NOTE: No washers are allowed under the head of the bolt.

(2)  
Install from zero to two thinner washers as needed.

(3)  
Install the thicker washer (required) next to the nut and install the nut.

(4)  
Tighten nut to obtain 660-980 pound-inches.

(5)  
Install new cotter pin.

F.  Install power plant (Ref 71-00).
5B3 
Aug 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-21-21 Page 401 

Aft Cone Bolt Installation  5E4 
71-21-21Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/95 

FORWARD VIBRATION ISOLATORS - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Grease - MIL-G-23827
2.  Remove Forward Vibration Isolators
A.  Remove power plant. Refer to 71-00, Power Plant (JT8D) - Removal/Installation.
B.  Remove six nuts, washers, and bolts attaching vibration isolator cover plate and fixed fairing support bracket to forward engine mount support fitting (Fig. 401).
C.  Remove fixed fairing support bracket and vibration isolator cover plate.
D.  Remove vibration isolator.
3.  Install Forward Vibration Isolators
A.  Coat vibration isolator cover plate attach bolts, and mating holes in cover plate, fixed fairing support bracket, and forward engine mount support fitting with grease (Fig. 401).
B.  Position vibration isolator in forward engine mount support fitting and rotate isolator until projection on isolator enters mating hole in fitting.
C.  Position cover plate over vibration isolator with mounting holes aligned with mating holes in forward engine mount support fitting.
D.  Position fixed fairing support bracket on cover plate and install six attach bolts, washers, and nuts as shown on Fig. 401. Tighten nuts to 130 to 180 pound-inches.
E.  Install power plant. Refer to 71-00, Power Plant (JT8D) - Removal/Installation.
500 
Nov 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-22-11 Page 401 

71-22-11Page 402  Forward Vibration Isolators Installation  Figure 401  500 Nov 15/67 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FORWARD CONE BOLTS - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Grease - MIL-G-23827
B.  Spring scale
2.  Remove Forward Cone Bolts (Fig. 401)
A.  Remove power plant (Ref 71-00, Power Plant (JT8D) - R/I).
B.  Remove nut, washers, bolt and countersunk washer securing cone bolt to engine forward mount ring. Remove cone bolt.
3.  Install Forward Cone Bolts (Fig. 401)
A.  Ensure that cone bolt to be installed is approved for 737 use. The preferred forward cone bolt is BAC10-60517-49 (shot peened). Cone bolts BAC10-60157-43 (uncoated) and BAC10-60157-39 (coated) are also used. Cone bolt BAC10-60517-39 (coated) should be reworked to BAC10-60517-43 by removing Dri-Lube coating.
CAUTION:  ONLY APPROVED CONE BOLTS HAVE THE CORRECT STRUCTURAL FUSE CHARACTERISTICS.
B.  Check that cone bolt attach bolt has a chrome plated shank.
C.  Coat cone bolt attach bolt and mating holes with grease.
D.  Install countersunk washer on attach bolt with countersunk face mating bolthead radius (facing underside of bolthead).
E.  Position cone bolt between flange lugs of engine forward mount ring.
F.  Insert attach bolt (with installed countersunk washer) through holes in flange lugs of engine mount ring and hole in cone bolt. Bolt may be installed with bolthead forward or aft.
G.  Loosely install two washers and nut on attach bolt.
CAUTION:  ENSURE THE RUN-ON TORQUE FOR NUT IS A MINIMUM OF 50 LB-IN. A FAILURE TO MEET THIS REQUIREMENT COULD RESULT IN LOSS OF NUT DURING ENGINE OPERATION AND DAMAGE TO ADJACENT MOUNTING STRUCTURE.
H.  Using spring scale, determine that cone bolt rotates freely on attach bolt when a force of less than 10 pounds is applied at cone bolt threaded end.
I.  Check that end play of cone bolt between engine flange lugs does not exceed 0.005 inch total.
CAUTION:  END PLAY IN EXCESS OF 0.005 INCH CAN RESULT IN OVERSTRESSING OF THE ENGINE FLANGES WHEN THE CONE BOLT ATTACH BOLT IS TIGHTENED TO FINAL TORQUE.
J.  Tighten nut on attach bolt until a force of 20 to 25 pounds applied at threaded end of cone bolt is required to rotate cone bolt about attach bolt. The resultant torque shall not exceed 1000 pound-inches.
K.  Install power plant (Ref 71-00, Power Plant (JT8D) - R/I).
500 
　
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