coolant leak/issue - Ducati.ms - The Ultimate Ducati Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 20 (permalink) Old Aug 20th, 2019, 4:15 pm Thread Starter
Senior Member
 
t_bare's Avatar
 
Join Date: Sep 2009
Location: Tampa, FL, USA
Posts: 1,237
Garage
Images: 4
coolant leak/issue

I posted this over on the 959forum but they don't get nearly the amount of traffic over there and the knowledge base here has always been exceptional So I'll tell my story here.

MY 2016 959 I bought it this year with 2200miles. In preparation for track use I have thoroughly inspected everything and and prepped it. Occasionally after it has been sitting for a week or so it drops a little coolant. When it is on the kickstand it appears on the left side as if it is coming out of the bleed hole. I have read every thread written in English about this known issue.

Two weeks ago I was looking things over trying to figure out why. I found my reservoir was about 8oz overfilled and was surprised I could make such a stupid mistake and shrugged it off thinking I overfilled it due to the difficulty to read the reservoir level with the light colored Engine Ice. Now the bike has been on my lift for two weeks and it spewed out another small amount of coolant. This time the bike is straight up and down and the coolant ran down the right side of the motor and pooled a tiny bit on the left by the shock mount.

Back in I go looking. What I found was it was leaking at the junction of coolant line to the Vertical cylinder. Just a tiny amount that was pooling up and running down. If the bike was on its kickstand it runs right down to the weep hole and you could think that was the issue because you would see a little pool running out from there, why would look any further up the engine, right?

When I released the suspect clamp I got a substantial pressure equalization I was surprised because the bike had not been run for two weeks. Originally I thought it was under pressure and I cannot really explain that but if it was actually pulling a vacuum and I can make sense of it. I believe it is pulling air at that point which is near the highest point in the coolant system. When the bike gets hot it pushes a little coolant into the reservoir then cools down to pulls air in from the leak. More air in the system the more it heats and expands. Best I can figure I have got a poor clamp install and or a bad radiator cap. Oh yea, my radiator was about 8oz low, so it is pushing coolant out without drawing back in. Parts are ordered. The leaking junction is visible if you remove the right side fairing and the coil pack in case someone else has these symptoms. Photos below


Thoughts?
t_bare
Attached Thumbnails
Click image for larger version

Name:	IMG_6727.jpeg
Views:	29
Size:	2.25 MB
ID:	951433   Click image for larger version

Name:	IMG_6728.jpeg
Views:	29
Size:	2.22 MB
ID:	951435   Click image for larger version

Name:	IMG_6729.jpeg
Views:	25
Size:	2.28 MB
ID:	951439  

1 Ducati = Ducatista
2 Ducatis = Mechanic

2013 Multistrada GT Touring Grey
2008 Ducati Hypermotard 1100s
2002 Ducati 998 Faster Banana!!!
2000 KTM 300 EXC
t_bare is online now  
Sponsored Links
Advertisement
 
post #2 of 20 (permalink) Old Aug 20th, 2019, 5:27 pm
Senior Member
 
Buhgaboo's Avatar
 
Join Date: Jul 2014
Location: Greenville, SC, USA
Posts: 290
Sounds like a stuck thermostat...not much to a coolant system to fail...cap is functioning or the reservoir would not overfill...but if the thermostat is stuck shut it traps the vacuum in the engine as you have experienced...that's my assumption...just excited to be part of the knowledge base...lol

Sent from my Pixel XL using Tapatalk
t_bare likes this.
Buhgaboo is offline  
post #3 of 20 (permalink) Old Aug 20th, 2019, 6:36 pm
Come in Spinner :)
 
davy.j's Avatar
 
Join Date: Oct 2009
Posts: 7,171
Images: 146
Thermostats have a bypass or are designed to not completely shut of the system so I'd discount that theory.
xracer likes this.

2000 853
2007 Cagiva Mito.
1980 and 1978 Ultra lightweight Yamaha SR500 Cafe Racers
1967 500cc Ultra lightweight Triumph Daytona Cafe Racer
davy.j is offline  
 
post #4 of 20 (permalink) Old Aug 20th, 2019, 6:42 pm
Senior Member
 
Buhgaboo's Avatar
 
Join Date: Jul 2014
Location: Greenville, SC, USA
Posts: 290
Quote:
Originally Posted by davy.j View Post
Thermostats have a bypass or are designed to not completely shut of the system so I'd discount that theory.
Only think left would be a blocked water pump?

