Removing and Disassembling the Crankcase |
Written by Randy Fox | ||||
Saturday, 03 November 2007 | ||||
IntroductionThis article is one of a series that describes how to disassemble, work on, and reassemble the Road Star engine. This particular document shows you how to remove the engine from the frame, and how to split the crankcases. It also describes how to remove the crank, transmission, and oil pump assemblies. See the Complete Engine Tear Down, Orientation article in this website for details. Be sure you refer to the service manual through all phases of this project. Taking the Engine Out of the FrameWith all the subassemblies removed, the remains of the engine can be removed quickly or slowly, depending on how many people you have to help:
Regardless of your situation, begin by removing the nuts for remaining motor mounts. There are two nuts at the very bottom of the engine (right-side), plus one at the front (with a bracket), plus one at the rear (with a bracket). The front and rear motor mount brackets will also have to be removed. To do this, remove the bolts that hold the brackets to the frame; then remove the long bolts that hold the brackets to the engine. Now put some duck tape or rags along the right frame rail (the low frame member) to protect the frame and engine paint as you maneuver the engine out. Tip: Actually, I duck taped some rags to the frame.
Slide the lifting rods through the front and rear motor-mount holes in the engine so that most of the rod sticks out of the left-side. (See Parts and Tools for details on the 3' - 4' rods). Only allow enough to protrude to the right to allow them to be used as handles. See photo above. Now, depending on how many helpers you have, do the following:
Jack-Stand Tip: I found that the rear motor mount hole (the one with the rod in it) was so high that my fully extended jack-stand wouldn’t quite lift the engine high enough to clear the frame. I would recommend you test or measure for this ahead of time. You may need to raise the stand with some boards beneath it, as I did. Easy does it. Since I was working solo, it took me about two hours of jockeying and experimenting, to get the crankcases out. See the photo below.
Splitting the CasesNow that the engine is out of the frame, remove and store the three M8 bolts and three M6 bolts from the right-hand side. Then rest the engine on its right-side. Tip: I used a furniture dolly on which to rest the engine’s right-side. It gave the shafts enough room so the case would lie flat, and let me easily move the whole thing around the garage, as needed. See overhead photo below.
Next, remove and store the 15, M6 bolts from the left side. Tip: Be sure you get the long one that is recessed, near the rear of the engine, in the shift-shaft area, away from the case perimeter. Rotate the transmission's shift-selector drum, as needed, so it lines up with the puzzle-piece shaped hole in the left case. See the service manual for details. Now begin carefully working the case halves apart. There is one place inside that will resist a bit. It is the crossover-tube, in the lower front area of the case. See photo below. The resistance comes from a small O-ring, and is not strong, so just keep working the cases apart. You can use wooden or plastic wedges as you go, but be very careful not to mar the mating (gasket) surfaces.
Once the cases are separated, you'll see that the parts inside are organized into four basic areas. See photo above. From front to rear, and top to bottom, they are:
Emptying the CrankcaseRemove, label, and store the crossover tube. As you do so, check the condition of its two O-rings--replace as needed.
Removing the Crank AssemblyRemove the crank assembly. It must be lifted out squarely, so as to clear its bearing without binding. The assembly weighs over 50 lbs, so be careful of your back, your toes, the crank assembly, and other parts. This takes some strength as well as care and finesse. If the cases will be separated long enough for any dust to settle (a few days or more, under normal conditions), wrap, label, and store the crank assembly.
Pulling the Generator ShaftIf you have disassembled the generator area, you can now pull out the generator shaft and gear. Wrap, label, and store the generator shaft, as you did the crank assembly. See photo below.
Removing the Oil PumpNext, remove the oil pump. To do this, you must take off the oil pump strainer (two brass colored screws on top of the oil pump). This will reveal a bolt hidden underneath. See photo below.
Be very careful of the screen on the strainer. It is a little delicate. See photo above. Then wrap, label, and store the entire pump assembly--with its bolts re-inserted in their places in the pump.
Removing the TransmissionNow for the transmission. Unless you plan on doing some work on it, I'd suggest you pull the entire thing out, as a single unit. Here's how I did this. First I used a few big wire-ties to lasso the pieces together. See photo below.
Next, I tilted the case up, on edge. Then I wiggled the transmission shafts--all five of them--out from the case. The shift-fork shafts can slide out of the forks at any time, so keep everything together by holding the transmission roughly horizontal. Once the transmission is out of the case, be sure to cinch the wire-ties a little more. Then wrap, label, and store the assembly. To see my wrapping job, see the photo shown earlier in this section.
Proceeding to the Next StepTo access related articles, refer back to the Complete Engine Tear Down, Orientation article in this series to see which additional articles best address your situation.
Questions should be asked in our forum (Use discuss link below). The forum is very active and you stand a good chance of getting your questions answered there. If you would like to leave feedback for the author, or have additional information you think will benefit others, please use the comment section at the bottom of this page. Discuss this article on the forums. (0 posts) DISCLAIMER: This information and procedure is provided as a courtesy and is for informational purposes only. Neither the publishers nor the authors accept any responsibility for the accuracy, applicability, or suitability of this procedure. You assume all risks associated with the use of this information. NEITHER THE PUBLISHERs NOR THE AUTHORs SHALL IN ANY EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, PUNITIVE, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OF ANY NATURE ARISING OUT OF OR IN ANY WAY CONNECTED WITH THE USE OR MISUSE OF THIS INFORMATION OR LACK OF INFORMATION. Any type of modification or service work on your motorcycle should always be performed by a professional mechanic. If performed incorrectly, this procedure may endanger the safety of you and others on your motorcycle and possibly invalidate your manufacturer’s warranty. Quote this article on your site | Views: 12261
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