How far to go

I’ve got a 1973 Eldorado last year and I’ve just got around to starting a mechanical overhaul. I’ve stripped the engine and am waiting parts to rebuild. The speedo says 30000 miles and the state of the engine could bare this out. I did briefly start the bike and ran it up and down the road, it shifted ok through the gears but apart from that I’ve no idea of the history. So I’m now thinking about the gearbox, how far do I go into the gearbox to assess its condition?
Your thoughts appreciated.
Cheers Ian.

Certainly with the later models, it’s generally advisable to change the return spring whilst you have the gear box out. It’s only just under the end cover and if you are careful, you don’t need to disturb the cluster.
Something in the back of my mind makes me think the loop frame models may well be different. Worth having a read of Guzziology if you can get hold of a copy.

Recalling a conversation with Dave P…I think you can get at the return spring on a loop…
Beluga…is it the chrome bores thing ?

If a 5 speed bike, then gearbox (and access to spring etc) is same as all the other big block guzzis which came after? Mine certainly is. Does mean parts are available.

I get my gearboxes refurbed by NBS, on the basis that he has spares to hand (or, in some cases, less knackered/refurbished components). Did my S3 and Cheryl’s T3Cali in recent years - great job. He now has my T3Cali…with it’s dechroming bores…(only went in for a valve and guide job…ho-hum!)

Thankyou for all your input it is the 5 speed box and it is the chrome bores thing Kate but that to be honest was expected, I’m haveing Nigel regrind crank which I should be picking up end of this week, I suppose I’m just wondering how brave I’m feeling, as I guess I could either drop the box off to him at the same time or go into it myself . I’ve only ever taken a boat gearbox apart and that was simple. I’m not quite sure how difficult or realistic it will be to go into the gear box and then assess the condition. I guess unless I do it I’ll never know! Thanks Don I do have Guzziology, and Chiltons but also don’t have any “special tools” but so far I’ve got by without but I suspect this might not last. Is going in to the gearbox that difficult?
Thanks for looking. Cheers Ian

tis funny…this chrome bores thing… I tend to ignore it mostly…but I do 1000 mile oil changes and inspect the mesh regularly , Guys a bit ocd about it…but the Beetle, which had been left open in Colorado…started, ran and used no oil…with a pit in his nearside bore of about 5ml diameter and 1 to 2 ml deep. We reckoned this is where the piston had stopped and as the bike had no mainstand…thus was at its lowest point when abandoned…even so Wainy just had to have brand new barrels and pistons…which he got from a mate for a couple hundred quid…lucky lad…
4 speed loop gearboxes Guy says are tricky…am not sure about 5 speeders…

It is a pain this chrome bore issue, one of the bores on the Eldorado had worn through at the top (near side funnily enough) and the piston had some quite severe scoring. The cam followers were also pitted along with the big end being a little bit ridged, not to bad really, at least the front and rear mains were good (now they are really expensive!) I got the nikisal barrel piston set which although a bit of hit is not that bad value considering what you get. When I was at NBS I saw the Cali with the dechroming bores a real pain but at least the T3 has an oil filter.

Omigod he touched my baby!!!

I stripped and rebuilt my Spada 5 speed box a few years ago. I managed without any specialist tools, apart from one deep socket for the nut on the output shaft.
It’s not to bad a job so long as you take your time and work carefully, keeping everything in order.
I changed the return spring and shimmed the box, not that it made a lot of difference, some gear changes are still like dropping a brick in a bucket!

Padgman, yes that’s how it was, but I was gentle! I’ve just read the Peter Roper article suggested to me on the Loopframe forum, a brilliant piece of writing which has inspired me so I’m going in, in the morning, watch this space! Thanks Don encouraging words.
Cheers Ian.

The Pete Roper article is very good, that is mainly what I followed when rebuilding mine.
This what you find inside

…and I never knew that Nivea made gear oil!!! :laughing:

Thanks Don, I hoping to get the peg nut socket in the post today so I can remove the clutch hub. I’m going to make a tool to hold the clutch hub from an old clutch plate so I’ve just got to work out a safe way to remove the lay shaft lock nut with minimal tool making!
Cheers Ian

I’ve just got the layshaft lock nut off and made my clutch boss tool, all relatively painless. I’ve also visually checked through the filler hole and it looks like it is shimmed up ok, it really shifts good on the bench. I guess I still need to replace the seals, return spring and check the bearings, so just awaiting the postman before further progress.
Cheers Ian

It is the selector drum that usually needs shimming. Once you have it all apart, put the drum back in the box and refit the end cover (with gasket). Tighten up the end cover and see how much the drum moves back and forth. Mine certainly was quite loose.
I did the same thing on my little Stornello and needed new shims for the end. They turned out to be the same part as the Spada

Thanks Don still waiting on the peg nut socket, I’m hoping to be able to get the box apart on Tuesday. I’ll report back when I’ve made progress.
Cheers Ian

Well thought I’d better give an update as I eventually managed to get the peg nut socket. Taking the box apart was really straight forward. The box seems to be in good condition all bearings sound, all dogs, gears and forks good. So I’m replacing oil seals, return spring and o rings the two on the input shaft were rock hard and cracked when removed. I checked the play on the selector drum as Mr Roper suggests and found some! So I’ve also ordered shims. I carefully removed the speedo drive, making sure I kept an eye out for the special hardened washer that is “impossible to buy on it’s own” unfortunately somebody had already worked that out as it wasn’t there. Fortunately Gutsibits found me a second hand one, thanks Ed. So I now just await parts and we’ll see if I can get it back together. I’ll update on progress.
Cheers Ian