A Coolant System Pressure Test (1 Viewer)

Bambusiero

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Apr 11, 2005
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712
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Chandler, AZ
As a follow-on diagnostic to an ongoing engine coolant overheating problem, coolant system pressure has been a question.
So, I've finally gotten around to rigging up a radiator / coolant system pressure gauge that can be monitored while driving around at speed, rather than just guessing and interpreting other signs.

The suspicion is a head gasket combustion gas leak into the coolant system, causing load dependent overheating.
Or, maybe it's something else.

The radiator cap is rated at 85 kPa = 0.85 bar = 12.3 psi (but it says 0.9 bar, rounded up).
So, if I see pressure rise up to 12-13 psi and hold, that must mean it's being pressure regulated by the pressure relief cap, and coolant is in the process of overflowing into the tank, right?
If I see that, I'll pull over and check it!

Let's just see about that!

Tapped into the #3 coolant bypass tube at the radiator nipple.
It's easy to tap in there.

Coolant System Pressure Gauge - equipment list :

0-30psi multi-purpose gauge, steel case, 2" dial, panel mount back, 1/8 MPT - McMaster-Carr
1/8" hose push fit to 1/8 MPT adapter - McMaster-Carr
1/8" nylon hose - McMaster-Carr
1/8 FPT-FPT coupler - Ace Hardware
5/16" barb Tee - Ace Hardware
5/16" barb to 1/8 MPT - O'Reilly Autoparts
Custom fab gauge to windshield wiper mount bracket


CoolantPressure_GaugeCockpitView.JPG


CoolantPressure_GaugeMountFrontView.JPG


CoolantPressure_GaugeMountCloseup.JPG


CoolantPressure_TubingTee.JPG


CoolantPressure_TubingAdapter.JPG


No data yet - TBD.
 
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Bambusiero

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Joined
Apr 11, 2005
Messages
712
Location
Chandler, AZ
A convenient hole is available in the firewall.
1/8" line just makes it through, and snakes right through the vent.
Easy-peasy.

CoolantPressure_FirewallPassThru.JPG
 

baldilocks

Battle Ground, WA
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Jan 29, 2014
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6,468
Location
Battle Ground
A convenient hole is available in the firewall.
1/8" line just makes it through, and snakes right through the vent.
Easy-peasy.

View attachment 1288543
What happened with this experiment? What was the resolution to your original warm running engine?

I too installed a CSF 2517 a year ago and could report just about the same sort of temps/situations. I have no data previous to the new radiator and cooling system overhaul because that's also when I installed the secondary water temp indicator.
 

flintknapper

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Joined
May 22, 2004
Messages
8,574
Location
Deep East Texas
What happened with this experiment? What was the resolution to your original warm running engine?

I too installed a CSF 2517 a year ago and could report just about the same sort of temps/situations. I have no data previous to the new radiator and cooling system overhaul because that's also when I installed the secondary water temp indicator.

Same radiator as I put in my '97 several years ago. I've had a ScanGauge on my vehicle for quite awhile so I had readings on the OEM radiator (under various conditions) with which to compare. On average (MY vehicle) runs about 2° F. warmer with the CSF 2517 than with the original radiator (factory).

I'm not a big of 'plastic' and crimped seals. The peace of mind is worth the paltry exchange of efficiency (2 degrees) to me.

Used a CSF replacement radiator in my LX 470 too when that 'plastic' unit failed. Now to be fair...the OEM units DO last a long time so I am not disparaging that radiator, but anytime I can put something stronger on my vehicles....I will do so.
 

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