IH-S-B275 D I I n n t t e e r r n n a a t t i i o o n n a a l l H H a a r r v v e e s s t t e e r r Service Manual B-275 Diesel THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF INTERNATIONAL HARVESTER OR IT’S SUCCESSORS. INTERNATIONAL HARVESTER AND IT’S SUCCESSORS ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL. TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS. Service Manual
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IH-S-B275 D
IInntteerr nnaattiioonnaallHHaarr vveesstteerr
Service ManualB-275Diesel
THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF INTERNATIONAL HARVESTER OR IT’S SUCCESSORS. INTERNATIONAL HARVESTER AND IT’S SUCCESSORS
ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.
TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.
The B-275 Tractor is powered by a direct starting diesel engine which develops 35 flywheel horsepower (stripped) at 1875 rpm. It is equipped with electric glow plugs for ease in cold starting. A heavy duty dual clutch provides constant-running PTO permitting the tractor to be stopped without stopping or reducing the output of the PTO. The transmission provides eight forward and two reverse speeds. The main units and systems of the tractor are the diesel engine, electrical system, cooling system, hydraulic system, engine clutch, transmission, power take-off, differential, chassis (which includes the steering mechanism, wheels, and axles), and the brake s.
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Engine
The International Model BD-l44-A diesel engine powering the McCormick International B-275 Tractor is of the 4-cylinder, 4-cycle valve-In-head type with separate pre-combustion chambers. This type of engine depends upon the use of a high compression ratio to generate sufficient heat during the compression stroke to ignite the fuel charge.
During the induction stroke, pure air only is introduced into the cylinder. The temperature of this air is raised on the
compression stroke to approximately llOOoF. This temperature is sufficient to ignite the fuel, which is injected under great pressure toward the end of the compres sion stroke. The power stroke and exhaust stroke follow to complete the cycle,
It is upon the ability of the injection pump to meter the exact amount of fuel needed to match the power required and upon the ability of the injection nozzles to atomize the fuel to form a fine spray that the outstanding fuel economy of the diesel engine depends.
Electrical System
The tractor electrical system consists of the battery, charging system, cold starting system, starter motor system, and the
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lighting system. Two batteries are connected in series to form a l2-volt system. The generator, voltage regulator J and cutout relay function together to maintain the charge of the batteries at a constant level. The cold starting system utilizes glow plugs to pre-heat the pre-combustion chamber walls and air to aid in vaporizing the fuel and to raise the temperature of the combustion area in general. This assi sts in cold starting.
The starter motor is a four-brush, fourpole series wound type intended for use on diesel engines. The starter pinion is of the pre-engaged type drive, giving a positive engagement between the pinion and the flywheel ring gear before the torque is developed by the motor armature. Also incorporated is a dual purpose clutch, which protects the starter motor from overload in the event of backfire and also prevents the motor from being driven by the engine flywheel.
Cooling System Preventive Maintenance ........................................... . Radiator ................................................................... . Fan and Fan Belt ........................................................... .
Cooling System Service ......................................................... . Radiator Fan and Fan Belt
7 7 7
8 8 9
Water Pump ................................................................. 10 Thermostat .................................................................. 15
iIIust. 16. Valve guides assembled in cylinder head.
When replacing guides be certain that each gl,lide is inserted in its correct position. See Illusts. 15 and 16.
Intake and Exhaust Valves
Coat the valve sterns with engine oil and insert them from the bottom of the head. Each valve and its parts should be returned to the position from which it carne.
Place the valve spring onto the valve followed by the valve spring retainer cup. Compress the springs sufficiently to install the cup locks in the groove provided at the top of each valve stern.
Inj ection Nozzles
Install new pre-combustion chamber gaskets into the cylinder head and insert
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the pre-combustion chambers, using a pre -combustion chamber aligning tool. Ensure that the pre-combustion chamber is positioned correctly in the cylinder head, otherwise the glow plug element may contact the sides of the chamber and result in the element being burned out. See Illust. 17.
must. 17. Using a precombustion chamber aligning tool.
