Front Main Seal

This procedure replaces the front main crankshaft seal on the 2014-2019 Toyota Corolla 1.8L I4 engine, requiring removal of the crankshaft pulley and timing cover to access the seal.

Warnings

Tools required

Parts

• Front crankshaft oil seal × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Oil pan gasket (front section) × 1 — Use OEM specification or RTV sealant
• Engine oil drain plug crush washer × 1 — Use OEM specification
• Engine oil and filter × 1 — Use OEM specification

Fluids

• Toyota Genuine 0W-20 Engine Oil — 4.5 qt
• Toyota Super Long Life Coolant (Pink) — 1 qt

Preparation

1. Ensure engine is completely cold before beginning work
2. Disconnect negative battery terminal and secure away from battery post
3. Raise and support vehicle safely on jack stands
4. Remove engine under cover and splash shields
5. Place oil drain pan under engine and drain engine oil completely, installing drain plug with new crush washer
6. Remove right front wheel for better access to crankshaft pulley area
7. Remove drive belt(s) from crankshaft pulley
8. Support engine from above using engine support bar or from below with floor jack and wood block under oil pan

Procedure

1. 1

   Remove right engine mount
   Remove the right engine mount assembly to provide access to the timing cover area. Remove the mount mounting bolts, then remove the through-bolt. Support the engine weight with a floor jack or engine support bar before removing mount completely.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
2. 2

   Remove crankshaft pulley bolt
   Using an impact wrench, remove the crankshaft pulley bolt. If an impact wrench is unavailable, use a crankshaft holding tool or have an assistant hold the crankshaft from rotating by placing a breaker bar against a strong mounting point while removing the bolt. This bolt is extremely tight and likely torque-to-yield (TTY).
   ⚠️Never use the starter motor to hold the crankshaft. This can cause serious injury or damage to the starter and flywheel.
   Torque spec

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

   Remove crankshaft pulley/harmonic balancer
   Install a harmonic balancer puller onto the crankshaft pulley. Tighten the puller evenly to remove the pulley from the crankshaft snout. Do not pry or hammer on the pulley as this can damage the crankshaft or pulley. Inspect the pulley keyway and crankshaft key for damage.
4. 4

   Drain and disconnect coolant system components
   Partially drain the coolant to below the level of the timing cover (approximately 1 quart). Disconnect any coolant hoses attached to or near the timing cover. Label hoses for reinstallation. Remove any sensors or brackets attached to the timing cover.
   ⚠Coolant may still be warm. Allow engine to cool completely before draining coolant.
5. 5

   Remove timing cover bolts and front oil pan bolts
   Remove all timing cover bolts in the reverse of the tightening sequence. There are multiple bolt sizes (8mm and 10mm heads). Remove the front section oil pan bolts that connect to the timing cover. Note the location of different length bolts for reassembly.
   Torque spec

   Cover Bolts15 Nm (11 lb-ft)

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

   Remove timing cover
   Carefully pry the timing cover away from the engine block using plastic pry tools at designated pry points. Do not damage the mating surfaces. Remove the timing cover and gasket. Inspect the timing chain and guides for wear while cover is removed.
   ⚠Do not rotate the crankshaft with the timing cover removed unless absolutely necessary. If rotation is required, ensure you can verify correct valve timing before reassembly.
7. 7

   Remove front crankshaft seal
   Using a seal removal tool or seal puller, carefully extract the old front crankshaft seal from the timing cover. Take care not to damage the seal bore in the timing cover. If using a pry tool, work evenly around the seal to prevent cocking it in the bore. Clean the seal bore thoroughly with brake cleaner and inspect for damage or scoring.
8. 8

   Clean all mating surfaces
   Thoroughly clean all gasket mating surfaces on the timing cover, engine block, and oil pan using a razor blade scraper and brake cleaner. Remove all old gasket material and RTV sealant. Ensure surfaces are completely clean and dry before installing new gaskets. Clean the crankshaft snout with brake cleaner and inspect for scoring or damage that could cause the new seal to leak.
9. 9

   Install new front crankshaft seal
   Lightly coat the outer diameter of the new seal with clean engine oil. Apply a thin coat of oil to the seal lip as well. Using a seal installation tool or appropriately sized socket that contacts only the outer edge of the seal (not the center), carefully drive the seal squarely into the timing cover bore until it is fully seated and flush with the cover surface. Ensure the seal is not cocked or damaged during installation.
   ⚠If the seal is installed crooked or driven in too far, it must be replaced with a new seal. Never reuse a damaged seal.
10. 10

    Install timing cover gasket and apply sealant
    Install the new timing cover gasket onto the engine block. Apply a continuous bead of Toyota FIPG or equivalent RTV sealant to the timing cover at the junctions where the oil pan meets the engine block. Apply sealant to both sides of the gasket at these junction points. The bead should be approximately 3mm in diameter.
11. 11

    Install timing cover
    Carefully position the timing cover onto the engine block, ensuring the gasket stays in place and aligns properly with all bolt holes. Install all timing cover bolts finger-tight first. Tighten the 10mm timing cover bolts to specification in the proper sequence (typically from center outward), then tighten the 8mm bolts to specification in sequence. Install and torque the front oil pan bolts.
    ℹ️Allow RTV sealant to cure for at least 30 minutes before adding oil. Refer to sealant manufacturer instructions for full cure time.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)

    Oil Pan Bolts12 Nm (9 lb-ft)
12. 12

    Reinstall crankshaft pulley
    Clean the crankshaft snout and inspect the woodruff key is properly seated. Align the crankshaft pulley keyway with the key and slide the pulley onto the crankshaft. Install the crankshaft pulley bolt and tighten to specification using an impact wrench. If the bolt is torque-to-yield, replace with a new bolt per manufacturer specification.
    ℹ️Some service manuals specify this as a torque-to-yield bolt requiring replacement. Verify with Toyota service information for your specific model year.
    Torque spec

    Crankshaft Pulley Bolt180 Nm (133 lb-ft)
13. 13

    Reinstall engine mount and accessories
    Reinstall the right engine mount assembly, tightening all mounting bolts to specification. Reconnect all coolant hoses, sensors, and brackets removed earlier. Install the drive belt(s) onto the crankshaft pulley and ensure proper routing and tension.
    Torque spec

    Mounting Bolts26 Nm (19 lb-ft)

    Sensor Bolts10 Nm (8 lb-ft)

Reassembly

1. Reinstall engine under cover and splash shields
2. Reinstall right front wheel and torque lug nuts to specification
3. Lower vehicle from jack stands
4. Refill engine with correct amount and specification of fresh engine oil (4.5 quarts of Toyota Genuine 0W-20)
5. Top off coolant system with Toyota Super Long Life Pink coolant to proper level
6. Reconnect negative battery terminal
7. Bleed air from cooling system if necessary by running engine with radiator cap off until thermostat opens

Verification

• Start engine and immediately check for oil leaks around the timing cover and front crankshaft seal area
• Allow engine to reach operating temperature and verify no coolant leaks from timing cover area
• Check engine oil level after running and top off if necessary
• Inspect for oil leaks after the first 50 miles of driving
• Monitor oil consumption and check for leaks at first oil change interval
• Listen for any unusual noises from the timing chain area that could indicate improper reassembly

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