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Disassembly, assembly and measurement methods and standard value parameters of Qianglu diesel engine cylinder head and valve seat


Detailed Description:

Disassembly, assembly and measurement methods and standard value parameters of Qianglu diesel engine cylinder head and valve seat

If bore dimensions are not within specification, machinehead to the following specifications: Exhaust Valve Seat Insert Bore Specifications:

A .................. 42.987—43.013 mm (1.6924—1.6934 in.)

B ................................ 3.82 mm (0.150 in.) Reference

C ................................ 9.936—10.064 mm (0.3912—0.3962 in.)

D ................................ 38--42 °

E ................................ Maximum Radius 0.5 mm (0.019 in.)

Maximum surface finish 0.00158 mmof bore “A” ....... (0.000062 in.)

Intake Valve Seat Insert Bore Specifications:

A .................. 47.104—47.130 mm (1.8545—1.8555 in.)

B ...................... 3.45 mm (0.136 in.) Reference

C ................................ 9.936—10.064 mm (0.3912—0.3962 in.)

D ................................ 38--42 °

E ................................ Maximum Radius 0.5 mm (0.019 in.)

Maximum surface finish 0.00158 mmof bore “A” ....... (0.000062 in.)

Replacement Valve Seat Insert OD:

Intake ......... 47.155--47.181 mm (1.8565--1.8575 in.)

Exhaust ............ 43.038—43.064 mm (1.6944—1.6954 in.)

Installation method of valve seat

1. Use JDG676 Valve Seat Driver (A) and JDG675 ValveSeat Insert Installing Adapter (B) to install valve seatinserts in cylinder head. Use one end of JDG675 Adapter to install intake valveseat inserts and the other end to install exhaust valveseat inserts.

2. Install valves and measure valve recess. (SeeMEASURE VALVE RECESS IN CYLINDER HEAD, early in this group.)

3. Grind valve seats as required to maintain correct valverecess and valve face-to-seat seal. (See GRINDVALVE SEATS, earlier in this group.)

A—Valve Seat Driver

B—Adapter

Valve installation method

1. Lubricate valve stems and guides with clean engine oil.

NOTE: Valves must move freely in guide and seatproperly in head to form an effective seal.

2. Insert valves in head (if valves are reused, install insame location from which removed).

3. Use JDG678 Valve Stem Seal Installer (A) to slidevalve stem seals (B) over valve stems and onto valveguide tower (C).

NOTE: JDG678 Installer may also be used to installoversize valve stem seals on oversize valvestems.

4. Install valve springs and rotators.

5. Compress valve springs using JDE138 Valve SpringCompressor (A) and install retainer locks (B) on valvestems.

6. Strike end of each valve three or four times with a softmallet (non-metallic) to insure proper positioning of theretainer locks.

7. Recheck valve recess. (See MEASURE VALVERECESS IN CYLINDER HEAD, earlier in this group.)

A—Spring Compressor

B—Retainer Locks

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