Tech Support Forum - View Single Post

ricobandito · 05-24-2009, 12:50 PM

I have a troy-bilt walk behind mower with a 9HP engine. model 28B702 type 1143-E1

I am looking for some information on replacing a broken piston rod.

A little history...

At one point, it was leaking fuel into the oil, I eventually tracked it down to some crud blocking the needle in the carb. Drained and replaced the oil and fuel. Ran it for about two hours during which is ran great and then as I was mere seconds from finishing, it made a large clank and an abrupt stop.
Eventually, got brave enough to tear the engine down and discovered that the piston rod had shattered. May have gotten overheated from some remaining fuel contamination, I don't know, but I digress. Other than the piston rod, everything looked fine. I ordered a new piston rod, gaskets, and oil flinger. However, as I reassemble it, when I tighten down the piston too the crankshaft, I cannot get it to turn any more. I don't see an remnants of any type of bearing and did not see one in the exploded view. Connections on the old rod pieces so not show any spacers or shims. It would seem like I shouldn't leave any play in this connection, but it is the only way I can get the shaft and flywheel to turn.

What am I missing, do I need to grease the crankshaft? If so, with what?
Or is there some type of adjustment or shim I should be using? Once I get past this, I think I can make a full repair or an stunning conversation piece.

05-24-2009, 12:50 PM	#1 (permalink)
ricobandito Registered User Join Date: May 2009 Posts: 1 OS: xp	Replacing piston rod on B&S Engine I have a troy-bilt walk behind mower with a 9HP engine. model 28B702 type 1143-E1 I am looking for some information on replacing a broken piston rod. A little history... At one point, it was leaking fuel into the oil, I eventually tracked it down to some crud blocking the needle in the carb. Drained and replaced the oil and fuel. Ran it for about two hours during which is ran great and then as I was mere seconds from finishing, it made a large clank and an abrupt stop. Eventually, got brave enough to tear the engine down and discovered that the piston rod had shattered. May have gotten overheated from some remaining fuel contamination, I don't know, but I digress. Other than the piston rod, everything looked fine. I ordered a new piston rod, gaskets, and oil flinger. However, as I reassemble it, when I tighten down the piston too the crankshaft, I cannot get it to turn any more. I don't see an remnants of any type of bearing and did not see one in the exploded view. Connections on the old rod pieces so not show any spacers or shims. It would seem like I shouldn't leave any play in this connection, but it is the only way I can get the shaft and flywheel to turn. What am I missing, do I need to grease the crankshaft? If so, with what? Or is there some type of adjustment or shim I should be using? Once I get past this, I think I can make a full repair or an stunning conversation piece.