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Crankshaft oil seals - renewal
In-car engine repair procedures / Crankshaft oil seals - renewal


Note: DonТt try to prise these seals out without removing the oil pump or seal carrier - the seals are too soft, and the amount of space available is too small, for this to be possible without considerable risk of damage to the seal housing and/or the crankshaft journal. Follow exactly the procedure given below.

Right-hand seal
1 Remove the oil pump (see Section 16).

2 Drive the oil seal out of the pump from behind (see illustration).

20.2 Driving out crankshaft right-hand oil seal
20.2 Driving out crankshaft right-hand oil seal

3 Clean the seal housing and crankshaft, polishing off any burrs or raised edges, which may have caused the seal to fail in the first place.

4 Refit the oil pump (see Section 16). Grease the lips and periphery of the new seal, to ease installation.

5 To fit a new seal, Ford recommend the use of their service tool 21-093A, with the crankshaft pulley bolt, to draw the seal into place; an alternative can be arranged using a socket of suitable size, with a washer to match the crankshaft pulley bolt (see illustration).

20.5 Socket of correct size can be used to replace Ford service tool, drawing
20.5 Socket of correct size can be used to replace Ford service tool, drawing new seal into place as described

6 If such tools are not available, press the seal squarely into place by hand; tap it in until it is flush with the pump housing, using a softfaced mallet and a socket with an outside diameter only slightly smaller than the sealТs (see illustration). This approach requires great care, to ensure that the seal is fitted squarely, without distortion or damage.

20.6 If seal is tapped into place as shown, exercise great care to prevent
20.6 If seal is tapped into place as shown, exercise great care to prevent seal from being damaged or distorted

7 Wash off any traces of oil. The remainder of reassembly is the reverse of the removal procedure, referring to the relevant text for details where required. Check for signs of oil leakage when the engine is restarted.

Left-hand seal
8 Remove the transmission (see the relevant Part of Chapter 7).

9 Where appropriate, remove the clutch (Chapter 8).

10 Unbolt the flywheel/driveplate (see Section 21).

11 Remove the sump (see Section 15).

12 Unbolt the oil seal carrier (see illustration). Remove and discard its gasket.

20.12 Unscrew bolts (arrowed) to remove crankshaft left-hand oil seal carrier
20.12 Unscrew bolts (arrowed) to remove crankshaft left-hand oil seal carrier . . .

13 Supporting the carrier evenly on wooden blocks, drive the oil seal out of the carrier from behind (see illustration).

20.13 . . . and ensure that carrier is properly supported when driving out
20.13 . . . and ensure that carrier is properly supported when driving out used oil seal - note notches provided in carrier for drift

14 Clean the seal housing and crankshaft, polishing off any burrs or raised edges, which may have caused the seal to fail in the first place. Clean also the mating surfaces of the cylinder block/crankcase and carrier, using a scraper to remove all traces of the old gasket - be careful not to scratch or damage the material of either - then use a suitable solvent to degrease them.

15 Use grease to stick the new gasket in place on the cylinder block/crankcase, then offer up the carrier (see illustration).

20.15 Use new gasket when refitting lefthand oil seal carrier
20.15 Use new gasket when refitting lefthand oil seal carrier

16 Using a suitable straight edge and feeler gauges, check that the carrier is both centred exactly around the crankshaft, and aligned squarely so that its (sump) mating surface is exactly the same amount - between 0.3 and 0.8 mm - below that of the cylinder block/crankcase on each side of the crankshaft. Being careful not to disturb the gasket, move the carrier into the correct position, and tighten its bolts to the specified torque wrench setting (see illustration).

20.16 Check the oil seal carrier is correctly positioned
20.16 Check the oil seal carrier is correctly positioned

17 Check that the carrier is correctly located; if necessary, unbolt it again, and repeat the full procedure to ensure that the carrier is correctly aligned.

18 FordТs recommended method of seal fitting is to use service tool 21-141, with two flywheel bolts to draw the seal into place. If this is not available, make up a guide from a thin sheet of plastic or similar, lubricate the lips of the new seal and the crankshaft shoulder with grease, then offer up the seal, with the guide feeding the sealТs lips over the crankshaft shoulder (see illustration). Press the seal evenly into its housing by hand only, and use a soft-faced mallet gently to tap it into place until it is flush with the surrounding housing.

20.18 Using guide made from thin sheet of plastic to slide oil seal lips over
20.18 Using guide made from thin sheet of plastic to slide oil seal lips over crankshaft shoulder

19 Wipe off any surplus oil or grease; the remainder of the reassembly procedure is the reverse of dismantling, referring to the relevant text for details where required.

Check for signs of oil leakage when the engine is restarted.


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