Change Your Mercruiser Engine Oil

#Read your Owners Manual and its Safety Precautions.[[Image:Change Your Mercruiser Engine Oil Step 1 Version 2.jpg|center]]
#In general, you need to change your oil every year or every 100 hours of use, whichever comes first.[[Image:Change Your Mercruiser Engine Oil Step 2 Version 2.jpg|center]]
#Visually inspect your engine and check the oil before starting.[[Image:Change Your Mercruiser Engine Oil Step 3 Version 2.jpg|center]]
#Make sure the prop has been removed and that no people or pets are near the stern drive or prop before starting the motor.[[Image:Change Your Mercruiser Engine Oil Step 4 Version 2.jpg|center]]
#Check for fuel or fuel vapors outside or in a well ventilated area to prevent Carbon Monoxide poisoning to people.[[Image:Change Your Mercruiser Engine Oil Step 5 Version 2.jpg|center]]
#Make sure your engine has a water supply before starting.[[Image:Change Your Mercruiser Engine Oil Step 6 Version 2.jpg|center]]
#Be prepared for spilt oil. Cover your floor and cushions with old towels or blankets.[[Image:Change Your Mercruiser Engine Oil Step 7 Version 2.jpg|center]]
#Start your motor and let it warm up. This will warm up the oil and make it much easier to suck it up and out of your dipstick tube.[[Image:Change Your Mercruiser Engine Oil Step 8 Version 2.jpg|center]]
#Turn the motor Off. After the engine has run long enough to reach operating temperature turn the motor off and let it cool for a few minutes.[[Image:Change Your Mercruiser Engine Oil Step 9 Version 2.jpg|center]]
#Remove the dipstick and thread the oil hand pump onto the end of the dipstick tube. If you are using an electric oil changer bucket hook up the hose to the tube and attach the pumps wires to the battery (red is positive and black is negative).[[Image:Change Your Mercruiser Engine Oil Step 10 Version 2.jpg|center]]
#Suck out your oil into a container. Mer cruiser dipstick tubes are also Oil Withdraw tubes. You can suck all the oil out of the engine through the dipstick tube. This requires the use of either a small hand pump (part 802899A1 Oil Pump which can be purchased online or you can buy a more expensive Oil Changer Pump/Bucket Assembly from a marine supply store (about $160.00 and up).[[Image:Change Your Mercruiser Engine Oil Step 11 Version 2.jpg|center]]
#Replace the oil filter.[[Image:Change Your Mercruiser Engine Oil Step 12 Version 2.jpg|center]]
#Use the correct filter wrench and remove the old filter. Turn it counterclockwise as viewed from the bottom end of the filter. In some cases the filter might be difficult to remove. This is usually because it had been over-tightened when installed. A good wrench and patience usually prevails but in some cases you have to drive a large screwdriver through the body of the filter to get it off.[[Image:Change Your Mercruiser Engine Oil Step 13 Version 2.jpg|center]]
#Once the filter is removed use a lint-free towel and wipe off and inspect the filter mounting area. Make sure that the old filter o ring has been removed from the engine.[[Image:Change Your Mercruiser Engine Oil Step 14 Version 2.jpg|center]]
#Compare the size and type of the threaded hole of the new filter to the old filter to make sure you have the correct type.[[Image:Change Your Mercruiser Engine Oil Step 15 Version 2.jpg|center]]
#Coat the o ring on the new filter with clean oil.[[Image:Change Your Mercruiser Engine Oil Step 16 Version 2.jpg|center]]
#Thread the new filter into place until hand tight.[[Image:Change Your Mercruiser Engine Oil Step 17 Version 2.jpg|center]]
#Use the filter wrench to tighten another 3/4 of a turn and no more! Over tightening the filter makes it very difficult to be removed.[[Image:Change Your Mercruiser Engine Oil Step 18 Version 2.jpg|center]]
#Look up your engine oil capacity in the owner's manual or on the capacity decal on the engine. Most inline 4 cylinder engines take 4-5 quarts. Most V6 engines take about 5 quarts. Most V8 small blocks take about 5 quarts and Big Block V8's can take up to seven quarts depending on the exact model.[[Image:Change Your Mercruiser Engine Oil Step 19 Version 2.jpg|center]]
#Fill the engine with the correct amount of oil. Newer Mer cruiser engines use a Color Coding System to locate and identify the oil fill cap and dipstick. Mer cruiser uses yellow to identify oil service points.[[Image:Change Your Mercruiser Engine Oil Step 20 Version 2.jpg|center]]
#Let the motor sit for 5 minutes before checking the level on the dipstick. This will allow the new oil to drip all the way down into the oil pan.[[Image:Change Your Mercruiser Engine Oil Step 21 Version 2.jpg|center]]
#Remember that the filter will hold some oil too.[[Image:Change Your Mercruiser Engine Oil Step 22 Version 2.jpg|center]]
#After you are done filling install your oil fill cap and perform a general inspection on the engine. Make sure the filter has been installed and that you have cleared the engine area of all rags and tools.[[Image:Change Your Mercruiser Engine Oil Step 23 Version 2.jpg|center]]
#Supply a water supply to the motor and start the engine.[[Image:Change Your Mercruiser Engine Oil Step 24 Version 2.jpg|center]]
#Immediately inspect the oil filter while the engine is running. Look for any oil leaks. Go to the helm and observe your oil pressure gauge for a proper reading.[[Image:Change Your Mercruiser Engine Oil Step 25 Version 2.jpg|center]]
#Let the engine warm up to operating temp.[[Image:Change Your Mercruiser Engine Oil Step 26 Version 2.jpg|center]]
#Turn off the motor and let it sit for 5 minutes.[[Image:Change Your Mercruiser Engine Oil Step 27 Version 2.jpg|center]]
#The manual that came with my mercruiser says to check the oil level with the boat "at rest in the water".[[Image:Change Your Mercruiser Engine Oil Step 28 Version 2.jpg|center]]
#Remove and wipe off the dipstick and check the oil level again.[[Image:Change Your Mercruiser Engine Oil Step 29 Version 2.jpg|center]]
#Add more oil if needed. In general one quart adds about 3/8" on the dipstick. This can vary from model to model, though.[[Image:Change Your Mercruiser Engine Oil Step 30 Version 2.jpg|center]]
#Clean up your mess and go boating![[Image:Change Your Mercruiser Engine Oil Step 31 Version 2.jpg|center]]

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