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Discussion in 'Battle Scooters' started by GotMojo, May 21, 2019.
Think I would go the stock stuff, just my .2c worth.
No guts, no glory. You're in this deep already, go for the gusto! If it works, it'll be awesome. If it doesn't, you're out some money, time, but learned some Valuable lessons.
I like the way you talk.
Here we go!
Cases mated @10 Nm. Lots of assembly lube.
Crank spins smoothly. Good sign.
Quick trip to China-supply to get a pis-poor quality chain wrench. It's apparently made from those mystery metals in the periodic table.
Bendsifyoulookatwrong-tium, I believe.
Held off long enough to get it up to torque. Robot says 90ft-lbs.
New oil pump, chains, sprockets etc all back in.
The surgery table.
I have to get the dough ready for Pizza tonight so this is as far as we get for now. I'll put the top end together later this week and head over to Massimo's to install the main oil seal. It requires a special tool and I don't want to fook with it. Already have too many one-off tools.
Nice tidy workbench - at least compared to mine. This is going to work, because you deserve it.
I don’t think the case bearing in the first photo looks that bad. Measuring the inside diameter would help determine if it was truly still ok, but I’m pretty sure it is.
As you mentioned, engine #2 is much worse. The scoring is significant. But I wouldn’t throw it away. I’m sure those bearing shells are used in another application and could be sourced. A machinist could install and do some minor work to make sure the bores are aligned.
Those were the two halves from engine #1. The scoring and wear was much worse on that one.
I see. I know you are well past bare cases at this point, and being a relatively low stress engine you’ll probably be ok. If it wasn’t ok, a likely symptom would be low oil pressure at idle.
Bearings were sounding like old rollerblades.
So out they came.
Did they need to come out?
Probably not. I did it for SCIENCE.
I've never removed a blind bearing before so it was a good learning opportunity. Besides, doing so meant a shiny new set of disposa-tools!
Quality was as expected and I needed to do a little work on the grinder to get it to work but once that was done they all came out easy-peasy.
Where did you buy that kit?
There's many to choose from. They're all the same apart from the case.
A couple of months ago I discovered that O'Reilly had tool sets they will lend to you. What they do is take a deposit on the tool using a credit card but if you return it in a day or 2 they don't run the credit card charge. Whether they have the right tool for what you are doing, I don't know. I used it to get a very large odd sized socket that I really didn't want to own.
The post about the mains piqued my interest. Watched robot's videos, and did some other searching about the bearings. What kind of engineering level of hell produces engines where you cannot replace main bearings? Unbelievable. Makes me think twice about modern Piaggio products........
I am confident they can be replaced, even if Piaggio doesn’t offer the part. I’d be willing to bet if they were carefully pressed out of the case there is some kind of identification on them from the manufacturer that could be used to source them. It is not likely that Piaggio made the bearings.
look like a set of rod bearings for an automotive engine.
I was thinking the same thing about the rod bearings. Catch is finding the right size if you can't find any numbers or anything. I have often wondered why inserts aren't used on many bikes where, especially cams, run in non-repairable cast aluminum heads.
Wouldn’t take much to measure the OD of the case and the OD of the crank and come up with something. Width would be half ass irrelevant as you could always make a brass thrust bushing to take up any issue.
Who do I send the cases to?
I sure wouldn’t pitch the cases you aren’t using.
I assume there is an oil feed hole in the bearing half that is grooved?
In replacing the bearings, the concerns would be trueness, depth, thickness, width, and an oil feed hole that lives up.
I’d actually have you send the cases to me and try to figure it out for you if I wasn’t so close to snowbirding to Florida for the winter.
Yeah, I agree with all that - I'm sure something can be done to replace the bearings. I suppose that by the time bearings are sourced, cases line bored, new bearings installed, and shims worked out - and the machine time........maybe just easier to get the new cases?