View Full Version : Radiator Cap Pressure
TimmyTXJ
07-24-2014, 07:40 AM
Hey guys,
Stupid question... what's the CORRECT pressure rating (Like from the FSM) for the radiator cap ('93 w/ 4.0)? My Haynes Manual says 16 to 18psi but every parts store I've hit online shows a 13psi cap.
Carves
07-24-2014, 08:05 AM
Havent got a 93 FSM ... but the '93 part number is J323 9375.
From the '94 and onwards FSM's
RADIATOR PRESSURE CAP
All radiators are equipped with a pressure cap.
This cap releases pressure at some point within a range of 83-110 kPa (12-16 psi). The pressure relief point (in pounds) is engraved on top of the cap (Fig. 5).
Fig. 5 in those FSMs ... show a cap with 16psi marked on it.
TimmyTXJ
07-24-2014, 09:44 AM
Thanks Carves! That part number pulls a 13psi cap so I reckon I shall stick with that.
finneys98xj
07-24-2014, 11:20 AM
Yea 13 is what have
TimmyTXJ
07-29-2014, 09:04 AM
FYI,
Installing a new radiator cap (13psi) was good for about a 5 degree reduction in engine temp. Such a simple thing but I'm willing to bet most folks forget about this when chasing overheating problems.
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