Bleeding the Coolant system ?

[dave ridgway]

Hello everyone

I hope you all had a great Christmas. Most of mine was spent putting my engine back together. Got it all back in and fired her up to break in the cam to the new lifters. No major problems but it was ruuning a bit warm ( i think ) it was running at about 95-105 Degrees.

I suspect that I have air in the coolant system, what is the best way to bleed the air out ?

I am running a 383 Chevy with a standard Dax coolant system (ali Rad).

Any advice greatly appreciated !!

Cheers

Dave

[robert]

Dave

Where is the header tank in relation to the top of the rad?

Robert
UK CRC Forum Admin

http://www.cobraclub.com/flags/UK.gif

[dave ridgway]

The header tank is the highest point of the system with the outlet being at about the same height as the top of the Rad.

[robert]

Then you shouldn't get an airlock unless the feed to the the rad is lower than the top of the rad.

Did you do any other changes to the system?

Robert
UK CRC Forum Admin

http://www.cobraclub.com/flags/UK.gif

[dave ridgway]

the feed from the header tank goes down to the pipe from the bottom of the water pump which then goes to the bottom of the rad. Sorry for being daft but is this the feed or the return ie which way round is the coolent pumped, from the bottom of the rad to the top or from top to bottom ??

Thanks for your help

Cheers

dave

[russell_ram]

Always cold feed out to pump from bottom of rad - hot from engine into top of rad.

Russ

[dave ridgway]

In that case then the feed from the top of the engine is above the inlet to the rad.

So in theory I should have no air in the system, is there any easy ways of checking this ?

Thanks again

Dave

PS. What is the first event of the year as it is about time I got myself to one actually in the Cobra !

[robert]

Empty the system out and see if there are any bubbles in it. }( }( }(

How far out is the current temp from your normal runing temperature?

Robert
UK CRC Forum Admin

http://www.cobraclub.com/flags/UK.gif

[dave ridgway]

Yep I think I will do that. It is hard to say how much hotter it is because I have changed the temp gauge to a mechanical one as the electric one I had gave an inconsistant reading. The temp after running the car at about 2000 rpm for 20 minutes whilst stationary was about 102 degrees. Is this OK. ( this was during break in so maybe hotter than usual ?)

Dave

[robert]

Usually between 98 and 102, but depends on the specifics of the engine etc.

Might be worth putting the old guage on temporarily as that is the one you have the old readings with.

Robert
UK CRC Forum Admin

http://www.cobraclub.com/flags/UK.gif