Replacing valve seats during head rebuild?
Head off my 1.6 HDi Peugeot for valve job- seats look pitted and recessed from old valves. Worth cutting new seats or just replace valves/seals and skim? Worried about compression drop.
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Levee House Bistro Group
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Pitted or sunk seats reduce compression and cause poor seating- better to recut or install new inserts if damage is deep. On common-rail HDi, seats wear from EGR soot and heat. I had seats recut but one was too far gone, so fitted new inserts. Sourced seat inserts (oversize) and matching valves from https://elartcom.eu/categories/cylinder-head-parts-123 - they have seat rings and full valve train parts for PSA diesels. Shop pressed in new seats, cut angles, lapped valves- compression back to spec, smooth idle, better power. Cheaper than new head and lasts longer. If your seats are salvageable, just three-angle cut; otherwise inserts are solid. Check their listings for your engine family- detailed options help get the right diameter/angle.