Bleeding the cooling system. W58

[kalinowski]

I had to replace my old exhaust manifold (1980-pin holes) with a newer one. The newer model has a petcock on top. Is the purpose of the petcock to bleed air in the system?

Im also seeing coolant gurgling up the hose to the reservoir. Should the reservoir hose be filled with coolant with no air bubbles?

Dan Kalinowski
Jolly Lama #135
Ko Olina, O’ahu

[madsailor]

Hi Dan,

Yes, that’s exactly what the petcock is for. You’ll notice it’s at what is
usually the higher side of the engine.

There may be bubbles in the coolant going up the tube for the first few
hours of running but generally no longer than that. Make sure when the
engine is cool there is still coolant in the recovery tank.

Bob

I’m not being terse. This is from my mobile.
On Jan 5, 2012 9:37 PM, “kalinowski” wrote:

I had to replace my old exhaust manifold (1980-pin holes) with a newer
one. The newer model has a petcock on top. Is the purpose of the petcock
to bleed air in the system?

Im also seeing coolant gurgling up the hose to the reservoir. Should the
reservoir hose be filled with coolant with no air bubbles?

Dan Kalinowski
Jolly Lama #135
Ko Olina, O’ahu

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[RLeeds]

Dan-
Are you saying there is a small diameter hose that is connected to your
petcock that goes up to the coolant recovery tank? or are the bubbles you
refer to from the main fill hose from the bottom of the recovery tank? I
have nothing connected to my petcock on the exhaust manifold.

Rodd
Windseeker, #214

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Original Message

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[kalinowski]

Thanks for clarifying the bleeding process. Once I noticed the air bubbles going up the hose from the manifold to the reservoir tank, I opened the petcock and let air out. The bubbles would then stop for a while. I didn’t realize that it took so long to get all the air out. Can I assume that when the tube is fully filled to the reservoir with no bubbles that the system is fully bled?

By the way, be careful what coolant system flush you use. Some are not friendly to aluminum, as I found out (pin holes in manifold inlet/outlet ports).

Dan Kalinowski
Jolly Lama #135
Ko Olina, O’ahu

[Author]

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