ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 005-081   Snubber, Rate Shape

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Thoroughly steam-clean the rate shape tube and fuel pump area.

Dry with compressed air.

Remove the rate shape tube assembly. Refer to Procedure 005-090.

Remove the rate shape snubber assembly.

Use a center punch to pry the seal disc from the accumulator.

The parts in the assembly are as shown:

1. Snubber valve seat
2. Spring
3. Rate shape snubber body
4. Seal disc
5. Snubber valve
6. Spring post.

Replace the snubber assembly if the snubber spring is broken.

Do not reuse snubber seal discs.

Early design snubber valves are not reusable.

1. Part Number 3800351, first snubber valve assembly released for CAPS (one groove, not reusable)
2. Part Number 3800764, second snubber valve assembly released for CAPS (two grooves, not reusable)
3. Part Number 4010544, current snubber valve assembly released for CAPS (no grooves, may be reused); always replace the seal disk.

Clean the bore for the distributor outlet fitting with QD cleaner prior to installation of the new snubber assembly.

Install a new seal disc into the accumulator.

Apply lubricating oil to the face of the snubber seat and to the face and threads of the snubber fitting.

Install the snubber assembly.

Install the rate shape tube assembly. Refer to Procedure 005-090.

Operate the engine and check for leaks.