Head Gasket Failure
Symptoms
Coolant loss, white smoke from the exhaust, overheating, milky oil, and/or combustion gases in the coolant (detectable with a block tester).
Cause
The factory multi-layer steel (MLS) head gasket is adequate for stock boost levels (0.55-0.7 bar) but is the first point of failure when boost is increased. The RB26's long, slender head is prone to lifting between cylinders under high boost, which breaks the gasket seal. Even on stock cars, age and thermal cycling can cause the gasket to fail after 200,000+ km.
Fix
Replace the head gasket.
On a stock engine, a genuine Nissan MLS gasket is adequate.
On a modified engine (above 1.0 bar boost), an aftermarket metal gasket (Tomei, HKS) with head studs (replacing the factory bolts) is required.
The head must be checked for flatness and machined if necessary.
Cost: $1,500-3,000 all-in for a stock replacement, $3,000-5,000 for an upgraded gasket with studs.
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