12
should be 33 mm
.030
The spark plug gap for a Murray 12 hp riding lawn mower should be set at .020 inches. This is equal to .5 mm.
Mercedes c240 has 2 spark plug each cylinder total 12 and gaping is 0.039 when you purchase them they have ready gap on it. always good to double check them.
If it is a horizontal crankshaft the gap is .030 if it is a vertical crankshaft it is .020
Following information was found by a Google search on 12 July 2008. The posting was made on 8-8-2006 to a user forum at forums.trailvoy.com here are GM's specifications for spark plug gap for 2002 trailvoys. what year and model is your truck? ~2002 Envoy & TrailBlazer 2WD & 4WD~ Spark Plug Torque 18 N.m Spark Plug Gap 1.27 mm Spark Plug Type AC 41-965 Spark Plug 17-23 N.m ***Updated my own posting after working on my Trailblazer*** The 18 NM torque is stamped onto the top of the engine, visible after removing the air box.
Spark plugs receive electrical power from the ignition system. This uses a transformer (the coil) to change 12 v power to several thousands of volts. This high voltage current is carried to the plugs by the plug wires. When the electricity jumps the gap between the electrodes of the plug, it makes a spark.
Per Service Manual - Spark Plug Gap is .040" - Plug is Champion L77J4 Fuel Mix is 50:1 or 12 gallons Gas to 1 quart TC-W Outboard Motor Oil
Spark Plug - 1936 was released on: USA: 12 April 1936
Remove the engine covers and carefully remove the ignition wires from the spark plugs, there are 12 of them, then remove the spark plugs with a 5/8 plug socket. Make sure the gap is correct on new plugs put a bit of anti seize on the threads then install the new plugs...
To be totally honest, if you do not know how to change spark plugs, you should consider finding a friend to help you, since there is more to it than just "replacing" them. When you open the hood, right in front of you will be the spark plug wires, coming from the engine. The black wires, four of them, snap onto the spark plugs. Make sure you have four new spark plugs, a spark plug gapping tool and a spark plug socket (5/8" deep well socket with a rubber grommet inside.) Pull one spark plug at a time (I usually start from the left and work to the right.) You pull the spark plug "boot" (grip as low on the "boot" as you can when pulling up on it- you may want to purchase a plug wire boot puller for about $12.) Then place the socket onto the spark plug (into the cylinder) and ratchet it loose. Before placing the new plug in it's place, make sure you "gap" the plug to .39mm (use a gapping tool - if you gap it too much, the engine will run choppy; too little gap you will burn up the plug.) Follow these steps for each plug, doing them one at a time. Easy task really. Also, spend the $25 to buy a Chilton repair manual. It will give you pictures and step by step instructions for pretty much any repair. It also gives specifications for fluid volumes, types of fluids, spark plug gap, etc. Well worth every penny the $25. Best of luck to you!