The Massey Ferguson 8660 tractor primary air filter part number is 6259119M91. The inner safety filter is 3703704M91.
Massey Ferguson 8660 Air Filter Details
Primary air filter part number
6259119M91
Inner safety air filter part number
3703704M91
Outer air filter part number
7068069M1
Air filter dimensions
Length: 11.8 in | Outside diameter: 5.4 in | Inside diameter: 2.8 in
Air Filter Service Interval Guide
Air Filter Service Interval Guide
Dusty use
100 hrs
Average
500 hrs
Light use
1,000 hrs
Listed Filter Size Check
Length
11.8 in
Outside diameter
5.4 in
Inside diameter
2.8 in
These are practical inspection/replacement guide ranges for the large ag tractor category. Dusty work can shorten the interval heavily, so use the restriction indicator and operator manual first.
Massey Ferguson 8660 Extra Air Filter Notes
Engine displacement
8.4 L | 512.6 cu in
Engine horsepower
265 hp | 197.6 kW
Primary filter note
For the Massey Ferguson 8660, the listed primary air filter part number is 6259119M91. Match the number before buying because air cleaner setups can vary by engine, serial range and market.
Outer filter note
The listed outer air filter part number is 7068069M1.
Safety filter note
The listed inner safety air filter is 3703704M91. Do not remove the safety element for normal cleaning; replace it if dirty, damaged or oil-soaked.
Fitment note
Listed dimensions: Length: 11.8 in | Outside diameter: 5.4 in | Inside diameter: 2.8 in. Use dimensions as a second check, not as the only buying method.
Filter size note
The listed dimensions point to a mid-size element length at 11.8 in and normal outside diameter at 5.4 in. Use that as a fitment sanity check against the old filter.
Power range note
With a 265 hp engine class, the horsepower is high compared with the listed element size, so restriction checks matter more. Watch for weak pull, smoke or heat under load before waiting for the full 500-hour guide.
Engine airflow note
A similar horsepower rating does not guarantee the same filter if displacement or engine family changes. Use the engine data as a sanity check only.
Service note
Clean loose dust from the air cleaner housing before pulling the filter. Never run the tractor with the filter removed, even for a quick test.
Massey Ferguson 8660 Air Filter FAQs
How do I avoid mixing up the Massey Ferguson 8660 air-filter elements?
For a full parts check, separate the service element from the safety element: buy the outer/primary service element first, then buy the inner safety element only if it is dirty, damaged or due. Do not accidentally order 7068069M1 when you meant the safety filter, or 3703704M91 when you meant the outer filter.
What is the safest way to match a Massey Ferguson 8660 air filter?
Use 6259119M91 as the anchor number, then verify the old element and housing label. This is a Massey-style M-suffix number, and the setup looks like a primary, outer and inner safety element setup, so one loose search result is not enough. The size data points to a mid-size element, so compare the removed element against both length and outside diameter before fitting.
What does the Massey Ferguson 8660 horsepower and filter size combo tell me?
Horsepower tells you airflow demand; length and outside diameter tell you rough element size. Together they say whether restriction is a service concern or mostly a fitment check.
Would I be strict with the Massey Ferguson 8660 air filter condition?
Yes. The power-to-filter-size relationship makes restriction and seal condition worth taking seriously. Replace a questionable element before heavy dusty work.
What do the Massey Ferguson 8660 air filter dimensions tell me?
Because the element has listed length, OD and ID, measure the old filter the same way. Do not compare one seller’s overall height to another seller’s gasket-to-gasket length without checking the drawing.
What part-number mistake should I avoid on a Massey Ferguson 8660?
The primary number format is a Massey-style M-suffix number, while the page also has separate companion numbers. That is exactly where copy-paste ordering mistakes happen.
What does the outer-filter listing mean for the Massey Ferguson 8660?
This looks like a multi-element setup. Keep the outer/primary service element and the inner safety element separate when ordering, because mixing up 7068069M1 and 3703704M91 is the easy mistake.
Official information note
Mistakes do happen. Air filter specs can change by year, engine, serial range, market and air cleaner housing. Check the old filter, operator manual, parts book and official masseyferguson.com website before ordering or installing an air filter.
