Caterpillar C-3406B / C-346 — Fuel Line Installation
Installation · Fuel lines and oil supply adapter
For the Caterpillar C-3406B / C-346, from the Caterpillar service manual.
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Before you start
- Do not bend fuel lines as fuel leakage may result.
Procedure
- If new fuel lines are used, install new O rings on the riser end and lubricate them with clean engine oil.
- Remove the protective caps and plugs from the nozzles and fuel lines.
- Install the fuel lines; first hand tighten the retainer nuts, then tighten with the Caterpillar fuel line socket wrench to 30 lbft (41 N·m).
- Check clearance between the fuel lines and the necked down portion of the mounting studs; 0.125 in minimum to 0.375 in maximum.
- Install the O ring on the oil supply adapter and place a small amount of grease on the adapter.
- Loosen and back out the slave piston adjusting screw until the slave piston is seated in its bore.
- Carefully install the brake housing, paying particular attention to oil supply adapter alignment.
- Install the Jacobs washer and the 3/8 inch capscrew through the housing into the support bracket; hand tighten only.
- Torque the support bracket bolt to 200 lbft (270 N·m), retorque to 330 lbft (450 N·m).
Tools required
- Caterpillar fuel line socket wrench (5P144) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Retainer nuts 30 lbft (41 N·m)
- Fuel line clearance 0.125 in (3.175 mm) min to 0.375 in (9.525 mm) max
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.