jcb 672 Service Manual Download

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15 - Engine

00 - General

15 - 11

9806/6900-3

15 - 11

Figure 8. Crankshaft pulley (front) end

Rocker cover

Cylinder head

Crankcase

Bedplate

Lubrication oil sump

Torsional vibration damper

FEAD (Front End Accessory Drive) tensioner

Starter motor

Alternator and drive pulley assembly

Twin thermostat

Turbocharger

Summary of Contents for 672

Page 1: ...ured if you operate or maintain the machine without first studying the Operator s Manual You must understand and follow the instructions in the Operator s Manual If you do not understand anything ask...

Page 2: ...stroke cycle The engine has 24 valves 2 inlet and 2 exhaust valves for each cylinder The crankshaft also drives a mechanical fuel injection pump via gears The pump injects fuel via injectors or atomi...

Page 3: ...15 Engine 00 General 00 General 15 4 9806 6900 3 15 4 Figure 3 1 Flywheel 2 Crankshaft 3 Camshaft 4 Inlet valves 12 off 5 Exhaust valves 12 off 6 Push rods 12 off 7 Turbocharger 8 Lubrication oil pump...

Page 4: ...As viewed on the right hand side Refer to Figure 4 Figure 4 1 Rocker assembly 2 Valve bridge piece 12 off 3 Valve bridge piece 12 off 4 Inlet valve 12 off 5 Exhaust valve 12 off 6 Piston assembly 6 of...

Page 5: ...Piston ring oil control 6 off 6d Gudgeon pin 6 off 6d Gudgeon pin circlip 12 off As viewed on the rear left side Refer to Figure 5 Figure 5 1 Flywheel 1a Flywheel crankshaft fixing bolts 8 off 2 Fuel...

Page 6: ...arts Notice Clean the engine before you start engine maintenance Obey the correct procedures Contamination of the fuel system will cause damage and possible failure of the engine Notice Do not exceed...

Page 7: ...3 6 2 4 Displacement 7 148 litres Compression ratio 18 1 Engine Compression see note 2 Direction of rotation viewed from front crankshaft pulley end Clockwise Valves 4 per cylinder Valve clearances me...

Page 8: ...engine assembly visible from the exterior Some variants may differ in detail Figure 6 Left hand Side A B C D E F G H J K L A Lubrication oil dipstick B Fuel injectors and high pressure fuel pipes C L...

Page 9: ...Timing gear case B Flywheel housing C Bedplate housing D Lubrication oil sump E Turbocharger F Exhaust manifold G Alternator H Coolant pump housing crankcase J Coolant inlet radiator hose connector K...

Page 10: ...pulley front end L K B J H F A C G D E A Rocker cover B Cylinder head C Crankcase D Bedplate E Lubrication oil sump F Torsional vibration damper G FEAD Front End Accessory Drive tensioner H Starter mo...

Page 11: ...General 00 General 15 12 9806 6900 3 15 12 Figure 9 Flywheel rear end G F D A B E C A Rocker cover B Cylinder head C Flywheel D Fuel injection pump gear access cover E Timing case F Inlet manifold G...

Page 12: ...H J K L A Inlet manifold B Oil cooler remote C FEAD belt tensioner D Torsional vibration damper E Coolant pump drive pulley F Lubrication oil sump G Oil drain plug sump H Starter motor assembly J Wate...

Page 13: ...ravels down the cylinder it draws filtered air at atmospheric pressure and ambient temperature through an air filter and inlet valves into the cylinder Compression When the piston reaches the bottom o...

Page 14: ...6900 3 15 15 Figure 11 3 2 4 1 B C 746030 1 Induction 2 Compression stroke 3 Power stroke 4 Exhaust stroke A Camshaft B Camshaft lobe Inlet valve operation C Camshaft lobe Exhaust valve operation BDC...

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