Volvo Penta D3 Rear Belt Protector 30757901 | OEM Timing Cover

Part Information

• Part Number: 30757901
• Brand: Volvo Penta
• Official Product Type: Rear Belt Protector — Timing Gear Housing
• Supersedes: No supersession on record
• Replaced By: No current supersession on record
• Diagram Position: Rear position — Timing Gear / Toothed Belt Assembly (D3-H engine schematic)

Overview

The Volvo Penta 30757901 is the genuine OEM rear belt protector for selected Volvo Penta D3-H marine diesel engines. It mounts at the rear of the timing gear housing alongside the front and lower covers, protecting 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) — and they are not interchangeable.

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 Front Belt Protector 30757900
• Lower Belt Protector — 31293007
• Tooth Belt — 31359568
• Tooth Belt — 30777779
• Tensioner — 31339542
• Idler Pulley — 8692561
• Flange Screw — 987966

Dimensions & Weight

• Weight: Approximately 0.35 kg (estimated — previous value of 2 kg appears to be a data entry error)
• Exact dimensions available via Volvo Penta D3 timing gear housing parts diagram

When This Part Needs Replacement

Replace the rear belt protector if it is cracked, distorted, broken at the mounting points, or no longer providing secure clearance around the timing belt assembly. A damaged or missing cover leaves the belt, tensioner, and pulleys exposed to contamination and physical damage.

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: How do I identify which cover I need?
A: Pull up the Volvo Penta timing gear housing diagram for your specific D3-H engine model and serial range. Each cover is labeled by position in the schematic.

Q: Should I inspect the timing belt when replacing this cover?
A: Yes — since the timing area is exposed during cover removal, it is a good opportunity to inspect the belt, tensioner, and idler pulley. If the belt is approaching its service interval, replacing it at the same time saves labor.

Parts Desk Insights

The most common issue with this part is customers ordering the wrong cover — front, rear, and lower all look similar and are close in price, but they are position-specific and not interchangeable. The quickest way to confirm which one is needed is to reference the D3 timing gear housing diagram for the customer’s specific engine suffix and serial range. Also worth noting: the 2 kg weight on file appears to be a data entry error for a plastic timing cover — actual weight is estimated at approximately 0.35 kg.