Crankshaft: Service and Repair

REMOVAL
Remove the crankshaft sprocket, oil pan, pistons and connecting rods.
1. Using crankshaft oil seal tool No. MB995022, or equivalent, remove the front crankshaft oil seal.

NOTE: Be careful not to damage the seal surface of cover.

2. Pry out rear seal with screwdriver.

NOTE: Be careful not to nick or damage crankshaft flange seal surface or retainer bore.

3. Remove main bearing cap bedplate.
4. Remove bearing lower.
5. Remove crankshaft.
6. Remove bearing upper.
7. Remove knock sensor.
8. Remove oil pressure switch.
9. Remove oil level gauge (dipstick).

INSTALLATION
1. Install oil level gauge (dipstick).
2. Install oil pressure switch.
3. Install knock sensor and tighten to 10 Nm (7 ft. lbs.).

NOTE: Over or under tightening effects knock sensor performance, possibly causing improper spark control.





4. Select proper thickness main bearing shells.





NOTE: Upper and lower No. 3 bearing halves are flanged to carry the crankshaft thrust loads and are not interchangeable with any other bearing halves in the engine. Bearing shells are available in standard and the following undersized: 0.016 mm, 0.032 mm, 0.250 mm.
Never install an undersize bearing that will reduce clearance below specifications.





5. Install the main bearing shells with the lubrication groove in the cylinder block.

NOTE: All upper bearing shells in the crankcase have oil grooves. All lower bearing shells installed in the (bedplate) main bearing caps are plain. Crankshaft end play is controlled by a flanged bearing on the number three main bearing journal.

6. Make certain oil holes in block line up with oil hole in bearings and bearing tabs seat in the block tab slots.
7. Oil the bearings and journals and install crankshaft.

CAUTION: Do not get oil on bedplate mating surface. It may effect the sealer ability to seal the bedplate to cylinder block.





8. Apply 1.5 - 2.0 mm (0.059 - 0.078 inch) bead of Loctite 19614 to cylinder block as shown.
9. Install main bearing cap bedplate together with lower bearing shells.

CAUTION: Use only Loctite 19614, or equivalent, anaerobic sealer on the bedplate to cylinder block, or damage may occur to the engine.

10. Before installing the bolts, the threads should be oiled with engine oil.





11. Install main bearing bedplate to engine block bolts (1 thru 10) finger tight, then torque main bearing bolts to 75 Nm (55 ft. lbs.) in the sequence shown.
12. Install main bearing bedplate to engine block bolts (A thru K) finger tight, then torque each bolt to 28 Nm (20 ft. lbs.) in the sequence shown.





13. Install crankcase baffle into the opening in the block. Attach baffle to main bearing cap fasteners.





14. Place new front seal into opening with seal spring towards the inside of engine. Install seal by using seal installer tool No. MB995022, or equivalent, until flush with oil pump cover.

CAUTION: If burr or scratch is present on the crankshaft edge (chamfer), cleanup with 400 grit sand paper to prevent seal damage during installation of new seal.

NOTE: When installing seal, no lube on seal is needed.





15. Place pilot tool No. MB995059 (with magnetic base), or equivalent, on crankshaft.





16. Position seal over pilot tool. Make sure you can read the words "THIS SIDE OUT" on seal. Pilot tool should remain on crankshaft during installation of seal.





17. Drive the seal into the block using tool No. MB995060 and handle C-4171, or equivalents, until the tool bottoms out against the block.

NOTE: If the seal is driven into the block past flush, this may cause an oil leak.