and the rocker arm and it worked its way down the oil return hole into the crankcase.

Usually its an intake valve that does this and the culprit is old gasoline causing deposits on the intake valve stem.
 
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