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Toyota And Subaru Valve Spring Recall

Australian Subaru and Toyota dealerships have sent out a recall on valve springs in Toyota 86 and Subaru Impreza, XV, Forester and BRZ. This effects 5,407 Toyota 86 vehicles produced from April 2012 to July 2013.

The Subaru recalls affect over 24,000 cars including Impreza models from year 2012-2013, as well as XV and Forester vehicles fitted with a 2.0-litre engine (manufactured January 16, 2012, to May 14, 2013). The issue also affects BRZ vehicles – manufactured from start of production to May 14, 2013.

High stress and sub standard material quality appears to be the likely cause, and may lead to fracture or breakage of the spring and cause power lose to your car and cause further damage. Southside Cylinder Heads advise taking your vehicle back to the dealership for a warranty repair to rectify problem.

For more information for Toyota owners click here

For more information for Subaru owners click here

Toyota 1KD-FTV Piston Failure

Toyota Hilux 1KD-FTV EURO 4 Spec

 

Models – KUN26, KDJ120, KDJ125, KDJ150, KDJ155

Fault – Crack in piston, can lead to localised rupture

Symptoms – Sudden loss of power, engine runs rough (on 3 cylinders), loud knock at idle, black smoke from exhaust, excessive crankcase pressures

When disassembling the engine, there are cracks detected in one or more pistons (various sizes, up to a local ruptures). The look is radically different from the cases of usual piston melting, and only small local flowing can be observed in the areas of ruptures.

Summary Piston Cut out 1kd

The 1KD engine has been sold in Australia for over 10 years, and has had a bumpy ride in terms of engine reliability.  The first production of the engine is not affected by this issue as it featured a piston design which included a metal fibrous structure fused into the piston crown (as pictured).  This structure added extra strength to the piston thus avoiding failure.

The engine underwent Euro 4 emissions modification which coincided with an overall modernization – reduced compression ratio, increased torque and power. The shape of the combustion chamber in the piston was changed, and any mention about the reinforced zone disappeared.  Considering the circumstances of occurrence, the cause of the problem should be called “inadequate strength margin on pistons”, essentially it comes down to design and construction mistakes on the Euro 4 version of the engine.

1KD-FTV Pistonkd-crack

Three years later the obviously substandard pistons were replaced by a new revision, however whilst this was an improvement, failures were still occurring, but at a lesser rate than previous.  Contributing factors are also associated with the fuel system, but are secondary.

The failures are most commonly occurring around the 100,000 – 150,000 km.  The problem is recognised by Toyota in several service bulletins released between 2011 and 2014.

See – technical-service-bulletin-toyota-1kd

Euro 5 revisions brought yet another design change, and whilst it’s still early days, it looks like the problem may have been resolved.  Time will tell.

Owners and potential buyers of the “EURO 4” affected models of the Hilux, Prado and Hi-ace should be wary.  The advice is simple, avoid chip tuning, avoid long driving at high speeds (especially under load) and service the fuel injectors every 100k.  This will reduce the likelihood of failure, but the only to overcome the inherent design fault is to change the pistons.  Speak to Southside Cylinder Heads today about repair and failure prevention options.  Engines & cylinder heads since 1977.