Specification 4.0L (Discovery 3)

Recommended lubricants

Name	Specification
Heated oxygen sensor thread	Use a heat-resistant compound to prevent seizing.

General technical characteristics

Name	Specification
Exhaust manifolds	Metal, with air gap and exhaust gas recirculation (EGR) pipe on the left manifold
Exhaust system	Dual stainless steel exhaust pipes with stainless steel mufflers
Catalytic Converters - Type/Location	Closed cascade - located in each pipe with gas passage from top to bottom with sensors before and after the neutralizer in each pipe

Tightening torque specifications

Name	Nm	lb-ft
** HO2S	45	33
Catalytic Converter Mounting Clamp	55	40
Catalytic converter to muffler mounting nut with mounting clamp	48	35
Exhaust pipe	55	40
* Bolts securing the catalytic converter to the exhaust manifold	22	16

* New bolts must be installed
** Apply a suitable heat-resistant anti-seize compound

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