Replace the front main (crankshaft front) seal on a 2016-2021 Honda Civic 1.5L Turbo engine by removing the crankshaft pulley, timing cover, and installing a new seal.

Warnings

Tools required

Parts

• Front crankshaft seal × 1 — 91212-5BA-003 or equivalent
• Timing cover gasket × 1 — Use OEM specification
• Crankshaft pulley bolt (if TTY) × 1 — Check service manual for TTY specification
• Engine oil × 1 — Honda Genuine 0W-20
• Oil drain plug crush washer × 1 — 94109-14000
• RTV silicone gasket maker × 1 — Honda Bond HT or equivalent

Fluids

• Honda Genuine 0W-20 — 4 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and wait 3 minutes for SRS system discharge
3. Raise front of vehicle and support securely on jack stands
4. Remove front passenger wheel and inner fender splash shield for access
5. Remove engine cover from top of engine
6. Drain engine oil completely and install drain plug with new crush washer
7. Remove drive belt by releasing tensioner
8. Support engine from below with jack and wood block under oil pan

Procedure

1. 1

   Remove right side engine mount
   Remove the upper engine mount bracket bolts and the mount-to-frame bolts to gain access to the timing cover area. Support the engine weight with a jack before removing mount completely. This provides necessary clearance for crankshaft pulley removal.
   Torque spec

   Mounting Bolts45 Nm (33 lb-ft)
2. 2

   Lock crankshaft and remove pulley bolt
   Install crankshaft holding tool or flywheel locking tool through bellhousing access. Use impact wrench to remove the crankshaft pulley bolt (turning counterclockwise). This bolt is extremely tight at 180 Nm and typically requires impact tools for removal. Set bolt aside and inspect for stretching if TTY type.
   ⚠️Ensure crankshaft is properly locked before attempting bolt removal. Engine rotation under load can cause serious injury.
   Torque spec

   Crankshaft Pulley Bolt180 Nm (133 lb-ft)
3. 3

   Remove crankshaft pulley/harmonic balancer
   With bolt removed, pull the crankshaft pulley straight off the crankshaft snout. May require gentle prying with two pry bars on opposite sides or use of harmonic balancer puller. Do not hammer or strike the pulley. Inspect keyway on crankshaft for damage.
4. 4

   Remove CKP sensor and front cover bolts
   Disconnect the crankshaft position (CKP) sensor electrical connector and remove the sensor mounting bolt. Remove sensor from timing cover. Remove all timing cover bolts, noting the different lengths and locations. There are multiple 10mm bolts (45 Nm spec) and 8mm bolts (25 Nm spec) in specific positions.
   Torque spec

   Sensor Bolts10 Nm (8 lb-ft)

   Cover Bolts15 Nm (11 lb-ft)
5. 5

   Remove front oil pan bolts
   Remove only the front section oil pan bolts that attach to the timing cover area. These are typically 4-6 bolts along the front edge of the oil pan. Do not remove the entire oil pan. Keep track of bolt locations as they may be different lengths.
   ℹ️Only remove oil pan bolts in the front section where they interface with timing cover. Full pan removal is not necessary.
   Torque spec

   Oil Pan Bolts12 Nm (9 lb-ft)
6. 6

   Remove timing cover
   Carefully separate the timing cover from the engine block by gently prying at designated pry points (usually cast into the cover). Break the gasket seal evenly around the perimeter. Once loose, pull cover straight off to avoid damaging timing components. Inspect timing chain and guides while exposed.
   ⚠Do not damage timing cover mating surfaces. Scratches or gouges will cause oil leaks.
7. 7

   Mark timing position and install locking pins
   Verify engine is at TDC cylinder #1 compression stroke. Install timing pins through timing cover mounting holes into camshafts and crankshaft timing marks. This locks the timing components in position. Take photos of timing marks for reference before proceeding.
   ⚠️Verify timing marks are correctly aligned before removing any timing components. Incorrect timing will cause valve-to-piston contact and engine damage.
8. 8

