# 20405535 O-Ring | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta O-ring used around charge-air and inlet-pipe adapter 20405944. One or two O-rings are used according to the inlet or charge-air cooler arrangement.

## 🚤 Compatibility

-   **Engine Family:** D, TD, TAD

Full model list at the end of this description.

## ⚙️ Key Features

-   Heat- and oil-mist-resistant charge-air seal
-   Used with adapter 20405944
-   One or two fitted according to the engine arrangement
-   Seals pressurised intake air between the pipe and adapter
-   Should be lubricated and renewed whenever the joint is separated
-   Engine type: Volvo Penta 5- and 7-litre turbocharged industrial diesel
-   Quantity varies by assembly, most commonly two

## 🔌 Function

Seals the charge-air adapter so compressed intake air reaches the inlet manifold without boost leakage.

## ⚠️ Common Signs of Failure

-   Boost-air hiss or whistle
-   Oil mist around the adapter joint
-   Increased black smoke
-   O-ring cut, flattened or extruded

## 🛠️ 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 Supersession Chain

-   20405535 → Supersedes 20451014

### OEM / Related Numbers

-   20460317 earlier number superseded by this part
-   20460316 earlier number superseded by this part
-   20405944 - related charge-air pipe adapter
-   21664162 - related charge-air pipes in later arrangements
-   21664145 - related charge-air pipes in later arrangements
-   20405536 - related inlet tube sealing ring

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
-   Volvo Penta TAD720GE, TAD720VE
-   Volvo Penta TAD721GE, TAD721VE
-   Volvo Penta TAD722GE, TAD722VE
-   Volvo Penta TAD730GE MECH, TAD730GE EDC4
-   Volvo Penta TAD731GE MECH, TAD731GE EDC4
-   Volvo Penta TD720GE, TD720VE PP
-   Volvo Penta D5A-T
-   Volvo Penta TAD650VE
-   Volvo Penta TAD660VE
-   Volvo Penta TAD732GE EDC4
-   Volvo Penta TAD733GE EDC4
-   Volvo Penta TAD734GE
-   Volvo Penta TAD750VE
-   Volvo Penta TAD752GE
-   Volvo Penta TAD753GE
-   Volvo Penta TAD754GE
-   Volvo Penta TAD760VE
-   Volvo Penta TD520VE

## Details

- **Price:** 33.0 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 33.00 AUD | In stock |

## Images

- 20405535 O-Ring | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20405535-o-ring-genuine-volvo-penta)
> Updated: 2026-08-22