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K301 rod

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Ron symington

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Joined
Dec 6, 2020
Messages
12
Location
Ontario Canada
k301 rod let go….why
piston.003 and .300 ring end gap…..smokes alot
 

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mgonitzke

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Joined
Aug 4, 2006
Messages
4,329
Location
Wichita, KS
displayname
Matt Gonitzke
Probably lack of oil, or simply fatigue failure- too many hours, or there might have been a flaw in the rod casting.

Those two smaller pieces look like the governor flyweights. The nylon governor gear probably got destroyed by all the shrapnel flying around in there after the rod let go.
 

abthomas

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IHCC Supporter
Joined
Nov 10, 2019
Messages
64
Location
new florence pa
How so? Looks like every broken rod I have ever seen...

Only thing we can really tell for sure is the rod cap bolts were not loose.
most I've worked on have been seized to the crank, busted bolt and twisted cap and along with that i've also seen them snapped off under the wrist pin, but my "guess" is this one over revved due to what looks like gov weights in pic and likely was worn enough to fly apart ?
 

Mark Evans

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Joined
Jul 26, 2021
Messages
241
Location
Perryton, Tx 79070
k301 rod let go….why
piston.003 and .300 ring end gap…..smokes alot
You should note the oil loss was not it and it was over stress on the rod do to the revs too high, the piston end of rod should be shown also along with the bearings, piston was not low on oil either !!!!! Could tell you more from a close up of the upper rod part had failure analysis I and II, from CAT in 2002, you would not believe what can be deducted from a set of jewelers loops 10x too 30x and proper inspection !!!!🔎 Still have both two inch books on the class’s !!!
 

dkirk

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Joined
Oct 20, 2003
Messages
499
Location
Fond du Lac, WI
displayname
David Kirk
I've worked on a lot of small engines and have never seen a rod failure quite like this one. The way the crankpin end of the rod failed is telltale - looks as if it may have initiated at a rod screw thread, then crack progressed inward towards the bearing surface. Once strength was lost, the other side failed quickly in the same area. As the engine coasted down, the remainder of the rod shank was beat by the rotating remains on the crank. Keep in mind I'm making this diagnosis just by looking at the two pictures so I may be totally wrong.
 

dsarow

Well-known member
Joined
Jul 13, 2014
Messages
76
Location
Near Madison Wi.
displayname
Dean W.Sarow
How about a little more info on the unit,hours,has it been rebuilt,new Kohler parts or other brands.I had my K-301 overhauled,my tech recommended that rod I had in mine that came from China for cheap should be tossed,I did,I can see what could happen,I wonder if this is possible
 

Mark Evans

Well-known member
Joined
Jul 26, 2021
Messages
241
Location
Perryton, Tx 79070
The KT17 without an oil pressure and no oil filter are ran on a tilt the high side will run out of oil and gouge up and break a rod, all the time !!!! The good one is the series II 18 magnum with live oil system and filter setup !!!!
 

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