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  1. #1

    Gtx 4tec connecting rod big end clearances

    Good day everyone. Just curious if anyone had specs for connecting rod big end clearance on these 4tec motors. I have a manual and all they list is the service limit. Is there a min and max spec?

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    tiderider's Avatar
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    Quote Originally Posted by mpirpre View Post
    Good day everyone. Just curious if anyone had specs for connecting rod big end clearance on these 4tec motors. I have a manual and all they list is the service limit. Is there a min and max spec?

    Crankshaft Pin maximum 45.048 1.7735
    Crankshaft Pin Minimum 45.032 1.7729
    Crankshaft Pin Service limit 45.029 1.7728

    Crankshaft Pin Radial Clearances service limit 0.09 0.0035

  3. #3
    I saw those specs. How would you figure out the min and max clearances for the connecting rod bearings using those specs?

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    ncdoo's Avatar
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    This is the max:
    Crankshaft Pin Radial Clearances service limit 0.09 0.0035
    A good rule of thumb is .001" for every 1" diameter of the crank pin journal which is approx. 1.77"
    So I run a min of .002" to be safe.

  5. #5
    Ok. Thanks. So there’s nothing written in the manual for minimums?

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    ncdoo's Avatar
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    I've never found anything on minimums. .0015 would be what I recommend for minimum.

  7. #7
    Ok. Thanks! When you check the clearance with plastigauge do you torque to 33ft lb + 90 degrees or is torquing to 33 enough just for checking the clearance?

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    ncdoo's Avatar
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    I use the old rod bolts and
    torque to 33ft lb + 90 degrees when checking the clearance.

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    tiderider's Avatar
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    Quote Originally Posted by mpirpre View Post
    Ok. Thanks! When you check the clearance with plastigauge do you torque to 33ft lb + 90 degrees or is torquing to 33 enough just for checking the clearance?

    I check clearance with a bore gauge. Just to let you know that if your crankshaft journals are within specs, using WSM bearings work well for clearances at a fraction of the cost to OEM with the same quality. My clearances where anywhere between .0025 and .0028 with WSM bearings.

  10. #10
    Quote Originally Posted by ncdoo View Post
    I use the old rod bolts and
    torque to 33ft lb + 90 degrees when checking the clearance.
    Ok. Perfect! Thanks for all your help!


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