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Home›Repair guides›Valve Stem Seal Replacement

John Deere — Valve Stem Seal Replacement

A John Deere service procedure — check it applies to your exact model before use.

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Before you start

  • Always use a new seal after the intake/exhaust valve is disassembled. Since the one for the exhaust valve is marked with yellow paint, do not confuse the intake and exhaust valves.

Procedure

  1. Apply engine oil to the lip.
  2. Push with the inserting tool for installation.
  3. Measure and check the projection of valve stem seal to keep proper clearance between valve guide and stem seal.

Tools required

  • Valve stem seal inserting tool (No.5 of 4.1.2)

Specs & torque values

  • Valve stem seal projection (by model): 3TNV82A 15.7-16.0mm
  • 3TNV84(T)/4TNV84/88 18.7-19.0mm
  • 4TNV84T 9.9-10.2mm
  • 4TNV94L/98(T) 11.7-12.0mm
  • 4TNE106(T) 15.4-15.6mm

Source: manual:W484_Tier2+_Yanmar_3TNV_4TNV_series.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.