Coolant pressure test
#1
Coolant pressure test
My 2010 Jaguar XK 5.0 Non Supercharged engine has a coolant reservoir cap rated at 200 kPa which is equivalent to close to 30 lbs. This is the factory cap that came with the car from new. I did change it once. If performing a coolant pressure test at the reservoir, what would be the suggested pressure to pump into the reservoir tank? I feel that 30 lbs is excessive and was planning on 15-17 lbs. Any feedback would be greatly appreciated.
#2
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#3
Kj07xk........I believe when you did your test your reservoir cap was rated at 120 kPa which equates to 17.4 lbs My cap is 200 kPa which is closer to 30lbs. Shouldn't I be pressurizing my system to a higher number than 14-15 (do to my 200Kpa cap) to get a more accurate outcome? There must be a reason Jaguar is using a 200kpa reservoir cap now instead of the previous 120 kPa cap. Also, your car is a 4.2 and mine is a 5.0 Thanks.
#4
15 - 20 psi would be fine for a leak-down test to check for loss of pressure. In fact, you could probably use half that and still see a pressure drop if the system has a leak.
I would probably start at 10 psi and see if that holds. If it doesn't then there is no need to go any higher. If it does hold, then try 15 psi. If that holds, the test has been passed.
Richard
I would probably start at 10 psi and see if that holds. If it doesn't then there is no need to go any higher. If it does hold, then try 15 psi. If that holds, the test has been passed.
Richard
#5
#6
Thanks jahammer for your imput. Yes, I am aware that supposedly the increase in the PSI on the reservoir caps are due to decreasing the boiling temps in order to protect our engines. There have been various discussions on this matter on how the increase in pressure can negatively affect our fragile plastic cooling lines, especially those with the seamed variants that have been vulnerable all along. I just wanted to make sure that I wasn't "pushing the envelope" when it came to increasing the pressures more than necessary for coolant pressure testing. Thanks again for your feedback.
Last edited by bocatrip; 12-21-2023 at 05:40 PM.
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#10
My concern with pure glycol based coolants is they aren’t as effective at cooling cylinder temps (heat’s also a JLR engine killer), they’re flammable (flashpoint of 225 degrees F) and they turn tyres into ice skates…. As such they’re prohibited from Motorsports use.
#11
Ethylene glycol is indeed gross stuff. Propylene glycol is not nasty as it dissolves easily with water and is non-toxic.. Evans is approved by the NHRA, AHRA and other racing bodies. That's one reason I use it in my P/S Mustang II.
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