Description
Overview:
This Genuine Jap engine valve (OEM 20978) is a direct replacement component for Jap industrial engines used in plant, generators, pumps, and other machinery. Built from durable steel, it is made to handle the heat and mechanical load inside the cylinder head, helping to maintain compression and smooth gas flow. The valve features a 1 1/16 inch head (about 27 mm) and an overall length of 3 inches (about 76 mm), matching original factory dimensions for reliable seating and stem guidance. Supplied as unused old stock, it may show light tarnishing or storage marks, but it remains fit for service once inspected and cleaned. Ideal for keeping vintage equipment authentic, it supports routine maintenance and restoration where the correct Jap geometry and materials matter.
Key Features:
- Genuine Jap part (OEM 20978) for correct fit and function
- Head diameter 1 1/16 in (approx. 27 mm) for proper seat contact
- Overall length 3 in (approx. 76 mm) to suit original valve train stack-up
- Robust steel construction for dependable running in industrial duty
- Machined seating face and stem for accurate alignment and sealing
- Direct replacement pattern to simplify installation and setup
- Suitable for vintage machinery where OE dimensions are critical
- Supplied as unused old stock; cosmetic ageing may be present only
- Helps restore compression and performance in tired engines
- Works with standard Jap guides, springs, and retainers where specified
Typical Applications:
Replacement of worn, pitted, or bent valves in Jap industrial engines powering site generators, pumps, compact plant, and stationary equipment. Useful during top-end rebuilds, decokes, and full restorations to recover sealing, starting, and idle quality while keeping original specification parts on older machines.
Also known as:
Jap engine valve, industrial engine valve, poppet valve for Jap engines, OE valve 20978, replacement cylinder head valve, intake/exhaust valve (use position as specified by your engine manual).
Product Specifications
| L&S Part No. | 20978 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Jap |
| OEM No. | 20978 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Key Features | - Genuine Jap part (OEM 20978) ensures correct fit and function - Head diameter 1 1/16 in (approx. 27 mm) for proper seat contact - Overall length 3 in (approx. 76 mm) matches original valve train - Robust steel construction for industrial duty reliability - Works with standard Jap guides, springs, and retainers |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
