Left-Side Crankcase Leakin' Oil Like A Sieve - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 08-12-2013, 02:41 AM Thread Starter
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Left-Side Crankcase Leakin' Oil Like A Sieve

So, the title pretty much says it all, but allow me to elaborate...

This is not a new leak. I've had Thunder for about two years now, and she's been leaking for at least a year and a half. Since she's been called back into service, it has gotten worse, little by little. We've put in Stop Leak and it didn't even touch it. Thought the crankcase cover may be loose, so Doomsday attempted to tighten the bolts today (cause, yanno, he's stronger n' me and all)...

...and discovered at least one bolt had been stripped previously. The tightening seemed to have just made things worse; she seems to be leaking twice the amount of oil now. I'm thinking it's the gasket, as there has also been little bits of rubber protruding from the crankcase for some time, but I am not confident enough in my mechanical prowess to attempt a repair myself. So, can any of you fellas tell me, what year I need to ask for when I go order this gasket and what size bolt I'll need? Yes, I will order a pair; if one sides' shot, I'm sure they both are. I know a very good mechanic that has worked on two of our Kawis before, and he's close to our place. She'll be in good hands until I learn what I need to and flesh out my toolkit more completely.

Or, if you guys have another suggestion or know what else may be causing this problem, please let me know. I know many of you have been wrenching on these beasties for a long time and I trust your knowledge. Thank you for any insight you can impart!

This is my Vulcan. There are many like it, but this one is mine.



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post #2 of 23 (permalink) Old 08-12-2013, 06:45 AM
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Would that be the side the clutch cover is on? Is it just the clutch cover or is it the whole side? I use this website http://www.kawasakipartshouse.com/oe...2/engine-cover
to get part numbers and then I go to my local kawasaki place to order. But I did use a cereal box with great success on a smaller gasket, and although I am a girl and only been wrenching on this bike, I feel able because of all the help here and the great video that roach did on how to assemble the engine.

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Relocate R/R to side cover
Re-did the engine
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post #3 of 23 (permalink) Old 08-12-2013, 08:01 AM
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Quote:
Originally Posted by BeeSea View Post
Would that be the side the clutch cover is on? Is it just the clutch cover or is it the whole side? I use this website http://www.kawasakipartshouse.com/oe...2/engine-cover
to get part numbers and then I go to my local kawasaki place to order. But I did use a cereal box with great success on a smaller gasket, and although I am a girl and only been wrenching on this bike, I feel able because of all the help here and the great video that roach did on how to assemble the engine.
Madame's leak is on the left side (as you sit on the bike), Stator/Damper Cam Gear side.
The clutch is on the right side.

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
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post #4 of 23 (permalink) Old 08-12-2013, 08:40 AM
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Lol see? Great help.

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1986 750 Vulcan
Coastered
Relocate R/R to side cover
Re-did the engine
from the case up.(And it runs)
YOU CAN TOO!
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post #5 of 23 (permalink) Old 08-12-2013, 11:07 AM
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Quote:
Originally Posted by Madame Mohawk View Post
We've put in Stop Leak and it didn't even touch it.
I never use that stuff (anymore). Sometimes it stops the leak, sometimes it stops up more than the leak. you may have clogged one of the tiny oil lines and in turn increased oil pressure causing the leak to worsen. Used it in my first car radiator, 1973 Maverick (Grabber cause I was cool). had to back blow the heater core cause of that stuff. Easy fix but it I was cold for a few days and had to replaced the radiator anyway. I suggest you blow out the oil lines when it's apart. Also, tightening bolts past the torque spec risks stripping it as well as other problems depending on which bolt it is.
Good luck - hope you get 'er back on the road soon!


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post #6 of 23 (permalink) Old 08-12-2013, 11:17 AM
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Doesn't matter what year you ask for because they are all the same. Most just ask for 2006 because dealerships will hassle you if your bike is more than 10 years old. That being said, for your stripped out bolt I'd suggest putting in a helicoil or re-tapping the next largest size (helicoil is a better fix IMHO because you gain structural integrity).

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post #7 of 23 (permalink) Old 08-12-2013, 11:24 AM
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I believe that the gaskets will be the same for all of the 750's. As far as the bolt? Depends on whether the bolt or the hole was stripped (most likely the hole...aluminum case vs steel bolt). If its the hole, you may be able to get away with packing it with jbweld and re-tapping it. If its the bolt, you can try chasing the threads with a tap and replace the bolt. Stock bolts for the case are 6mm-1.00 (the tap is the same size regardless of which way you have to go). The length will most likely vary, but you can get a replacement at a hardware store, just take the original with you to compare.

Over torqeing the bolts will cause the gaskets to bulge and possibly fail. Try to follow manufacturers recommendations when it goes back together.

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post #8 of 23 (permalink) Old 08-12-2013, 11:36 AM
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Quote:
Originally Posted by Madame Mohawk View Post
... there has also been little bits of rubber protruding from the crankcase for some time,...
Could it be leaking from the outer stator cover? That cover does have a rubber o-ring type gasket. This would mean only three screws to replace that gasket, without pulling the engine off the frame.

Otherwise the rubber must mean someone has re-sealed the inner stator cover and used silicone at some point.

If you get the inner stator cover gasket done, you should also replace the shifter shaft seal, for a few bucks more.

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post #9 of 23 (permalink) Old 08-12-2013, 01:00 PM
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Quote:
Originally Posted by M_Angell View Post
Doesn't matter what year you ask for because they are all the same. Most just ask for 2006 because dealerships will hassle you if your bike is more than 10 years old. That being said, for your stripped out bolt I'd suggest putting in a helicoil or re-tapping the next largest size (helicoil is a better fix IMHO because you gain structural integrity).
x2


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #10 of 23 (permalink) Old 08-12-2013, 01:14 PM Thread Starter
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Haha, waking up to so many answers about this, I feel like a kid at Christmas! At least it sounds like it'll be an easy enough fix...though now I'm feeling that the Stop Leak was a real derp move. Could one hand-tighten the bolts past factory specs? I don't have an impact wrench or anything; it was all done with manual hand tools.

Thank you guys (and gal; Bee, you ROCK! Needs to be more girls riding AND working on bikes, IMO!) for all the answers thus far; gives me a good jumping-off point!

This is my Vulcan. There are many like it, but this one is mine.



Thunderhorse 86 VN-750

Single mirror conversion
Cafe bars
New forks, lowered (Thanks Deuce!)
VN-900 seat (Them hips don't lie!)
Vintage bags
Gas mask 'fairing'
Radiation symbol on tank

On the list
Earshave/rejet
Underglows, light bar
Custom paint
Radiator cover
Pipes
Turn Signals
Grips
Horns
Fixing that damn oil leak
Madame Mohawk is offline  
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