# 20510747 Valve Cotter | Genuine Volvo Penta Part

## 🔧 Product Description

This genuine Volvo Penta valve cotter is an OEM service component used in the Valve Cotter / Collet. It is manufactured to the original Volvo Penta dimensional, material and interface requirements for the documented Volvo Penta 9-litre TAD9 and 11-litre D11/TAD11 diesel application. Technical identification: Split valve cotter that locks the spring retainer to the valve stem; replace as a matched pair. In service, it locks the valve spring retainer to the valve-stem groove so spring load is safely retained. Selection must be confirmed by OEM part number 20510747, the exact model/product number, serial number and installed assembly configuration.

## 🚤 Compatibility

-   **Engine Family:** TAD, D

Full model list at the end of this description.

## ⚙️ Key Features

-   Genuine Volvo Penta OEM valve cotter
-   OEM part number 20510747
-   Technical distinction: Split valve cotter that locks the spring retainer to the valve stem; replace as a matched pair
-   Also supersedes Volvo part numbers 20516141, 3809943, 3836280, 3836281 and 3837495

## 🔌 Function

Locks the valve spring retainer to the valve-stem groove so spring load is safely retained. Inspect all matched valve-train parts, lubricate contact surfaces, set valve recession/clearance where applicable and recheck after initial operation.

## ⚠️ Common Signs of Failure

-   Excessive valve-train ticking or changing valve clearance
-   Low compression, misfire or poor starting
-   Uneven valve movement or load sharing
-   Pitted, cracked, worn or distorted contact surfaces
-   Valve, spring or rocker damage caused by incorrect adjustment/retention

## 🛠️ Service Notes

-   Fit cotters as a matched pair from the same new set and never mix a used half with a new one, since the two halves wear together to the stem groove
-   Check both halves are properly engaged in the groove in the valve stem before you release the spring compressor, and release it slowly while watching them
-   With the compressor removed, tap the end of the valve stem squarely to settle the cotters and confirm they hold — a cotter that has not seated will let go once the engine runs
-   Renew the cotters and inspect the stem groove and the spring retainer for wear whenever the head is stripped; worn cotters or a worn groove let the valve drop into the cylinder
-   Keep the parts scrupulously clean and free of oil on the mating faces during assembly so the taper can grip as intended

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   20510747 → Supersedes 20528111

### OEM / Related Numbers

-   20510743 valve-spring retainer washer

### Other-Brand OEM Numbers

-   Deutz 02108102
-   Deutz 01179938
-   TRW Engine Component: MK-8H

### Aftermarket / Verified Equivalents

-   FEBI Bilstein: 03161
-   SWAG: 32 90 3161
-   Interstate-McBee: replacement for Volvo/Mack D11-D13 valve cotter
-   DT Spare Parts: 2.10550
-   Sampa: 037.220
-   SLP: VKN-747
-   Orbitrade: 13643

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D13C1-A MP, D13C2-A MP, D13C3-A MP, D13C4-A MP, D13B-A MP, D13B-H MP, D13B-G MP, D13B-L MP, D13B-E MG, D13B-E MG (FE), D13B-E MH, D13B-E MH (FE), D13B-F MG, D13B-F MG (FE), D13B-K MP, D13B-N MH, D13B-N MH (FE), D13B-B MP, D13B-D MP, D13B-J MP, D13B-M MP, D13B-C MP, D13C5-B MP, D13C6-A MP, D13C1-A MH, D13C2-A MH, D13C5-A MP, D13C2-A MG, D13C1-A MG
-   Volvo Penta D11B3-A MP, D11B4-A MP, D11A-A, D11A-B, D11A-C, D11A-E, D11B2-A MP, D11A-C MP, D11A-D MP, D11A-E MP, D11A-C (IPS), D11B1-A MP
-   Volvo Penta D9A2J, D9A2G, D9A2L MH, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2M MP, D9A2A, D9A2C, D9A2E
-   Volvo Penta TAD1341-43GE-B, TAD1341VE, TAD1341GE
-   Volvo Penta TAD1344-45GE-B, TAD1344VE, TAD1344GE
-   Volvo Penta TAD1342VE, TAD1342GE
-   Volvo Penta TAD1343VE, TAD1343GE
-   Volvo Penta TAD1345GE, TAD1345VE
-   Volvo Penta TAD1350GE, TAD1350VE
-   Volvo Penta TAD1351GE, TAD1351-53VE
-   Volvo Penta TAD940GE, TAD940VE
-   Volvo Penta TAD941VE, TAD941GE
-   Volvo Penta TAD1140-42VE
-   Volvo Penta TAD1150-52VE
-   Volvo Penta TAD1170-72VE
-   Volvo Penta TAD1180-83VE
-   Volvo Penta TAD1340VE
-   Volvo Penta TAD1346GE
-   Volvo Penta TAD1352GE
-   Volvo Penta TAD1353GE
-   Volvo Penta TAD1354GE
-   Volvo Penta TAD1355GE
-   Volvo Penta TAD1360-62VE
-   Volvo Penta TAD1363-65VE
-   Volvo Penta TAD1371-75VE
-   Volvo Penta TAD1380-82GE
-   Volvo Penta TAD1381-85VE
-   Volvo Penta TAD1384-85VE-IWP
-   Volvo Penta TAD942VE
-   Volvo Penta TAD943VE
-   Volvo Penta TAD950VE
-   Volvo Penta TAD951VE
-   Volvo Penta TAD952VE

## Details

- **Price:** 3.47 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3.47 AUD | In stock |

## Images

- 20510747 Valve Cotter | Genuine Volvo Penta Part
- 20510747 Valve Cotter | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20510747-valve-cotter-genuine-volvo-penta)
> Updated: 2026-10-12