SpeedTalk Store - Opinion Columns

filling up engine with coolant - getting all air out

General engine tech -- Drag Racing to Circle Track

Moderator: Team

filling up engine with coolant - getting all air out

Postby Belgian1979 » Sat Nov 17, 2012 3:45 am

I want to fill up the engine with coolant. Rad is lower than engine with an overflow tank.

What is the best way to get the air out of the engine as much as possible ?

BTW : Stewart thermostat, additional cooling lines to the center of the heads.
Belgian1979
Guru
Guru
 
Posts: 2151
Joined: Sat Mar 26, 2011 10:34 am

Re: filling up engine with coolant - getting all air out

Postby toolmakeron » Sat Nov 17, 2012 3:52 am

I realize that this may be a simple idea, but , can you lift the front of the car high enough that the top of the rad is higher than the engine? I have no idea just how much lower the rad is compared to the engine. Just an idea
Custombalancing.com
We Make Honey Out of Dogshit*
* some conditions apply.
toolmakeron
Pro
Pro
 
Posts: 342
Joined: Thu Dec 23, 2010 11:16 pm
Location: Calgary, Canada

Re: filling up engine with coolant - getting all air out

Postby jabba400 » Sat Nov 17, 2012 4:17 am

Holden got round this with a bleed screw in the top of the water neck in the block (the highest point of the system).

Perhaps run something similar, determine the highest point and drill and tap a hole to run a bolt. Fill radiator and overflow, then run engine till starts to warm and shut down. Loosen bolt until air starts to escape. When coolant starts coming out, re-tighten bolt. CHeck overflow and keep fluid in it as engine cools. Repeat a couple of times and should be good.
jabba400
New Member
New Member
 
Posts: 21
Joined: Tue Aug 21, 2012 12:04 am
Location: Kapiti Coast, New Zealand

Re: filling up engine with coolant - getting all air out

Postby MotionMachine » Sat Nov 17, 2012 7:25 am

I've never used or seen it but one of my customers has a vacuum operated coolant system tool that bleeds the air out. He says it saves me lots of time, no system burping necessary.
MotionMachine
Expert
Expert
 
Posts: 700
Joined: Thu Sep 16, 2010 9:01 am

Re: filling up engine with coolant - getting all air out

Postby robert1 » Sat Nov 17, 2012 8:00 am

Loosen both center cooling lines. Rig up something taller than these lines at the radiator cap and fill till the coolant comes out at the lines. Plan be fill the system as much as you can from the cap and then back fill from the center cooling lines. You could put coolant in one side at the lines until it comes out the other side but make sure both are purged of air. I have a Corvette that has the engine higher than the cap, pain in the butt to get filled correctly.
robert1
Guru
Guru
 
Posts: 2461
Joined: Fri Oct 26, 2007 7:26 pm
Location: missippippi

Re: filling up engine with coolant - getting all air out

Postby looper » Sat Nov 17, 2012 3:42 pm

Hi,
Adding A Air Bleeder At The High Spot. Drilling A Small Hole (1/8") On The Side Of The Thermostat Will Help Air Pass As You Fill.

There Are Radiator Hose Couplers That Have A Radiator Cap On It That Can Be Sliced Into The Upper Radiator Hose. Not Pretty But Works. I Have Seen Thermostat Housings With Radiator Caps On Them Also.

Good Luck
looper
looper
Member
Member
 
Posts: 74
Joined: Thu Aug 20, 2009 8:48 pm
Location: oregon

Re: filling up engine with coolant - getting all air out

Postby BrazilianZ28Camaro » Sat Nov 17, 2012 4:51 pm

If you have a thermostat valve installed would be good drill 3 to 4 1/8" holes on it to aid with system fill and engine cooling.

Looks like the beast is almost ready to come to life??? Keep us posted.
I'm just another Gearhead with a tool box, learning and helping.
User avatar
BrazilianZ28Camaro
Guru
Guru
 
Posts: 3271
Joined: Mon Feb 09, 2009 10:52 pm

Re: filling up engine with coolant - getting all air out

Postby Belgian1979 » Sat Nov 17, 2012 5:48 pm

BrazilianZ28Camaro wrote:If you have a thermostat valve installed would be good drill 3 to 4 1/8" holes on it to aid with system fill and engine cooling.

