Coolant Leak - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
engine or exhaust, discuss it here!

LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 05-24-2007, 11:01 PM Thread Starter
Join Date: Mar 2007
Location: Lompoc, CA
Posts: 42
iTrader: (0)
Coolant Leak

96 VN750 with 22+K miles
Got to work this morning and realized I had a coolant leak. I traced it to the right side bottom of the engine, there seems to be a hole where the coolant is dripping from.
Is this a weep hole or what?
After looking in “Clymer” (page 351 – 352, figure 18), the best I can make out it looks like there is a hole out the bottom just behind the mechanical seal (A). Would damage to this seal or just time allow coolant to get past this seal?
I guess what I really want to know is does anyone know if coolant from this area means I need to replace the mechanical seal or do I need to keep looking?

Thanks all,
BVP is offline  
Sponsored Links
post #2 of 5 (permalink) Old 05-25-2007, 11:18 AM
Members who have donated towards server costs
fergy's Avatar
Join Date: Mar 2006
Location: Kyle, Texas
Posts: 4,054
iTrader: (3)
There is a coolant drain screw on the right bottom of the engine, with a 10mm head on it. If that is close to where the drip is coming from, maybe it's gasket or washer is flattened and or the screw is loose, or worse, missing? I wouldn't think if it was missing you'd have any coolant left??

Kyle, TX member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart

fergy is offline  
post #3 of 5 (permalink) Old 05-25-2007, 01:07 PM
Join Date: Mar 2007
Posts: 27
iTrader: (0)
Hey BVP. I had the same issue. Yes, I believe that this is due to the mechanical seal. I had a pretty stout leak coming from that hole one evening. So, I undid the coolant drain bolt that's right next to the hole and tightened it back up. The leak was gone. I saw it as a potential problem with the mechanical seal and I am planning on replacing it at the end of the season.

I am new to motorcycle engines but not wrenching. If you find the problem to be caused by something else I would love to hear about your experience. This is just my problem solving with this issue.
wheeler is offline  
post #4 of 5 (permalink) Old 05-25-2007, 08:12 PM Thread Starter
Join Date: Mar 2007
Location: Lompoc, CA
Posts: 42
iTrader: (0)
Didn't ride today because of the leak yesterday. Left the bike up on the center stand to help ID where the leak was coming from. Well, no good, no leakage signs anywhere under the bike this morning. So I thought maybe I did not have any coolant left in the bike (this sent a chill up my spine). Took off the cap and the system is full. I now do not have a clue, is it just the first signs of a problem, a one time occurance or may be gremlins. I plain on riding the next couple of day with a water bottle handy just in case and watching it closely. I hate mistery leaks!

BVP is offline  
post #5 of 5 (permalink) Old 05-25-2007, 08:30 PM
Members who have donated towards server costs
93VN750's Avatar
Join Date: May 2006
Location: Tampa, Florida
Posts: 1,766
iTrader: (2)
Send a message via Skype™ to 93VN750
Originally Posted by BVP View Post
I hate mistery leaks!

Even worse, my problem, mystery consumption.


93VN750, under re-construction Member # 828

Rick's Stator and R/R
MF AGM Battery
Shaved & Jetted
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
93VN750 is offline  
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome