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Can 0.5 over size main bearing effect the torque? Normal Nm is 50 but bolt breaks at 45Nm and they are new bolts.

I have tried to torque the main bearings to 50Nm but the bolt broke at +- 45Nm, could being 0.5 over size be the cause.

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  • Jeremy W.
    Jeremy W. Feb 22, 2012

    Year, make, model, and engine size?

  • Rene Rossouw
    Rene Rossouw Feb 22, 2012

    Your torque wrench calibration could be out. Make sure the bearings are the correct oversize for the journal (your engineering shop should have given you specs). Make sure you are using the correct unit of measurement ie Nm, ft-lbs etc.
    If you are using 50 thou oversize bearings on a standard crank you MAY get a bolt that breaks. Not likely. Rather check the above points.
    ps Over the counter bolts at your local Bolt-n-Nut will suffice if not the correct spec

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  • Cars & Trucks Master
  • 76,649 Answers

No the torque remains the same.

Posted on Feb 22, 2012

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SOURCE: Front caliper securing bolts torque

I know that it's a jag, and I know you are trying to be perfect, but in over thirty years, I've never seen a tech put a torque wrench on a caliper bolt. If you really want to I'd use about 35-40 foot pounds. (I go by bolt diameter) You don't have to slam them down but you don't want them to back out either. A bit over 35 is reasonable and should not damage anything and will keep them secure!
I have no idea what nm conversion is..

Posted on Apr 09, 2009

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SOURCE: torque specs for toyota tercel

Hello vienotkelly: The correct Main bolt torque is 42 foot pounds. The connecting rods torque to 29 foot pounds. The torque sequence for the head bolts and the correct way to tighten the bolts are attached to this reply. Thak You for using6bd0ae1.jpg FixYa. Roger

Posted on Apr 15, 2009

  • 72 Answers

SOURCE: Front Hub Bearing Torque specs to complete replacement

THE LUG NUT TORQUE SPEC - 140FT/LBS\
CALIPER MOUNT - 80FT/LBS
CALIPER BRACKET 129FT/LBS
AXLE NUT 177FT/LBS

Posted on May 09, 2009

terseo
  • 92 Answers

SOURCE: torque specs for 1998 tercel 1.5L

Main Bearing Cap Torque-42 Ft. Lbs.
Head Bolts Step 1-33 Ft. Lbs. Step 2- Additional 90 Degrees
Rod Bearing Nuts-29 Ft. Lbs.

Hope this helps

Posted on Sep 20, 2009

steve_e_uk
  • 1675 Answers

SOURCE: whats the torque setting for big end bearing bolt

hi big end bearings are two stage, 25nm leave ten mins, then 49nm cylinder head bolts three stages 20nm leave ten mins, 40nm leave ten mins then 60nm check after 5,000miles hope this helps

Posted on Apr 07, 2010

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98e175a.gif
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    71cd5b7.gif
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    98e175a.gif
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    71cd5b7.gif
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