2004 Fatboy, 32,000 miles.
Is the primary and transmission sharing the same oil ??
Or is it separate. I just drained and chnged the Transmission oil, and this morning my primary is leaking a little....is that because I over filled the Transmission oil. It says it takes 1 qt. and that's what I put in.....my primary hadn't been leaking previously.
I figure to split the primary, clean it up and replace the gasket.....should I now drain the the Transmission oil again to do this ?
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Which of the three drain plugs. Primary is on primary case below derby cover; transmission is on right side middle bottom of transmission, engine is at bottom of right rear frame down tube intermediately forward of rear tire. ALL are 5/8 inch hex plugs with 1/4 inch Allen socket in the middle of the plug.
Yes the primary case-transmission require it's own oil as the lubricant for this area is not provided by the engine oil. There is a drain plug located at the lower point of the case. Remove the plug and drain any oil that may be in the primary case. When finished, add one quart of oil to the case through the access hole at the top of the primary case where you check the tension on the primary chain.
I'm not a Twin Cam mechanic but I think there are two oil drains on the bottom of the transmission. The oil tank for your bike is on the bottom of the transmission. It looks like there is a drain on the bottom of the pan and one on the front. The oil should be changed every 3000 miles if you're using petroleum based oil. Synthetic oil can go a bit longer. The primary oil and transmission oil should be changed every 5000 miles or so. The primary drains from a pipe plug underneath the primary back near the rear of gearcase. The transmission drains from a plug underneath.
You engine uses three quarts of 20W50 oil. The primary and transmission share the same oil and it uses about a quart of oil. One the late model Big Twins, you can use H-D's Syn 3 in all areas. Not sure about the Sportster. I've always used the H-D primary/transmission lubricant for Sportsters. If you wish to use any other brand of lubricant, you need to go to their website and check to see what they say use in what area. Some of the other popular lubricants are Amsoil, Royal Purple, Mobil V-Twin, and Red Line.
Usually the oil drain is one the left side of the bike somewhere below the battery. Look for a hose that has a plug in it or one that connects to the frame. Harley had moved this drain so many times in the past that it's difficult to keep up with where the oil drain is located. The transmission and primary share the same oil. To drain it, find the drain plug on the bottom of the primary just below the clutch. Pour the new oil in the primary chain inspection hole of the primary.
The oil drain plug is on the bottom of the transmission as the oil tank is located there. Usually the drain plug is the one closest to the left front of the pan. Drain the oil, change the filter, and add fresh oil. To change the primary, locate the small pipe plug on the bottom of the primary directly below the derby cover and remove it. Drain the oil, remove the derby cover, and stand the bike straight up. Fill the primary with oil just until it comes up the bottom of the outer clutch drum. Do not overfill. To change the transmission lubricant, locate the pipe plug on the front of the oil pan on the bottom of the transmission. Drain the oil and refill though the plug and dipstick in the chrome release cover on the right side of the transmission. Add 20-24 ounces of oil.
The oil drain on your Sportster should be on left side of the bike below the battery around the rear of the primary case. It'll be a short piece of hose with a metal plug in it or a hose that appears to plug onto the frame. Simple pull the plug or take the hose loose and the oil tank will drain.
On the transmission, you remove the top inspection cover of the primary case to add the oil to it. The primary and the transmission share the same oil.
On the bottom of your transmission, there are two drain plugs, one for the transmission and one for the engine oil. The plug in the center is the transmission drain plug and the one toward the left front is the engine oil drain. The primary drain is a small pipe plug that takes a Torx wrench located at the bottom of the primary cover towards the rear of the bike.
Engine oil three quarts with filter. Then start the bike and let it run for a few minutes. Shut down the engine and check the oil level with the dipstick. The dipstick has two marks on it. "Full Cold" and "Full Hot". Fill to the full cold mark.
Transmission takes 20-24 ounces of oil and the primary takes 38-44 ounces of oil. Do not overfill the primary as it will cause your clutch to drag. All three sections take H-D Syn3 20W50 synthetic engine oil.
Look at the bottom of the oil tank from the right side of the bike. You'll see one hose or pipe that goes downwards towards the back of the transmission. The hose will follow the frame and come out way down low on the backside of and slightly under the transmission. There is a plug in the hose or pipe. Take the plug out and the oil tank will drain.
To change the oil, drain the tank, change the oil filter, refill with three quarts of oil in the tank. You also have oil in your primary that should be changed every 5000 miles or so, and the transmission serviced at the same interval as the primary.
To drain the oil on the primary, there is a drain plug under the primary case at the very rear of the case. Remove this to drain the case. Refill the primary through the derby cover. Fill with oil until the level is just to the bottom edge of the clutch spring. 38-42 ounces of oil. Do not overfill or the clutch will drag and make finding neutral with the engine running impossible to find.
To drain the transmission, there is a small plug on the bottom side of the chrome cover on the right side of the transmission. Remove the plug, drain the tranny, and refill through the large plug that takes a hex key in the chrome cover. 20-24 ounces of transmission lube.