For anyone expecting either a detailed account of how to assemble a Ural engine or a quick throw it together and get it started will be disappointed. This will be more of a log of what I needed to do and any problems I may encounter. The goal is to be careful and deliberate and get it done right. I'm not in that much of a hurry to get it back on the road.
Right off the bat, the first unexpected potential problem. I compared the new cam shaft to the old one and noticed that the new one didn't have an oil pump drive gear. This was not only a surprise to me but also to Mickey. I put the cam in the bench vice with the jaws loosely up against the shoulder of the gear ensuring that the gear was resting flat on the jaw surfaces. Using my new favorite tool the plastic, dead blow hammer, I drove the cam off of the gear. The cam was being replaced and the worst that could happen is the oil pump drive gear will need to be replaced. Note that there is no pin, key or anything besides friction from keeping this gear from spinning on the shaft.
I just tried the trick of putting the cam in the freezer and heat up the gear before dropping it onto the cam shaft. It didn't work. I am thinking that I need to find a machine shop to assemble the cam. The timing gear does have a key to prevent rotation on the camshaft. I need to remember to put in the retaining plate between the bearing and the timing gear.
BTW, I do have a Ural repair manual though it is kind of lacking in such information. And there are a ton of specialized tools that are used for the assembly. And though it does include procedures and specs for things like timing gear backlash, there is no procedure supplied to adjust or change the backlash.
Interesting that it didn't come with that oil pump drive gear...and annoying too.
ReplyDeleteEqually surprising is that there wasn't anything except friction keeping it in place. Lacking a hydraulic press, I dropped it off at a local machine shop along with the bearing. I think that I'll be shopping for a hydraulic press.
DeleteThis is all Greek to me, Richard. Should I ever try what you try to accomplish the bike would likely end up like Humpty-Dumpty.
ReplyDeleteMotorcycle engines feel much more fragile after working on much larger engines. Then again, the larger engines were much more "end user" friendly as long as you could deal with the sheer mass of the pieces. But that makes it feel less fragile. The Ural is a pretty simple engine.
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