Clarke C18 User Manual

46
Close the manual ball valves on the automatic and bypass side of the cooling loop to prevent raw water
from flowing through the cooling system.
NSR Tube Bundle Removal
Remove the Crossover End Cap
Locate the Crossover End Cap (reference figure 9-1 item 1)
Remove the Crossover End Cap bolts (qty 5).
Remove the Crossover End Cap (reference figure 9-1 item 1)
Remove the rubber O-Ring and dispose.
Remove the IO (In/Out) End Cap
Locate the IO End Cap (reference figure 9-1 item 2)
Remove the IO End Cap bolts (qty 5).
Remove the IO End Cap (reference figure 9-1 item 2)
Remove the rubber O-Ring and dispose.
Remove the tube bundle
Identify the 12 o-clock mark on the tube bundle header plate from the IO side of the assembly and
make note of its position.
Remove the tube bundle by sliding it out of the IO side of the assembly. (reference figure 9-1 item 3)
NSR Tube Bundle Cleaning
Clean the Tube Bundle
Submerge the tube in de-scaler for 30 minutes to 1 hour.
Inspect the inside of the tubes. If needed, use a cleaning rod and brush to clean the tubes.
Rinse tube bundle thoroughly with fresh water and let dry.
NSR Tube Bundle Installation
Install the Tube Bundle
Install the tube bundle from the IO side of the assembly. (reference figure 9-1 item 2)
Ensure the 12 o-clock marking is in the correct position, facing the IO side and not the crossover side.
Ensure the tube bundle is centered in the housing. Measure from the mating surface of the shell
assembly to the header plate. This measurement should be equal to the value in table 1. Note: The
header plate can float, ensure the header plate is flush with the cup.) Reference figure #9-1.
NSR Part Number
Description
Measurement
C053643
Standard Copper (Painted Endcaps)
5.5 mm
C053878
Copper Nickel (Bronze Endcaps)
6.0 mm
Table 1
Install the End Caps
IMPORTANT: Install the End Caps as described below, ensuring that the bundle does not shift from the
centered position. If the bundle moves at any point during end cap installation, remove the end cap
and repeat step 5.1.2 and 5.1.3 before attempting again.
Lubricate all surfaces of a new O-Ring (part number 0C12C979).
Install O-ring into Crossover side of the assembly. Ensure the O-ring is fully seated inside the groove.
Place the Crossover End Cap onto the shell assembly and finger tighten the 5 bolts in the assembly.
Lubricate all surfaces of a new O-Ring (part number 0C12C979).
Install O-ring into IO (In/Out) side of the assembly. Ensure the O-ring is fully seated inside the groove.
Place the IO End Cap onto the shell assembly and finger tighten the 5 bolts in the assembly
Hand tighten the 5 bolts on the Crossover End Cap assembly.
Hand tighten the 5 bolts on the IO End Cap assembly.
Properly torque the Crossover End Cap and IO End Cap Bolts to 31 FT-LBS in the sequence shown
below in figure #9-2.
Return to Normal Operation
Refill the engine coolant
Refill the engine coolant using Clarke Fire part number 0C054129 or Cool-Gard II part number
TY26575
Turn on the raw water supply
Return the manual ball valves on the automatic and bypass side of the cooling loop to the normal
position. IMPORTANT: Ensure the manual ball valves are in the normal position. Restricting raw water
flow to the cooling system will cause the engine to overheat.
Return the engine to normal operation

Clarke C18 Specifications

General

Brand	Clarke
Model	C18
Category	Engine
Language	English