強鹿柴油機活塞組件的拆卸技術方法

1. Remove piston rings using the JDE135 (shown),JDE85, or KJD10140 Piston Ring Expander.

2. Remove and discard piston pin snap rings.

3. Separate piston and rod. Keep these parts in placewith their respective cylinder liner.

John Deere約翰迪爾強鹿柴油機活塞環槽磨損的檢查與標準值參數

Pistons with tapered rods will use JDE62 Ring Groove Wear Gauge and pistons with straight rods will use JDG957 Ring Groove Wear Gauge.

1. Use the appropriate ring groove wear gauge (C) to check wear of keystone ring groove (top groove). Check grooves at several locations around the circumference of piston. Gauge shoulders should not contact ring land. Clearance (D) between shoulders of tool and ring land indicate ring groove is good. If ring groove is worn, replace piston and liner as a matched set. If ring groove is good, proceed to next step.

A—Piston with Good Keystone Ring Groove

B—Piston with Worn Keystone Ring Groove

C—Ring Groove Wear Gauge

D—Clearance (Normal)

E—No Clearance (Replace)

2. Check second (Compression) ring groove using new piston ring and a feeler gauge. Measure clearance at several points. Compare measurements with specifications.

3. Check third (Oil Control) ring groove using proper new piston ring and a feeler gauge. Measure clearance at several points. Compare measurements with specifications.

Specification

Piston Ring-to-Groove

Clearance—New Piston Ring

(Second Compression Ring

Groove)—Maximum Clearance.................................. 0.20 mm (0.008 in.)

Piston Ring-to-Groove

Clearance—New Piston Ring

(Third Oil Control Ring Groove,

Standard Ring)—Maximum

Clearance ................................................................... 0.82 mm (0.032 in.)

Piston Ring-to-Groove

Clearance—New Piston Ring

(Third Oil Control Ring Groove,

Heavy Duty Ring)—Maximum

Clearance ................................................................... 0.15 mm (0.006 in.)

4. Replace piston and liner (as a set) if clearance exceeds specification.

John Deere約翰迪爾強鹿柴油機活塞銷孔的測量與標準值參數

Measure piston pin bore. If bore is not within specification, replace piston and liner set.

Specification

Piston Pin Bore (Small Pin)—ID 34.935—34.945 mm (1.3754—1.3758 in.)

Piston Pin Bore (Large Pin)—ID 41.285—41.295 mm(1.6254—1.6258 in.)

活塞裙的測量與標準值參數

1. Measure piston skirt (A) 90° to piston pin bore and 28 mm (1.1 in.) from bottom of piston (B). Record measurement.

Specification

Piston Skirt (Measurement Taken at Bottom of Skirt 28 mm [1.1 in.]

from Bottom of Piston)—Diameter 106.38—106.40 mm (4.188—4.189 in.)

2. Measure cylinder liner as directed later in this groupand compare with piston measurement.

活塞的高度的測量與標準值參數

Measure piston height from center of piston pinbore-to-top of piston.

Piston (Two Valve Head Engines)—Specification

Piston—Height (Measured fromCenter of Pin Bore to Top ofPiston) 71.64—71.70 mm (2.820—2.823 in.)

Piston (Four Valve Head Engines)—Specification

Piston—Height (Measured fromCenter of Pin Bore to Top ofPiston) 71.60—71.65 mm(2.819—2.820 in.)