You are right, it doesn't make sense, that is why I listed it here, strange that the 360 talks about testing at 5 bar (72 psi) just wanted to see what others thought. I don't expect a problem here, the head was flat but took 3 thou off just to give a good clean surface, I know some people are going to spit at me for this but I ALWAYS hylomar my head gaskets and this was no exception. Have torqued to 60nm +90deg (as per Ferrari WSM ) so I am prety sure all will be well but because most of the water system is not much fun to get at when the engine is in I just want to be sure and only takes a few minutes
What the **** **** ***** **** *****!!! Are you crazy man!! Dont you know the WSM is sh*t and is full of bad information? Just torque them FT (f*cken tight), that will do them.
I've given up trying to count the BS I've seen in Ferrari (and Lamborghini) manuals. The only reliable method is your own experience (assuming you have some). The WSM is helpful at showing you where the parts go but the numbers are frequently all over the place (as demonstrated here). I've seen recommended bolt torques that were several times what it would take to snap them off. I've seen a firing order that was obviously for a different car.
Of course, there are errors in the documentation, but I think you guys are looking at this particular issue in the wrong way. When you've got a volume of 10~15? liters of water under pressure, and are trying to detect a small leak (via measuring a change in pressure of the closed volume under pressure), in a VERY short time (10~15 minutes), you've got to be able to actually detect the volume that leaked out -- so you've got to crank the pressure up to exaggerate the leak (and doesn't hurt to confirm that the "pressure vessel" has a good burst margin even if the usual working pressure is only ~1 atm). Sure, if you've got more time (like a Shop doing a rebuild would have), using a few atm pressure overnight would probably be way good enough -- and, if you had a leak, it would be obvious by the size of the puddle on the floor. Although 150 psi seems high, it's not compared to the typical strengths of metals, but, maybe, their backing off to 5 atm pressure in that 360 documentation shows they were a little too close to crazy (or their ability to detect a leak got better, or they learned that they so rarely had small leaks that it wasn't worth it, etc....) Anyway, my point is that the "error" (if you want to assign one) in this case is taking a time-constrained production process and directly using it verbatim in a not-time-constrained service manual procedure -- JMO.
The point of checking the water tightness at this point in the assembly is for leaks around the head gasket and or the cylinder O-rings. For this test, you don't need to have a water pump, just block off the pipe. I did perform this test on a GT4 at 125 psi without a waterpump. I also learned not to stand in front of the whatever it is you are using to block it off in the event that it does let go. THe WSM is not always full of *****.
I did not read your post or did not understand it. If you are testing a closed water system everything attached then just pressure test like with a system tester around 1 atm. If you are pressure testing a block with heads thats a totally different story and the high pressure quoted make perfect sense to me.
Yes just testing the engine "OUT" no radiators or heater cores to worry about. Agree head gaskets should be able to take this and a lot more, but my main concern is the waterpump seal.... I have decided to split the difference and go to about 30psi and leave it over night and see what happens, if it hold pressure and does not leak, that will be good enough for me.
Great information - thanks. I did as you said and found this: http://www.hexagon.de/tasignat.htm I printed out a copy and stuck in the back of Ch. 3 of my copy of Carroll Smith's "Nuts, Bolts, Fasteners and Plumbing Handbook."
The sign in the manual between the 8 and the 10 is the european character for division...8/10 i remember seeing a few quirky things like that in my manuals.
