Genuine Mitsubishi Sigma Valve Spring

Mitsubishi Sigma Valve Spring Parts Questions & Experts Answers

• Valve Springs
  MD073398
  Q: What are the essential steps and considerations for removing and reinstalling engine components, particularly the Exhaust Valve, Intake Valve and Valve Spring on Mitsubishi Sigma?

  A:

  The vehicle must have the head removed from the engine or not run in the event of a head. To avoid mixing up the valves and components, which should be returned to their original positions, a system should be developed for storing and identifying them as they are removed, labeling them by position and application. Maintaining cleanliness of the work area and finding immediate storage will work fine. The appropriate special tools or their equivalents may be required to accomplish some procedures. Availability of other specialty tools, such as spring compressor, micrometer, reamer, etc., is doubtful. Early Mitsubishi engines such as the G15B, G32B, and G64B require the jet valve to be removed before the larger valves; use a special tool to avoid damaging the valve stem. Once the jet valve assembly is removed, a normal valve spring compressor should be fitted to compress the spring so that the valve spring retainers may be removed. Suitable cleaning, for carbon deposit removal, should be done at each valve. Inspection should be carried out for burning, distortion or corrosion. Extrusion Valve (extrusion) margin, I-section valve margin and spring height have been specified for various engine types. The squareness of valve springs should be checked and stem-to-guide clearance should be measured. The valve face and seat surfaces should contact across their whole surface. If necessary, the valve seat surfaces should be machined and lapped to achieve this. Jet valve service includes the dismantling of the assembly for inspection and the changing of the valve stem seal so that the valve will move smoothly upon installation. All parts must be cleaned and reinstalled in their original positions during reassembly. Special tools must be used for valve stem seals and spring seats to prevent oil consumption. The spring seat is placed, followed by inserting the valve. Then, the valve springs and keepers are fitted. The same fittings continue for each valve.