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New to forum and new to Scag. Purchased a 2004 Wildcat with what appear to be a bad engine(knew that when purchased) Mower model smwc-61v serial b610094. Kohler 27 Pro

Family- 5khxs.7252gc
type- e11*9768SA*2002/88*0280*00
model- CV740s
spec no CV740-0021

I see engines all over the place and prices. Have even see where the spec cv740-0021 was superceeded by CV740S-3110. Went to my local Scag dealer today and they told me the current replacement is a CV 742 model. Can anyone assist me with getting the correct info. And possible best place to purchase. I'd rather unbolt and put the new on right back in. Rather than attempting to rebuild the current engine, putting updated electronics, etc. I'd have the same amount of $$$ tied up in it and alot of work. While I'm replacing the engine and don't know the service requirement of these mowers can you also give me a rundown of what else I should service while I'm doing this work. Thanks in advance for all the help and patience..I'm sure I'll have plenty of questions.

Thanks,
Todd

When I put the CV740-0021 into my dealer distributor site it supercedes to a CV742-3022

It is 15 years old, before spending money on the engine check the whole chassis and drive train for excessive wear and failed parts. Pay particular attention to belts, idlers, pivot points and the frame. Unfortunately you can't test the hydros without the engine running so that's a crap shoot.

Romore said:

It is 15 years old, before spending money on the engine check the whole chassis and drive train for excessive wear and failed parts. Pay particular attention to belts, idlers, pivot points and the frame. Unfortunately you can't test the hydros without the engine running so that's a crap shoot.

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Mower ran enough for me to get it on and off trailer. Hydros appear to work correctly. Mower is in pretty good shape. Mower was used by the local fire department to cut the firehouse grass at 3 stations. I know the person whom had it and know he takes good care of his equipment. But I will be going thru things to ensure it's all in good working order. And want to service the whole machine so I'll know where everything stands.

What are other service items I should look at while I have the mower apart? I want to change the hydro oil and filter. Which filter and oil? Synthetic oil? Check all belts, blades and spindles.

Got the mower all cleaned up and now have the motor off. Motor was locked up when removed and became unlocked once it was off and sitting on the ground. Can turn over by hand. I did find the carburetor was about to fall off. No nuts holding it to the block. Not sure if someone removed it or not. Also after cleaning I found the hour meter. It is currently showing 675 hours. And I believe it is inflated somewhat. Since when I picked up the machine the key was in the on position and with a dead battery. So it may have counted some hours until the battery was dead. I'm questioning why the motor is having issues with that low hours. But that really doesn't matter and new engine will replace it. So I've found a CV742-3022 as was listed above as the supersede engine for this mower for $1600 and change.. No muffler. Does anyone know if a different fuel injected motor would work and what would be needed to install one of the injected motors??

First thing I'd do - just me - is pull the valve covers and look for a dropped push rod. Might get real lucky, fish it out, replace it, and have a good motor. At those hours with routine maintenance the Kohler should be in good shape. But bad stuff happens sometimes.

Possibly the clutch was locked up from the start

tom3 said:

At those hours with routine maintenance the Kohler should be in good shape. But bad stuff happens sometimes.

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Unknown the maintenance on this unit. But I have an idea. Knowing what I know now

Luffydog said:

Possibly the clutch was locked up from the start

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Checked the clutch and its not locked up

Pulled the bottom of the motor off after zero compression on one cylinder. Boy did I find the problem. Connecting rod was busted into about 1000 pieces, crank scared up. Didn't go any further. Ordered new cv742-3022 engine. Arrived yesterday. UPS made a screw up and delivered another engine as well. They will return to my friends shop later this week to retrieve it. Hopefully it will be running by Friday evening. Also need to drain hydro oil and replace it and filter. Question. Use bolts taken out to secure the new block or do I need to top the new mounts?

The old bolts will be fine.
However a new engine should ship with new bolts & muffler gaskets.
If the holes are not threaded, do it before you install the engine.
If the engine bolts are self tappers, buy 5 new ones, use one as a tap and fit the engine with the 4 new ones.
The self tappers have a much shorter thred depth with a much rounder root as a thread cut with a regular tap will be loose on the bolts.

bertsmobile1 said:

The old bolts will be fine.
However a new engine should ship with new bolts & muffler gaskets.
If the holes are not threaded, do it before you install the engine.
If the engine bolts are self tappers, buy 5 new ones, use one as a tap and fit the engine with the 4 new ones.
The self tappers have a much shorter thred depth with a much rounder root as a thread cut with a regular tap will be loose on the bolts.

Click to expand...

Went ahead and just used old bolts. Replaced all washers and lock washers. Engine all installed but have a new problem. Old wiring harness for 740-0021 motor not same as the new 742-3022 motor. Engine cranks, fires but will not start. There is no power to the fuel shutoff solenoid. Without cutting up the wiring harness on the new motor and probably voiding the warranty I'm guessing their is a between harness that will replace the one off my old engine

Started another thread on wiring harness. Looking at new and old the connections were different. Fuel and starter solenoid on old were together. They are seperate on new engine harness. Used a jumper wire from starter solenoid to fuel solenoid and motor cranked right up. Now I need another between collector which gets power to new connectors on engine. Without cutting up new engine harness(hopefully)

I have a friendly Auto electrician who makes up crossover harnesses when I need one.
If you take photos of the plugs so they know what the plugs are and draw what you want clearly most will happily whip you up one for about an hours labour.
Some mower / engine makers supply grab packs of the plugs & terminals but I have not been able to get my hands on any of them.
However they are std automotive plugs but auto electrician grab packs are way too expensive for this little black duck when I will never ever use 99% of them.

Took a look at wiring and connections on old motor this morning. pulled back the protective sheeve on old motor wiring harness. What I though was a blue wire was actually purple under the sheeve. Did a little more re-configuring of wires this morning and she cranked right off. Cut about an acre of grass with no issues((except fuel) boy she likes a drink. But other than that its running fine, making plenty of power, charging systems putting out about 13.8. Now I need to work on a few other service items and a few other minor things.

Thanks everyone for all the help