Install the second set of gaskets and the pre-combustion chamber holders.
Place the nozzle assembly into position on the studs. Install the nuts and tighten them to the specified torque of 30 to 35 foot-pounds.
General Description. Fuel System Air Cleaner. Fuel Tank .. Water Trap. Fuel Filter .. Injection Nozzles Injection Pump and Governor Fuel Feed Pump (Primary)
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4 4 4 5 6 6 6 7
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Trouble Shooting Chart. . . . . . . . . .. 11
Fuel System Venting. . . 13
Checks and Adjustments 14 Injection Pump Timing 14 Governor Seal Testing. 16 Governor Adjustment 16 Excess Fuel Device 19 Altitude De - rating 19 Low Power Output . 20
19. On pu:mps equipped with a ti:ming ring (Illust. 25). re:move the ti:ming ring fro:m the housing and discard it as it is not needed.
lIIust. 26. Removing hub securing screw.
20. Lock the drive hub with the ring co:mpressor wrench and re:move the hub securing screw (Illust. 26).
Illust.27. Removing governor weight assembly.
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21. Re:move the governor weight asse:mbly and splined shaft (Illust. 27).
IIlust. 28. Governor weight and drive shaft.
22. Re:move the O-ring fro:m its groove in the drive shaft. Pull the shaft out of the weight asse:mbly (Illust. 28).
Illust.29. Removing thrust sleeve and weights.
23. To re:move the weights fro:m their housing, lift out the thrust sleeve thereby allowing the weights to be re:moved with the thrust washer (Illust. 29).
24. Place a plastic or brass block on the flanged end of the housing, as shown in Illust. 30. Insert a dull screwdriver between the lower face of the seal and the botto:m of the seal housing. Apply downward pressure on the screwdriver to pry out the oil seal. NOT E: The block keeps the screwdriver fro:m contacting the housing .
General Description Battery ....... . Charging System . Cold Starting System. Starter Motor .. Lighting Sys tern . Heat Indicator ..
Trouble Shooting Chart
Testing ......... . Test Equipment Required. Tractor Wiring Diagram. Testing the Battery ..... Testing the Charging System Testing the Generator ..... Testing the Voltage Regulator. Testing the Cut-Out ...... . Testing the Cold Starting System. Testing the Starter Motor System.
As the generator speed rises contacts should close between 12.7 and 13.3 volts.
B. - CUT OUT
As the generator speed falls contacts should open at a reverse current between 3.5 and 5.0 amps.
lIIust. 23. Meter readings •• (A) = cut in, (B) = cut out.
:may be necessary to draw back the stop control to reduce idling speed sufficiently. Increase engine speed slowly. The cut-out points should close when the voltage rises to between 12.7 and 13.3 volts. The instant when the contacts close can be observed on the a:m:meter, the needle of which should flick when this occurs. See lllust. 23.
Decrease engine speed slowly. The cut-out points should open when the discharge or reverse current rises to between 3.5 and 5 a:mperes. If the cut-out does not operate between these li:mits the control box should be replaced, or if practicable, reset although again adjust:ment should only be atte:mpted by experienced personnel.
Testing the Circuit Resistance
Connect the negative (black) lead of the vo1t:meter to the generator ar:mature ter:mina1 and the positive (red) to the battery negative post as shown in lllust. 22.
Start the engine and run it up to governed
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speed. The voltage reading with the low range switch pressed should be no higher than:
0.75 volts when charging 5 a:mperes l. 0 volts when charging 10 a:mperes l. 5 volts when charging 15 a:mperes
If the voltage is higher, progressively :measure the voltage drop across each cable and co:mponent. The highest reading will indicate where the fault lies.
Testing the Cold Starting System
As the co:mponents of the glow plug circuit are connected in series with one another, the sa:me current :must flow through each, and the voltage drop across the individual co:mponents, when added together, :must approxi:mate the battery voltage.
While the current flowing through the co:mponents governs the operating te:mperature of the ele:ments, the proportion