Case G188B Engine Service Manual
TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, HEREIN ARETHOSE OF ANDUSED CONTAINED NAMES AND TRADE TRADE MARKS AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS. OTHERS. OF TO THEPRODUCTS TOREFER SENSE AND AREUSED HEREINADESCRIPTIVE THIS IS A MANUAL PRODUCED BY PRODUCED THIS ISAMANUAL 630 SeriesTractors G188B GasEngine ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL. OFTHIS MANUAL. OR ACCURACY THE QUALITY FOR ARENOTRESPONSIBLE Group BEngine J.I. CASE J.I. CASE OR IT’S SUCCESSORS. OR IT’S Service Manual WITHOUT THE AUTHORIZATION OF THE AUTHORIZATION WITHOUT INC. JENSALES J.I. CASE J.I. CASE AND IT’S SUCCESSORS IT’SSUCCESSORS AND CA-S-ENG G188B
Service Manual GROUPB - SPARK IGNITION ENGINE
SECTION I, GENERAL ENGINE SPECIFICATIONS .
,Contents of Engine Group ...... '...... B- 5 General Specifications . ~ : ...... B-6 Torque Wrench Recommendations...... , ...... B- 9
SECTION II, SERVICE SUGGESTIONS AND TROUBLE SHOOTING CHART
Trouble Shooting Chart . . ~ . . ',' ...... B- 10 Starting Motor Will Not Turn Engine ...... B- 13 Engine Will Not Start (Weak Spark) ...... B- 14 Engine Stalls on Idle...... , ...... B- 15 Engine Misses at High Speeds ..•...... B- 16 Ignition System Faulty ...... , ...... B- 17 Engine Lacks Power ...... '. ',' ...... B- 18 Excessive Oil Consumption ...... B- 19 Excessive Oil Pressure Gage Reading...... B- 20 Anti-Freeze in Crankcase .' ...... " . " .... . 'B- 21 Engine Stand...... •...... B- 22 Engine Lifting Bracket ...... B- 23
SECTION III, CYLINDER HEAD ASSEMBLY
Rocker Arm Disassembly - Inspection ...... B- 24 Removing Rocker Arm Assembly ...... B- 25 Rocker Arm Assembly Installation ...... B- 27 Valve Cover Removaland Installation •...... B- 28 Cylinder Head Removal ...... : ; ...... ; ...... B- 29 Servicing Valves and Valve Seats ...... ~ ...... B- 31 Valve Removal From Head ...... B- 31 Checking Valves .., ...... ; .. ',' ...... '.' B- 32 Valves to Discard ...... , •... '.' ... ; ...... •.. B- 33 'Valve Stem Nicked and Worn ...... ; ...... ; ...... B- 34 Servicing Valve Seats in Cylinder Head ...... B- 34 Checking Valve Seat,Runout ...... '...... " ...... B- 36 Grinding Intake Valve Seats ...... B- 37 Servicing Valve Guides ...... ,...... " ...... B- 38 PreSSing Valve Guides into Head ...... • ...... B- 39 Valve Springs .. , ...... " ...... B- 40 Valve Rotators ...... " ...... : ...... B- 41 Checking Cylinder Head for Straightness ...... B- 42 Reassembly of Cylinder Head ...... B- 43 Valve Tappet Clearance ...... ; .. ; ...... B- 44 Determining Top Dead Center on Compression Stroke ...... B- 45 Installing and Servicing Manifolds...... B- 45
SECTION IV, WATER PUMP AND COOLING SYSTEM
Water Pump Removal...... B- 47 Water Pump - Reassembly...... B- 48 Cooling System...... B- 50 Thermostat .. '...... ; .... .' .' ...... B- 51 Testing Thermostat...... B- 52 Fan Belt Adjustments ...... : ...... B- 52
B-1 GROUP B - SPARK IGNITION ENGINE
SECTION V, ENGINE LUBRICATION SysnM
Oil Flow Diagram ., ...... B- 53 Oil Pan Removal and Installation ...... B- 54 Oil Pump...... B- 54 Relief Valve Spring - Oil Pump...... B- 56 Installing Oil Pump ...... B- 57 Installing Oil Filter Base ...... B- 58 Crankcase Breather ...... B- 59
