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Clean Up Your Diesel’s Problems
By Rich Johnson

I spend most of my time on the water fishing and while a large segment of the boating community may not like or want to fish for recreation, they would rather spend time just cruising and entertaining. If any of you fall into this category and run a vessel over 25-foot, you more than likely are powered by diesel engines. Many of these entertaining vessels can be rather large and when it comes to fuel economy and large cruising vessels, diesel power is the only way to go, no doubt about it!

Any diesel-powered owner will tell you and rightfully so, that the dependability of his engine is very difficult to beat. Initially, they may be more expensive to purchase, but over the long haul they are more fuel efficient than gasoline, less prone to fire and require a lot less maintenance. Sounds like the perfect engine right?

However, if you ask a passenger on a diesel vessel, they’ll complain of foul and noxious fumes sucked into the cockpit, which can be a major contributor of seasickness if not just a nuisance. If you ask mechanics in charge of maintaining diesel engines, they may sound off on a messy or puddle engine room floor, the oily discharge from crankcase breathers, or stressed seals and gaskets that allow an oily film to coat everything in the engine room compartment. These folks may not be so inclined to rave on about the positive attributes of diesel engines. Even diesel owners themselves have to admit to some of this in their own hearts.

How would you like to get rid of all these diesel problems in one fell swoop? Sounds like a dream doesn’t it? The experts, and by that I mean charter and party boat captains, mechanics and marina operators or those that run diesels for business or pleasure, know these problems are a thing of the past and are optional if you choose to do so. Walker Engineering of California created the solution to such problems, with their Walker Airsep. While others have tried to duplicate the process and have come close, Walker is still the undisputed king with the know-how and technical support to make this dream a reality.

The oily film that coats an engine room is caused by the diesel’s powerful "positive" pressure, which spurts out a mist of oil and fuel emissions. Some of it may come from the crankshaft rotation, but the compression that slips by the piston rings and into the crankcase during the combustion of fuel and air in the cylinders, really intensifies blow-by problems.

What is blow-by? After each upstroke of a piston, the explosion of the combustion that forces the piston to the down stroke creates gases. Some gases pass the piston and end up in the crankcase below. The situation becomes worse as piston rings and their tolerances deteriorate through time. This positive pressure can create great stress and even failure of gaskets and engine seals that will seep oil, creating a real mess in the engine room. The Walker Airsep system separates and re-directs oil blow-by, back into the crankcase while at the same time, reduces positive pressure, which in the long run will add years of life to your diesels. This separator forms a "closed crankcase" breathing system by retrofitting and engine’s air intake and crankcase breather.

With no moving parts (like an auto’s air filter), the Airsep catches oil saturated air coming from the engine’s crankcase breather and then separates the oil and fuel emissions before returning them to the crankcase and air intake system respectively. This is accomplished through a centrifugal type air circulation system that swirls the blow-by gases. We know oil is heavier than fuel, so it is drawn to the outside and into a drain hose leading back to the crankcase. The remaining fuel rich gases (volatile) and water vapors are reintroduced into the intake system, which keeps components and passengers clean and eliminates noxious fumes! The bottom line is that blow-by in the engine is eliminated, creating "negative" pressure in your engine, greatly reducing the strain and stress on gaskets and engine seals.

The reducing of positive pressure into negative pressure and the reduction of strain on seals or gaskets results in smoother, overall engine performance and you may even squeeze an additional rpm or two out of this deal. This comes as an added bonus to substantial oil savings, sometimes as much as 30%, but the average is closer 20 to 25%. Better fuel economy and cleaner engine rooms are an added bonus and something every diesel owner wouldn’t mind having. If you need further proof, top diesel companies like Detroit Diesel, Cummins and Caterpillar install them as factory standards on many models.

Copyright May 6, 1995-2020 The Fishing Line

"The Fishing Line" and "The Fishing Line" & Design, are registered Trademarks of Richard Johnson.  They may not be reproduced, copied, represented or used in any manner, shape or form. The contents of this web site are copyrighted by Richard Johnson & RJ Productions and may not be reproduced, copied, reprinted or sold in any manner, shape or form, under penalty of law.