DODGE RAM SRT-10 2006 Service Repair Manual

VA LV E - P C V
DESCRIPTION
3.7L V-6 / 4.7L V-8
The 3.7L V-6 and 4.7L V-8 engines are equipped with
a closed crankcase ventilation system and a Positive
Crankcase Ventilation (PCV) valve (6).
This system consists of:
a PCV valve mounted to the oil filler housing.
The PCV valve is sealed to the oil filler housing
with an o-ring.
the air cleaner housing
two interconnected breathers (1) threaded into
the rear of each cylinder head.
tubes and hoses to connect the system
components.

5.7L V-8
The 5.7L V-8 engine is equipped with a closed crank-
case ventilation system and a Positive Crankcase
Ventilation (PCV) valve (4).
This system consists of:
a PCV valve mounted into the top of the intake
manifold, located to the right / rear of the throttle
body. The PCV valve (1) is sealed to the intake
manifold with 2 o-rings (2).
passages in the intake manifold.
tubes and hoses to connect the system
components.

OPERATION
A typical enclosed crankcase ventilation system is
shown in the graphic.
The PCV system operates by engine intake manifold
vacuum. Filtered air is routed into the crankcase
through the air cleaner hose. The metered air, along
with crankcase vapors, are drawn through the PCV
valve (4) and into a passage in the intake manifold.
The PCV system manages crankcase pressure and
meters blow by gases to the intake system, reducing
engine sludge formation.
The PCV valve contains a spring loaded plunger. This
plunger meters the amount of crankcase vapors
routed into the combustion chamber based on intake
manifold vacuum.
When the engine is not operating or during an engine
pop-back, the spring forces the plunger back against
the seat. This will prevent vapors from flowing through
the valve.
During periods of high manifold vacuum, such as idle
or cruising speeds, vacuum is sufficient to completely
compress spring. It will then pull the plunger to the top
of the valve. In this position there is minimal vapor
flow through the valve.

During periods of moderate manifold vacuum, the
plunger is only pulled part way back from inlet. This
results in maximum vapor flow through the valve.
DIAGNOSIS AND TESTING
PCVVALVE-3.7LV-6/4.7LV-8
1. Disconnect PCV line/hose (5) by disconnecting rub-
ber connecting hose at PCV valve fitting.
2. Remove PCV valve at oil filler tube by rotating PCV
valve downward until locating tabs (2) have been
freed at cam lock (3). After tabs have cleared, pull
valve straight out from filler tube.To prevent dam-
age to PCV valve locating tabs, valve must be
pointed downward for removal. Do not force
valve from oil filler tube.
3. After valve is removed, check condition of valve
O-ring (1). Also, PCV valve should rattle when
shaken.
4. Reconnect PCV valve to its connecting line/hose.
5. Start engine and bring to idle speed.
6. If valve is not plugged, a hissing noise will be
heard as air passes through valve. Also, a strong
vacuum should be felt with a finger placed at valve
inlet.
7. If vacuum is not felt at valve inlet, check line/hose
for kinks or for obstruction. If necessary, clean out
intake manifold fitting at rear of manifold. Do this
byturninga1/4inchdrill(byhand)throughthefittingtodislodgeanysolid particles. Blow out the fitting with
shop air. If necessary, use a smaller drill to avoid removing any metal fromthe fitting.
8.Do not attempt to clean the old PCV valve.
9. Return PCV valve back to oil filler tube by placing valve locating tabs (2) into cam lock (3). Press PCV valve in
and rotate valve upward. A slight click will be felt when tabs have engaged cam lock. Valve should be pointed
towards rear of vehicle.
10. Connect PCV line/hose (5) and connecting rubber hose to PCV valve.
11. Disconnect rubber hose from fresh air fitting at air cleaner resonatorbox. Start engine and bring to idle speed.
Hold a piece of stiff paper (such as a parts tag) loosely over the opening of the disconnected rubber hose.

12. The paper should be drawn against the hose opening with noticeable force. This will be after allowing approx-
imately one minute for crankcase pressure to reduce.
13. If vacuum is not present, disconnect each PCV
system hose at top of each crankcase breather
(1). Check for obstructions or restrictions.
14. If vacuum is still not present, remove each PCV
system crankcase breather (1) from each cylinder
head. Check for obstructions or restrictions. If
plugged, replace breather. Tighten breather to 12
Nꞏm (106 in. lbs.) torque. Do not attempt to clean
breather.
15. If vacuum is still not present, disconnect each
PCV system hose (1) at each fitting, and at each
check valve (2). Check for obstructions or
restrictions.

REMOVAL
3.7L V-6 / 4.7L V-8
The PCV valve (6) is located on the oil filler tube (4).
Two locating tabs are located on the side of the valve
(2). These 2 tabs fit into a cam lock (3) in the oil filler
tube. An O-ring (1) seals the valve to the filler tube.
1. Disconnect PCV line/hose (5) by disconnecting rub-
ber hose at PCV valve fitting.
2. Remove PCV valve at oil filler tube by rotating PCV
valve downward (counter-clockwise) until locating
tabs (2) have been freed at cam lock (3). After tabs
have cleared, pull valve straight out from filler tube.
To prevent damage to PCV valve locating tabs,
valve must be pointed downward for removal.
Do not force valve from oil filler tube.
3. After valve is removed, check condition of valve
O-ring (1).
5.7L V-8
The PCV valve (4) is mounted into the top of the
intake manifold (1). This is located to the right / rear of
the throttle body (2).

1. The PCV valve is sealed to the intake manifold
with 2 O-rings (2).
2. Remove PCV valve by rotating counter-clockwise
90 degrees until locating tabs (3) have been freed.
After tabs have cleared, pull valve straight up from
intake manifold.
3. After valve is removed, check condition of 2 valve
O-rings (2).
INSTALLATION
3.7L V6 / 4.7L V-8
The PCV valve is located on the oil filler tube. Two locating tabs are locatedonthesideofthevalve.These2tabs
fit into a cam lock in the oil filler tube.An O-ring seals the valve to the filler tube.
1. Return PCV valve back to oil filler tube by placing valve locating tabs into cam lock. Press PCV valve in and
rotate valve upward. A slight click will be felt when tabs have engaged cam lock. Valve should be pointed
towards rear of vehicle.
2. Connect PCV line/hose and rubber hose to PCV valve.
5.7L V-8
1. Clean out intake manifold opening.
2. Check condition of 2 O-rings on PCV valve.
3. Apply engine oil to 2 O-rings.
4. Place PCV valve into intake manifold and rotate 90 degrees clockwise forinstallation.

LINES - VACUUM
DESCRIPTION
A vacuum schematic for emission related items can be found on the vehicles VECI label. Refer to Vehicle Emission
Control Information (VECI) Label for label location.

CANISTER - VAPOR
DESCRIPTION

Two EVAP canisters are used. Depending on vehicle model and fuel tank size,the canisters may be mounted either
vertically or horizontally. These maintenance free, EVAP canisters (5) are located near the front of the fuel tank.