SECTION VI, CHECKING CYLINDER COMPRESSION
Checking Compression Pressure ...... B- 60 Locating Compression Loss ...... B- 60
SECTION VII, CONNECTING RODS, PISTONS, AND CYLINDER SLEEVES
Piston and Connecting Rod Removal ...... B- 61 Ring Specifications...... B- 62 Installing Replacement Ring Sets ...... B- 64 Removing and Installing Piston Pins ...... B- 66 Installing Piston Pin Bushings ...... B- 67 Connecting Rods and Bearing Liners...... B- 68 Cylinder Sleeves ...... B- 70 Cylinder Sleeve Removal and Installation ...... B- 71
SECTION VIII, CRANKSHAFT AND MAIN BEARINGS
Removing Main Bearing Liners ...... B- 73 InspectIng Bearing Liners ...... , ...... B- 74 Installing Bearing Liner~ . . . : ...... , ...... B- 74 Measuring Crankshaft Journals ...... ~ ...... • ...... B- 75 Crankshaft End Play ...... B- 76 Crankshaft Assembly - Exploded View ...... B- 77 Crankshaft Removal ...... ; ...... B- 78 Crankshaft Dimensions ...... •...... B- 79 Installing Main Bearings...... B- 80
SECTION IX, CAMSHAFT AND PUSH RODLIFTERS
Camshaft Assembly - Exploded View ...... B- 81 Camshaft Dimensions ...... , ...... B- 82 Pulling Camshaft Bushings .•...... B- 83 Installing Camshaft ...... B- 84 Measuring Stud Height Above Block...... B- 85
SECTION X, CRANKSHAFT PILOT BUSHING AND REAR OIL SEAL
Crankshaft Pilot Bushing...... B- 86 Rear Crankshaft Oil Seal...... B- 86
B-2 GROUP B - SPARK IGNITION ENGINE
SECTiON XI, TIMING GEAR COVER AND GOVERNOR
Removing Crankshaft Pulley ...... 0 ••••••••••••••••••• 0 B- 88
Removing Governor Lever and Arm Assembly ... 0 0 • 0 0 •• 0 • 0 0 0 •• 0 0 0 • 0 0 0 0 0 ••• B- 89
Governor and Throttle Linkage . 0 ••• 0 ••• 0 0 0 0 0 0 0 0 0 0 •• 0 • 0 ••• 0 ••••• 0 •• 0 •• B- 90
Removing Flyweight Governor o. . 0 ••• 0 0 • 0 0 0 • 0 • 0 •• 0 • 0 0 0 0 • 0 0 •• 0 0 •• 0 ••• B- 91
P .ToO. and Belt Pulley Data for "630" Series Tractors. 0 0 0 • 0 • 0 0 0 ••• 0 0 ••• 0 0 •• 0 B- 92
Governor Linkage 0 0 0 • 0 • 0 0 0 0 0 • 0 0 • 0 0 0 0 0 • • • 0 0 • • o. ... 0 • 0 0 • • • • B- 92
Hand and Foot Throttle Linkage. 0 0 • 0 •• 0 0 0 0 • 0 0 0 0 0 •• 0 •• 0 0 •• 0 0 0 ••••• 0 0 0 • 0 B- 93
SECTION XII, ENGINE RUN-IN PROCEDURE
Engbe Run-in Procedure .00 •• 0 0 0 000 0 0 000000000 ••• 0 • 0 •••••••• 0 o. B- 94
SECTION Xiii, AIR CLEANER
Cleaning Air Cleaner ...... • B- 95
Checking Power Loss Through Air Cleaner . . .. 0 ••••••••• 0 B- 95
SECTION XIV, GASOLINE FUEl. SYSTEM
Carburetor Adjustments .. B- 96
Fuel Filter ...... 0 B- 97 Carburetor Adjustment Procedure B- 98
Zenith Carburetor ...... 0 ••• 0 0 B- 99
Service and Repair Procedure (Zenith Carburetor) 0 • • B-101
Marvel - Schebler Carburetor ...... 0 ••••••••• 0 •••• 0 •• B-105
SECTION XV, ELECTRICAL
Electrical Wiring Diagram ...... 0 •••••••••••• 0 •• 0 0 •••••• 0 ••••• 0 • B-108
Batteries 0 • • • • • • • • • • • • • • • • • ••••••••• 0 •• 0 0 • 0 0 ••• 0 •••••••••••• B-109
Generator and Voltage Regulator . 0 •••••••••••••••• 0 0 ••••••• 0 • 0 ••• 0 • 0 •• B-110 Engine Timing ...... B-110
Cleaning Contact Points in Distributor ...... 0 •••• B-l13
Engine Block Heater ...... 0 • • • • • • • • • • • • • • • • • ••••••••• B-l13
Distributor Calibration Chart ...... 0 0 •••• 0 • B-112