   Remove old front main seal
   Using seal removal tool or seal puller, carefully extract the old crankshaft front seal from the timing cover. Work evenly around the seal to prevent cocking. If using a pick or screwdriver, be extremely careful not to score the seal bore in the timing cover. Clean the seal bore thoroughly with degreaser and inspect for damage or wear.
   ⚠Do not damage the seal bore surface. Scratches or nicks will cause the new seal to leak.
9. 9

   Install new front main seal
   Lightly oil the outer edge and sealing lip of the new front seal with clean engine oil. Position seal squarely in the timing cover bore with spring side facing inward (toward engine). Use appropriate size seal driver or large socket to drive seal evenly into bore until fully seated and flush with cover surface. Drive seal straight to prevent cocking.
   ℹ️Ensure seal is driven completely flush and square. Crooked installation will result in immediate oil leaks.
10. 10

    Clean all mating surfaces
    Thoroughly clean the engine block timing cover mating surface and the timing cover interior surface using plastic gasket scraper. Remove all old gasket material and RTV sealant. Clean with degreaser and wipe dry with lint-free cloths. Ensure oil pan flange and timing cover flange are completely clean where they meet.
11. 11

    Apply RTV and install new gasket
    Apply a continuous 2-3mm bead of Honda Bond HT or equivalent RTV to the engine block at the timing cover-to-oil pan junction points (two corners where timing cover meets oil pan). Install new timing cover gasket onto the engine block, ensuring all alignment pins and bolt holes are properly positioned. Do not reuse old gasket.
    ℹ️RTV must be applied at oil pan junction points to prevent leaks. Allow proper cure time per RTV manufacturer specifications.
12. 12

    Install timing cover
    Carefully position timing cover over crankshaft snout and align with engine block. Ensure gasket remains properly positioned. Install all timing cover bolts finger-tight first, then torque in sequence from center outward. Tighten 10mm bolts to 45 Nm and 8mm bolts to 25 Nm. Install front oil pan bolts to 12 Nm. Reinstall CKP sensor and torque to 10 Nm.
    ⚠Follow proper tightening sequence to prevent cover warping and ensure proper seal compression.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)

    Oil Pan Bolts12 Nm (9 lb-ft)

    Sensor Bolts10 Nm (8 lb-ft)
13. 13

    Install crankshaft pulley
    Ensure crankshaft snout and inside of pulley hub are clean and dry. Align pulley keyway with crankshaft key and slide pulley onto crankshaft. Install crankshaft pulley bolt (new bolt if TTY type). With crankshaft still locked, torque bolt to 180 Nm. If procedure specifies additional angle tightening, follow manufacturer specifications exactly.
    ℹ️If bolt is TTY type, it must be replaced with new bolt. Do not reuse stretched bolts.
    Torque spec

    Harmonic Balancer Bolt180 Nm (133 lb-ft)
14. 14

    Reinstall engine mount and accessories
    Remove engine support jack. Reinstall right side engine mount and torque mounting bolts to specified values (26 Nm for smaller bolts, 45 Nm for critical mount bolts). Reinstall drive belt by rotating tensioner. Reinstall inner fender splash shield and wheel. Torque wheel lug nuts to specification.
    Torque spec

    Mounting Bolts45 Nm (33 lb-ft)

Reassembly

1. Remove timing locking pins before attempting to rotate engine
2. Refill engine with 4.0 quarts of Honda Genuine 0W-20 engine oil
3. Reconnect negative battery cable
4. Lower vehicle from jack stands
5. Do not start engine immediately - perform verification steps first

Verification

• Visually inspect timing cover area for proper gasket seating and RTV application
• Manually rotate crankshaft two complete revolutions by hand (using breaker bar on crankshaft bolt) to verify smooth rotation and no binding
• Verify timing marks realign correctly after two complete revolutions
• Start engine and verify no oil leaks from timing cover or front main seal area
• Allow engine to reach operating temperature and recheck for leaks
• Check engine oil level and top off if necessary
• Verify no abnormal noises from timing chain or front cover area
• Test drive vehicle and monitor oil pressure gauge for normal readings

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