93 Daytona oil leak

[Cliff22553]

Greetings from Virginia,
Daytona rear main crankshaft seal oil leak when purchased, finally replaced seal but leak persisted. Replaced again with different (narrower single lip to facilitate bearing drainage) seal. Still leaks! Crankshaft not grooved, or out of round. Suspect brg/seal housing not aligned or crank needs to be turned anyway.
9500 miles on bike, third owner. Thanks for any suggestions.
Cliff22553

[pete roper]

Are you sure it's the seal? Are you sure it is engine oil? Gear oil can leak up the clutch pushrod from the thrust assembley at the back of the gearbox. Make sure you replace the pushrod seals. You can smell if its gear oil.

Also the bottom two bolts of the rear main bearing housing go into holes that aren't 'Blind' and go all the way through to the inside of the crankcase. They sometimes leak. Seal with teflon tape and loctite 243.

Remove the flange and replace the flange gasket. Special tool required or you'll break the flange.

Finally the seal should only be installed flush with the outer edge of the bearing flange, not pushed all the way in until it uses the bearing itself as a register. If you do that it will immediately blow on start-up.

Do NOT fill to the upper mark on the dipstick. The correct way to judge the level of the oil is with the stick SCREWED IN and the bike UPRIGHT. In this position the oil should be half way between the 'Full' and 'Add' marks on the stick.

Make sure that the breather system to the frame is clear and working properly and that the frme is vented to the airbox or atmosphere or the case will pressurise.

Pete

[SF2DieHard]

did I say :worship::worship::worship: lately???
Pete, You Da Man.

DungeonMaster

[abouc]

did I say :worship::worship::worship: lately???
Pete, You Da Man.

DungeonMaster

:plus:

[zjdmm1]

:plus:

[pete roper]

Jeez. If youse blokes ever meet me you'll be terribly disappointed. I'm terrifically boring and mediocre. I just happen to have over thirty years experience of working on poxy Moto Guzzis.

Also after May the 5th I won't even technically be a 'Man' any more as I won't have a testicle! I lost one in a bike accident in '73 and now they're cutting the other one off:crybaby: So I can't be 'Da Man'. I'll have to be 'Da Eunuch' :D

Pete

[Cliff22553]

Pete, thanks for feedback. All items you suggested covered during recent re-assembly, may try to run engine with trans removed. Not looking good.

[pete roper]

Bloody difficult to do. How will you start it? You are using a Corteco Viton crank seal aren't you? How did you install it? They do have a tendency to hang up on the back of the crank and rip. My method is usually to remove the flange and then get the seal out. Clean up the gasket surface on both the flange and the case making sure not to loose the oil feed dowel which also locates the bearing within the flange. Then press the new seal in the flange while its out. Install a new gasket on the flange, (With a thin smear of Threebond 1211 if you're a bit paranoid.) coat the rear main bearing journal and end of the crank liberally with moly based assembley lube and then use LONG bolts through a couple of the flange yes into the case to line the flange up, (It only fits in one position with the oil dowel upward to feed oil to the rear idler shaft bearing in the case.). I then use a dead-blow hammer to gently knock the flange home. When the seal approaches the end of the crank you can then use nuts and washers on the long bolts to pull the flange down into the case. Obviously only 1/2 a turn or so at a time on eacb nut as you are effectively 'rocking' it in and there is only a thou and a bit clearance to rock! This allows you to keep a beady eye on the seal lip as it approaches the end of the crank and you can use your finger to ease the lip over he end of the crank if it looks like its hanging up. Once the lip is over you can continue to pull the flange home with the nuts until you can install the eight retainer bolts and washers and pull it home witha crosshatch patern 1/2 a turn at a time. Once seated torque 'em all down to the specified torque, (20ft/lbs?) with the bottom two bolts sealed with tape.

As long as the breather system is working and the crank sealing surface is un-marked it *should* be fine. Using a Nitrile seal won't work. The rear crank seal has to be a flurocarbon or prefferably a Viton seal. the newer Guzzi seals are manufatured by Corteco and are directional as well.

Pete

[zjdmm1]

Jeez. If youse blokes ever meet me you'll be terribly disappointed. I'm terrifically boring and mediocre. I just happen to have over thirty years experience of working on poxy Moto Guzzis.

Also after May the 5th I won't even technically be a 'Man' any more as I won't have a testicle! I lost one in a bike accident in '73 and now they're cutting the other one off:crybaby: So I can't be 'Da Man'. I'll have to be 'Da Eunuch' :D

Pete

Pete...
You "Da Man" today,
you will be tomorrow,
you will be on May 6th,
and you will continue to be "Da Man"
er..um...that is... unless... (god forbid) you make a conscious decision to become a sniveling, incompetent, pussy who hates motorcycles and decide to reinvent your life by taking up "mime" on the streets of paris in black spandex tights.

:cathat:

[pete roper]

As long as I don't end up looking like Donatella Versace I reckon I'll be right:eek:

http://makeupbeat.com/blog/wp-content/uploads/2008/05/donatella-versace-plastic-s.jpg

Don't reckon I'll carry a frock too well but high heels might suit me! :D.

Pete

[abouc]

She looks like Janice from the Muppets.

[pete roper]

She looks like Janice from the Muppets.

Botox is a terrible thing! Just imagine how much better it would of ended up if she'd just started drinking beer!

http://fizzingbanana.com/wp-content/uploads/2009/04/beer-helping-ugly-people.jpg

Worked for me!

Pete

[teacherboy]

Jezus Dude, I just threw up on my keyboard. Now that is seriously frightening. Nuts or not you're still the Guzzi Man. You're a living service manual. :plus:
As long as I don't end up looking like Donatella Versace I reckon I'll be right:eek:

http://makeupbeat.com/blog/wp-content/uploads/2008/05/donatella-versace-plastic-s.jpg

Don't reckon I'll carry a frock too well but high heels might suit me! :D.

Pete

[SF2DieHard]

I'm choosing the beer instead of the botox.

[SF2DieHard]

Jeez. If youse blokes ever meet me you'll be terribly disappointed. I'm terrifically boring and mediocre. I just happen to have over thirty years experience of working on poxy Moto Guzzis.

Also after May the 5th I won't even technically be a 'Man' any more as I won't have a testicle! I lost one in a bike accident in '73 and now they're cutting the other one off:crybaby: So I can't be 'Da Man'. I'll have to be 'Da Eunuch' :D

Pete

Your humility proves my point Pete. :)
I greatly appreciate all your good points.

DungeonMaster

[Bill in OKC]

Pete...
You "Da Man" today,
you will be tomorrow,
you will be on May 6th,
and you will continue to be "Da Man"


:plus:

Amazing Guzzi knowledge

:worship: