Autopapyrus · Hyundai Grandeur 3.0 G6DE (2012)
https://autopapyrus.com/guides/hyundai/grandeur/valve-train-check-and-fixing-valve-noise/

Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Hyundai Grandeur 3.0 G6DE (2012): Valve Train Check and Fixing Valve Noise

The G6DE engine (3.0 L V6, Lambda series, timing chain drive, dual CVVT) is reportedly equipped with hydraulic lash adjusters, so it has no traditional mileage-based valve adjustment with shims or screws. If a knocking or ticking noise appears, it needs diagnosis: oil, oil pressure, hydraulic lash adjusters, and variable valve timing (CVVT) phasers. The exact procedure and clearance specifications for this model are not documented in publicly available service materials, so the general approach is given below. Check the details against the manufacturer's service manual.

Difficulty: Medium Time: 1-2 hours (diagnosis); replacing hydraulic lash adjusters takes 4 hours or more Steps: 8 Tools: Socket set and ratchet, torque wrench, Torx sockets, mechanic's stethoscope or a long screwdriver, feeler gauge (for checking), RTV sealant for valve covers, oil drain pan

Part

🔩 If needed: hydraulic lash adjusters (hydraulic valve lifters), valve cover gasket set, engine oil and oil filter. Lash adjuster prices: check with your parts supplier

There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online). See manuals →

Step by step

8 steps

Check the oil level and condition. A low oil level, or oil that is too old or the wrong viscosity, is the most common cause of lash adjuster noise. Top up or change the oil and filter, and use oil that meets the manufacturer's specification.
Warm the engine up to operating temperature and listen for the noise at idle. A noise that goes away 1-2 minutes after a cold start usually just means the lash adjusters are slow to fill with oil. This is acceptable.
Use a stethoscope to locate the bank (left or right) and the spot where the noise comes from. An even ticking across the whole engine points to oil or oil pressure. A knock from a single valve points to a specific lash adjuster or a worn cam lobe.
If you suspect low oil pressure, check the oil pressure and the condition of the oil pump. If the oil pressure light comes on with a warm engine, stop the engine immediately.
If the noise persists, remove the valve covers from both cylinder heads. Remove the engine cover, the air intake duct, the ignition coils, and the connectors from the injectors and sensors, and move the wiring harnesses aside if needed. Be sure to mark the position of each connector.
Inspect the camshaft lobes and rocker arms for scoring and wear. Check the lash adjuster's movement: a good one should not collapse under hand pressure when the valve is closed. Replace defective lash adjusters or rocker arms only after checking the neighboring ones as well.
Install the covers with new gaskets. Take the torque values for the valve cover bolts and ignition coil bolts from the manufacturer's service manual. Tighten evenly in a spiral pattern from the center outward, without over-compressing the gaskets.
Warm up the engine, check for oil leaks, and take a test drive. If the noise remains after changing the oil and filter and it seems to come from the area of the timing chain and phasers, also check the timing chains, tensioners, and CVVT couplings.

Common mistakes and warnings

Do not try to "adjust" the clearances using procedures from other Hyundai engines with mechanical (solid) lifters. No such procedure exists for hydraulic lash adjusters, and attempting it will damage parts. If you have no experience, it is better to leave work that involves removing the covers and the timing system to a repair shop. A knock accompanied by low oil pressure requires stopping the engine immediately.