Kohler 7000 Series Endplay in Crankshaft

Doublewide6

LawnSite Senior Member
Kohler ps-kt745-3011 Vertical 26hp engine
Engine was leaking oil at bottom crank seal. I noticed a bit of side to side wobble on the lower end of the crank. With engine running the shaft appears to be true (not bent). I thought the engine would need new crank bearings, but the parts diagram does not show any bearings in this engine. With pto removed from crank and all belts removed from the engine it vibrates too much for me. I didn't take the engine off the mower yet, but I wanted to post here to get some info. Since there are not crank bearings can I just replace the bottom sump? With the crank being steel it think the wear would be on the aluminum sump? I would think the top of the crank would be okay because there is more pressure on the bottom with all the belts and pto. I am going to have to take apart and inspect, but was wondering what parts to really focus in on, or if you have ever seen this happen with these engines. thanks
 

BigFish

LawnSite Fanatic
Location
chesapeake, va
For some reason, most sumps don't have a bearing. A lotta cases have a bearing on the flywheel end only.
Pull it apart afore ya order a sump. crank may be scored, right ?
 
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Doublewide6

LawnSite Senior Member
tore her down. Removed sump looked very good same with lower end of crank. With sump removed I can wiggle the top end a bit. Does this engine have a bearing up top? I'm still thinking problem is going to be with the block and not the crank? I will remove flywheel and top tomorrow. Do the blocks wear away up top or is there usually damage to they crank?
 
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Doublewide6

LawnSite Senior Member
This is the sump. You see the groove where the oil hole is? Should that groove/ledge be there? The pics show it from both sides. Also came looks a little burnt, but no scoring or anything is the Cam OK? Thanks
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hal

LawnSite Fanatic
Location
Georgia
It looks like it is for oil circulation.
 

Breezmeister

LawnSite Silver Member
Location
South Jersey
Wow :eek:

There was a lot of heat in there.......

I guess you could short block that engine if it's available... Check the heads for flatness. Do a search for @piston slapper, he goes into how to check and fix them if they are warped.....

Personally, if that was in my shop, I'd just replace the engine.......
.
 
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Doublewide6

LawnSite Senior Member
It looks like it is for oil circulation.
Can anyone tell me definitely if the groove is needed in the sump? I thought it was factory, but I haven't seen a picture of any Kohler sump with that groove. I'm thinking the groove would cause endplay and oil to leak from the bottom seal. I think the new cam is needed and I will look into the heads being flat. Thanks All.
 

65t

LawnSite Member
Location
wisconsin
Grove is not supposed to be in the lower main bearing in the oil pan. Chances are if you look at it, the grove is probably in the direction of belt tension. I wouldn't worry about the camshaft, that style camshaft is usually that color. Order a new oil pan and reassemble it and check to make sure your belts are not too tight.
 
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