Parts for your 2018 Nissan Serena-Head gasket

2018 Nissan Serena head gasket — what it does and when to sort it

Yes, the 2018 Nissan Serena uses a head gasket. Technical references that specify it include Nissan’s C27 Serena Electronic Service Manual (ESM) — Engine Mechanical sections for the MR20DD 2.0‑litre S-HYBRID and the HR12DE generator engine used in the e‑POWER — where the exploded views and torque procedures list a “Cylinder Head Gasket” and torque‑to‑yield head bolts. Nissan’s FAST electronic parts catalogue also carries dedicated head‑gasket part listings for these engines. So the head gasket is absolutely relevant to every 2018 Serena variant.

On the Serena’s alloy block and alloy DOHC head, the multi‑layer steel head gasket seals three critical circuits between block and head: high‑pressure combustion, engine oil, and coolant. It keeps compression tight for efficient burn, prevents coolant or oil from sneaking into cylinders, and stops external leaks. When it’s healthy, the van runs quietly, pulls cleanly, and stays cool — whether it’s the MR20DD driving the wheels (S‑HYBRID) or the HR12DE cycling on as a generator in the e‑POWER.

The head gasket isn’t a routine “service item”, but good servicing massively reduces risk. Keep the cooling system spot‑on: fresh Nissan‑spec long‑life coolant at the correct mix, no air pockets after coolant changes, radiator and cap in good nick, electric fans operating, and no leaks from hoses or the water pump. Avoid overheating — even one big overheat can warp the head and pinch the gasket.

Watch for early tell‑tales of trouble:

• Unexplained coolant loss, bubbles in the reservoir, or pressure building from cold
• Overheating under load or on hills, heater going cold
• White steam from the exhaust, sweet smell, rough cold starts or misfire
• Milky residue on the oil cap or dipstick, or oily film in the coolant

If replacement’s needed, it’s a precision job: head off, surfaces cleaned and measured for flatness, head pressure‑tested, new multi‑layer steel gasket fitted, and new torque‑to‑yield head bolts tightened by the book (torque + angle). It’s smart to replace the thermostat, renew coolant and engine oil/filter, and consider the water pump if it’s due. A competent workshop will also bleed the cooling system correctly to protect the fresh seal. Budget for the van to be off the road for at least a full day, sometimes two, depending on machine work.

Popular questions

Does the 2018 Nissan Serena (including e‑POWER) have a head gasket?
Yes. Nissan’s C27 Serena ESM lists a cylinder head gasket in the Engine Mechanical sections for both MR20DD and HR12DE engines, and the FAST parts catalogue provides specific gasket part listings. Every 2018 Serena variant uses one.

What are common signs the Serena’s head gasket is failing?
Typical clues include coolant loss with no obvious leak, overheating, bubbles in the overflow, white exhaust steam, rough cold starts, and milky oil. Any of these warrant a cooling‑system pressure test and a combustion‑gas test at the radiator.

Can a bottled sealant fix a Serena head‑gasket leak?
Sealants are, at best, a temporary band‑aid and can clog heater cores or radiators. For a reliable fix, the correct repair is gasket replacement with head inspection and proper torque procedures.