The MF 275 and MF 285 Perkins AD4.236 share the same two-stage fuel filtration system as the rest of the late-production Perkins 4-cylinder MF range.
Primary filter: OEM 1447082M1. Inline filter protecting the lift pump from water and coarse contamination. Replace every 400 hours, or more frequently if operating in poor fuel-quality conditions.
Secondary filter: OEM 3637380M1. Final-stage filter for the injection pump. Replace every 200 hours without exception. The AD4.236 injection pump is a CAV/Lucas unit — it is expensive to repair and not tolerant of contaminated fuel.
Pakistan and South Asia note: Diesel quality in some markets contains significant water and particulate contamination. If your MF 275 works in these conditions, reduce secondary filter changes to 100 hours and consider fitting a pre-filter water separator between the tank and the primary filter. This single addition significantly extends injection pump life.
Bleeding: After replacement, loosen the secondary filter head bleed screw, prime the hand pump until fuel flows free of air, retighten, and start. Hard starting after a filter change means there is still air in the system — bleed again before cranking repeatedly.
Cross-Reference Table
| Supplier | Part Number | Fit | Notes | |
|---|---|---|---|---|
| Wix | 33117 | Drop-in | Primary inline — fits both OEM numbers | |
| Baldwin | BF7632 | Drop-in | Primary inline | |
| Fram | P4003 | Drop-in | Primary inline | |
| Donaldson | P551010 | Drop-in | Primary inline | |
| Fleetguard | FF5018 | Drop-in | Primary inline | |
| Mann | WK 940/13 | Drop-in | EU market |
Specifications
- Change interval
- Secondary: 200 hours (100 hours in poor fuel-quality conditions). Primary: 400 hours.
- Notes
- Bleed air after replacement. Consider water separator in markets with variable fuel quality.
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