02/11/2024
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Case Study #2 - BMW E82 123d
This one is about being a little bit proactive with maintenance of your diesel engines.
Diesel engines are great, you get the power, torque and fuel efficiency in one package but there are downfalls. Namely emission control devices.
This diesel is equipped in a few of those.
Positive Crankcase Ventilation - The PCV systems main job is to regulate internal pressure inside the engine. Over time the valve gets blocked or damaged and isn't sealing properly and lets excessive air and oil into your intake. This can cause excessive oil consumption, excessive soot deposits inside the intake and particulate filter as well as oil leaks. We recommend replacing the PCV system at around 100K intervals. In the case of this BMW this meant replacing the full valve cover as the PCV was integrated into that cover.
Injector Sealing Washers - Underneath your diesel injectors there are copper sealing washers that prevent combustion gasses leaving the combustion chamber as well as the loss of compression. Those washers over time burn away and don't seal properly anymore. Sometimes the seals failing is obvious and you can clearly hear "chuffing" from the engine bay, carbon deposits around the injector and exhaust smell in the cabin. However, most of the time the seals fail way before this happens and they start to let the exhaust gasses into oil and create carbon deposits in the oil degrading its lubricating and cooling properties. This mixed with extended service intervals could lead to major failures of turbochargers or even engine themselves overtime. We recommend replacing those washers and injector mounting bolts at 80K intervals. Parts are cheap enough and if done proactively should be an easy enough job to do. Becomes much harder when they fail and injectors get seized in the cylinder head.
Exhaust Gas Recirculation - Does what it says on the tin. Let's exhaust gasses back into the engine. This has a few jobs, but all of them lead to one thing, emission control. IT does create a few problems to us. Carbon and soot deposits in the intake = less space for air to pass through = less air = richer fuel mixture = more soot. It's a vicious cycle.
In the pictures below you can see the intake manifold, this needs cleaning periodically, which we recommend at 3 to 5 year intervals. We had customers tell us that they noticed a massive improvement in responsiveness and even fuel economy of their engines after intake system cleaning.
Diesel Particulate Filters (DPFs) - A filter in the exhaust system which stops harmful soot and particulates from going into the atmosphere. When they work they work great and you don't really notice that they're there but they are the first thing that gets the brunt when there's anything slightly off with the running of your diesel engine. Manufactures predict that those filters are good for about 160K miles but we've seen them go a lot longer if they're being looked after. Doing all the above will help your DPF live a lot longer without the need for replacement or removal.
We always say that we only want to see your vehicles once or twice a year. Namely for the annual service and the MOT. Looking after those systems will give you better chances of that happening.
To book your car message us on WhatsApp on 07729 020196