Volvo Parts Catalog Volvo Accessories Catalog Volvo Technical Articles Volvo Tech Forums
 
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Crankcase Breather Replacement
 
Bookmark and Share

Pelican Technical Article:

Crankcase Breather Replacement

Nick Czerula

Time:

4 hours4 hrs

Tab:

$300

Talent:

*****

Tools:

Sockets 10, 12, 13mm, wrenches, screwdrivers,

Applicable Models:

Volvo V70 (1998-01)
Volvo V70 2.4T (2001)
Volvo V70 AWD (1998-99)
Volvo V70 GLT (1998-00)
Volvo V70 GLT SE (2000)
Volvo V70 R (1998)
Volvo V70 R AWD (1999-00)
Volvo V70 T5 (1998-01)
Volvo V70 X/C (2001)
Volvo V70 X/C AWD (1998-00)
Volvo V70 X/C AWD SE (2000)

Parts Required:

Crankcase breather valve, crankcase breather hoses and clamps

Hot Tip:

Work with a cool engine

Performance Gain:

Car will run well

Complementary Modification:

Change engine oil and air filter

Some of the combustion byproducts in an operating engine are forced past the piston rings, thus creating pressure in the crankcase. The heating and churning of oil in the crankcase creates additional pressure. This pressure needs to be vented or it causes oil leakage past the engine seals and may even blow out a seal. Volvo uses a crankcase breather system in which the oil in the crankcase fumes is condensed and returned to the crankcase and the pressure and uncondensed vapors are fed into the engine intake to be combusted. The crankcase breather is also known as an oil separator or flame trap.

When a crankcase breather valve begins to fail, engine drivability suffers. You may have a rough idle, hard start or a check engine light that is ON with fuel trim faults if a hose fails. If your engine is consuming oil or smoking, checking the crankcase breather is a good place to start. It is mounted to the front of the crankcase under the intake manifold. The crankcase breather hose that runs from the valve cover to the crankcase breather is the hose I find broken the most. The rubber hose will tear or collapse from long term exposure to engine oil.

When replacing your crankcase breather, I suggest replacing all the hoses. They become brittle or collapse over time from exposure to engine oil and heat. When removing, the parts are likely to fall apart in your hands. In order to avoid vehicle down time, have the parts shown below before you begin.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The crankcase breather parts include: Pipe to valve cover (green arrow), Crankcase breather (red arrow), Drain hose (yellow arrow), Pipe to crankcase (blue arrow), vacuum hose to intake air pipe (red arrow).
Figure 1

The crankcase breather parts include: Pipe to valve cover (green arrow), Crankcase breather (red arrow), Drain hose (yellow arrow), Pipe to crankcase (blue arrow), vacuum hose to intake air pipe (red arrow). Disconnect the negative (-) battery cable. See our tech article on Battery Replacing for connection notes. Remove the intake manifold. See our tech article on intake manifold removing.

When removing the intake manifold, the breather hose (red arrow) was already removed.
Figure 2

When removing the intake manifold, the breather hose (red arrow) was already removed. Remember not to attach this hose until the final step of reassembly. Use a new hose clamp when securing it. The inset photo shows the clamp detached from the hose.

Next, working at the breather valve, use a pair of diagonal pliers and cut the hose clamps off the crankcase connection (red arrows).
Figure 3

Next, working at the breather valve, use a pair of diagonal pliers and cut the hose clamps off the crankcase connection (red arrows). If you are replacing all of the hoses, you do not have to cut the hose clamps on the top (green arrows), as you will be installing new hoses with clamps.

Working at the intake manifold support (green arrow), remove the 12mm fastener (red arrow).
Figure 4

Working at the intake manifold support (green arrow), remove the 12mm fastener (red arrow). Then remove the bracket from the engine.

Working at the breather, remove the two 10mm fasteners (red arrows).
Figure 5

Working at the breather, remove the two 10mm fasteners (red arrows). I use a 1/4-inch drive ratchet with a 10mm socket to access them. The right side fastener is hidden between a bracket and the breather.

Move to the bottom of the breather, at the drain hose.
Figure 6

Move to the bottom of the breather, at the drain hose. Use a T20 Torx to loosen the hose clamp closest to the valve (red arrow).

Remove the breather (red arrow) from the engine.
Figure 7

Remove the breather (red arrow) from the engine.

Next, remove the T20 Torx clamp and replace the drain hose.
Figure 8

Next, remove the T20 Torx clamp and replace the drain hose. Check that the drain is clear (green arrow) and not blocked with sludge. If blocked, remove the oil pan and be sure it is clear all the way through. Install the new breather and fasteners. Then tighten the drain hose clamp. Install the hoses at the top and side. Reinstall the intake manifold. During the intake installation you will install the vacuum hose and breather hose to the valve cover. When complete, doublecheck all hose routings.


Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Sat 12/3/2016 02:51:55 AM