AfterMarketNews Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service Speedville

Coolant Transfusion: Proper Selection Prevents System Degradation

Coolant is easily analogized to blood, both being liquids that are essential to the functioning of an entire complex system. The analogy extends even ­further though because, like blood, coolant has different types, and it’s not a stretch these...

Read more...

Water Pump Cavitation: What Cavitation In Pumps Means

Why Cavitation in Pumps Occurs The tiny “bubbles” of water pump cavitation can kill the pump. While you will never actually see the tiny bubbles of cavitation in pumps, you can see the damage of cavitation that looks like metal eaten by termites. That...

Read more...

Think Before You Grab The Scanner

An older gentleman came to the shop with wipers that would not turn off. This customer was insistent that it had to be a serious malfunction. He was so sure of himself that it made me think there was something seriously wrong with the car. If it was going...

Read more...

How To Test Drive A Car To Check For Problems

Test Drive Diagnostics Test drives on the surface can seem like one of the most unprofitable tasks a technician can perform. But, test drives can be one of the most profitable processes a shop can do to help sell more service. You just have to have procedures...

Read more...

Electronic Proportioning Valve: Doing More With Less Hardware

Anti-lock brake systems (ABS) and the HCU are replacing proportioning, combination and other valves to change the braking forces in the front and rear. This is called Electronic Brake Distribution (EBD) and it can dynamically change the proportioning...

Read more...

GM Power Steering Noise/Leaks

GM: Power Steering Noise/Leaks from Power Steering Pump, Gear or High Pressure Hose During Extreme Low Temperature Conditions MODELS: -2009-2015 Buick LaCrosse (Equipped with Hydraulic Power Steering) -2010-2013 Buick Regal -2012-2015 Buick...

Read more...

The Ins And Outs Of Sanders

Sanders are required tools in today’s collision repair shop. Body techs and painters rely upon them every day to achieve that perfect finish on your customers’ vehicles. Whether you’re prepping a panel for paint or removing imperfections before...

Read more...

Are You Regularly Maintaining Your Equipment?

Technicians who are idling because the welder won’t feed wire, the hydraulic ram won’t pull chains, the booth heater won’t heat or the air compressor won’t compress enough air is a costly mistake, as labor time is the most expensive thing in any...

Read more...

Celebrate 'Back To The Future' Day By Watching The Time Machine Get A 2015 Detail

    For many today is just another Wednesday, but for a lot of people it is more than just your average Wednesday, it is "Back to the Future" Day. It is a day that everyone who watched the cult classic trilogy Back to the Future recognizes...

Read more...

Home News Volvo: Sometimes You Learn the Hard Way: Fixing Volvo Oil Leaks Right...

Print Print Email Email

The customer’s Volvo has an oil leak. You think you do everything right. You add dye and see the rear main oil seal leaking. The repair goes smoothly, the customer is happy…for about two weeks. Then the rear main oil seal is leaking again, and he wants to know why.

This is not an isolated case. Saab has released several TSBs on upgrading its crankcase ventilation system. It was inadequate and the excess pressure caused oil leaks. VW and Audi recommend replacing the suction pump on some of its cars before leaks are repaired. Again, excess crankcase pressure can cause leaks. Repair an oil leak without eliminating the pressure, and the leak will surely return. We learned the hard way.

In the hope of saving you from the same aggravation, I’ll discuss some of the symptoms of a clogged oil trap; how to test crankcase pressure; and, if it’s necessary, the steps involved in replacing the oil trap and related hoses. The older Volvo 240 and 740 models and the newer s70 and s80 models had similar setups to the 850 model that I’ll be discussing in this article.

Finding the Problem:

A customer’s 850 turbo comes in and it looks like oil is leaking from just about everywhere, or the dipstick is popped out. (See Photo 1.) Both are signs of a severely plugged oil trap. If you’re doing routine maintenance and, while cleaning the throttle housing, you notice oil in the housing, there is a good chance the oil trap is plugged. This is one of the reasons for all the electronic throttle housing failures on 1999 and later Volvos. We’ve also seen uneven idles and check engine lights with fuel trim codes stored, caused by plugged crankcase ventilation systems. Other cars with minor oil leaks may have partially clogged breather assemblies and are much more difficult to diagnose.

Volvo has a couple of TSBs on diagnosing and cleaning some of the crankcase ventilation systems on newer s60, s70 and s80 cars. Its special tool, P/N 9997226, is attached to the dipstick tube and at idle they want to see -0.2 KPA or less. We use an exhaust backpressure gauge with a hose attached to measure crankcase pressure (See Photo 2.) On a good car, even when raising the idle, the gauge won’t move above 0 psi. Plugged boxes are easy to see. We’ve seen more than 4 psi on some cars, and a psi of 0.5 on others. Remember that even if we see no pressure, the box can be partially plugged and should be replaced. If the car has 100,000 miles on the odometer, the oil trap should be serviced. Ignoring the problem can lead to a plugged passage leading into the oil pan, which requires oil pan removal.

Replacing the Oil Trap:

So, we’ve determined that before any oil seals are replaced, we need to check and replace the oil trap. Let’s get started.

Note: Always disconnect the negative battery terminal before starting any major repair.

The oil trap is located under the intake manifold, so the intake needs to be removed. Photo 1 also shows the intake oil leaks around the top of the engine.

Disconnect the throttle cable (See Photo 3) and the hoses from the vacuum tree (See Photo 4) and intake housing. There were five vacuum hoses on our turbo model.

  •  

    Remove the lower hose from the IAC valve, then remove the turbo intercooler to throttle housing tube. Be sure to check and clean all the vacuum ports on the tree and at the other ends of the hoses where they go into the turbo duct by the turbo (See Photo 5). The hoses will also become clogged over time.

    The spark plug cover must be removed to access the hose that comes from the oil trap (See Photo 6). Oil all over the cam cover is a good indication that the oil fill cap gasket is leaking. This is also an indicator that the oil trap is plugged. (See Photo 7).

    Pages: 1 2Next page

    Latest articles from our other sites:

    NASTF To Discuss The Road To Great Technicians

    “Building the Road to Great Technicians” will be the featured topic at the National Automotive Service Task Force (NASTF) Spring 2016 General Meeting. The NASTF Spring Meeting will take place from...More

    Beta Tools Offers #96BPA Hex Key Wrench

    Short-End 110° Hex Key Wrench Beta Tools of Italy offers its #96BPA Offset Hex Key Wrench, which has an extra-short end that is angled at 110° to provide access where traditional 90° angled wrenches...More

    NASTF To Discuss The Road To Great Technicians

    “Building the Road to Great Technicians” will be the featured topic at the National Automotive Service Task Force (NASTF) Spring 2016 General Meeting. The NASTF Spring Meeting will take place from...More

    Servicing Wheel Bearings & Wheel Speed Sensors

    If you are replacing a wheel bearing on a late-model vehicle, you’ll be dealing with a wheel speed sensor. In the past decade, wheel speed sensors have been moving from differentials, axles and knuckles...More

    Sonic Tools Offers Organizational Solutions to Meet Multiple Shop Needs

    The S10 Toolbox from Sonic Tools is a professional-grade toolbox featuring eight drawers (seven shallow, one deep), standing out from the crowd with an ABS workbench top deck, integrated can holders,...More

    Want to Become a TPMS Expert?

    Even if you consider the extra stress TPMS has introduced into our lives, we cannot overlook the benefits. We all know the benefits of proper inflation; we preach them all the time. The consequences of...More