Volvo Penta D3 Piston Ring Kit 30731740 | STD OEM Engine Rebuild

Part Information

• Part Number: 30731740
• Brand: Volvo Penta
• Official Product Type: Piston Ring Kit Standard Size (STD)
• Supersedes: No supersession on record
• Replaced By: No current supersession on record
• Diagram Position: Object key 31 Crankshaft, Connecting Rod & Piston Assembly (D3-110I-A schematic)

Overview

The Volvo Penta 30731740 is a genuine OEM standard-size (STD) piston ring kit for early Volvo Penta D3 marine diesel engines. It is the factory-specified ring set for engines within the early D3 serial range and is used during piston service or engine rebuild work where the cylinders remain at standard bore. Correct ring selection is critical to restoring compression, controlling oil consumption, and ensuring long-term engine reliability after internal service.

Compatible Applications

• Volvo Penta D3-110I-A
• Volvo Penta D3-110I-B
• Volvo Penta D3-110I-C
• Volvo Penta D3-130A-A / D3-130I-A
• Volvo Penta D3-130A-B / D3-130I-B
• Volvo Penta D3-130A-C / D3-130I-C
• Volvo Penta D3-160A-A / D3-160I-A
• Volvo Penta D3-160A-B / D3-160I-B
• Volvo Penta D3-160A-C / D3-160I-C
• Volvo Penta D3-190A-B / D3-190I-B
• Volvo Penta D3-190A-C / D3-190I-C

Serial coverage: early D3 engines up to and including serial number 2003004563. Piston ring specifications can vary by serial break and bore size always confirm against your engine serial number and the applicable Volvo Penta parts diagram before ordering.

Serial Number Requirements

This kit is documented for early D3 engines up to serial number 2003004563. Serial verification is especially important here engines that have had prior internal machining or piston replacement may require an oversize ring kit rather than STD. Always confirm bore size and serial range before ordering.

System

Engine Internal Crankshaft, Connecting Rod & Piston Assembly

Dimensions & Weight

• Weight: Approximately 0.054 kg
• Ring dimensions per Volvo Penta D3 engine specifications confirm via parts diagram for your serial range

When This Part Needs Replacement

Piston rings are replaced during engine rebuild or piston service, typically when the engine shows signs of worn rings: low compression, increased oil consumption, excessive blow-by, or cylinder-related wear identified during inspection. This is an internal engine service part, not a routine maintenance item.

Technical FAQ

Q: What does STD mean for piston rings?
A: STD (standard size) means the rings are sized for a cylinder bore that has not been machined oversize. If the engine has been bored or honed beyond factory spec, an oversize ring kit is required instead.

Q: How do I confirm this kit fits my D3 engine?
A: Match your engine model and serial number to the documented range (up to serial 2003004563), and confirm the cylinder bore is still at standard size. Cross-reference with the Volvo Penta D3 parts diagram for your specific engine variant.

Q: Is RM30731740 the same part?
A: RM30731740 is an aftermarket cross-reference number, not a Volvo Penta supersession. 30731740 remains the current active OEM part number.

Q: What other components should I inspect during piston ring service?
A: During ring replacement, inspect cylinder walls for scoring or wear, check piston condition, and assess connecting rod bearings and crankshaft journals. Replacing rings in a worn or damaged bore will not restore full engine performance.

Parts Desk Insights

The most common issue with piston ring orders on D3 engines is skipping the serial number check or assuming the bore is still standard. If the engine has had any prior internal work, there’s a real chance it’s been bored oversize and installing STD rings in an oversize bore won’t seal properly. It’s worth confirming bore size before the engine comes apart, not after. This is also a part where getting the right kit the first time matters, since a rebuild delay waiting on parts is far more costly than a quick verification call before ordering.