Corken 91 - Page 91

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2
3
4
5
4
5
4
5
4
5
6
Crosshead
assembly
7
8
9
7
Piston
Piston
Piston
XX
YY
Piston
Piston top dead center
Piston bottom dead center
Piston
Piston
XX
Piston top dead center
Piston bottom dead center
Piston
YY
Piston
Model D891 Piston Clearance
Model FD891 Piston Clearance
Appendix E—Parts Details for D891 and FD891 Piston
Piston—Bill of Materials
Piston Diameter 4.5" (11.43 cm)
Ref
No.
Part No. Description Qty.
1. 7002-025TP100A Screw (orlo, gr. 8, torque to 8 ft•lbs) 4
2. 3927 Piston cap 1
3.
2902 Shim washer (thick)
As
req.
2902-1 Shim washer (thin)
4. 1739 Piston rings 4
5. 1740 Expander ring 4
6. 3604 Lock nut (torque to 150 ft•lbs) 1
7. 3730 Thrust washer 2
8. 3925 Piston (4-1/2" diameter) 1
9.
3603 Shim washer (thick)
As
req.
3603 -1 Shim washer (thin)
10. 3812 Loctite tube (620, not shown) 1
Ref
No.
Assembly Number Assembly Name
11. 3925-X1 Piston assembly
Piston Clearance (Cold)
a
Model
Top (X )
Minimum
a
Top (X )
Maximum
a
Bottom (Y)
Minimum
b
Bottom (Y)
Maximum
b
D891
0.084"
(2.13 m m)
0.10 4"
(2.64 mm)
0.010"
(0.25 mm)
0.020"
(0.51 mm)
a
The distance from the bottom of the head to the top of the piston.
b
The distance from the bottom of the piston to the top of the packing barrel.
WARNING
CAUTION: Always relieve
pressure in the unit before
attempting any repairs.
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