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By Engine Builder

I have found differing torque values published for the 1.8L Toyota engine. What are the correct torque values?

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The AERA Technical Committee offers the following information regarding main bearing bolt torque specifications for 1998-2003 Toyota 1.8L 1ZZFE and 2ZZEGE engines. There has been some confusion as to the correct torque value for these engines. Some published information has stated “plus 90° and plus 90°” when the correct information should be “plus 45° and plus 45°.”

The bolts used to secure the main bearing caps may be
re-used if thread damage or bolt stretch does not exist. Refer to the following illustrations and steps to install the main bearing bolts.

Install 12-pointed head bearing cap sub-assembly bolts.

  1. Apply a light coat of engine oil on the threads and under the bearing cap sub-assembly bolts.

  2. Install and uniformly tighten the ten bearing cap sub-assembly bolts, in several passes, in the sequence shown in Figure 1, right. Torque to 16 ft.lbs. (22 Nm).

  3. Retighten the bearing cap sub-assembly bolts, in several passes, in the sequence shown. Torque the bolt to 32 ft.lbs. (44 Nm). If any of the bearing cap sub-assembly bolts do not meet the torque specification, replace the bearing cap sub-assembly bolt.

  4. Mark the front of the bearing cap and sub-assembly bolts with white paint.

  5. Retighten the bearing cap sub-assembly bolts by rotating the bolts in sequence 45°and 45° in the manner shown in Figure 2.

  6. Check that the painted mark is now at a 90° angle to the front.

Install hexagon head bearing cap sub-assembly bolts.

  1. Install and uniformly tighten the 10 bearing cap sub-assembly bolts in several passes and torque 14 ft.lbs. (18.5 Nm).

  2. Check that the crankshaft rotates smoothly with little effort.

  3. 2ZZGE engine: Apply adhesive to 2 or 3 threads, and install the 4 screw plugs. Adhesive: p/n 08833-00070, THREE BOND 1324, or equivalent and torque plugs to 32 ft.lbs. (43 Nm).

What is the proper way to install a rear main bearing seal with a metal sleeve on a 4.0L Ford engine?

The AERA Technical Committee recommends that you use the correct rear main seal installation tool (Ford p/n T95T-6701-A) to install the rear main seal with metal sleeve on 1990-2002 Ford 4.0L VIN X engines.

  1. Attach the rear crankshaft adapter to the rear of the crankshaft, using the supplied mounting screws.

  2. Apply a few drops of clean engine oil to the inboard side of the seal/sleeve at the area where the seal contacts the sleeve.

  3. Apply a very light film of clean engine oil on the inner diameter of the sleeve and the outer diameter of the seal.

  4. Slide the seal/sleeve over the rear crankshaft seal adapter, with flange to the rear of the engine.

  5. Use the rear crankshaft seal replacer and supplied bolt, to push the rear seal into the cylinder block. Remove rear crankshaft seal adapter. Note: It is normal for the seal to sit approximately .030? (0.76 mm) deeper than the sleeve flange. Do not adjust.

For information on receiving all of AERA’s regular monthly technical bulletins and other association services and benefits, call toll free 888-326-2372 or send an e-mail to [email protected].

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