Volvo Penta — Valve seat, changing
Repair & overhaul · valve seats
From a Volvo Penta service manual — check it applies to your exact model before use.
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Before you start
- Carefully cover other parts of cylinder head to prevent welding spatter.
Procedure
- Change valve seats when distance A with new valve exceeds specification.
- Grind old valve head to sit 1-3 mm lower in seat.
- Weld old valve to valve seat with four spot welds.
- Tap out valve seat.
- Clean seat and examine cylinder head for cracks.
- Measure seat position diameter; use standard or oversize seat.
- Chill seat in dry ice to -60°C to -70°C and heat cylinder head.
- Press valve seat into place using drift.
- Machine seat to correct angle and width.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Inlet height 8.4-8.6 mm
- Exhaust height 7.9-8.1 mm
- Standard outer 43.1 mm
- Oversize outer 43.3 mm
- Inlet (D12D) 7.15-7.35 mm
Source: Volvo Penta 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.