Test using Compressor - Interesting - MG-Rover.org Forums
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 11 (permalink) Old 18-03-2016, 17:40 Thread Starter
Registered User
 
Join Date: Feb 2011
Car: Rover 45
Posts: 211
Test using Compressor - Interesting

I just did something you might find interesting to tell the difference between IMG and HGF.


I disconnected the return line from the radiator to the expansion bottle, at the bottle end, and plugged it with a pressure gauge.


I then connected an air compressor to the expansion bottle where the return line would normally go.


Therefore this is like a pressure test of both the system and the cap, since the cap regulates pressure.


I found that the system went to 1.2 bar, and then slowly bleeds back to 0.8 bar, and eventually to zero bar.


However, the oil level on the dipstick goes up.


Meanwhile, doing this over and over so that 1 liter of coolant is lost does not produce anything in the cylinder when cranking without plugs.


Therefore, I know that my initial plan to replace the IMG Inlet Manfold Gasket will not actually solve problem,
it is a HGF between oil and water passages not involving the cylinder, as all compression check at 140 psi-ish.


Does anyone thing this conclusion is not valid, if so please let me know.


Also, when it comes to cleaning the system out, pumping in air in this fashion is a good way to forcible eject all the crap out the top of the rad.
Bunsen Honeydew is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 18-03-2016, 17:53 Thread Starter
Registered User
 
Join Date: Feb 2011
Car: Rover 45
Posts: 211
P.S: >> What would happen if I drove it with the cap loose, so as to not let it pressurize?
Bunsen Honeydew is offline  
post #3 of 11 (permalink) Old 18-03-2016, 19:45
Registered User
 
Join Date: May 2008
Location: Scunthorpe
Car: Rover 400 (95-99)
Posts: 1,557
the water will boil and get loads of air in it , pressuring the system allows it to get to higher temps and not boil thus causing no air in the system
Andy400 is offline  
 
post #4 of 11 (permalink) Old 19-03-2016, 01:12
Registered User
 
Join Date: Oct 2008
Car: Rover 400 (95-99)
Posts: 3,038
Your logic appears sound to me.

All I would add is that this diagnosis gives you the option to use a sealant with a reasonable level of confidence. I'm aware this is heresy, but BARS LEAKS has worked for me in the past.
jdhturner is offline  
post #5 of 11 (permalink) Old 19-03-2016, 09:00
Registered User
 
Join Date: Apr 2004
Car: MGZS180,MGZR160,MGF VVC,MG Maestro T16, Rover 111
Posts: 5,787
I'd be worried about inducing HGF pumping it with compressed air.
Talkingcars is offline  
post #6 of 11 (permalink) Old 19-03-2016, 11:20 Thread Starter
Registered User
 
Join Date: Feb 2011
Car: Rover 45
Posts: 211
Quote:
Originally Posted by Talkingcars View Post
I'd be worried about inducing HGF pumping it with compressed air.
The pressure supply is mild, and pressure never goes above expansion gap maximum pressure. Pressure is applied at expansion bottle. The effect is the same as a conventional pressure test.
Bunsen Honeydew is offline  
post #7 of 11 (permalink) Old 19-03-2016, 11:42 Thread Starter
Registered User
 
Join Date: Feb 2011
Car: Rover 45
Posts: 211
Quote:
Originally Posted by jdhturner View Post
Your logic appears sound to me.

All I would add is that this diagnosis gives you the option to use a sealant with a reasonable level of confidence. I'm aware this is heresy, but BARS LEAKS has worked for me in the past.


You know, I went through all the Bars Leaks products on their website, but only one seems to mention coolant-to-oil leaks specifically:


Cooling System Treatment | Coolant Seal


Anyone got any idea where I could get this?
Although the car is in Ireland, I work in Canary Warf in London 4 days a week.
Bunsen Honeydew is offline  
post #8 of 11 (permalink) Old 19-03-2016, 17:04
Registered User
 
Join Date: Oct 2008
Car: Rover 400 (95-99)
Posts: 3,038
Coolant to oil should be much the same as coolant to air.

I've only used the small rectangular bottles (about 5.00). Tablets are available on Amazon, but I would look in Halfords first, as I'm always weary of products that might potentially be counterfeit.
jdhturner is offline  
post #9 of 11 (permalink) Old 19-03-2016, 19:59 Thread Starter
Registered User
 
Join Date: Feb 2011
Car: Rover 45
Posts: 211
Quote:
Originally Posted by jdhturner View Post
Coolant to oil should be much the same as coolant to air.

I've only used the small rectangular bottles (about 5.00). Tablets are available on Amazon, but I would look in Halfords first, as I'm always weary of products that might potentially be counterfeit.

What troubles me is - why only mention coolant-to-oil in the datasheet of only one product. Tablets from Amazon seem to be US markets - signing up to those websites asks for zip code.

I've just had a very disturbing thought...

My test results could indicate liner movement - coolant to oil via the compromised hydromar sealant at the bottom of the liners. I do have a piston slap type rattle when cold - actually liner rattle?
Bunsen Honeydew is offline  
post #10 of 11 (permalink) Old 20-03-2016, 11:59
Registered User
 
Join Date: Oct 2004
Car: Rover 45
Posts: 218
Quote:
Originally Posted by Talkingcars View Post
I'd be worried about inducing HGF pumping it with compressed air.

Pressure testing the coolant system is a common practice in garages. It normally just involves screwing a connector on to the expansion tank and pressurising the system.
Fast Guy is offline  
post #11 of 11 (permalink) Old 22-03-2016, 21:07
Registered User
 
Join Date: Oct 2008
Car: Rover 400 (95-99)
Posts: 3,038
Quote:
My test results could indicate liner movement - coolant to oil via the compromised hydromar sealant at the bottom of the liners. I do have a piston slap type rattle when cold - actually liner rattle?
I suspect you're over-thinking the problem. If a liner had slipped you would have major head gasket symptoms, not just coolant leakage into the oil.
jdhturner is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MG-Rover.org Forums 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Marussia Test Driver seriously injured during test Celestial 20 General Motorsport 22 17-07-2012 06:16
Interesting 25 review/test by AA in 2000 iammrarteest MG ZR / Rover 25, 200 & Streetwise 9 12-04-2012 12:31
Driving Test Success 3 DVD roms, Theory Test, Practical Test and Practical. clockworx For Sale 0 18-03-2011 12:26
AC Compressor DEViANCE MG ZT / Rover 75 (Sponsored by Rimmer Bros) 2 21-10-2010 19:09
A/C Compressor Adam MG ZT / Rover 75 (Sponsored by Rimmer Bros) 6 04-07-2008 15:16

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