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Compression Check

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Will P

02-28-2002 20:25:53




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What is the right way to check compression? Both plugs out and turn by hand? Hand start by the way. Run on one and check the other? Want to do it right and get the right numbers.

Thanks, Will P




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Clooney

03-01-2002 03:52:36




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 Re: Compression Check in reply to Will P, 02-28-2002 20:25:53  
Will, run the tractor until hot, then pull the plugs, then open the choke & throttle wide open, then install the compression gage. Then turn by hand until the compression reaches it's highest reading.
~Count the flywheel turns & run both sides the same number of turns, also see how many turns it takes to reach the highest reading on each side (they should be the same), the more turns it takes, the more ring wear you have. If it takes more than 2-3 you have wear on something. ~The first turn reading is also important on a hand start as that is the compression you have when hand starting, so it should be close from side to side.

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Dominic Centonze

03-01-2002 03:48:33




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 Re: Compression Check in reply to Will P, 02-28-2002 20:25:53  
I am a small gas engine instructor and avid John Deere collector. When we test single cylinder Briggs and Stratton engines (like the lawnmower style) first we run the engine for a minute to warm it up. Shut it off and remove the sparkplug. Screw in the compression gauge (they cost about $25 at any auto parts store) and pull the cord until the arrow no longer advances. I like to see about 90 to 95 lbs. of pressure in this type Briggs four cycle engine. Bear in mind every engine has its own range. Two cycle engines have dramatically higher readings. Now, let's say you want to test a hand start John Deere B. If it won't start to warm up, don't worry about it. Remove both sparkplug wires, then the left side sparkplug. Install the compression gauge (you may have to ask your parts dealer what to do about the thread size as some of the gauges are not big enough to screw into those large sparkplug holes. They also sell hand held gauges that you just push into any hole and a second person will need to turn the flywheel as you hold it in place). But spin the flywheel with it in place and when the arrow stops advancing, record the result. I found that after doing a ring job and honing out the cylinders, most of my letter series John Deeres give me a reading of about 75 to 95 lbs. of pressure- all very sufficient to fire off the engine. Good luck.

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