EXHAUST VALVE FOR JOHN DEERE R43679

The John Deere exhaust valve, part number R43679, is an engine part designed for several tractors in the 20, 30, 40, and 50 series. It is identified primarily by its key dimensions: 43.5 mm, 9.5 mm, and 156 mm, with a specified angle of 45°. These measurements are useful for confirming a proper fit before installing the part on your agricultural engine.

An exhaust valve for the engine

This part number corresponds to an exhaust valve, not an intake valve. Its general function is to ensure the opening necessary for expelling combustion gases from the combustion chamber, in coordination with the rest of the valve train. For this type of part, precise dimensions are essential to ensure compatibility with the equipment already installed on the engine.

When a valve has a worn seat, a worn stem, or is deformed, replacement requires careful verification. The selection is not based solely on the tractor model: the part number and dimensions remain the primary selection criteria.

Dimensions to Check to Verify the Part Number

For this valve, the provided measurements are as follows:

• A: 43.5 mm
• B: 9.5 mm
• L: 156 mm
• D: 45°

These values are used to compare the part with the removed valve. They correspond to key reference points for selecting the correct part number: head diameter, stem diameter, total length, and seat angle. A discrepancy in any of these dimensions may indicate a different version, even if the tractor belongs to a related series.

Part number R43679 is therefore a useful second point of reference, in addition to the dimensions measured on the old part.

John Deere Applications to Check Carefully

This valve is used in several John Deere tractors, with models spanning the 20, 30, 40, and 50 series. These include, in particular, models such as the 3020, 4000, 4020, 4230, 4040 (U.S.), 4240 (Europe), and 4050 (6466D), as well as other variants specified by series.

With this type of application, it is important to pay close attention to market differences and serial number thresholds. The designations “USA” or “Europe” or the serial number prefixes associated with certain models help distinguish between configurations that are not necessarily identical despite having similar designations.

Choose Carefully Before Reinstallation

Before ordering, compare the valve currently installed with the listed dimensions and confirm the exact model designation of the tractor. If your machine matches one of the listed applications and the dimensions match, this R43679 exhaust valve is the correct replacement. If you’re unsure between two variants, checking the measurements remains the most direct way to select the correct part.

Dimensions and Technical Specifications

• 43.5 mm
• 9.5 mm
• 156 mm

Compatibility by Brand and Series

JOHN DEERE · 20 Series

• 3020 (123000 and up)
• 4000
• 4020 (201000 and up)
• 4320
• 4520
• 4,620
• 7020 (=>335,845)

JOHN DEERE · 30 Series

• 4230

JOHN DEERE · 40 Series

• 4040 (USA)
• 4240 (Europe)

JOHN DEERE · 50 Series

• 4050 (6466D)
• D 45°

FAQ — Frequently Asked Questions

What is the purpose of this exhaust valve on a John Deere engine?

This exhaust valve allows exhaust gases to be expelled from the cylinder. On a tractor engine, it is part of the valve train and must have the correct dimensions to be compatible with the existing assembly, particularly the length, stem diameter, and seat angle.

How do I identify part number R43679 before ordering?

The safest approach is to compare part number R43679 with the removed part and verify the key dimensions. This valve is identified by the measurements 43.5 mm, 9.5 mm, and 156 mm, with an angle specified as 45°. Also verify the exact model designation of the tractor and, if necessary, its serial number.

Is this valve compatible with the John Deere 3020, 4020, 4040 (U.S.), and 4240 (Europe)?

Yes, these models are listed among the applications for this part number. However, you must follow the specific instructions for certain models, such as the serial number ranges for the 3020 and 4020, as well as the market-specific notes for the 4040 (U.S.) and 4240 (Europe).

Why does the 45° angle need to be verified?

The 45° specification is used to verify the valve’s stroke. This value must match the existing installation and the part you are replacing. Even if the tractor is listed among the specified applications, this angle remains a useful reference to avoid selection errors.

Original replacement part numbers and brand names are provided for comparison purposes only. This does not imply that these are original parts.