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Massey Ferguson 230, 235, 240, 245, 250 - Continental Z-145 gasoline engine

MF 230, 235, 240, 245, 250 Tractors Repair Operations

Remove and reinstall engine assembly

Massey Ferguson 230, 235, 240, 245, 250 gasoline models are equipped with Continental Z-145, four cylinder engine.

Remove and reinstall engine assembly - First drain cooling system and, if engine is to be disassembled, drain oil pan. Remove front grille panels and disconnect battery cables. Remove fuel tank cap, radiator cap and hood. Disconnect headlight wires and pull wiring free. Disconnect both radiator hoses, radiator brace and, on models so equipped, hydraulic oil lines and front mounted pump. Support tractor at front of transmission. Position wedge blocks between front axle and axle support. Support the front end assembly at front and rear. Disconnect drag links and radius rods at rear of models so equipped. On models with drag links, attach drag links to axle so wheels will be straight ahead and will not turn. On Massey Ferguson 230, 235, 240, 245, 250 tractors with power steering, disconnect lines and cover all hydraulic steering openings. Unbolt the front assembly and carefully roll away from tractor. Shut fuel off at tank, unclip headlight wires from side of tank, disconnect wire from fuel gage sending unit, detach fuel line from shut off valve, then remove the fuel tank. Disconnect battery ground strap and wires from alternator, starter motor, ignition coil and water temperature gage sending unit. Detach tachometer drive cable and housing, air cleaner hose, breather tube, throttle rod, choke cable, engine oil pressure line and muffier (or exhaust pipe). Disconnect the power steering lines along left side of cylinder head on models so equipped. Attach a hoist to engine, be sure that all wires, lines, hoses and rods are out of the way, then unbolt and separate engine from transmission. Lubricate clutch shaft splines with lithium base grease before connecting engine to transmission. Install in reverse of removal procedure. Fill and bleed and power steering system.

Cooling system

Radiator - All Massey Ferguson 230, 235, 240, 245, 250 tractor use a 48 kpa (7 psi) pressure type radiator cap. Cooling system capacity is 9.5 L (10 U.S. quarts). Be sure all pads, braces and shrouds are installed in correct locations to assure proper cooling. Thermostat - The thermostat is contained in a separate housing behind the outlet elbow. The thermostat should begin to open at 81C (178 F) and be fully open at 93C (200F). Water pump - Drain cooling system, remove fan and belt, then unbolt and remove water pump from rear housing. The rear housing can be unbolted and removed after pump is off and lower radiator hose is disconnected. Remove pulley using a puller attached to fan mounting hub. Remove snap ring, then press shaft and bearing toward front out of impeller and pump body. Assemble, install slinger onto short end of shaft, then press the shaft and bearing assembly into body until bearing bottoms in bore. Install snap ring. Coat outside of seal with sealing compound, position gasket around seal, then install in housing with carbon face toward impeller. Install the rubber collar retainer in bore of impeller, then insert ceramic collar. Be sure side with three holes is toward impeller. Press impeller onto shaft with open side of blades out until distance is 22.35-24.38 mm (0.880-0.960 inch). Support shaft and press pulley onto shaft until distance from center of pulley groove to mounting surface of water pump is 42.86 mm (1-11/16 inches). Water pump mounting holes are offset permitting installation only one way.

Ignition

Timing - Timing marks are located on flywheel with a timing window on left side of engine block. Initial (static) timing should occur at 8 degrees BTDC. Maximum advance should be 27 degrees (crankshaft) at 2200-2250 engine rpm; 28 degrees (crankshaft) at 2425-2500 engine rpm. These rpm ratings are the recommended high idle no-load governed speeds for MF 230 models (2200-2250 rpm); MF 235, 245 models (2425-2500 rpm). Firing order is 1-3-4-2. Distributor shaft rotation is counterclockwise viewed from above (rotor end). Install distributor, be sure breaker point gap is 0.43-0.56 mm (0.017-0.022 inch) which should provide dwell of 66-72 degrees. Turn crankshaft slowly until number one piston begins coming up on compression stroke, then stop when 8 degree BTDC mark is visible in timing hole. Install distributor with rotor pointing toward number one spark plug. The distributor body should be rotated until wire to coil is straight to rear. Install distributor clamp finger tight. Turn distributor clockwise until breaker points just start to open, then tighten distributor clamp screw enough to hold distributor position. Start engine and check running timing at high idle no-load rpm.

