Suzuki: Engine K6A-YH6. Service manual - part 18

 

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Suzuki: Engine K6A-YH6. Service manual - part 18

 

 

7-26

REPAIR

7

Installation

See Figures 7-65 through 7-67.

IMPORTANT

Make sure cylinder head and cylinder block are free 
of oil and debris.

Make sure cylinder head bolt holes are free of oil, 
water, or debris.

Figure 7-65

1.

Clean cylinder head and cylinder block mating 
surfaces. Place head gasket on cylinder block with 
forked end toward the front of the engine (arrow).

2.

Install cylinder head using care to align dowel pins.

3.

Apply oil to cylinder head cap screw threads and 
seating faces and install. Do not tighten at this time.

IMPORTANT

If the cylinder head, cylinder block, or the cylinder 
head cap screw have been replaced, go to step 4.

If installing previously removed parts, go to step 5.

Figure 7-66

4.

Torque the cap screws in sequence to 22 lb-ft (30 
N•m).

• Set torque wrench to 35 lb-ft (47 N•m) and repeat 

torque sequence.

• Reverse the torque sequence and loosen all cap 

screws.

• Re-torque cap screws in sequence to 35 lb-ft

 (47 N•m).

• Torque cap screws (1 through 8) in sequence to final 

specification.

Cylinder Head Cap Screw Torque: 43.5 lb-ft (59 N•m)

Figure 7-67

5.

Tighten cap screws (1 through 8) in sequence, to 
specification.

Cylinder Head Cap Screw Torque: 43.5 lb-ft (59 N•m)

TN0413

TN0403

1

2

3

4

5

6

7

8

TN0403

1

2

3

4

5

6

7

8

REPAIR

7-27

7

Valves

Disassembly

See Figure 7-68.

Figure 7-68

1.

Remove shims (1) and tappets (2).

2.

Using a valve spring compressor, remove retainer 
locks (8).

3.

Release valve spring compressor and remove
valve (5).

4.

Remove valve spring retainer (7), valve spring (3), 
valve seal (4), and valve spring seat (6).

5.

Inspect all parts for wear or damage. (See 
“Inspection” on page 7-28.)

Required Tools

Valve Spring Compressor

TN0492

6

8

1

5

3

4

2

7

7-28

REPAIR

7

Inspection

Valves

See Figure 7-69.

Figure 7-69

1.

Clean and inspect intake (5) and exhaust (4) valves, 
valve stems (3), valve stem tips (1), and retainer lock 
grooves (2).

2.

Using a micrometer, measure the valve stem (3) OD.

3.

Using an inside micrometer, measure the ID of valve 
guide.

Compare valve stem OD measurement to valve 
guide ID measurement. Calculate clearance and 
replace as needed.

Valve Guide to Valve Stem Clearance, Intake: 
0.0007—0.0018 in. (0.020—0.047 mm)

Valve Guide to Valve Stem Clearance Limit, Intake: 
0.002 in (0.07 mm)

Valve Guide to Valve Stem Clearance, Exhaust: 
0.0017—0.0028 in. (0.045—0.072 mm)

Valve Guide to Valve Stem Clearance Limit, Exhaust: 
0.003 in. (0.09 mm)

Valve Springs

See Figures 7-70 and 7-71.

Figure 7-70

Figure 7-71

1.

Measure the free length of valve springs using a 
veneer caliper (1). Compare measurement to 
specification. Replace as needed.

Valve Spring Free Length: 1.35 in. (34.3 mm)

TN0506

1

3

3

1

2

2

4

5

Required Tools

Veneer Caliper

Spring Compression Gauge

Square

TN0558, 0559

1

2

TN0760

3

4

REPAIR

7-29

7

2.

Using a spring compression gauge (2), compress the 
valve spring to 1.17 in. (29.9 mm). Compare the 
tension reading to specification and replace as 
needed.

Pound Force at 1.17 in. (29.9 mm) Height:

Valve Spring Tension Standard: 22—26 lb-ft
 (100—116 N•m)

Valve Spring Tension Limit: 20 lb-ft (88 N•m)

3.

Using a square (4), check valve spring right angle. 
Use a feeler gauge to measure distance (3). 
Compare measurement to specification. Replace as 
needed.

Valve Spring Right Angle Range: 0.000—0.059 in.
(0.00—1.5 mm) 

Installation Notes

Always use new O-rings, gaskets, and seals.

Apply clean engine oil to tappet and valve stem contact 
surfaces.

Install valve assemblies with new valve seals by reversing 
the order of removal.

Check valve clearance. (See “Valve Clearance Check 
and Adjustment” on page 5-3.)

 

 

 

 

 

 

 

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