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Thread: Radiator Cap Pressure

  1. #1
    Join Date
    Sep 2012
    Location
    Houston
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    727

    Default Radiator Cap Pressure

    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.

  2. #2
    Join Date
    Aug 2011
    Location
    NSW Australia
    Posts
    5,210

    Default Re: Radiator Cap Pressure

    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.
    I hate watching simplicity and reliability being ruined by bureaucracy and technology.

    Quote Originally Posted by MattybPDX
    If my jeep is going to be a grocery getter it's at least going to be a friggin awesome one.

  3. #3
    Join Date
    Sep 2012
    Location
    Houston
    Posts
    727

    Default Re: Radiator Cap Pressure

    Thanks Carves! That part number pulls a 13psi cap so I reckon I shall stick with that.

  4. #4
    Join Date
    Jun 2009
    Location
    Sandy Level VA
    Posts
    613

    Default Re: Radiator Cap Pressure

    Yea 13 is what have
    91 aw4 Dana 30 and 8.8 with 4.56s, 6in rough country long arm kit, hd offroad shackle relocation, 33s, Va fan full width front bumper, brown dog poly motor mount to go with a fresh long block.

  5. #5
    Join Date
    Sep 2012
    Location
    Houston
    Posts
    727

    Default Re: Radiator Cap Pressure

    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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