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Wanted to update this post. I replaced the rods with new. When I removed the crank I found the flywheel side of the crank bearing surface in the upper case was probably the aluminum culprit. I've attached some photos. I carefully cleaned it up (last two photos). I did not check clearance...

General consensus that I got from two other engine guys I know (though automotive). I guess I'm pulling the heads so I can get these assemblies out, then, and change out the rods. Thanks for the feedback!

Got access to the rods. Top side definitely shows wear. This looks like where the aluminum shimmer may be coming from in the oil? I'm used to regular rod bearings so not sure how to read this - straight aluminum. Thanks!

Clean most likely due to Mobil 1 being used since new with <100 hour oil changes. My experience is that synthetic oil motors just look cleaner inside. I'm wondering if the top side of the case/crankshaft can have a problem. Other than that, the only remaining place I think could be an issue is...

Adding some photos. Best as I can tell all these surfaces look just fine. Note I have a photo of the camshaft gear and you can see small aluminum glitter on it. Last two photos show the oiling hole is clear. Anyone see any issues in these photos that I'm missing? Do I need to pull the heads and...

Absolutely did. I have a lot of automotive experience; just not small engine.

Alright got the mower out and on the bench today. Pulled the pan. The oil seal is about 1/8" prior to the oil feed, so there is no obstruction. Off-hand I don't see anything obvious though I have not done more disassembly beyond pulling the crankshaft (looks fine). Just for context again, when...

Again I don't have experience with these motors. Is this something that can continue to run fine for a few hundred hours, or will it grenade quickly when it starts to show glitter in the oil? Thanks.

Original motor is a CV740-0011 (in a Gravely PM260Z 992047). Kohler's updated motor would be a CV742-3023. Parts change - regasket and seals. A few external updated parts (like oil breather plate if I recall). Nothing internal was replaced. I looked at the Kohler parts diagrams and yeah ... no...

I have a CV740-0011 that is about 15 years old. Been in my possession since day one. Mobil 1 oil changes, etc. A few years ago blew a seal. I pulled the motor, regasket, updated parts. The cross hatch looked like new in the cylinders. I thought everything inside looked good. Flattened both heads...

Yes I saw the parts diagram. The sheave is raised on both sides - one more than the other. That shows one side so it's a guess which side of the sheave is drawn.

I posted this on a detail thread I'm working on, but realized it should probably be a standalone question. I am installing the hydro pulley (sheave) on my PM260Z (Kohler CV740 engine). The pulley is asymmetric - it has an offset on both sides of the pulley that are different dimensions. Does...

Working on reassembly and will provide a full report once I'm done. When installing the sheave (pulley) for the hydro belt, on the crankshaft, the pulley is asymmetric (taller offset on one side). I've dug through Gravely and Kohler manuals and cannot find anything that confirms the...

Ok here is what I found, using above images. Paper diagrams are from original factory manuals that came with the mower when I bought it. On the PTO switch ... 3-9 works as shown in the diagram - continuity when disengaged. I'm not sure what the deal is with the numbers swapping in the "1 4 7"...

Ok ... decided I should dig into the electrical system some before going any further. I could use a second opinion or two on what I'm finding. The summary is that my 2 year old PTO switch seems to not be happy. First I unplugged the diode and tested with multimeter ... tests as a one-way valve...

2005 Gravely PM260Z 992047 first gen production (00101-01499). Mine does seem to have the diode inline, but I can confirm.

Thanks for the input, most appreciated. I pulled the motor this morning. Plan to open it up and check. 50 ft lbs of torque on the crankshaft and it would not turn, with no belts on it. Something seized. I'll see what it is today. You are correct heat rises. But it also propagates across...

OK here's the story in case it helps someone else. Mower ran fine, shut down PTO, rode back to the house and shut off. PTO extremely hot to the touch. Once cool, motor which had been running great refused to start. PTO tested 2.5 ohms but would short on a back probe. So PTO was bad. Replaced...

Sorry should have been more clear when I said new electrical system. New battery this spring, as well as new voltage regulator. Battery was also put on a charger, registered full charge 5 minutes after connecting. The starter kicks hard. The crankshaft attempts to turn (like 1/4") and stops.

This machine has the Kohler OHV. Motor runs great - rebuilt it two years ago. Rebuilt deck as well, most electronics replaced. Fuel system replaced. Has run well for a good while. Was mowing last week and PTO shut off about 10 minutes into the mow. Motor and hydraulics continued running fine...

Hi all, hoping someone can help. I disconnected my throttle linkage during a repair and did not snap a photo prior. While I have all the factory manuals, none discuss the throttle linkage. Of course it is unique to this series of motors. Mine is specifically the 992047 model with the 27HP Kohler...