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850T oil leak from cutout between engine and transmission

S

sanderoudev

Just got it firing!
Joined
Jan 29, 2022
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Hi,

I just introduced myself in the introduction subforum.
My name is Sander and i'm from the Netherlands.
I own a 850T from 1974 which i'm currently rebuilding.
The engine and transmisssion i did not take apart, because the previous owner did rebuild them. (proof on paper)
The last year the engine didn't turn over but last week there was quite a puddle of clean oil underneath the bike.
It seems to be coming from the cutout between the engine and tranmission, the slot that is i guess for letting oil out when there is a leak.

Next week i'm going to split the engine and tranmission to inspect and replace all neccesary parts.
I'm going to crab the frame, but i have a couple of questions;
1. What tools do i need to remove the flywheel, clutch and seals/bearings.
2. While i'm in there, what parts should i replace as a precaution?
3. Are there any tips / tricks involved ?

Regards,
Sander
 
You will at a minimum need an alignment tool for the clutch plates. It would help to have the factory flywheel holding tool as well. If you still have the old style clutch hub and plates I'd recommend going to the updated hub gear and clutch plates. For that you will need the holder tool for the hub gear and a special socket to remove the gland nut. If you go that far, do the front gearbox seal and o-rings. Check the banjo bolt near the bottom of the crankcase for leaking. There should be some folks near you that have those tools. You can't get to it unless you remove the flywheel. I wish you well on this.
 
john zibell said:
You will at a minimum need an alignment tool for the clutch plates. It would help to have the factory flywheel holding tool as well. If you still have the old style clutch hub and plates I'd recommend going to the updated hub gear and clutch plates. For that you will need the holder tool for the hub gear and a special socket to remove the gland nut. If you go that far, do the front gearbox seal and o-rings. Check the banjo bolt near the bottom of the crankcase for leaking. There should be some folks near you that have those tools. You can't get to it unless you remove the flywheel. I wish you well on this.
Click to expand...
Thanks for the reply.
What exactly is the reason for upgrading to the 'updated gear and clutch plates'?
 
sanderoudev said:
Thanks for the reply.
What exactly is the reason for upgrading to the 'updated gear and clutch plates'?
Click to expand...
The old style on that bike will fail at about 40K miles. The hub gear wears and the clutch won't easily disengage. That is the clutch plates hang on the hub gear and won't separate so when you squeeze in the clutch lever, power still goes to the rear wheel.
 
After 2,5 hours the box is out.
1000029707.webp

It's leaking from the pushrod and the clutch plates are contaminated. Next job is to replace the seals and to remove the flywheel and also replace those seals.

1000029706.webp
1000029708.webp
1000029710.webp
The starter gear looks rather nasty though. Should I replace it?

1000029709.webp

Also one more question.
The seal in the output side was leaking aswell.
So oil is inside the swingarm.
If I clean that up should it then be ok?
Or does the bearing need replacement in the swingarm?

Regards
 
You will need to take off nut on output shaft & change seal. Get brown ones they seal better than blue ones.
There is a speedo metal ball in a slot after nut comes back, make sure you catch it w/magnet.
That starter ring gear looks OK to me.
If you take off the imput hub on trans you can use it to alien the plates on assembly. There is also a seal & orings there too.
Nice work!!
I had a guy time me one time on a bet. I pulled apart in 45min to rear seal. That was on one like your T or a G5. I usually take longer.
 
Last edited:
There are two rubber cones that go on the clutch push rod. You can push the push rod and come out the rear of the gearbox. You can find the part numbers in the downloads with an account upgrade. see https://www.guzzitech.com/forums/threads/user-account-upgrade-donations.14025/ Also since it is an 850T I would make sure the shift return spring has been updated as the old style spring originally installed does break and fail. That may be a job for a Guzzi shop as going into the gearbox is not for the faint of heart. Some of the replacement spring now also have issues. see https://www.guzzitech.com/forums/threads/beware-of-the-new-shift-return-springs-for-5-speed.27005/
 
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