Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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Engine wont turn over. too much compression. ehaust valve is opening. new starter and battery.take out plug and it will start. put back in , nothing

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Jtd ride on mower wont start will turn over a little but if i take the sparkplug out it will turn over no problem any ideas please

Posted on Aug 30, 2009

  • Dennis Key
    Dennis Key Feb 20, 2014

    Adjust valves


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Diagnose it as a starter that won't turn under load. low battery charge, bad connection. Solenoid not making good contact.

Posted on Jun 16, 2009


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2 Answers

Starter kicks in but wont turn engine acts like too much compression,battery is fully charged

Very can be if it is an OHV engine that either the valves are needing adjusting or the decompressor has failed.

Most 4 cycle small mower engines have decompressors to help with the starting, These are only active at start-up and does not effect normal engine compression when running.

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I replaced the engine on my 1976 chevy c-10 350. i put all new pumps. new altinator, new starter, new battery, new spark plugs, reset the timing, and all new fluids. But it wont start. It acts like it...

Now it's time to become the gearhead in you and get this critter moving. The engine needs fuel, compression, and ignition (spark) to run. You must have heard the steady whuff, whuff, whuff of the cylinders pushing air out the sparkplug holes when you cranked it over with the plugs out, right? That was a good test of compression, if nothing else. Now look down the carburetor throat (with air cleaner removed) and operate the throttle with your hand. Does gas squirt down when you open the throttle plates. If it does, you know the engine is getting gas. The next thing is to check your ignition system-start at the spark plug and check for spark.-your '76 is heavenly simple compared to later models-but a good place to learn the basics. Still, I'd recommend buying a Haynes or Chilton repair manual for your truck. It can lead you step-by-step through any procedure you want to try, including the very problem you are having. .
Good luck.

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The starter won't completely turn over even though

Sometimes on the Briggs and Kohler engines, the compression release fails to operate at the proper time or is malfunctioning. A remedy for this is to remove the valve cover(s) and adjust the OH valves per the manufacturers specifications. This enables much easier starting, produces less wear and tear on the starter and may allow your new battery to completely turn that engine over. Out of adjustment valves mimic a weak or failing battery quite well and the engine hangs up on the compression stroke because the compression release system is not working properly. Adjust those darn valves.

May 15, 2011 | Toro Titan ZX5450 (54") 25HP Zero Turning...

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The starter turns the motor over very slowly, but motor will not start.

If the engine is turning over too slow, the engine will not start. Try either charging the battery first or attach a charger while starting. If it is still turning slow, the starter may be drawing too many amps and need to be replaced.

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My Toyota Camry 96 isn't starting. New battery the alternator and starter are working properly and there are new spark plugs . The engine is turning over and it's getting fuel but it just doesn't start....

Faulty MAP or MAF sensor, EGR valve stuck open, spark plug wires don't match firing order, large vacuum leak to intake manifold, very dirty fuel injectors, idle air control valve defective, poor compression in cylinders due to incorrect valve timing or leaking fuel injector o-ring seals.

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2004 John Deere 118 tractor, 22HP Intek engine. New battery, but still won't turn engine. I can manually turn it by the pulley but the starter just clicks....when it did work, the starter took a couple of...

It sounds like a starter problem. If the starter was used heavily -long runs or multiple times to start the engine- it could be shorted. Overheating is the enemy of the starters and happens when a starter is used hard to start a balky engine. Repalcing the starter isn't a big job and many B&S engines use the same starter. Find a working starter, replace yours with it and try to start the engine (with clean plug and full battery.)

It is also very possible that the compression relief valve is malfunctioning. It s mounted on the cam shaft and opens the exhaust valve to bleed compression from the cylinder(s) when starting. When it doesn't hold the valve open the starter can't throw the cylinder past top dead center TDC) to relieve compression. The work around is this: turning the pulley manually past TDC will allow a good starter and fully charged battery and clean plug to turn the engine and fire.

B&S has a high failure rate for the compression relief valve and states that the valve clearances are critical for the valve to function properly. And when the engine is worn and valve clearances are set right but it still malfunctions... the company has various reasons why YOU caused the problem.

Replacing the compression relief valve etc takes 3-5 hours and at $65+/hr you can see what the cost is- not including the relief valve which costs somewhere around a $100 (more for larger engines.) Even after replacement, it might not fix the problem.

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Acts like the battery is low. put a new battery on it. if u keep turning it it will start occasionally. the starter was replaced and the ignition switch. didn't help. starter gets very hot when trying...

if its a overhead valve engine (briggs) adj valves to .002.or u may have a bad decompression mechanism.the compression in todays engines are too high for starter to turn over with out letting some compression out nomatter what brand. hope this helps

Aug 15, 2010 | Toro Lawn Mower With Toro Power Tools

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Starter get hot engine won't start. When I remove the spark plug and put the plug back in the wire and crank it I can see the spark but when I put the plug back in and try to crank. It won't crank very...

You likely need to get the valves adjusted,it sounds like the decompressor is not working.You need to get the compression down to 130 lbs while cranking or the starter can't overcome the compression.Try turning the motor past the compression stroke by hand and see if it will crank faster,if so then the decompressor is out of adjustment.If the decompressor is not just a lob on the valves then you need to call the repair depot for craftsman and find out what you need to do to fix the problem.If none of the above works then you may need a battery,or just clean the cables and battery posts.

Apr 19, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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I have a briggs and strattan 18 horsepower engine on my craftsman mower and it wont start, i replaced the starter and it still wont start! It wont even turn over, in fact it binds the starter, but if I...

Have the battery tested at an auto parts store to ensure there is enough power in it. Sounds like it's strong enough to turn the motor with no compression (spark plug removed) but too weak to turn the motor with compression. Also check for loose or corroded wires.

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