Series 50 – Section 6.4 Closed Crankcase Breather for S50g Automotive Engines (1998 and Later)

Section 6.4
Closed Crankcase Breather for S50g Automotive Engines (1998 and Later)

Closed breathers are required for natural gas automotive engines in 1998. The S50G engine uses a remote mount Racor® CV4500 crankvent breather/filter. See Figure "Crankvent" .‪

Figure 1. Crankvent

The crankvent contains a coalescing filter to remove liquid from the blowby gas. The liquid that is coalesced from the blowby is drained back to the ground. The blowby gas is routed out of the rocker cover, through the filter element and returns to the inlet side of the turbo. ‪

Section 6.4.1
Replacement of the Closed Crankcase Breather

The crankvent coalescing filter is a nonservicable component but should be changed in conjunction with oil service intervals. Refer to "13.6.3 Closed Crankcase Breather System" .‪

Section 6.4.2
Removal of Closed Crankcase Breather

Remove the closed crankcase breather as follows:‪

1. Release latches on the side of the breather assembly and lower canister away from the assembly.
2. Remove the filter from the assembly.
3. Dispose of the used filter in an environmentally responsible manner.
4. Clean the filter canister with a clean lint-free cloth.

Section 6.4.3
Installation of the Closed Crankcase Breather

Install the closed crankcase breather as follows:‪

1. Insert new filter into the top of the assembly, ensuring the new filter contains the top O-ring. See Figure "Location of O-ring and Breather Filters" .
   

   Figure 2. Location of O-ring and Breather Filters

2. Replace the lower canister ensuring the larger O-ring is secure in the top half of the assembly.
3. Secure the latches on the side of the can.
4. There are two O-rings in the system. One on the filter element itself and one that seals between the lower canister and the upper body. Ensure both O-rings are secure before reassembling the crankvent.