How it should be from the factory. Improve the reliability of your Toyota G16E-GTS engine and rev with confidence! 

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 loses 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 fixed). 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.

WHAT'S INCLUDED

• 12x Denstoj Hydraulic Lash Adjusters (Billet alloy steel and heat-treated)
• 12x Denstoj Rocker Retainers Clips (High carbon steel and heat-treated)

VEHICLE APPLICABILITY

Vehicle: Toyota
Model: Yaris GR (XP210), Corolla GR (GZEA14)
Engine: G16E-GTS
Year: 2020-Present

PART NUMBERS

Drop-in replacements for OEM hydraulic lash adjusters (Part Number: 13750-70020).
There is no change required to the OEM rocker arm (Part Number: 13801-25010).

FITTING INSTRUCTIONS

It is easiest to remove the camshafts to install. Be careful not to misplace any of the valve caps ontop of the valve stem when installing and that the tappet cover seals and gaskets are re-installed, otherwise the rockers may suffer from oil loss.

For hydraulic lash adjusters, no shimming is necessary as they adjust under oil pressure to maintain proper clearance.

Hydraulic lash adjusters (HLAs) must be checked for plunger movement before installation. If the plunger does not compress when squeezed firmly between your fingers, the lifter is likely pumped up with oil.

1. Place the lifter in a soft-jawed vice or hold it securely in a rag.
2. Use a small pick or paperclip to gently depress the internal check ball through the oil feed hole.
3. While holding the check ball open, slowly compress the plunger using your fingers.
4. You may see oil come out — this is normal.
5. Repeat until the plunger can be easily compressed and springs back under light pressure.

Important: Do not reinstall HLAs while they are still pumped up. A fully compressed plunger ensures proper valve seating during initial start-up.

Please note, install at your own risk. Clips must be installed correctly so as to not place any load on the clip except under preventative circumstances where the rockers are unloaded.

Although they are OEM drop-in, whenever valavetrain work is being done, refer to the factory removal and installation procedures and precautions.