Wabco Air Compressors Caterpillar

Cylinder Head Installation For Wabco 250 cc Air Compressor

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Illustration 1	g00803448
250 cc Tightening Sequence

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Illustration 2	g00803524
(A) Leaf Valve

1. Align the hole in the new gasket (7) with the passage on the top of the crankcase. Place the new gasket (7) in position on the cylinder block of the air compressor.

   Ensure that the leaf valve (A) is in the proper position on the underside of the new cylinder head assembly (8). The two holes in the leaf valve (A) must be installed over the two pins on the base of the new cylinder head assembly (8). A light application of engine oil will hold the leaf valve (A) to the new cylinder head assembly (8) .

   Position the new cylinder head assembly (8) onto the new gasket (7). Install the new cylinder head bolt (1) through new cylinder head bolt (4) into the new cylinder head assembly (8) .

2. Tighten bolt (1) through bolt (4) in a numerical sequence to a torque of 15 N·m (11.0 lb ft).

3. Tighten bolt (1) through bolt (4) again in a numerical sequence to a torque of 25 N·m (18.5 lb ft).

4. Place an index mark on the head of bolt (1) through bolt (4) .

5. Rotate bolt (1) through bolt (4) in a numerical sequence.

   Rotate bolt (1) in a clockwise direction. ... 180 degrees ± 10 degrees

6. Rotate bolt (2) next.

   Rotate bolt (2) in a clockwise direction. ... 270 degrees ± 10 degrees

7. Rotate bolt (3) and bolt (4) in a numerical sequence.

   Rotate bolt (3) and bolt (4) in a clockwise direction. ... 180 degrees ± 10 degrees

8. Tighten bolt (5) and bolt (6) in a numerical sequence to a torque of 6 N·m (53.1 lb in).

9. Place an index mark on the head of bolt (5) and bolt (6) .

10. Rotate bolt (5) and bolt (6) in a numerical sequence.

    Rotate bolt (5) and bolt (6) in a clockwise direction. ... 90 degrees ± 5 degrees

Cylinder Head Installation For Wabco 318 cc Air Compressor

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Illustration 3	g00803524

1. Align the hole in the new gasket (10) with the passage on the top of the crankcase. Place the new gasket (10) in position on the cylinder block of the air compressor.

   Ensure that the leaf valve (A) is in the proper position on the underside of the new cylinder head assembly (11). The two holes in the leaf valve (A) must be installed over the two pins on the base of the new cylinder head assembly (11). A light application of engine oil will hold the leaf valve (A) to the new cylinder head assembly (11) .

   Place the new cylinder head assembly (11) onto the new gasket (10). Install the new cylinder head bolt (1) through new cylinder head bolt (4) into the new cylinder head assembly (11) .

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Illustration 4	g00803452

2. Tighten bolt (1) through bolt (4) in a numerical sequence to a torque of 25 N·m (18.5 lb ft).

3. Place an index mark on the head of bolt (1) through bolt (4) .

4. Rotate bolt (1) through bolt (3) in a numerical sequence.

   Rotate the bolts in a clockwise direction. ... 90 degrees ± 5 degrees

5. Rotate bolt (4) next.

   Rotate bolt (4) in a clockwise direction. ... 60 degrees ± 5 degrees

6. Tighten bolt (5) through bolt (9) in a numerical sequence to a torque of 6 N·m (53.1 lb in).

7. Place an index mark on the head of bolt (5) through bolt (9) .

8. Rotate bolt (5) through bolt (9) in a numerical sequence.

   Rotate bolt (5) through bolt (9) in a clockwise direction. ... 90 degrees ± 5 degrees