Main Journal Oil Clearance

Discussion in 'ENGINE' started by -BenGTTurbo-, Jul 9, 2019 at 8:32 PM.

  1. -BenGTTurbo-

    -BenGTTurbo- Registered User +

    Hello, back in a starlet after selling my old GT 7 years ago. I have bought another GT and in the process of a full engine rebuild. I have found some specs online for the main crank journal bearings but I'm a bit confused.

    Main journal oil clearance:

    STD = 0.016-0.049mm

    U/S 0.25 = 0.017-0.061mm

    Limit = 0.08mm

    I have a polished crank with new std size ACL main bearings measuring 0.050mm using a plastigauge. Are these still in spec?

    Thanks
     
    -BenGTTurbo-, Jul 9, 2019 at 8:32 PM
    #1
  2. Skalabala

    Skalabala Registered User +

    Yes, perfect. Make sure to raise your oil pressure.
    Did you get 0.050mm on all 5 journals?
     
    Skalabala, Jul 10, 2019 at 5:02 AM
    #2
  3. -BenGTTurbo-

    -BenGTTurbo- Registered User +

    Well from what I have read they are out of spec but I dont understand the 0.08mm limit bit?

    Yes more or less across all 5 are 0.050
     
    -BenGTTurbo-, Jul 10, 2019 at 12:39 PM
    #3
  4. Skalabala

    Skalabala Registered User +

    Limit is when you need to regrind the crank.
    You will be fine. Make sure you use the correct oil for your climate.
    I use Shell Helix HX3
     
    Skalabala, Jul 11, 2019 at 4:54 AM
    #4

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