Yanmar — Intake/exhaust valve clearance adjustment
Adjustments · Cylinder head
From a Yanmar service manual — check it applies to your exact model before use.
Browse Yanmar generators & specs →
Procedure
- Make measurement and adjustment while the engine is cold
- Remove the rocker arm cover above cylinder head
- Set the No.1 cylinder in the compression TDC
- Insert thickness gage between rocker arm and valve cap (2-valve) or valve bridge (4-valve)
- Loosen lock nut and adjusting screw and record measured valve clearance
- Adjust the adjusting screw to the standard valve clearance and tighten
- Apply oil to contact surface between adjusting screw and push rod
- Adjust other cylinders in the order of ignition turning crankshaft 180 (4-cyl) or 240 (3-cyl)
Tools required
- Thickness gage Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 3TNV82A eBay $12.99 FridayParts $9.80 SinoCMP $99.00~98 valve clearance: 0.15~0.25 mm
- 4TNV106 Amazon eBay $179.95 FridayParts $8.50 SinoCMP $129.00(T) valve clearance: 0.25~0.35 mm
Source: Yanmar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.