B·3 GROUP B _ SPARK IGNITION ENGINE (QtllEtllS Of ENGINE GROUP
continued From Page B-4 SECllON :xIL PAGE \3 -94 ENGINE RUN-IN PROCEDURE
SECTION.:x:nI- PAGE 6-95 AIR CLEANER
SECTION :z:. PAGE 8-86 CRANKSHAfT PILOI BUSHING AND REAR OIL SEAL
SECTION JJ:. PAGE i\~\NG GEAR C AND GO\l£RNOR
SECTION -:slJ1I. PAGE 6-73 CRANKSHAfT AND MAIN BEARINGS SECTION JX,.PAGE 6-8\ SECTION"];5L pAGE \3-108 CA~SHAn AND pusH ELECTRICAL ROD LIfTERS GROUP B - SPARK IGNITION ENGINE
SECTION I, GENERAL ENGINE SPECIFICATIONS
Type ...... CASE 4 Cylinder, 4, Stroke Cycle Valve-In-Head Engine Type of Cylinder ...... " ...... Wet Sleeve Bore ...... 3 13/16" Stroke ...... 4 1/8" Piston Displacement ...... 188.4 Cu. In. Compression Ratio...... 7.34 to 1 Firing Order ...... 1-3-4-2 Full Governed Engine Speed Case-O-Matic (No Load) ...... 2400 R.P .M. Full Governed Engine Speed Case-O-Matic (Full Load) ...... 2250 R.P .M. Full Governed Engine Speed Dry Clutch (No Load) ...... 2150 R.P .M. Full Governed Engine Speed Dry Clutch (Full Load) ...... 2000 R.P .M. Engine Idle Speed ...... 500 R.P .M. Compression Pressure with Engine at operating temperature at Cranking Speed of "200 R.P .M." .. 125 lbs. Allowable Variance Between Cylinders ...... Plus or Minus SIbs. Air Cleaner ...... Heavy Duty Oil Bath Oil Filter Crankcase ...... Full Flow-Throw Away Type Unit Positive Type Valve Rotators...... Standard Equipment Crankcase Capacity ...... 4 Quarts (5 with Filter)
CYLINDER SLEEVES
Type ...... Replaceable Wet Type: Two "0" Ring Seals on Each Sleeve. Inside Diameter of Sleeve Bore ...... 3.8130" to 3.8145" Piston Clearance in Sleeve (At Skirt) ...... 0025" to .0055"
PISTONS AND PISTON PINS
Piston Material ...... Aluminum Alloy Diameter of Piston at Top ...... 022 to .026 less than Major Skirt Dia. Diameter of Piston at Skirt ...... 3.8090" to 3.8105" Piston Pins .... Full Floating; Held in Position with Snap Rings in Piston; Replaceable Bronze Bushing in Connecting Rod. Piston Pin Diameter...... 9991" to .9992" Piston Pin Fit in Piston...... Snug Fit by Hand (Piston at 700 F.) Piston Pin Fit in Connecting Rod Bushing ...... 0002" to .0006"
PISTON RINGS (Original Equipment)
"Rings per Piston ...... 4 (3Cornpression and 1 Oil) COMPRESSION RINGS (TOP 3) 1st., 2nd and 3rd Rings (Tapered) ...... Top Marked "TOP" Width of Rings (3 Compression) ...... 0930" to .0935" Width of Ring (Oil) ...... , .2485" to .2490" Ring Gap in Cylinder (3Compression) ...... 010" to .020" Ring Gap in Cylinder (1 Oil)...... 010" to .018" Clearance In Groove - (No.1) Compression Ring) ...... 0030" to .0045" Clearance In Groove - (No.2 & 3) Compression Rings ...... 0020" to .0035" Clearance In Groove - (Oil Ring) ...... 0010" to .0025"
CONNECTING RO'DS
Connecting Rod Running Clearance ...... , .001" to .002" Connecting Rod Side Clearance ...... 005" to .Oll" Connecting Rod Bushing for Piston Pin ...... Ream to .9995" to .9997" Connecting Rod Bearing ...... Copper Lead Lining, Steel Back Bearing Liner Width...... 1.120" to LBO" Inside Diameter of Bearing Liner (Standard Liner in Place and Bolts Tight)...... 2.0625" Undersize Bearing Liners Available for Service ...... 002", .020", .040"
S-6