Looks like the beast is almost ready to come to life??? Keep us posted.


Yes, body was put back on yesterday after a looooong time.

Image
Image
Image
Image

Yes, Robert, these vettes are a PIA to get all the air out the system. I have an extra plug on the thermostat housing. that seems like the highest point. Will leave that open.

Do I need to disconnect the 2 center cooling lines ? Are these prone to having air in them ? The normally are lower than the radiator.
Belgian1979
Guru
Guru
 
Posts: 2151
Joined: Sat Mar 26, 2011 10:34 am

Re: filling up engine with coolant - getting all air out

Postby robert1 » Sat Nov 17, 2012 5:57 pm

It's just a good place to let air escape.
robert1
Guru
Guru
 
Posts: 2461
Joined: Fri Oct 26, 2007 7:26 pm
Location: missippippi

Re: filling up engine with coolant - getting all air out

Postby BrazilianZ28Camaro » Sat Nov 17, 2012 6:50 pm

Very nice restoration, I liked the crankase evacuation system.
I'm just another Gearhead with a tool box, learning and helping.
User avatar
BrazilianZ28Camaro
Guru
Guru
 
Posts: 3271
Joined: Mon Feb 09, 2009 10:52 pm

Re: filling up engine with coolant - getting all air out

Postby Belgian1979 » Sun Nov 18, 2012 2:46 am

BrazilianZ28Camaro wrote:Very nice restoration, I liked the crankase evacuation system.


Couldn't use the original one, since I'm going to run ITB's in the future and after break-in. Hopefully it gets enough vacuum. With the carbs I get to test it thoroughly.
Belgian1979
Guru
Guru
 
Posts: 2151
Joined: Sat Mar 26, 2011 10:34 am

Re: filling up engine with coolant - getting all air out

Postby hodge » Mon Nov 19, 2012 10:20 pm

Using the vacum fill will work, but when you remove cap fluid will come back out, like others said install bleed plug in thermostat housing, but you will have to put your recovery tank above the thermostat to allow a positive pressure fill when engine cools down. it will take a few cooling cycles to get all the air out. and do not take it on road trip till you do it. I've had other corvette owners over heat engines on the first road trip because they didn't listen. I would bleed the air out in front of them in amazement.
hodge
Expert
Expert
 
Posts: 720
Joined: Mon Jul 27, 2009 8:05 pm
Location: St Catharines Ontario

Re: filling up engine with coolant - getting all air out

Postby induction apprentice » Mon Nov 19, 2012 10:41 pm

All the ways suggested are good. I can add that most all radiator caps have a pressure relief valve as well as a vacuum valve. If the cap is functioning properly. The vacuum valve is designed to deal with that issue. Every time the engine cools down the air in the system shrinks causing enough vacuum to suck more fluid up in to the higher regions and will hold it there until the next heat cycle. After a few cycles. As long as the cooling system is totally sealed as it is supposed to be. It will bleed all the air out and self fill above the radiator level and will have purged the air out through the over flow bottle.

If this was not designed to do this. Most people driving vans would freeze in the winter with empty heater cores.

So a little patience and a good rad cap will probably do the trick. Those vacuum fill kits work very well. Would definitely speed up the process.
induction apprentice
Pro
Pro
 
Posts: 442
Joined: Sat Jun 30, 2012 2:12 am
Location: North Vancouver, British Columbia. Canada

Re: filling up engine with coolant - getting all air out

Postby ja411 » Sun Nov 25, 2012 7:47 pm

I would use a vaccum fill they work real good, maybe some one will let you borrow.
Does't intake have cool passage drilled for temp. senor etc. bleed there.
ja411
New Member
New Member
 
Posts: 23
Joined: Wed Jan 18, 2012 11:19 am


Return to Engine Tech

Who is online

Users browsing this forum: 396monteSS, BILL-C, Curtis Mc, flat screwd, Google [Bot], Jrivers, PackardV8, rubberweasel and 48 guests