I have a 2005 (new to me) Road King. I just changed all of the fluids, (engine, tranny and primary) and put in synthetic (Amsoil). When I changed the fluids I made sure to put new o-rings on each plug and even bought a new plug for the primary drain. Now I have leaks, it appears to be several. I am having trouble determine where it is leaking from and what to do to stop them. At first I thgught it was the primary plug. I seem to be getting a drop coming from that area, so I tightened it up a little more and it still leaked. I then went and bought a new plug since the old one was almost striped in the hex head from prior tightening. I put that plug in and I am still gettng oil coming from that area. Do i need to put anything on the threads of the plugs when I re-install them. I have not done that on my other motorcycles and never had a leak? Could it be that it is leaking from somewhere else and just running down to the lowest spot which just happens to be the primary drain plug? I really don't want to take this in to a mechanic when the purpose of doing it myself was to save money. Any help, advice or insight is greatly appreciated. I know it is hard to determine where a leak is coming from based on my description and if I had a motorcycle table I might be able to get up under it better to find it. My jack just seems to get in the way of finding the leak.

Thanks,
Mike

 

I am new to HD as well. I bought the "Fix my Hog" DVD and I am trying to remember what they said on it.

But on some of the "Bolt Threads", they put on Teflon Paste. I just don't remember if the paste was being used on the fluid drain bolts or not. I will have to go back an look at the DVD.

 

Us Teflon pipe dope on the primary plug and do not over tighten. I believe I read it is a tapered hole for the plug and you mentioning that the old one was almost stripped on the hex makes me wonder if someone used bad tools or gorilla fisted it. If you don't have a feel for plugs and torque use a torque wrench properly set on the transmission plug and oil drain plug. For the repair manual torque specs. If you over tight the transmission plug or oil plug ---you can kink or cut the orings. If you screw up the drain plug threads on the primary----you only have two real options. Replace the cover or do some cheap engineering.

 

I use teflon tape or paste on all mine with or wiithout o-rings.. they never leaked. If your primary is the pipe plug type with no o-ring then you need to use teflon on it and like others said do not over tighten it.. make sure you lube the o-rings so the side and don't tear..

 

Okay, maybe I have over tightend it. I will get my torque wrench out and do it properly as well as using some teflon paste or tape. The threads are still good on the primary, I may have just tightend it too tight and pinched the o-ring. I'm a computer programmer by trade and I should probably just stick to that, but I like to get my hands dirty from time to time.

 

Be careful with a torque wrench on drain plugs, I use instinct to tighten those plugs.
I have used teflon paste on the threads in the past, can't hurt. If you get a can of brake cleaner to clean up the suspected leaking areas and use a mirror maybe you'll find the source.

 

another suggestion, after you clean the area with brake clean and its dry...take some baby powder and get it on the suspected area...might locate leak that way. hope something not to serious. good luck

 

Synthetic oil will find a leak long before dino oil will. The teflon should fix your drain plug issues but if it still leaks at gasket joints, you might have to go back to dino.
Hatch.

 

Why put up with a leak and use an inferior oil instead of replacing gaskets? Everything I read about synthetic finding places to leak or weep. Happened because of surface fit or bad gaskets .

 

Just thinkin'...........It's the first day of summer, A guy could pull his engine all apart or he could ride until winter!
Dino oil still gives great protection without robbing you of all your gas money.
Hatch.