Step 4, Carbon Build-Up, Removing

Based on your diagnosis during step 2 (page 3), select one of the following service solutions.


Minor build-up

If minor carbon build-up has been diagnosed:

- add one 20 oz. bottle of Autobahn Gasoline additive (P/N ZVW 246 001) to a full tank of fuel


Note

To completely remove minor carbon deposits from the intake valves, the customer should be advised to repeat the fuel additive application two consecutive times. (One 20 oz. bottle per tank full.)


CAUTION

Do NOT exceed more than four applications without changing the engine oil. Follow the recommanded oil change instructions on the back of the bottle.


Step 4 (Minor Build-up)
Suggested Repair Time: N/A


CAUTION

Part numbers are for reference only. Always check with your Parts Department for latest information.
Heavy build-up


If heavy carbon build-up has been diagnosed, remove the build-up mechanically using one of the following methods:

A.

- remove cylinder head and intake valves
- mechanically remove carbon build-up
- re-install cylinder head, refer to Repair Manual for torque values

Step 4 (Heavy build-up)
Labor Operation: 1560 550
Suggested Repair Time: 275 t.u. or

B.

- remove carbon build-up using Walnut Shell Blaster US 37445, (follow manufacturers instructions)


Step 4 (Heavy build-up)
Labor Operation: 1560 558
Suggested Repair Time: 200 t.u.