Page 19 - Mechanic Diesel - TP - Punjabi

Professional Overhaul & service 43 Perform Overhauling of cylinder head Diesel Engine Components
Skill; 160 Hrs; Diesel Engine, its assembly, Use of service manual for - Description and Constructional
parts and check
Professional functionality. 44 clearance and other parameters. feature of Cylinder head, Importance
Knowledge; (10hrs) of Cylinder head design,
25 Hrs
45 Perform practice on removing rocker - Type of Diesel combustion
arm assembly manifolds. (05hrs) chambers,

46 Perform practice on removing the - Effect on size of Intake & exhaust
valves and its parts from the cylinder passages, Head gaskets.
head, cleaning. (05hrs)
- Importance of Turbulence. Valves &
47 Inspection of cylinder head and Valve Actuating Mechanism -
manifold surfaces for warping, cracks - Description and Function of Engine
and flatness. Checking valve seats Valves, different types, materials,
& valve guide-Replacing the valve if
necessary. (05hrs) - Type of valve operating mechanism,
Importance of Valve seats, Valve
48 Check leaks of valve seats for seats inserts in cylinder heads,
leakage - Dismantle rocker shaft
assembly-clean & check rocker - Importance of Valve rotation, Valve
shaft - and levers, for wear and stem oil seals, size of Intake valves,
cracks and reassemble.(05hrs) Valve trains, Valve- timing diagram,
concept of Variable valve timing.
49 Check valve springs, tappets,
pushrods, tappet screws and valves - Description of Camshafts & drives ,
tem cap. Reassembling valve parts - Description of Overhead camshaft
insequence, refit cylinder head and (SOHC and DOHC), importance of
manifold & rocker arm assembly, Cam lobes, Timing belts & chains,
adjustable valve clearances, starting Timing belts & tensioners. (07hrs)
engine after adjustments. (10 hrs)

50 Perform Overhauling piston and - Description&functionsof different
connecting rod assembly. Use of types of pistons, piston rings and
service manual for clearance and piston pins and materials.
other parameters. (05 hrs)
- Used recommended clearances for
51 Perform Practice on removing oil the rings and its necessity
sump and oil pump - clean the sump. precautions while fitting rings,
(04 hrs) common troubles and remedy.
52 Perform removing the big end - Compression ratio.
bearing, connecting rod with the - Description & function of connecting
piston. (04 hrs)
rod,
53 Perform removing the piston rings; - importance of big- end split obliquely
Dismantle the piston and connecting
rod. Check the side clearance of - Materials used for connecting rods
piston rings in the piston groove & big end & main bearings. Shells
lands for wear. Check piston skirt and piston pins and locking methods of
crown for damage and scuffing, clean piston pins. (05 Hrs)
oil holes. (05 hrs)
54 Measure -the piston ring close gap
in the cylinder, clearance between
the piston and the liner, clearance
between crank pin and the
connecting rod big end bearing. (03
hrs)
55 Check connecting rod for bend and
twist. Assemble the piston and
connecting rod assembly. (04 hrs)

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