Genuine Nissan Exhaust Valve

Nissan Pathfinder Exhaust Valve Parts Questions & Experts Answers

• Q: How to service the Exhaust Valve and Intake Valve, including valve seats and valve guides, on Nissan Pathfinder?

  A: Due to the intricate nature of the task and the specific tools and equipment required, a professional should handle the servicing of the valves, valve seats, and valve guides, also known as a valve job. A home mechanic can undertake the removal and disassembly of the heads, perform the initial cleaning and inspection, then reassemble and deliver them to an automotive machine shop for the actual service work. This inspection allows the mechanic to understand the condition of the cylinder head and valve train components and to know what work and new parts are needed when dealing with an automotive machine shop. The machine shop will then remove the valves and springs, recondition or replace the valves and valve seats, recondition or replace the valve guides, check and replace the valve springs, spring retainers and valve stem keepers (as necessary), replace the valve seals with new ones, reassemble the valve components and ensure the installed spring height is correct. The cylinder head gasket surface will also be resurfaced if it's warped. After the valve job has been professionally done, the cylinder head will be in a like-new condition. When the cylinder head is returned, it should be cleaned again before installation on the engine to remove any metal particles and abrasive grit that may still be present from the valve service or cylinder head resurfacing operations. Compressed air should be used, if available, to blow out all the oil holes and passages.