Oil Leak Issue - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 04-21-2010, 02:50 PM Thread Starter
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Oil Leak Issue

Hey All, I just recently bought an 89 Vulcan 750. I really know nothing about auto mechanics, but I'm learning.

My issue is I have a pretty big oil leak-I believe it is coming from the rear portion of the bottom of the bike (like toward the rear of the crank case and near the coolant reservoir; at least that is where the majority of the oil seems to be). I think it might be a leak in a gasket in the engine cover. It did give me some white smoke one time-but hasn't done it in a few starts since (so I guess it could be the head gasket, but I'm hoping it isn't). Any insight? Ideas where to start?

Thanks!

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post #2 of 10 (permalink) Old 04-21-2010, 03:11 PM
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Clean off all the oil and watch it closely to see if you can pinpoint just where it's leaking.

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post #3 of 10 (permalink) Old 04-21-2010, 05:22 PM
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One thing comes to mind. Behind the coolant bottle on the back of that cyl jug is where the automatic cam chain tensioner is located. If it is loose, or if it has been replaced with a manual cct and not done right, you'll get quite a bit of oil dribbling out of there. ACCT's and MCCT's look completely different.

Manuals look like a bolt head with a locking nut on it, protruding from the engine case.

The ACCT's look like an enclosed device with a small 6mm screw on the very top.

Just something to check out.

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post #4 of 10 (permalink) Old 04-24-2010, 01:57 AM Thread Starter
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Fergy, Thanks for the advice. There's a good chance that the cam chain tensioner is where the oil is coming from. I'm replacing the o ring located inside of the foremost bolt and I'm going to make sure both side bolts are tight. Any other advice?

It seems like that is the best guess other than the possibility of the engine side cover gasket needing a replacement. Thanks for the direction. I'll let you know how it turns out.
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post #5 of 10 (permalink) Old 04-24-2010, 07:30 PM Thread Starter
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Well it wasn't the cam chain tensioner o ring. After replacing it, I cleaned the bottom of the crankcase and the entire bike, then ran it for about 17 miles. I found that the leak is really streaming from the bottom side engine cover bolt closest to the coolant reservoir. It makes sense bc my tire was getting large amounts of oil on it and with the leak in that location, it would slide down the center stand right to my rear tire.

With that said, any pointers on replacing the gasket between the side cover and the crankcase?

Thanks!
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post #6 of 10 (permalink) Old 04-24-2010, 11:55 PM
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Quote:
Originally Posted by New Vulcan Rider View Post
Well it wasn't the cam chain tensioner o ring. After replacing it, I cleaned the bottom of the crankcase and the entire bike, then ran it for about 17 miles. I found that the leak is really streaming from the bottom side engine cover bolt closest to the coolant reservoir. It makes sense bc my tire was getting large amounts of oil on it and with the leak in that location, it would slide down the center stand right to my rear tire.

With that said, any pointers on replacing the gasket between the side cover and the crankcase?

Thanks!
Remove the spark plug wells and replace the O-RINGS!!! The right rear and left front have deep spark plug caps they go inside the "plug well" When the O-ring goes bad you will get oil comming out of the drain hole.

Insert a large hex nut to fit in the recessed hex on the plug well and remove w/cressent wrench. If you have an ACE Hardware near you match them up with new ones, if not order from KAW.


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post #7 of 10 (permalink) Old 04-20-2017, 07:36 PM
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I cant figure out what is wrong/where thisnl oil leak is coming from. This gasket or prt also popped off any ideas?
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post #8 of 10 (permalink) Old 04-21-2017, 10:17 AM
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Quote:
Originally Posted by Heather Dorrian View Post
I cant figure out what is wrong/where thisnl oil leak is coming from. This gasket or prt also popped off any ideas?
Dang, that looks like a lot of oil.
It certainly isn't a good thing if its getting on your tire.
Not sure how much of your own work you do but you might look around to see if there a good bike mechanic nearby.
I do as much as I can myself but for some things, I just take it to the shop.

BTW, welcome to the forum.

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post #9 of 10 (permalink) Old 04-21-2017, 10:30 AM
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Quote:
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I cant figure out what is wrong/where thisnl oil leak is coming from. This gasket or prt also popped off any ideas?
The missing part is the cap off the bevel gear case and the oil is pouring from there.

Here's a pic of what the cap looks like, saw a new cap on ebay last week, but it's gone now. Just posting this for the picture: 1993 Kawasaki Vulcan VN750 VN 750 differential gear case engine motor | eBay
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post #10 of 10 (permalink) Old 04-21-2017, 12:02 PM
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You can get a whole used bevel gear for sub $45. It can be installed very easily without moving the engine or anything.

May be worth buying a used bevel gear and a new gasket.

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