Volvo Penta — Flywheel ring gear, changing
Repair & overhaul · Flywheel ring gear (21687)
From a Volvo Penta service manual covering: TAD530GE, TAD531GE, TAD532GE, TAD722GE, TAD730G, TAD732GE, TAD733GE, TD520GE, TD720GE, tAd731GE. Check it applies to your exact model before use.
Applies to: Volvo Penta TAD530GE, Volvo Penta TAD531GE, Volvo Penta TAD532GE, Volvo Penta TAD722GE, Volvo Penta TAD730G, Volvo Penta TAD732GE, Volvo Penta TAD733GE, Volvo Penta TD520GE, Volvo Penta TD720GE, Volvo Penta tAd731GE
Before you start
- Be careful not to drill into the flywheel, or it will lose its balance.
Procedure
- Heat the new ring gear to max 210 °C using an oven or gas torch.
- Drill a hole between two teeth, 10 mm drill, 9 mm deep.
- Remove the old ring gear; hold it in a soft-faced vice and pry it off, splitting it if necessary.
- Clean the contact surfaces of the flywheel.
- Check the temperature and position the ring gear so that it meets the flywheel flange.
- Tap the ring gear down to the bottom using a brass drift and let it cool.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Ring gear heating: max 210 °C (410 °F)
- Drill 10 mm, 9 mm deep
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.