Bleeding the E34 Cooling system

[632 Regal]

For the uninitiated, M50 and M60 engines aren't so finickity- and the bleeder screw is incorporated into the top of the radiator. The car auto bleeds to a much larger extent, so you usually only have to bleed once and top off a few times.

As much as the M20, M30 and M70 are harder than others

I have personal experience with the M60 and M70. There is no bleed procedure which is why I like them. They self bleed, no screw to temp to the red zone (would freak me out). Not sure as no experience but my first sense says not a good idea. AU might be different?

As for 6 cylinders I am still learning as I hope to scoop a few of the failed bleed cars up for cheap. Close to Atlanta GA and there are a ton of failed bleed victims. New radiators, water pumps, gaskets etc. Fix em flip em.

[genphreak]

I have personal experience with the M60 and M70. There is no bleed procedure which is why I like them. They self bleed, no screw to temp to the red zone (would freak me out). Not sure as no experience but my first sense says not a good idea. AU might be different?

As for 6 cylinders I am still learning as I hope to scoop a few of the failed bleed cars up for cheap. Close to Atlanta GA and there are a ton of failed bleed victims. New radiators, water pumps, gaskets etc. Fix em flip em.

Ooops- My bad- M60 and M70 self bleed. No bleed screw in the raadiator like the M50 or water neck like M20 and M30.

[Victor]

Wow. I'd be reluctant to see my (M50TU) engine get that hot. I've never seen it past the halfway point. And especially if there are air pockets, I'd fear warping the head.

Bentley's procedure is characteristically scant, leaving much to the imagination...

[Rustam]

It would take a period of time within the red and likely a run under load, not just idle to damage the head or gasket. Most certainly nothing will occur if the needle just touches the red while idling. I even wait a few moments to let the needle go into red, to insure good steam.

Done this with FelPro and Victor Heinz gaskets many times.