How To Do Complete Engine Service On A John Deere L100 Tractor

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Today we will be showing you how to do a complete engine service on a John Deere L100 lawn and garden tractor. This will work for the L100, L110, L120,L130 it may be a little different between them as they may have different options. We are showing you this on a John Deere L100 with the 5 speed and the 17HP briggs engine. We are going to be using the LG239 Maintenance Kit to replace the oil,air filter, fuel filter and the spark plug. If you don’t have the owner’s manual and need to find out the correct maintenance kit on most mowers there is a sticker or plate. They are either stuck to the bottom of the seat on the older ones and on the newer ones they are stuck to the underside of the hood or somewhere in the engine compartment.

The first thing we need to do is start the mower and let it run 2-3 mins to get the oil hot making it easier to drain. Once we have the engine warmed up we can grab a pair of gloves if you want and we place our drain bucket under the drain tube on the passenger side. With the drain bucket in position we can grab and turn the drain cap clockwise to align the pin with the track and then wiggle the cap off. The Oil from the engine will be HOT. Once we have the drain cap off we can open the oil fill cap to let more air in so the oil will drain faster.

Now that we have the oil draining we can move onto replacing the air filter. So well switch sides. Right on the top of the engine is the air filter box. Well need to grab the handle or lock and lift up and rotate it backwards to unhook the air filter door. Once we have it un-hooked we can let the door fall forwards. You can remove the air filter door by moving the throttle cable out of the way and lifting upwards on it to remove the two lower pins.

Once we have the air filter door out of the way we can grab and remove the old air filter. Once we have the old air filter removed we can clean both the air filter box and cover. With those cleaned up we can grab and unpackage our new air filter and set it in the air box. Once we have the new filter in we can reinstall the air box door. Align the bottom pins and slide them in then we can rotate the door upwards and then lastly clip it shut making sure we hear the click to be sure its sealed.

With the air filter replaced we can move onto the inline fuel filter. It’s located just below our air filter and our fuel pump. Next we need a pair of needle nose vise grips or hose clamping pliers and a pair of needle nose pliers to crimp the fuel line coming from the fuel tank. We do this to stop the flow of fuel and to hold the fuel line from falling through the frame. Once we have the fuel line crimped we can grab the needle nose pliers and squeeze the hose clamps and slide them away from the fuel filter. Then we can grab the fuel lines with our hands and twist and pull them off the fuel filter. You may want to put a rag under the fuel filter as gas may come out of it. With the old fuel  filter removed we can grab our new one. I’m not a fan of the one that came in the kit ( Kit One ) so I ended up buying another style inline fuel filter to use ( New one ). It’s a bit bigger and it’s clear so we can see how dirty it is. We’ll take the new one and hold it in position and then slide the fuel lines back on to each end of the fuel filter. NOTE which way the arrow is on the fuel filter as that is the direction of flow. So that arrow needs to point towards the fuel pump. With the hoses connected to the inline fuel filter we can grab the needle nose pliers and squeeze and slide the hose clamps back into position. Once we have the clamps back on we can remove the needle nose vise grips/ hose clamping pliers.

That’s it for the fuel filter and we can go back to finishing the oil. Well wipe down the drain tube and install the drain plug cap back onto it. Sliding it onto the drain tube and then turning counter clockwise to lock it in position. With the drain plug cap on we can move the drain bucket over to the oil filter if your mower has one and remove it with an oil filter wrench. Then put some new oil on the seal of the oil filter and thread it on. Well only go hand tight. 

With the oil filter replaced we can now refill the engine with oil this one calls for 10-30W tuff guard oil. This engine will take a Quart and a half to get it to read full on the stick. So well grab a small funnel and place it in the oil fill. With the funnel in the filler tube we can grab our new oil and fill the engine. 

Once we have a quart and a half in the engine we can check the oil level. This one is right where it needs to be. Next we’ll start the mower and let it run for a minute to fill the oil filter. Then we can wait a minute for the oil to settle and then well recheck our oil level and add till we get to the full line on the stick.

Now that we have the proper amount of oil in our engine we can move onto replacing the spark plug. To start well grab the boot of the spark plug wire and pull it off the spark plug be careful as it is right next to the exhaust. If you have trouble getting it off you can use a flat screwdriver to help. With the wire/ boot off we can grab a 5/8 spark plug deep socket and a 4”-6” extension and a ⅜ ratchet to remove the spark plug. Once we have the old plug removed we can grab the new plug and a spark plug gap setting tool. The spark plug is a Champion RC12YC or a Briggs 491055T . We’ll take the gap tool and set the spark plug gap to .30. Once we have the gap set we can install the new plug by hand to ensure we don’t cross thread it. Once we have it hand tight we can grab a torque wrench and set it to 20lbs and torque the spark plug.

With the spark plug torqued down we can reconnect our wire. With the spark plug wire connected we’ll start the mower again. Then well check the oil drain cap and the fuel filter to ensure that there aren’t any leaks. So with no leaks that’s it for the engine service.

Some other things you will want to do is grease the front end. There are 5 grease points on the front end. One on each spindle one on each front wheel and one in the center of the tractor. Then you can grease the two pulleys that have the deck blades attached to them. They are under the black cover. So you will need to remove them to get the grease gun in to grease those pulleys. You can also grab a can of white lithium grease and spray the rest of the pulleys and pivot points on the deck. You will want to also remove the deck blades and sharpen them or replace them. You will also want to add some sort of gas stabilizer to keep the gas fresh and so you won’t have to deal with a gummed up carburetor. 

So with the spark plug wire on that’s it for the complete engine service and with the added items we talked about that should keep your mower in tip top shape and ready for the next mowing season.


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