Overhaul - Prestolite 1BT-4406 distributor used on all models. Disassembly is by removing breaker plate, clip and pin. Assemble parts, then install snap ring. The shouldered washer should be above and should enclose nat washer. Distributor shaft end play should be 0-0.25 mm (0-0.010 inch). Breaker point gap of 0.43-0.56 mm (0.017-0.022 inch) should provide dwell of 66-72 degrees. Breaker point spring tension should be 4.7-6.1 N. Delco-Remy 1115065 ignition coil is used on all models. Primary winding resistance should be 3.3-4.1 ohms at 24C (75F). Secondary winding at the same temperature should be 3000-20000 ohms. Recommended spark plugs are Champion RD-16, Massey-Ferguson MF834242 or equivalent. Electrode gap should be 0.64 mm (0.025 inch). Manufacturer recommends renewing spark plugs after every 300 hours of operation.

Lubricating system

Oil pump - The gear type oil pump is mounted on the bottom of front main bearing cap and is gear driven from crankshaft timing gear. Pump is accessible after oil pan is removed. Shims control the backlash of oil pump drive gear. Recommended backlash is 0.089-0.107 mm (0.0035-0.0042 inch). If backlash is not as specified, vary the thickness of shim pack. Be sure that main cap is tightened to recommended torque of 115-129 Nm (85-95 ft.-lbs) when checking backlash. Check pump internal gears for backlash, which should be 0.03-0.13 mm (0.001-0.005 inch). End play of gears with a 0.18 mm (0.007 inch) thick gasket installed, should be 0.05-0.10 mm (0.002-0.004 inch). Recommended diametral clearance between gears and pump body is 0.08-0.10 mm (0.003-0.004 inch). If clearance exceeds 0.13 mm (0.005 inch), renew gears and/or body. When installing pump cover, tighten retaining screws to 11-14 Nm (8-10 ft.-lbs.). Relief valve - The plunger type oil pressure relief valve is located in oil pump body. Normal operating oil pressure should be not less than 50 kPa (7 psi) at low idle and 140-205 kPa (20-30 psi) at 1800 rpm. Relief valve setting is adjustable by varying the number of adjusting shims. The relief valve spring should have a free length 49.2-52.4 mm. Spring should test 57.3-59.5 N (12.9-13.3 pounds) when compressed to working length of 34.9 mm (1.375 inches).

Z-145 gasoline engine carburetor

Adjustment - Zenith carburetors are used on all Massey Ferguson 230, 235, 240, 245, 250 models. The smaller OE3435 carburetor is used on MF 230 models, while 13795 is used on MF 235, 245 models. Initial setting of idle mixture needle is 2 to 2-112 turns open from closed position on the smaller carburetor, 5/8 to 3/4 turn open for the larger 13795 carburetor. Final adjustment should be made with engine operating at normal temperature. After mixture is correctly set, adjust low idle speed to 725-775 rpm for all models.

Overhaul - Zenith OE3435 carburetor used on MF 230 model tractors is smaller and slightly different than the 13795 carb used on MF 235, 245 model tractors. To disassemble the removed carburetor, firsl clean outside with a suitable solvent. Remove the screws retaining throttle body to fuel bowl and remove fuel bowl. Remove float shaft, float and inlet valve needle. Float shaft is a tight fit in slotted side of hinge bracket and should be removed from opposite side. Remove venturi, inlet valve seal and idle jet from throttle body. Remove idle adjusting needle. Remove plug, discharge jet, main jet and well vent jet from fuel bowl. Remove throttle and choke valves, shafts and packing. Discard all gaskets and packing and clean remainder of parts in a suitable carburetor cleaner. Rinse in clean mineral solvent and blow out passages in body and bowl with compressed air. Renew all gaskets and packing and any other parts which are worn or damaged. Following specifications for the two different carburetors. Zenith 13795 carburetor: Venturi - 21 mm, Main Jet - 1.35 mm, Idle Jet - 0.80 mm, Main Discharge Jet - 2.80 mm, Well Vent - 1.00 mm, Fuel Valve Seat - 1.75 mm. Zenith OE3435 carburetor: Venturi - 15 mm, Main Jet - 0.95 mm, Idle Jet - 0.55 mm, Main Discharge Jet - 2.75 mm, Well Vent - 1.1 mm, Fuel Valve Seat - 1.75 mm.

