Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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I have a KOHLER COMMAND 17.5 SCOTTS Lawn Tractor. I need to know the size of the spark plug and the size of a spark plug wrench to remove it. Don

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  • carter01377 Aug 21, 2010

    The engine is in a Scotts Lawn Tractor Manufactured by John Deere. The Model # is CV491S. The serial # is: 3206802173.

    The plug has been in the mower engine for about 1 1/2 to 2 years. I need the correct wrench to remove the current plug so I can clean it. I want the spark plug part # so I can purchase a spare.

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I need to know the model number and engine description to get you the correct spark plug part # for example it is a twin intek briggs & stratton 17.5 hp 2003 model #....etc.
Cant guess on this wrong plug can damage the engine.
What plug make and number is in the hole right now and was it running on that particular spark plug for a long time?

Posted on Aug 21, 2010

  • JOHN DAVIDSON Aug 23, 2010

    any markings on the engine as to who makes it....Briggs/Stratton Etc.?

  • carter01377 Aug 25, 2010

    Th engine is KOHLER COMMAND 17.5, Model # CV 491S, SER # 3206802173. It is in a Scotts Lawn Tractor manufactured by John Deere.

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1 Answer

Where is the spark plug?


The spark plug will be located on the engine under a rubber "boot". Remove this boot and you will see the spark plug. The boot is attached to the spark plug wire, you should be able to spot it pretty easily.

Grip the boot and pull it off, it will have a little resistance, but it should come off with no problem.

You will need either a spark plug wrench or a deep socket wrench to remove the spark plug itself.

Only use the tool the loosen it, then use your fingers when you can.

Good Luck!

I've added a link to a post about how to change the spark plug on a lawn tractor, unfortunately, it is not John Deere, but it should be very similar!

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1 Answer

Where is the spark plug located on my craftsman lawn tractor model 917.273360


James, it is at the front of the engine. It is next to the 4" by6" metal cover that says OHV. It is on the right hand side ( sitting on the tractor), There is a black wire the size of a pencil ( diameter ), hooked to it. It is set deep in the engines cylinder head. There is a rubber boot over the end of the spark plug. Remove the rubber boot, you will hace to grip it hard and pull it off. Then you will be able to remove it, using a deep 5/8" socket with a 4 to 6 inch extension.

Hope this helps, if you need more let me know.
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1 Answer

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Have you checked for a bad head gasket?

Check the intake valve springs or the intake valve shafts to be sure they aren't stuck open. Another cause could be excessive carbon build up on the intake valve causing them to not seal.

If you've gone this far, you could try a compression leak down test. If you still have the push rods out, you can use or get an adapter that will allow you to pressurize the cylinder(s) with air by removing the spark plug. Apply 70-80 psi air directly to the cylinder (the cylinder may go to BDC (bottom dead center) but if you don't have any push rods, the valves can't open.

Listen carefully - if you hear air leaking out of the carb, it's a bad intake valve. If you hear air from the exhaust, it's an exhaust valve. If you hear air from the crankcase breather, it's piston rings.

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