W 250 Pickup L6-359 5.9L DSL (1989)
CAUTION: Do not use bead blast to clean the pistons.
Soak the pistons in cold parts cleaner. Soaking the pistons overnight will usually loosen the carbon deposits.
CAUTION: Do not clean the pistons and rods in an acid tank.
Wash the pistons and rods in a strong solution of laundry detergent and hot water.
CAUTION: Do not use a ring groove cleaner and be sure not to scratch the ring sealing surface in the piston groove.
Clean the remaining deposits from the ring grooves with the square end of a broken ring.
