Isuzu KB P190. Manual - part 1201

7C-26  CLUTCH 

  INSPECTION AND REPAIR 

Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during 
inspection. 
 
 

 

 
 

PRESSURE PLATE ASSEMBLY 

Visually inspect the pressure plate friction surface for 
excessive wear and heat cracks. 
If excessive wear or deep heat cracks are present, the 
pressure plate must be replaced. 
 

 

 

Pressure Plate Warpage 

Use a straight edge and a feeler gauge to measure the 
pressure plate friction surface flatness in four directions. 
If any of the measured values exceed the specified limit, the 
pressure plate must be replaced. 
Pressure Plate Warpage 

mm(in)

Limit 

0.3 (0.012) 

 

 

 
 

Clutch Cover 

Visually inspect the entire clutch cover for excessive wear, 
cracking , and other damage. 
The clutch cover must be replaced if any of these conditions 
are present. 
 

 

 

 

 
 

1.  Abrasion, scratches, cracks and deflection of friction face to

the disc, loose rivet and wear of ring 

•  Grind small scratches, or replace the assembly if extreme 

scratches are found. 

 

CLUTCH  7C-27 

 

 

 

 

RTW67CSH000101 

 

 

Clutch Set Force 

1.  Invert the pressure plate assembly. 

2.  Place a metal sheet “A” on the pressure plate. 

3.  Compress the pressure plate assembly until the distance 

“B” becomes specified. 

Thickness and Distance 

mm(in)

 

 A B 

4JJ1 (High Output) 

(MUX) 

8.3 (0.327) 

12 (0.472) 

4JA1-T (MSG) 

7.8 (0.307) 

20 (0.787) 

4J series (MUA) 

7.8 (0.307) 

18 (0.709) 

C24SE (MUA) 

8.0 (0.315) 

7.9 (0.311) 

4.  Note the pressure plate gauge reading. 

Driven Plate Clamping Load 

N (kg/Ib)

 

 Standard 

4JJ1 (High Output) (MUX) 

6860 (700/1544) 

4JA1-T (MSG) 

5070 (517/1140) 

4J series (MUA) 

6300 (642/1415) 

C24SE (MUA) 

5500 (561/1237) 

 

RTW37CSH000101 

Diaphragm Spring Finger Height 

1.  Place a new driven plate or the appropriate spacer beneath 

the pressure plate. 

2.  Fully compress the pressure plate and diaphragm spring.

There are two ways to do this. 

•  Use a bench press to press down on the assembly from the

top. 

•  Tighten the fixing bolts. 
NOTE: Preload on diaphragm spring finger must be 49 - 98 N 
(11 - 22 lb) in direction of release, when clutch cover assembly 
is bolted to the flywheel.  
 

7C-28  CLUTCH 

 

 

3.  Measure the spring height from base to spring tip "H". If the 

measured value exceeds the specified limit, the pressure 

plate assembly must be replaced. 

Spacer Thickness 

mm(in)

 

 A B 

4JJ1 (High Output) 

(MUX) 

8.3 (0.327) 

12 (0.472) 

4JA1-T (MSG) 

7.8 (0.307) 

20 (0.787) 

4J series (MUA) 

7.8 (0.307) 

18 (0.709) 

C24SE (MUA) 

8.0 (0.315) 

7.9 (0.311) 

Finger Height: 

H

 

 

4JJ1 (High Output) (MUX) 

49.9-51.9 (1.96-2.04) 

4JA1-T (MSG) 

31-33 (1.22-1.30) 

4J series (MUA) 

39-41 (1.54-1.61) 

C24SE (MUA) 

39-41 (1.54-1.61) 

 

CLUTCH  7C-29 

 

RTW77CSH000301 

Release Bearing (MUX) 

1.  Visually check the release bearing for excessive play, noise

and breakage. 

2. If any of these conditions are discovered, the release

bearing must be replaced. 

3.  Apply molybdenum disulfide grease to the areas shown in

illustration. 

201RW010-X 

 

4.  When replacing the release bearing (3), replace both the 

wedge collar (2) and wire ring (1) at the same time. 

201RS013 

Wedge Collar 

1. Visually check the surfaces of the wedge collar making

contact with the release bearing for excessive wear and

damage.  

2.  Replace any exhibiting excessive wear or damage. 

 

RTW77CSH000701 

Shift Fork 

1.  Visually check the surfaces of the shift fork making contact

with the release bearing for excessive wear and damage. 

2.  Remove any minor stepping or abrasion from shift fork with 

an oil stone. 

3.  Replace any exhibiting excessive wear or damage. 

4.  Apply molybdenum disulfide grease to the pin hole inner

circumferences and thrust surfaces. 

 

 

 

RTW57CSH000401 

 

Release Bearing (MSG, MUA) 

1.  Visually inspect the surfaces of the release bearing making 

contact with the shift fork for excessive wear and damage.

 

Replace any exhibiting excessive wear or damage. 

2.  Apply multi-purpose type grease (NLGI No.2 or No.3) to 

contact surface between the release bearing and the shift 
fork. (Do not apply grease to the sleeve inner face.)