Quote:
Originally Posted by BoomerBob
After blowing my engine from overheating by installing a new 16 psi radiator cap which caused my top radiator hose to blow off; I'm nearing the completion of the full top end rebuild with new hoses and radiator. I want to verify I'm using the right lb rating so I don't do this again.
Does anyone know for sure which one it is. Yes, I can buy the Toyota cap, but I may get one with the temp gauge built in so I visually see the temp of the coolant.
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I don't think even Toyota really knows. I can absolutely guarantee that my rig came from the factory with a 0.9 Bar (13psi) cap; the pressure was stamped right on the turning tab.
The 2001 and 2002 MY came with a 1.1 Bar cap.
That is almost 16 psi.
The FSM says it the range centers around 0.9 Bar (13psi), but the range is 10.7 - 14.9 psi. So why were they selling 1.1 Bar caps for our rigs? At one point, they were selling the 1.1s as replacements for the 0.9s for all years. Now they just sell 0.9. (16401-20353).
http://www.teamtoyota4x4.org/archivi...e/radi/ovi.pdf
Quote:
2. INSPECT RADIATOR CAP
NOTICE:
If the radiator cap has contaminations, always rinse
it with water.
When performing steps (a) and (b) below, keep the radiator cap tester at an angle of over 30° above the horizontal.
Before using a radiator cap tester, wet the relief valve
with engine coolant or water.
(a) Using a radiator cap tester, slowly pump the tester and
check that air is coming from the vacuum valve.
Pump speed: 1 push/(3 seconds or more)
NOTICE:
Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator
cap.
(b) Pump the tester and measure the relief valve opening
pressure.
Pump speed: within 1 second/1 push
NOTICE:
This pump speed is for the first pump only (in order to close
the vacuum valve). After this, the pump speed can be reduced.
Standard opening pressure:
74-103 kPa (0.75-1.05 kgf/cm2, 10.7 - 14.9 psi)
Minimum opening pressure:
59 kPa (0.6 kgf/cm2, 8.5 psi)
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Note: This is from the 2002, but my '99 FSM says the exact same thing.
Anyway, I stick with the 0.9 Bar (13psi) currently sold by the dealers.
This has all been debated over the years if you really want to search.
I doubt anything bad will come from using the 16 psi cap given that it was the original spec for 2001-2002, although your experience suggests differently.
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
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