ALTERNATOR-PAD 3987794 - Caterpillar

Do not drive the gear on the camshaft.
3. Align holes in weights with dowels in gear and install the automatic timing advance.4. Align pin (3) in washer with hole (4) in camshaft and install washer (2).5. Install screw (1) and tighten to 70 5 lb. in. (7.9 0.6 N m). Stake screw in two places.
INSTALLING WASHER
2. Washer. 3. Pin. 4. Hole.
Stake screw (1) carefully. Heavy blows on washer or screw can force the shaft extension too far into the camshaft and eliminate all end clearance.
6. After screw (1) is staked, the gear and weight assembly requires .003 to .037 in. (0.08 to 0.94 mm) end clearance to prevent binding against the washer, camshaft end, or camshaft gear.
STAKING SCREW
1. Screw.Camshaft Bearings Removal And Installation
Remove camshaft bearings using the 1P5544 Washer (1) and S509 Bolt (2), from the 1P5545 Adapter Group, in conjunction with the 8S2241 Camshaft Bearing Removal and Installation Group, and the 8H684 Ratchet Box Wrench.
INSTALLING WASHER
1. 1P5544 Washer. 2. S509 Bolt.With removal tools installed on cylinder block, remove bearings.
REMOVING CAMSHAFT BEARINGSInstall camshaft bearing using the 1P5545 Adapter Group in conjunction with the 8S2241 Camshaft Bearing Removal and Installation Group, and the 8H684 Ratchet Box Wrench.
INSTALLING CAMSHAFT BEARINGSThe 1P5545 Adapter Group pilots in the camshaft bearing bore and also pilots the bearing into the bore. This insures bearing alignment. Install bearings from chamfered side of the bores and align oil hole in bearings with oil holes in the cylinder block.To install the camshaft front bearing, it is necessary to machine a notch in the 8S8289 Tube (3) for clearance of the boss that projects above the camshaft bearing bore. Machine the notch 1 1/2 in. (38.1 mm) wide, 3/8 in. (9.5 mm) deep, with a 1/8 in. (3.2 mm) radius or chamfer in the corners and on the edges.
NOTCH IN TUBE
3. 8S8289 Tube. 4. 8S8288 Cone. 5. Notch.Invert the 8S8288 Cone (4) and install it in the 8S8289 Tube (3) for installation of the camshaft front bearing.
INSTALLING CAMSHAFT FRONT BEARING
3. 8S8289 Tube. 4. 8S8288 Cone.Engine Test Procedure
Lubrication For A Rebuilt Engine
It is very important for a rebuilt engine to have "adequate" (needed) lubrication during the first seconds of operation. A "dry start" (without needed lubrication) on a rebuilt engine can cause bearing damage.When an engine is rebuilt with new parts, oil is put on each part as it is installed. This is generally enough lubrication for engine start-up. However, this lubrication may not be enough or may be lost if the rebuilt engine is placed in storage for any length of time.When a factory assembled short block assembly is installed, the oil used at the factory has to give this needed lubrication. However, the factory oil application can flow off the parts in a short block during storage or shipment. As a result, the parts in a rebuilt engine will not have "adequate" lubrication at start-up.To prevent the possibility of a "dry start" and bearing damage during the first seconds of running, use the 1P540 Flow