Volvo Penta D3 Front Belt Protector 30757900 | OEM Timing Cover

Part Information

• Part Number: 30757900
• Brand: Volvo Penta
• Official Product Type: Front Belt Protector — Timing Gear Housing
• Supersedes: No supersession on record
• Replaced By: No current supersession on record
• Diagram Position: Front position — Timing Gear / Toothed Belt Assembly (D3-H engine schematic)

Overview

The Volvo Penta 30757900 is the genuine OEM front belt protector for selected Volvo Penta D3-H marine diesel engines. It mounts at the front of the timing gear housing and shields the toothed timing belt, tensioner, and pulleys from debris, accidental contact, and external damage. Volvo Penta uses three separate position-specific covers on this timing assembly — front (30757900), rear (30757901), and lower (31293007) — so confirming the correct position before ordering is essential.

Compatible Applications

• Volvo Penta D3-110I-H
• Volvo Penta D3-140A-H / D3-140I-H
• Volvo Penta D3-150I-H
• Volvo Penta D3-170A-H / D3-170I-H
• Volvo Penta D3-200A-H / D3-200I-H
• Volvo Penta D3-220A-H / D3-220I-H

Fitment is specific to the D3-H generation. Confirm your complete engine model, generation suffix, and timing-gear-housing diagram before ordering.

Serial Number Requirements

Timing system components on Volvo Penta D3 engines can vary by generation and production break. Always confirm your engine model, generation suffix (e.g., -H), and serial number against the applicable Volvo Penta parts diagram before ordering.

System

Timing System — Toothed Belt / Timing Gear Housing

Related Parts — D3 Timing Belt Assembly

The following components are part of the D3 timing belt system and should be inspected whenever the belt protector is removed:

• Volvo Penta Rear Belt Protector 30757901
• Lower Belt Protector — 31293007
• Tooth Belt — 31359568
• Tooth Belt — 30777779
• Tensioner — 31339542
• Idler Pulley — 8692561
• Flange Screw — 987966 (used to mount this protector)

Dimensions & Weight

• Weight: Approximately 0.35 kg (estimated — see note below)
• Exact dimensions available via Volvo Penta D3 timing gear housing parts diagram

When This Part Needs Replacement

Replace the front belt protector if it is cracked, distorted, broken at the mounting points, or no longer securely covering the timing belt assembly. A damaged or missing cover leaves the belt, tensioner, and pulleys exposed to contamination and physical damage, which can shorten timing system service life significantly.

Technical FAQ

Q: What is the difference between 30757900, 30757901, and 31293007?
A: These are three separate position-specific covers for the D3 timing belt assembly — front, rear, and lower respectively. They are not interchangeable. Confirm which position you need before ordering.

Q: Do I need to replace the timing belt when replacing this cover?
A: Not necessarily, but since the timing area is exposed during cover removal, it is a good opportunity to inspect the belt, tensioner, and idler pulley for wear. If the belt is approaching its service interval, replacing it at the same time saves labor.

Q: How do I confirm this fits my D3 engine?
A: Match your engine model including the generation suffix (e.g., D3-170I-H) and confirm against the Volvo Penta timing gear housing diagram for your serial range.

Parts Desk Insights

The most common ordering mistake with this part is not specifying the position — front, rear, or lower. All three covers look similar and are close in price, but they are not interchangeable. If a customer isn’t sure which one they need, the quickest way to confirm is to pull up the D3 timing gear housing diagram for their specific engine suffix and serial range. It’s also worth noting that the existing weight on file (2 kg) appears to be a data entry error for a plastic timing cover — actual weight is estimated at approximately 0.35 kg.