PCV

(Positive Crankcase Ventilation)

The exhaust manifold has been removed, oil cooling line disconnected, and the oil trap box disconnected. Once torn apart, we can see how  bad it really is.

That hole? Think of it like an artery. That black 'stuff' is dirt and oil built up...think of that as the precursor to a heart attack! That blockage will prevent proper circulation...putting huge, unnecessary, and intolerable stress on the engine and its many seals. This kind of oversight will lead to bad rear engine seals

This car is having "the works" done to it. PCV jobs vary from model to model, as well as varying based on maintenance. Frequent oil changes (circulating clean oil through this system) helps avoid this condition. But, when it does get this bad, the oil pump in the oil pan actually gets build up. The only real remedy is to (drain the oil and) remove the oil pan, then have the oil pan chemically stripped by a machine shop. Here is the oil pan off of the car, you can see some burnt oil and various build up

A view from under the car, with the oil pan off

Close up of the pistons

The worst is over...reassembly, with new parts. The bright green is the new exhaust manifold gasket (even if the old one wasn't leaking, it only makes sense to install a new one while we are in there)

   

 

This is a first time for us and worst case scenario. The PCV effluent had baked up into the intake system choking the car and presenting runability problems.

Another fine example of where money will be well spent: This is the inlet on the block.

And here is the PCV Box, this mates up with the previous picture. Here you can see that it is fair to say that there is a 75% blockage.

Some more visible signs: The very top of this picture is the oil filler cap. You can see the oil burnt on and spilled down the side. This would be able to be seen as soon as you opened your hood. This would also cause a "burning oil" smell

With so much pressure, and no reasonable circulation, the oil is forced out of seals. This puddle was on the block, also visible when you opened the hood.

Where we start. A lot of disconnecting and removing components, then the cleaning and part replacement begins.

1997 Volvo 850 Wagon, non turbo