Sent from my Pixel XL using Tapatalk
Buhgaboo is offline  
post #5 of 20 (permalink) Old Aug 20th, 2019, 6:48 pm
Come in Spinner :)
 
davy.j's Avatar
 
Join Date: Oct 2009
Posts: 7,171
Images: 146
Quote:
Originally Posted by Buhgaboo View Post
Only think left would be a blocked water pump?

Sent from my Pixel XL using Tapatalk



Never happen.

2000 853
2007 Cagiva Mito.
1980 and 1978 Ultra lightweight Yamaha SR500 Cafe Racers
1967 500cc Ultra lightweight Triumph Daytona Cafe Racer
davy.j is offline  
post #6 of 20 (permalink) Old Aug 20th, 2019, 6:49 pm
Senior Member
 
Buhgaboo's Avatar
 
Join Date: Jul 2014
Location: Greenville, SC, USA
Posts: 290
Quote:
Originally Posted by davy.j View Post
Never happen.
Blocked hose...final answer ..lol....there isn't much there...I'm still saying thermostat...in a car it can cause leaks

Sent from my Pixel XL using Tapatalk
Buhgaboo is offline  
post #7 of 20 (permalink) Old Aug 20th, 2019, 6:50 pm
Come in Spinner :)
 
davy.j's Avatar
 
Join Date: Oct 2009
Posts: 7,171
Images: 146
Ever seen inside a Ducati thermostat?
All cars have a thermostat bypass or even a small hole in the thermostat base plate.

2000 853
2007 Cagiva Mito.
1980 and 1978 Ultra lightweight Yamaha SR500 Cafe Racers
1967 500cc Ultra lightweight Triumph Daytona Cafe Racer
davy.j is offline  
post #8 of 20 (permalink) Old Aug 20th, 2019, 7:05 pm
Senior Member
 
Buhgaboo's Avatar
 
Join Date: Jul 2014
Location: Greenville, SC, USA
Posts: 290
Quote:
Originally Posted by davy.j View Post
Ever seen inside a Ducati thermostat?
All cars have a thermostat bypass or even a small hole in the thermostat base plate.
I admit it doesn't make complete sense but it is still possible...a Google query of a stuck thermostat yields a supporting answer...bottom line...fluid gets out...but like a check valve doesn't get back in....there are very few scenarios that permit that outside of the cap and thermostat

Sent from my Pixel XL using Tapatalk
Buhgaboo is offline  
post #9 of 20 (permalink) Old Aug 20th, 2019, 8:23 pm Thread Starter
Senior Member
 
t_bare's Avatar
 
Join Date: Sep 2009
Location: Tampa, FL, USA
Posts: 1,237
Garage
Images: 4
davy.j, do you think I got it right? Vacuum side of radiator cap not allowing coolant to return and the poor seal at vert cyclinder allowing coolant to leak out a little as it is sucking air? As bike heats up the increasing sized air bubble continues to push coolant into reservoir faster each heat cycle is what I am thinking.

This bike is beautiful but is a pain in the ass to work on.

Thanks,
t_bare

1 Ducati = Ducatista
2 Ducatis = Mechanic

2013 Multistrada GT Touring Grey
2008 Ducati Hypermotard 1100s
2002 Ducati 998 Faster Banana!!!
2000 KTM 300 EXC
t_bare is online now  
post #10 of 20 (permalink) Old Aug 20th, 2019, 9:05 pm
Come in Spinner :)
 
davy.j's Avatar
 
Join Date: Oct 2009
Posts: 7,171
Images: 146
Fix the leaks, bleed the system and see what happens then.

2000 853
2007 Cagiva Mito.
1980 and 1978 Ultra lightweight Yamaha SR500 Cafe Racers
1967 500cc Ultra lightweight Triumph Daytona Cafe Racer
davy.j is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ducati.ms - The Ultimate Ducati Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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

Password:


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

Email Address:
OR

Log-in










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