# 21670186 O-Ring | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine elastomer O-ring used in the TAD550GE fuel-regulator and overflow-valve assembly. O-ring 21670186 has a position-specific diameter and cross-section and must not be substituted with the adjacent seal.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD550GE
-   Volvo Penta TAD551GE
-   Volvo Penta TAD560VE
-   Volvo Penta TAD561VE
-   Volvo Penta TAD734GE
-   Volvo Penta TAD750GE
-   Volvo Penta TAD751GE
-   Volvo Penta TAD752GE
-   Volvo Penta TAD753GE
-   Volvo Penta TAD754GE
-   Volvo Penta TAD765VE
-   Volvo Penta TAD764VE
-   Volvo Penta TAD763VE
-   Volvo Penta TAD762VE
-   Volvo Penta TAD761VE

-   **Engine Family:** TAD
-   **Year Range:** Approximately 2008 - 2020

## ⚙️ Key Features

-   Genuine Volvo Penta fuel-system O-ring
-   Position-specific size and material
-   Compatible with diesel fuel
-   Maintains regulator and valve sealing
-   Engine type: 5.1L inline four-cylinder or 7.15L inline six-cylinder turbocharged generator diesel

## 🔌 Function

Seals the specified fuel-regulator or overflow-valve joint and prevents fuel leakage or air entry.

## ⚠️ Common Signs of Failure

-   Diesel seepage
-   Air entering the fuel circuit
-   Flattening, cuts or swelling
-   Recurring leakage from a damaged groove

## 🛠️ Service Notes

-   Always fit a new O-ring — never refit one that has been removed, as it has already taken a set in its groove
-   Clean the groove and both sealing faces and check them for nicks, scoring and corrosion pitting; a damaged groove will leak however good the new seal is
-   Smear the ring with a little clean lubricant compatible with the fluid it seals, then roll it into place by hand so it sits untwisted and fully in its groove
-   Never lever an O-ring over a sharp edge or thread with a screwdriver; use a blunt plastic tool and protect any edge the ring has to pass
-   Assemble the joint squarely and tighten to the figure and sequence given in the workshop manual for your engine — over-tightening extrudes the ring and causes the very leak you were curing

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   21638691 - fuel regulator
-   21670181 - overflow valve
-   21670190 - associated O-ring
-   21738263 - solenoid valve

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 3.49 AUD
- **Vendor:** Volvo Penta
- **Type:** Gaskets & Seals
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3.49 AUD | In stock |

## Images

- 21670186 O-Ring | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21670186-o-ring-genuine-volvo-penta)
> Updated: 2026-09-06