Yanmar — Installation of Timing Belt
Installation
From a Yanmar service manual — check it applies to your exact model before use.
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Before you start
- Install when the engine is cooled down
Procedure
- Install the set key and press in No.1 camshaft timing pulley, temporarily tighten pulley bolt, then tighten to torque.
- Install the bonnet with new seal washers and bolts.
- Align knock pins and install No.1 flange, timing pulley and No.2 flange using four bolts.
- Install the plate washer and idler pulley by the pivot bolt using an 8 mm hexagon wrench.
- Set No.1 cylinder to bottom dead center (BDC) aligning timing marks.
- Install the timing belt aligning removal marks and arrow to engine revolution direction.
- Install the tension spring (6LP-DTE) or timing belt tensioner (6LP-STE).
- Turn crankshaft pulley clockwise to check each pulley timing mark matches TDC mark.
- Install the timing belt cover.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- No.1 camshaft timing pulley bolt 1000 kgf-cm (98.00 N-m)
- No.2 camshaft timing pulley bolts 315 kgf-cm (30.87 N-m)
- Idler pulley 270 kgf-cm (26.48 N-m) DTE, 350 kgf-cm (34.32 N-m) STE
- Timing belt tensioner 130 kgf-cm (12.74 N-m)
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.