Blown head gaskets?! - Rolls-Royce and Bentley Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 06-16-2017, 12:22 AM Thread Starter
New Member
 
Join Date: May 2017
Posts: 10
Blown head gaskets?!

Picking away on my 1974 acquisition...

Noticed the previous owner ran Evans waterless coolant. Was wondering why. Then noted I have a small leak of coolant. But only when car is running. Pressure tests fine at 15psi. I am thinking I have a blown head gasket! That is likely why the PO ran Evans.

Anyone have any perspective on this? The coolant appears to drip off around the bellhousing area. How many hours is replacing both head gaskets??

Thanks!

- Jason
trygve11 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 06-16-2017, 01:25 AM
New Member
 
Join Date: May 2015
Posts: 16
Hello,

I'm not familiar with the coolant you mentioned. However, considering your heater supply and return hoses runs from the engine bay through the firewall, it's quite possible one of those hoses could be leaking coolant onto the bell housing. Take your time and inspect the area carefully and confirm if indeed the coolant is or is not coming from the cylinder head.

Regards

Patrick
Patrick M is offline  
post #3 of 11 (permalink) Old 06-16-2017, 09:36 AM
New Member
 
Join Date: Mar 2017
Posts: 13
But doesnt waterless coolant have a higher "seep rate" than water? ie will leak where standard coolant wont ??
gjlelec is offline  
 
post #4 of 11 (permalink) Old 06-16-2017, 01:59 PM
Senior Member
 
Join Date: Mar 2012
Location: Las Vegas
Posts: 301
Hi Jason Sounds like something is amiss here. The pressure tests should be around 1-2 psi, not 15 psi as you have measured. This is because Evans coolant has a boiling point of 368F which means at normal engine running temperature of 200 - 210F (ish) there should be no system pressure. This is why you can safely remove the radiator cap on a hot engine. Could it be that water has been added to the Evans coolant at some time? I would not be too worried about the previous owner's motive for using Evans waterless coolant. It is used by many owners as an enhancement to the cooling system rather than in an effort to "cover things up". Regards changing the cylinder head gaskets: Make absolutely sure you need to before doing this. Judging from other owners experiences who have written on the forums, they often find the cylinder heads are very difficult to remove. They tend to become "welded" to the studs. Geoff

Last edited by Dounraey; 06-16-2017 at 02:01 PM.
Dounraey is offline  
post #5 of 11 (permalink) Old 06-16-2017, 05:01 PM
Member
 
Join Date: Jan 2017
Location: New York
Posts: 33
I would perform many tests before assuming the head gaskets are shot. The scope of work regarding head removal and everything involved is best left to someone with RR experience. You will find it practical to do other procedures because the block is exposed such as checking the for cam wear, waterpump bearing, valve work and so on.
Wraithman is online now  
post #6 of 11 (permalink) Old 06-17-2017, 01:25 PM
Senior Member
 
Adamski's Avatar
 
Join Date: Nov 2015
Location: London UK,Surrey
Posts: 213
Garage
I usually pressure test my cars to cap blow off rating. After all that is a worst case scenario. If it does not reasonably hold that pressure the leak will quickly manifest itself. If it is not visible it is either leaking into the interior through heater or into engine through blown head gasket. I start car and if pressure goes up then gasket must be blown as water jacket is receiving combustion pressure-hopefully not.
I had a radiator leak at top joint between core and top header tank, requiring an exchange unit although the car was running fine but it could have been catastrophic in a traffic snarl up.
Adamski is offline  
post #7 of 11 (permalink) Old 06-17-2017, 01:34 PM
Senior Member
 
Join Date: Aug 2016
Posts: 77
Garage
You can get test kits that "sniff" the coolant to see if there are combustion gases present in the cooling system. That's what I use to test head gaskets on my cars. Never tried it with RR yet!

Basically it's a syringe with a bulb on the end that draws air from the expansion bottle through liquid that changes colour if there are exhaust gases present.

  • 1984 Renault 5 Gordini Turbo
  • 1992 Renault 21 Turbo Quadra
  • 1992 Alpine Renault A610 Turbo
  • 1984 Rolls Royce Silver Spirit
r5gordini is offline  
post #8 of 11 (permalink) Old 06-19-2017, 10:11 PM Thread Starter
New Member
 
Join Date: May 2017
Posts: 10
Thanks guys.

Just an FYI, I am a professional mechanic and own my own shop. Also an ex-Ford engineer. So, I know a lot (but no one knows everything!)...

The coolant loss appears to be either via the head gaskets or perhaps some freeze plugs. I will investigate further.

As far as the Evans coolant, my understanding is that is doesn't create steam pressure and thus operates under reduced pressures. As such, any coolant leaks might be minimized by using it. That was just my operating hypothesis. Doesn't mean I am correct.

If the heads need to come off, I am not afraid of the job, just looking for perspective from anyone that's done it. I've done Ferrari V-12 rebuilds, etc. so I can pretty much handle anything. Machine shop would take the heads and do that work...

- Jason
trygve11 is offline  
post #9 of 11 (permalink) Old 06-20-2017, 05:23 PM
New Member
 
Join Date: Dec 2016
Posts: 10
Garage
If there is an extremely rapid build up of coolant pressure...that's not a good sign. I've noticed that you can actually smell the exhaust gas in the radiator...you might check for that?

The Evans factor...is not at issue here, in my opinion. I am, as we speak, facilitating changing my car to Evans. It greatest asset is ZERO corrosion. It also does not pressurize your cooling system, so not volcano eruptions and exploding hoses. The lack of pressure is also a relief to your radiator and heater core. I believe it also has a more consistent cooling of the system metals.

Evans is more likely to leak than water mixtures.

Let's assume it's a verified blown head gasket? I would investigate those 'head gasket repairs' in a can. A good friend of mine had his engine blow up, aluminum engine, blown head gasket. I suggested these type products as 'what's to lose'? $20?

He ran with the idea and researched all available products and selected the one that impressed him most.

That was 4 YEARS ago and his car is STILL going! Daily driver type thing and we live in the extreme desert where today it's 121F.

Please do not disregard theses products! They can work!

HOPE THIS HELPS!

Wm.
1987spur is offline  
post #10 of 11 (permalink) Old 06-20-2017, 10:46 PM Thread Starter
New Member
 
Join Date: May 2017
Posts: 10
Thanks. Any idea which product? Also, would it work with the Evans coolant??

Thanks.
trygve11 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Rolls-Royce and Bentley 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.



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



Posting Rules  
You may not post new threads
You may not 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
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.

SEO by vBSEO 3.6.1