Drop in replacements for hydraulic lash adjusters (13750-70020) that include a retaining groove for a clip to attach to the rocker. This adds a security mechanism if the rocker looses spring pressure due to a valve float/bounce/stick situation.
When the G16E-GTS first came out, we inspected the valvetrain and knew it would be a weak point. The rockers are floating and we had experienced failures with a similar rocker setup in the FA20 engines in the Toyota 86 (which we have subsequently made a fix for). With the buzz around the GR Yaris, we started development on our rocker retainer solution, specific to the G16E-GTS engine.
The best solutions are simple. It's a clip that attaches to the rocker and a groove in the hydraulic lash adjuster that 'catches' the rocker if the valve spring loses pressure for a split-second, due to a valve float situation.
If you haven't seen this solution before, it's actually quite common. More expensive performance engines such as the B58 BMW engine in the Supra and Lexus' flagship 2UR-GSE 5.0-litre V8 in the LC500 and RC F run rocker retainers. It's important to know that this is not a fix for valve float, instead, it adds a security mechanism to reduce the chance of a rocker dislodging if the valve spring loses pressure for a split-second, due to a valve float situation.
It's a no-brainer preventive measure when building a high performance engine. These should be stock on every engine Toyota makes.
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