Yanmar 4TNE88 — Replacing the valve guide
Repair & overhaul
For the Yanmar 4TNE88, from the Yanmar service manual.
Applies to: Yanmar 4TNE88, Yanmar TNE series engine
Procedure
- Extract the valve guide from the cylinder head using the valve guide extraction tool.
- Cool the valve guide in liquefied nitrogen, ether or alcohol with dry ice.
- Hit the sufficiently cooled valve guide to fit into the cylinder head using the insertion tool.
- Finish the inside of the valve guide with a reamer.
- Check the projection of the valve guide.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve guide projection per model
Full service-parts list: Yanmar 4TNE88 →
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.