Positive Crankcase Ventilation Valve (Pcv); Changing - MerCruiser 4.3 TKS User Manual

Section 5 - Maintenance
2. Remove the flame arrestor.
e
d
c
3. Clean the flame arrestor with warm water and a mild detergent.
4. Inspect the flame arrestor for holes, cracks, or deterioration. Replace if necessary.
5. Allow the flame arrestor to air dry completely before use.
6. Clean the crankcase ventilation hose with warm water and a mild detergent. Dry with compressed air or allow to air dry
completely.
7. Inspect the crankcase ventilation hose for cracks or deterioration. Replace if necessary.
8. Install the flame arrestor, sealing washer, and locknut. Torque the flame arrestor locknut to specification.
Description
Flame arrestor nut
9. Connect the crankcase ventilation hose to the fitting on the flame arrestor and valve cover.

Positive Crankcase Ventilation Valve (PCV)

Changing

NOTE: We recommend the use of Mercury MerCruiser replacement parts to ensure compliance with emission regulations.
NOTE: On V6 models the PCV valve is non‑serviceable and is an internal component of the valve cover.
1. Remove the PCV valve from the port valve cover.
a
2. Disconnect the PCV valve from the hose and discard the valve.
3. Install a new PCV valve in the valve cover and reconnect the hose.
4. Ensure the PCV valve is tightly seated in the valve cover.
Page 58
a
a - Locknut
b
b - Sealing washer
c - Typical carburetor
d - Crankcase ventilation hose
e - Flame arrestor
16330
Nm
a - PCV valve
b - Hose
b
mc71925-1
90-8M0053372
lb‑in. lb‑ft
12 106
NOVEMBER 2010
eng