Yanmar 4TNE88 — Reassembly precautions
Repair & overhaul · Engine
For the Yanmar 4TNE88, from the Yanmar service manual.
Applies to: Yanmar 4TNE88, Yanmar TNE series engine
Before you start
- Apply liquid packing so as not to form any break on the midway, otherwise oil leakage may result.
Procedure
- Clean the cylinder block, cylinder head, crankshaft and camshaft free from chips, dust, sand and foreign matter.
- Replace required parts with new ones (valve stem seal, head gasket packing, nozzle protector, copper packings, O-rings and gasket packings).
- Measure the side gap around the crankshaft; replace thrust metal if limit is exceeded.
- After installing each gear, make sure the marks of the idle gear align with the fuel injection pump drive gear, camshaft gear and crankshaft gear.
- Apply liquid packing Three Bond No. 005 at the specified joints without breaks.
- Tighten cylinder heads in numerical order shown to the specified torque; carry out confirmation running for leakage.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Crankshaft side gap 0.090~0.271 mm
- Cylinder head tightening torque 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.