Riding Lawn Mower Repair Manual Craftsman
Leroy Swann, I'd you have oil coming out of your exhaust, there are 3 possibilities. 1: your head gasket is broken (easiest fix but mostly never the problem). 2: you have a stuck valve and oil is spilling into your combustion chamber. There are two valves on the head of the engine. One let's the fuel into the combustion changer while the other let's out all the gases after the fuel has been ignighted. If one is stuck closed it is building up way too much pressure which spill oil into the combustion chamber. Oil is hard to ignite and ends up leaking out of the exhaust.
( sometimes the problem) 3 ( most of the time and what happened to mine) in you combustion chamber, thereal is a piston that moves up and down to compress the fuel to ignite it and release gasses to the exaust. On that piston is 5 or 6 rings.
If the rings end up going out oil leaks onto your combustion chamber. What I had to do once I had taken the engine apart is buy a new piston, rings, and a rod. The rod connects to the bottom of the piston to the crankshaft so the piston will move. When the rings go out, it caused the piston rub on the engine wall and take metal off the piston.
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Craftsman Lawn Mower Troubleshooting
Just a thousandth if an inch off will destroy the engine. Since the piston had metal rubbed off, it ran differently and took metal off the rod where it connects to the crankshaft. The piston, rod, and rings, and gasket kit ( GET A GASKET KIT EVERY TIME YOU TAKE APART YOUR ENGINE AND REPLACE THEM) cost me about $150 online. If you go to sears it costs a lot more. If oil is coming from your exhaust there could be two major internal issues, and one not so bad upper engine repair. The first is piston rings, the second is valve(s). The fairly easy fix is the 'head gasket'.
To check these options, you will need a cylinder pressure gauge. Screw it into the sparkplug hole and manually turn the crank until the highest pressure appears.
Then just watch it for a bit. If the pressure falls suddenly, you may want to consult a professional about rebuilding the lower engine. You definitely don't want to run it in that condition, because it could cause even worse problems later.
My guess is ring or valve job. Cost depends on what you are comfortable with. Good luck, I'll be praying for you and your mower. It's time to speak out for your right to repair We have a chance to guarantee our right to repair electronic equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation chance to protect local repair jobs—the corner mom-and-pop repair shops that keep getting squeezed out by manufacturers. Join the cause and tell your state representative to support Right to Repair.
Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!
Owner’s Manual LAWN TRACTOR 18.5 HR 42” Mower Electric Start Automatic Transmission Model No. 917.273642 m This product has a low emission engine which operates differently from previously built engines. Before you start the - engine, read and understand this Owner’s Manual.
IMPORTANT: Read and follow all Safety Rules and Instructions before operating this equipment. For answers to your questions about this product, Call: 1 - 800 - 659-5917 Sears Craftsman Help Line 5 am - 5 pm, Mon - Sat Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A Visit our Craftsman website.