Detroit Diesel — Test #4: Fuel Pump Driven Gear Bolt Torque
Adjustments · Fuel pump drive gear
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Do not apply a torque over 30 N·m (22 lb·ft). Excessive torque can cause bolt/gear failure.
Procedure
- Remove the fuel pump.
- Set a clicker-type torque wrench to 30 N·m (22 lb·ft).
- Turn the torque wrench until it clicks; NO resistance with shaft turning freely indicates further checks needed.
- Remove the crankshaft vibration damper, idler pulley, air conditioner compressor pad and camshaft gear cover.
- Remove the bolt and use a puller to remove the gear.
- Check the mounting between bolt, gear, and shaft; replace damaged parts.
- Install gear and bolt, apply Loctite 271 to threads, use locking device J-46187, torque to 35 N·m (26 lb·ft).
- Install camshaft front cover and secure with eight bolts to 50 N·m (37 lb·ft).
- Install the fuel pump and a new gasket; torque fuel pump bolts to 25 N·m (18 lb·ft).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Clicker check 30 N·m (22 lb·ft)
- Gear bolt 35 N·m (26 lb·ft)
- Cover bolts 50 N·m (37 lb·ft)
- Fuel pump bolts 25 N·m (18 lb·ft)
Source: Detroit Diesel 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.