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Autopapyrus · Daewoo Gentra 1.5 B15D2 (2013)
https://autopapyrus.com/guides/daewoo/gentra/cylinder-head-gasket-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Daewoo Gentra 1.5 B15D2 (2013): Cylinder Head Gasket Replacement

Replacing the head gasket on the B15D2 engine is a labor-intensive job that requires removing the cylinder head. The engine has a chain-driven timing system, a cast-iron block, and shim-adjusted valve clearance. Use only the original metal GM gasket. Fiber-composite aftermarket gaskets are not reliable.

Difficulty: Hard Time: 6-8 hours Steps: 15 Tools: Wrench and socket set (10-22 mm), torque wrench (up to 100 N·m (74 lb-ft)), protractor or angle gauge for angle tightening, flat screwdriver, puller for removing accessories, container for draining coolant and oil, clean rags, solvent for cleaning surfaces

Part

  • 🔩 Cylinder head gasket 25192567 or 96990185 (GM, metal). Valve cover gasket 25182508. Exhaust manifold gasket. Cylinder head bolt set (10 pieces, must be new). Coolant (about 5-6 L (5.3-6.3 qt)), engine oil (about 3.75 L (4.0 qt))

Step by step

15 steps
  1. Disconnect the negative battery terminal. Drain the coolant through the radiator drain valve and the lower hose. Drain the engine oil through the oil pan drain plug.
  2. Remove the air filter assembly. Disconnect the cooling system hoses from the thermostat and the cylinder head. Unplug the sensor connectors (temperature, camshaft position, fuel injectors).
  3. Remove the intake and exhaust manifolds by unscrewing the mounting bolts. Remove the ignition coils and spark plugs.
  4. Remove the valve cover by unscrewing the bolts around its perimeter (the tightening torque for reinstallation is about 8 N·m (71 lb-in) for M6 bolts threaded into aluminum).
  5. Set the No. 1 cylinder piston to top dead center (TDC) using the marks on the crankshaft pulley and the timing chain cover. Lock the camshafts in position.
  6. Release the timing chain tensioner and take the chain off the camshaft sprockets. Do not let it fall into the crankcase (tie it up with wire).
  7. Unscrew the 10 cylinder head bolts in the reverse order of tightening (from the edges toward the center). Remove the head together with the camshafts and valve followers.
  8. Clean the mating surfaces of the head and block of any remaining old gasket material using solvent and a plastic scraper (not a metal one, which risks scratching). Check the head flatness with a straightedge (allowable warpage is up to 0.05 mm. If it is exceeded, the head must be machined).
  9. Place the new metal head gasket on the cylinder block (observe the orientation: the "UP" or "OBEN" mark must face up). Install the head.
  10. Install the new head bolts and tighten them in 4-5 stages from the center outward (the standard pattern for inline 4-cylinder engines): stage 1 - 20-25 N·m (15-18 lb-ft), stage 2 - turn an additional 60°, stage 3 - turn an additional 60°, stage 4 - turn an additional 60°, stage 5 - turn an additional 10° (use a protractor or marks on the wrench head). For exact values, refer to the manufacturer's specifications and check the GM service documentation.
  11. Install the timing chain on the camshaft sprockets, check that the marks line up, and tension the chain with the tensioner.
  12. Install the valve cover with a new gasket and tighten the bolts in a crisscross pattern to 8 N·m (71 lb-in).
  13. Install the intake and exhaust manifolds with new gaskets. Reconnect all sensors, the cooling hoses, and the air filter.
  14. Fill with fresh engine oil (3.75 L (4.0 qt)) and coolant, and bleed the air from the cooling system. Connect the battery.
  15. Start the engine and warm it up to operating temperature. Check for coolant and oil leaks. Check the fluid levels and top up if necessary.

Common mistakes and warnings

  • The cylinder head bolts are tightened using the torque-plus-angle method and are designed for single use. Reusing old bolts will lead to uneven clamping and combustion gas leakage. After replacing the gasket, it is recommended to recheck the bolt tightness after 500 km (about 300 miles). If you find foreign objects in the oil pan during disassembly (rags, shop towels) or signs of oil starvation, inspect the piston and connecting rod assembly and the crankshaft.
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