Assemble by reversing the disassembly procedure, using new gaskets and packing. Install throttle plate so beveled edges will fit throttle body bore with throttle closed, with side of throttle plate farthest from mounting flange aligned with idle port. Adjust float height to 7.14 mm (9/32 inch) for MF 230 models, 3.97 mm (5/32 inch) for Massey Ferguson 235, 245 tractors. Measure float height from gasket to nearest edge of float as shown. Drill bits can be used as gages as shown. If adjustment is required, carefully bend float arms using needle nose pliers or a bending tool, keeping the two halves of float parallel and equal. Check idle mixture and idle speed adjustments after installation.

Governor

Adjustment - Start engine and be sure ignition is correct. Adjust idle speed stop screw to obtain correct idle speed of 725-775 rpm. Adjust mixture needle to obtain highest smoothest idle, then readjust idle speed if necessary. Stop engine and disconnect carburetor link from governor arm. Move hand throtlle lever to maximum (fast) position to create tension on spring. Move carburetor rod to wide open position and adjust length of rod until approximately 1 mm (1/32 inch) too short. Reconnect rod after adjustment is correct. High no-load speed should be adjusted 2200-2250 rpm for MF 230 models; 2425-2500 rpm for all MF 235, 245 models. High speed adjustment is accomplished by changing the length of rod. Initial adjustment of linkage can be accomplished as follows: Measure length of rod from centerline of rod end at top to lower end of sleeve inside spring. Conect distance is 236.5 mm (9-5/16 inches) for MF 230 models; 239.7 mm (9-7/16 inches) for MF 235, 245 Orchard models; 242.9 mm (9-9/16 inches) for all other MF 235, 245 models. Correct length from center-to-center of rod is 565.2 mm (22-1/4 inches) for MF 235, 245 Orchard models; 701.7 mm (27-5/8 inches) for all other models. Rear end of throttle rod should be in upper hole for rear spring arm for Massey Ferguson 235, 245 models; lowest hole of rear spring arm for MF 230 models. On Orchard models, length of rear rod should be 177.8 mm (7 inches) and spring bracket should be clamped to rod 120.7 mm (4-3/4 inches) from centerline of ball joint at front. Loosen clamp arm, align with arm, then retighten clamp. On all except, Orchard models, loosen clamp arm and position hand lever 6.4 mm (1/4 inch) from low speed stop position. Move the governor arm lever towards carburetor (closed position), then tighten clamp arm.

Overhaul - Overhaul the governor, first remove timing gear cover. The governor lever shaft is supported in needle bearings in timing gear cover. To service the shaft, bearings or oil seals, remove the pipe plug from front of timing gear cover, drive out the groove pin and withdraw the lever. The dust seal (felt) and the oil seal (lip toward inside) can be renewed at this time. Remove needle bearings, drive the bearing stop pin in until it falls into shaft bore. Remove the stop pin, then drive the needle bearings out of cover bore. Grease shaft needle bearings before installing. Drive inside bearing into bore until just past hole for locating pin, then install the locating pin. Drive outer bearing in until it is flush with counterbore for oil seal. Drive oil seal into bore wilh lip toward inside until the seal bottoms in counterbore. Assemble felt seal, shaft and rocker lever into cover, then in stall roll pin through rocker lever and shaft. Governor ball and driver assembly is available only as a unit which can be renewed after removing camshaft nut. Tighten the camshaft nut to a torque of 95-108 Nm (70-80 ft-lbs.). Withdraw thrust cup assembly, make sure the lip tab is not broken or shaft is not scored. Also check ball race for channeling. Plunger bore in camshaft is vented by a drilling which emerges from shaft just to rear of front cam; governor action will be impeded if vent is plugged. Before installing timing gear cover, tum the cup assembly until tab is at 6 oclock position.