3500B and 3500 Marine Propulsion Engines with EUI Option Belts - Inspect/Adjust/Replace Caterpillar


Belts - Inspect/Adjust/Replace
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3500B and 3500 Marine Propulsion Engines with EUI Option [SEBU6917]
BASIC ENGINE
SERPENTINE/V-BELTS
3500B and 3500 Marine Propulsion Engines with EUI Option Belts - Inspect/Adjust/Replace
1.1. Inspection
2.1. Replacement
3.1. Alternator Belt Adjustment

Inspection

Inspect the alternator belt and any accessory belts for wear and for cracking. Replace the belts if the belts are not in good condition.

Check the belt tension according to the information in the Service Manual, "Specifications".

Slippage of loose belts can reduce the efficiency of the driven components. Vibration of loose belts can cause unnecessary wear on the following components:

  • Belts

  • Pulleys

  • Bearings

If the belts are too tight, unnecessary stress is placed on the components. This reduces the service life of the components.

Replacement

For applications that require multiple drive belts, replace the drive belts in matched sets. Replacing one drive belt of a matched set will cause the new drive belt to carry more load because the older drive belts are stretched. The additional load on the new drive belt could cause the new drive belt to fail.

Alternator Belt Adjustment



Illustration 1g00960176
(1) Adjusting nuts
(2) Mounting bolt
(3) Mounting bolt
(4) Mounting bolt

  1. Remove the drive belt guard.

  2. Loosen mounting bolts (2), (3), and (4). Loosen adjusting nuts (1).

  3. Turn adjusting nuts (1) in order to increase or decrease the drive belt tension.

  4. Tighten adjusting nuts (1). Tighten mounting bolts (2), (3), and (4).

  5. Reinstall the drive belt guard.

If new drive belts are installed, check the drive belt tension again after 30 minutes of engine operation at the rated rpm.

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