Usage:
D9 Tractors;
594 Pipelayers;
D353 Industrial And Marine Engines;
G353 Natural Gas Engines
- SUPPLEMENT: 02/15/82
SERVICE MAGAZINE, JANUARY 11, 1982, PAGE 5. In the article, "Improved Head Gasket Has Larger Fire Ring To Decrease Fretting," some additional information is necessary. Add the note which follows after the sentence, "Two are necessary," in the ADAPTABLE AS.
NOTE: For an engine without spacer plates, check the part numbers of the cylinder liner.
If an engine has 8N9174 or 7N5681 Cylinder Liners, use the new 1W6440 Cylinder Head Gasket.
If an engine has either all 1S2587 Cylinder Liners or a combination of 1S2587 and 8N9174 or 7N5681 Cylinder Liners, two gaskets - the 8M2970 and 4S9155 Cylinder Head Gaskets - must be used together.
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Reference: Put a mark through the October 26, 1981 Service Magazine article, "Improved Head Gasket Has Larger Fire Ring To Decrease Fretting," on page 2. This article has added information.
Description of Change: A new cylinder head gasket, which has a larger fire ring, is used on the above products.
The wire used in the fire ring for the new gasket is 0.117 mm (.0046") larger in diameter than the wire in the former gasket.
Because of the larger fire ring, increased torque is necessary on the cylinder head bolts/nuts to keep the same load on the gasket body. The new torque is 470 ± 14 N·m (350 ± 10 lb ft); the former torque was 410 ± 14 N·m (300 ± 10 lb ft).
NOTE: For an engine without spacer plates, check the part numbers of the cylinder liner.
If an engine has 8N9174 or 7N5681 Cylinder Liners, use the new 1W6440 Cylinder Head Gasket.
If an engine has either all 1S2587 Cylinder Liners or a combination of 1S2587 and 8N9174 or 7N5681 Cylinder Liners, two gaskets - the 8M2970 and 4S9155 Cylinder Head Gaskets - must be used together.
Procedure For Engines With Spacer Plates
1. Put clean oil on the bolt threads.
2. Tighten bolts 1 through 20 in sequence to 307 ± 14 N·m (230 ± 10 lb ft). See Illustration 1.
3. Again, tighten bolts 1 through 20 in sequence to 470 ± 14 N·m (350 ± 10 lb ft).
4. Tighten bolts 21 through 25 in sequence to 100 ± 14 N·m (75 ± 10 lb ft).
5. Again, tighten (hand torque only) bolts 1 through 20 in sequence to 470 ± 14 N·m (350 ± 10 lb ft).
6. Again, tighten bolts 21 through 25 in sequence to 100 ± 14 N·m (75 ± 10 lb ft).
Illustration 1. Sequence to tighten bolts on engines with spacer plates.
Procedure For Engines Without Spacer Plates
1. Put clean oil on the stud threads.
2. Tighten the nuts in sequence of 1 through 20 to 307 ± 14 N·m (230 ± 10 lb ft). See Illustration 2.
Illustration 2. Sequence to tighten nuts on engines without spacer plates.
3. Again, tighten the nuts in the same sequence to 470 ± 14 N·m (350 ± 10 lb ft).
4. Again, tighten (hand torque only) the nuts in sequence to 470 ± 14 N·m (350 ± 10 lb ft).
Special Instruction, Form No. SEHS7990 has the new torque and sequences to tighten the nuts or bolts when the new gasket is used. The Special Instruction comes with the new gasket.