Scope: Replace/remove and install the heater core on a Massey Ferguson MF50B tractor. Assumes basic mechanical skill. Estimated time 3–6 hours depending on experience and corrosion.

Safety first
- Work on a cold engine. Hot coolant will cause severe burns.
- Disconnect negative battery terminal.
- Wear safety glasses and nitrile gloves. Have rags ready.
- Park on level surface, set parking brake, block wheels.
- Support any removed panels or cab components so they don’t fall.
- Collect coolant in an appropriate container and dispose/recycle per local laws.

Tools and supplies
- Metric socket set (8–19 mm), ratchet and extensions
- Combination wrenches (8–19 mm)
- Screwdrivers: Phillips and flat
- Pliers: slip-joint, needle-nose
- Hose clamp pliers or pickup/locking pliers for spring clamps
- Utility knife (for cutting old hoses if necessary)
- Small pick or dental pick (for seal removal)
- Drain pan (sized for several liters)
- Funnel and clean coolant (check MF spec—usually ethylene glycol antifreeze diluted per manual)
- Replacement heater core (OEM or compatible for MF50B) — confirm part number with dealer
- New heater hoses or at least new hose clamps and new O-rings/seals for heater core pipes if applicable
- Shop towels, container for small parts, anti-seize (optional)
- Torque wrench (useful but not critical for most heater-box fasteners)
- Silicone sealant or gasket maker (only if specified by service manual for heater box seams)
- Service manual or photos to aid reassembly

Parts commonly required
- Heater core assembly specific to MF50B
- Hose clamps (worm-drive or spring clamps as original)
- Heater hoses (if brittle or swollen)
- O-rings/gaskets for heater tube fittings (if used)
- Coolant to refill and bleed system

Step-by-step procedure
1. Prepare and drain coolant
- Let engine cool completely. Place drain pan under radiator/petcock. Open radiator drain or remove lower radiator hose to drain coolant into pan. Retain coolant if clean and reusable, otherwise dispose.

2. Remove seat/console and dash panels for access
- Remove seat and any center console pieces obstructing access to heater box/dash area. On MF50B you will likely remove side panels and dashboard lower trim to get to the heater housing behind the dash. Remove screws/bolts and keep fasteners labeled.
- Use photos or label wires/controls to ensure correct reassembly.

3. Isolate heater control linkages and cables
- Disconnect the heater control cable and any vacuum/electrical connectors attached to the heater box. Mark position so controls reattach properly.

4. Access heater hoses at firewall
- Follow heater hoses from engine coolant system to the heater box on the firewall. Place drain pan under hose connections. Loosen hose clamps and disconnect hoses at firewall fittings. Expect coolant to drain from hoses; catch it.
- If hoses are stuck, cut them off with utility knife; be prepared to replace them.

5. Unbolt heater box from dash/firewall
- Remove bolts/screws securing heater housing to firewall and dash frame. Support the housing as you remove fasteners. Some bolts may be internal—remove dash screws to get full access.
- Be careful with plastic clips; work slowly to avoid breaking brittle plastic.

6. Remove heater core from housing
- Open the heater box (usually two halves) by removing screws/clips. Note orientation of internal ducting and seals.
- Slide out old heater core. Note the position of inlet/outlet tubes and any seals or grommets. Remove old grommets and clean mating surfaces.

7. Inspect and prepare replacement core
- Compare old and new cores for correct size and tube location. Replace any foam seals, grommets, or mounting pads. Install new O-rings on inlet/outlet tubes if applicable.
- If new core has protective plugs, remove them now.

8. Install new heater core into box
- Place new core in the heater box with correct orientation. Reinstall any seals, grommets, or mounting brackets. Ensure the core seats without pinching or deforming sealing surfaces.
- Reassemble heater box halves and tighten fasteners snugly. Avoid overtightening plastic screws.

9. Reinstall heater box in tractor
- Reposition heater housing on firewall. Reconnect control cables and any heater hoses internal to box.
- Bolt housing to firewall/dash, reconnect controls, and all electrical connectors removed earlier.

10. Reconnect heater hoses at firewall
- Slide new or existing hoses over inlet/outlet pipes and secure with new hose clamps. Ensure hoses route without kinks and away from hot/exhaust components.

11. Refill cooling system and bleed air
- Reinstall radiator drain and refill coolant to proper level with specified antifreeze/water mix. Leave radiator cap off.
- Start engine and run at idle with heater on high so heater core fills and air is expelled. Squeeze upper heater hoses gently to help purge air. Watch for leaks at hose connections and around heater box.
- When thermostat opens and coolant circulates, top off coolant to correct level. Replace radiator cap. Run engine to operating temp and recheck levels after cool-down.

12. Final checks
- Confirm heater provides hot air and no leaks are present. Reinstall dash/trim/seat. Dispose of old core and used coolant properly.

Tool usage notes
- Ratchet/socket: Use right-sized socket and extension to reach fasteners; use breaker bar for seized bolts, then ratchet for final removal. Keep sockets aligned to avoid rounding bolt heads.
- Wrenches: Use box-end where possible to prevent slippage on hex fasteners.
- Hose clamp pliers: Compress spring clamps and hold while sliding clamp back to release; worm-drive clamps require screwdriver or nut driver to loosen.
- Pliers/needle-nose: Remove clips and pull grommets carefully; use pick to scrape old gasket material.
- Utility knife: Cut old hoses if needed; score several times and twist to avoid ragged edges that interfere with fitment.
- Funnel and bleed technique: Use funnel in radiator neck to reduce splashing; run with heater in-cab set to hot to circulate through core.

Common pitfalls and how to avoid them
- Breaking dash or plastic clips: Work slowly, use proper trim tools or flat screwdriver with care. Heat brittle plastic with a heat gun briefly if necessary (low setting).
- Mixing up hose orientation: Label hoses before removal or take photos. Reversed hoses might not cause catastrophic issues but can hamper control valve orientation.
- Air trapped in system: Failure to properly bleed will cause poor heater performance and overheating. Run engine, squeeze hoses, and use any bleed screws if present.
- Reusing old brittle hoses or clamps: Replace if they feel hard/cracked. Old clamps often fail; use new quality clamps.
- Damaging heater box seals: Replace foam seals/gaskets; using silicone sealant where not specified can obstruct airflow or; only use where manual allows.
- Stripped or rounded fasteners: Use correct sized tools; apply penetrating oil to rusty bolts and wait before forcing them.
- Cross-threading tube fittings: Start threads by hand; don’t force.
- Environmental/legal: Improper disposal of coolant is illegal and hazardous—collect and recycle.

When to call a dealer/professional
- If access requires removal of cab structure or hydraulic system disassembly.
- If heater box is severely corroded or welded in place.
- If you cannot stop leaks or bleeding after reassembly.

End notes
- Confirm exact replacement part number for MF50B with Massey Ferguson parts supplier before purchasing.
- Save all removed fasteners and parts in labeled bags and take photos during disassembly for easier reassembly.
rteeqp73

MF 50B - Demontering stickcylinder Massey Ferguson MF 50B Demontering av cylindern till stickan. Stålring som håller övre kolvstångsföraren på plats är ...

Getting the MF50A Back Together When you're putting a tractor back together, alignment is crucial.

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