470 coolant pressure test

[Benny67]

Greetings,
Looking for input on how long to expect a cold block to hold pressure testing for a coolant leak.

I pressurized the system at around 7psi and it bled off about 1psi after an hour or so. I'm assuming that it's acceptable.

Anyone have any input?

 

[nola mike]

 

[Benny67]

Thanks for the chart. I'll bump up the pressure tonight and retest.

I only went to 7 psi because the cap is usually rated to 12lb or so. I figured 7 was a reasonable number.

I did re do the test this morning and it held the 7 psi for at least 2 hrs or until I left for work. I left it pressurized to see if it holds all day.

My concern lies in that I found some antifreeze in the oil when I did my seasonal oil change. I did have a leak in the riser gasket (I just fixed it) and I want to confirm there isn't any other leaks (like the cam seals) I cleared the weephole and do not see any antifreeze. I would believe Im good to go as far as cleaning the oil again.However, I will retest at 17psi tonight.