Another track day , didn't quite make it :(

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Jun 28, 2020 | 11:45 AM

#21

kj07xk

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From: Naperville, Illinois USA

Quote:

Originally Posted by steve_k_xk

That's a little misleading in order to test the radiator pressurise to 20psi however in order to not cause potential damage please do not exceed 14.5psi as damage might occur ????

I blame such things on Google translate not understanding the native language....

Jun 28, 2020 | 02:21 PM

#22

AlexJag

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From: San Diego CA

Quote:

Originally Posted by u102768

The 4.2L workshop manual is a little confusing actually.

Under the section for 'cooling system pressure test' is says:

Pressurize the cooling system to the coolant expansion tank pressure cap lower limit.

Under the section for 'Radiator Leak Test - Removed from the Vehicle' it says:

Leak test the radiator in clean water with 138 kPa (20 psi) air pressure.

Under the section for 'cooling system flushing' it says:

Connect a hose pipe to the radiator upper coolant hose connection
using a suitable connector.

CAUTION: Radiator internal pressure must not exceed 100 kPa
(14.5 psi). Failure to follow this instruction may cause damage to
the radiator.

Thats so confusing 20psi yet internal pressure of 14.5 maximum ( scratching my head) . Can you put up screen shots please.

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2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp

Jun 28, 2020 | 02:30 PM

#23

gkubrak

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From: CT, USA

You weren't doing a flush or a radiator leak test in clean water, so I wouldn't pay attention to those. They are separate procedures with separate requirements.

Go with the 15 psi max that Jahummer mentioned from the manual.

I suggest cleaning up, then driving around for a few days. Then check for coolant loss/leask. If it wasn't leaking @ 15 PSI then the car shouldn't ever see anything higher.

Last edited by gkubrak; Jun 28, 2020 at 02:36 PM.

Jun 28, 2020 | 02:46 PM

#24

AlexJag

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From: San Diego CA

Quote:

Originally Posted by gkubrak

Well it already leaked and multiple hoses assuming from overpressure at 20psi that the mechanic applied so I assume they damaged the radiator? It never leaked before though , only the water pump

Last edited by AlexJag; Jun 28, 2020 at 03:02 PM.

Jun 28, 2020 | 05:57 PM

#25

jahummer

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From: Florida

I am not experienced enough to know what the 5 PSI difference would make as far as what could be damaged, BUT your car is at the age and mileage where it would be expected that rubber coolant hoses would fail so you really should not be surprised and if you intend to continue to track the car it would be highly advisable to perform some preventive maintenance so you don't have such a failure on the track

Jun 30, 2020 | 11:42 PM

#26

AlexJag

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From: San Diego CA

Quote:

Originally Posted by jahummer

Here is the thing, when pump started leaking originally about 3-4 months ago , I stopped by at independent Jagaur shop and they tested and pressurized the system and found no leaks. They told me that failing water pump is probably leaking some when cold until bearing seals expand , but nothing else leaked, compared to now , these guys had replaced 4 coolant hoses that leaked and a found a leaking radiator and told me it was pressurized up to 20psi , after I talked today they are playing a different tune and now saying the pressurized only up to 14.5 as per manual. Trying to cover their mistake it sounds like

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Jul 1, 2020 | 06:28 AM

#27

jahummer

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From: Florida

Did they put their original diagnosis in writing? If not, you likely are at their mercy, unfortunately.

Jul 1, 2020 | 06:30 AM

#28

Aarcuda

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It should be fine at 20 psi. It may have stressed it a little to find the weak spots but the system should have held it in my opinion. That stuff was gonna blow soon on a very inopportune time