The Wacker Neuson Valve Stem Seal is a genuine OEM component designed for the HIF 690 Flameless Air Heater series. Sourced directly from Wacker Neuson, this seal carries the same material grade and dimensional spec as the part originally installed at the factory, so you can be confident it will seat and compress correctly on installation. Compatible with both the standard HIF 690 Flameless Air Heater and the Kubota Engine-equipped HIF 690 Flameless Heater variants, the is the correct replacement for this application.
Key Features
- OEM-Grade Seal Material — Manufactured to Wacker Neuson's original material and compression specifications, ensuring the valve stem seal forms a consistent, leak-resistant barrier from day one.
- Direct Drop-In Replacement — Matches the original valve stem diameter and groove profile of the HIF 690, allowing straightforward installation without modification or rework.
- Confirmed HIF 690 Fitment — Verified for the HIF 690 Flameless Air Heater (standard) and the HIF 690 Flameless Heater with Kubota Engine, covering both common configurations of this heater series.
- Maintains Combustion Efficiency — A correctly seated valve stem seal keeps fuel and air flow precisely regulated, supporting consistent heat output and efficient heater operation.
- Prevents Oil and Gas Migration — A worn or cracked valve stem seal allows oil or combustion gases to pass the valve guide, which can cause fouling, erratic combustion, and increased emissions — replacing it promptly restores clean, controlled operation.
A valve stem seal fits around the stem of an intake or exhaust valve where it passes through the valve guide, creating a controlled barrier that limits how much oil enters the combustion area while still allowing the stem to move freely. When the seal is in good condition, the combustion chamber stays clean and fuel burns efficiently. As the seal degrades — through heat cycling, age, or normal wear — it loses its ability to control oil flow, which can lead to fouling, hard starting, and uneven heat output in air heater applications like the HIF 690.
Part Details
| Part Number | 5100028337 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Valve Stem Seal |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HIF 690 Flameless Air Heater | HIF690 | 5100017599, 5200021915 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
