Volvo Penta — Checking the marking pattern and gear flank clearance (gear housing)

Adjustments · Gear housing / input bearing housing

From a Volvo Penta service manual — check it applies to your exact model before use.

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Procedure

1. Try installing an 0.40 mm shim in the input bearing housing and install it.
2. Put the vertical shaft with needle roller bearing in the housing.
3. Measure the gear flank clearance on both gear wheels with dial gauge 9999683, pressing the gear wheel down.
4. Add shims to the input bearing housing if clearance is not enough; reduce shim thickness if too great.
5. Turn the housing upside down and repeat for the other gear wheel.
6. Apply marking dye and turn the input shaft in engine rotation direction, braking with tool 884738.
7. Check that the pattern corresponds with pattern A (correct).
8. If pattern is like B, reduce shim thickness in the input bearing housing.
9. If pattern is like C, move the input gear housing and gear wheel in opposite directions.

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.

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