ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 008-057   Sea Water Pump

Inspect the sea water pump for evidence of water or oil, indicating seal leakage. If seal leakage is evident, the pump must be repaired or replaced.

CAUTION  Zinc plugs expand and can break off during removal. Inspect the zinc plug to make sure it is in one piece. Refer to Procedure 008-059. If not, it must be replaced with a new zinc plug, and the broken pieces must be retrieved from the aftercooler to prevent damage to components downstream in the sea water system.

Shut off the sea water supply.

Drain the sea water pump by removing the zinc plug from the aftercooler on QSL engines. Refer to Procedure 010-005. On QSC engines, remove the plug at the bottom of the marine gear oil/fuel cooler assembly.

Remove the cover from the back of the sea water pump.

Inspect the cover for signs of grooves worn into the cover surface.

Inspect the impeller for missing, badly worn vanes, or chunks of vanes missing.

If the cover is badly grooved or the impeller is badly damaged, the pump must be repaired or replaced. See the Repair step in this procedure for replacing the sea water pump impeller without removing the pump from the engine.

If the impeller is damaged, the sea water circuit down stream (marine gear oil cooler, fuel cooler, aftercooler and aftercooler element) of the pump must be checked and cleaned.

Inspect the cover o-ring for cuts or other damage.

Install the cover on the back of the pump with the three mounting capscrews.

CAUTION  If the impeller has failed and pieces are missing, all pieces must be retrieved. The engine heat exchanger, marine gear oil cooler, marine gear oil cooler and fuel cooler assembly, and sea water aftercooler must be flushed. Refer to procedures 008-053, 008-041, 008-129, and 010-005 for flushing these components. Failure to do so can result in overheating and damage to engine can occur.

Impeller debris can also drop into the inlet piping. Make sure all debris is removed before installing a new impeller; otherwise, additional impeller failures or engine overheating will occur.

CAUTION  Zinc plugs expand and can break off during removal. Inspect the zinc plug to make sure it is in one piece. Refer to Procedure 008-059. If not, it must be replaced with a new zinc plug, and the broken pieces must be retrieved from the aftercooler to prevent damage to components downstream in the sea water system.

Shut off the sea water supply.

Drain the sea water pump by removing the zinc plug from the aftercooler on QSL engines. Refer to Procedure 010-005. On QSC engines, remove the plug at the bottom of the marine gear oil/fuel cooler assembly.

Remove the cover from the back of the sea water pump.

Use a small screwdriver to remove the o-ring (A).

Use a small screwdriver to remove the inner cap (B), if equipped.

Clean the o-ring groove.

CAUTION  Do not pry against the pump housing to remove the impeller as this can cause damage to the liner.

Be sure to note the direction of impeller vanes for proper re-installation. Mark the outer surface.

An impeller removal tool is available from Sherwood Pumps, Part Number 23631.

If the impeller is equipped with a threaded insert, use the special tool or a ¾-NFT bolt (1) to insert in the impeller to pull the impeller out.

If the impeller does not have a threaded bore, grasp the hub of the impeller with pliers and remove the impeller from the impeller bore.

Inspect for damage such as rips, tears, chunks of material missing, or wear on the edges of the vanes.

Replace the impeller if damage is found.

Clean the internal pump surfaces.

Lubricate the housing with silicone or glycerine non-petroleum-based lubricant. Petroleum-based lubricant will damage the rubber impeller.

If non-petroleum-based lubricant is not readily available, use soapy water to ease installation.

If the impeller is in good shape and will be reused, install it in the same direction from which it was removed. See the mark you made during removal.

If the impeller was not marked and the original rotation or direction can not be determined, replace the impeller with a new one.

An oil filter strap wrench or even plastic wire straps can be used as an installation aid to hold the vanes.

Guide the impeller into the housing, twisting it counterclockwise as it is advanced so that the vanes will be deflected in the proper direction.

Continue to turn the impeller while pushing it into the housing. It will slide all the way in when the keyway lines up with the key.

Insert the new o-ring into the impeller housing. Use a light coat of silicone grease to hold the o-ring in place.

Install the rubber impeller cap into the center hub of the impeller, if equipped.

Install the cover plate and capscrews.

Tighten the capscrews.

CAUTION  Zinc plugs expand and can break off during removal. Inspect the zinc plug to make sure it is in one piece. If not, it must be replaced with a new zinc plug, and the broken pieces must be retrieved from the aftercooler to prevent damage to components downstream in the sea water system.

• Shut off the sea water supply. Refer to the OEM service manual.
• Drain the sea water system by removing the zinc plug from the bottom of the aftercooler of QSL engines. Refer to Procedure 010-005. On QSC engines, remove the plug at the bottom of the marine gear oil/fuel cooler assembly.

Remove the upper and lower water connections from the sea water pump.

Remove the o-rings.

Remove the sea water pump mounting capscrews.

Remove the sea water pump.

Inspect the pump for cracks, leakage points or other exterior damage.

Remove the rear cover and inspect the impeller.

Repair or replace the sea water pump if damage is found.

Inspect the water inlet and outlet connection o-rings. Replace if damaged.

NOTE: If a new sea water pump is being installed, the sea water pump must be painted before installation.

Install the sea water pump.

Install the sea water pump mounting capscrews and tighten.

Install the o-rings onto the water inlet and outlet connections. Use a light coat of silicone grease to hold the o-rings in place.

Install the upper and lower water connections from the sea water pump.

Install the capscrews and tighten.

• Install the zinc plug in the aftercooler on QSL engines. Refer to Procedure 010-005. On QSC engines, install the plug in the bottom of the marine gear oil/fuel cooler assembly.
• Open the sea water supply.

Operate the engine and check for leaks.