Is the ISF a solid or hydraulic tappet cheers.???The 2UR-GSE engine had four valves per cylinder – two intake and two exhaust – that were actuated by roller rocker arms with needle-roller bearings. Unlike the 1UR-FSE, the 2UR-GSE engine had fixed pivot rocker arms such that it did not require hydraulic lifters. To minimise friction, the sliding part of the rocker arm and camshaft lobes were lubricated.

Located at the fulcrum of the roller rocker arm, the 2UR-GSE engine had a hydraulic lash adjuster which consisted of a plunger, a plunger spring, a check ball and a check ball spring. The hydraulic lash adjuster was actuated by engine oil supplied from the cylinder head and an integrated spring. The oil pressure and the spring force that acted on the plunger pushed the roller rocker against the cam to adjust the clearance between the valve stem and rocker arm.

The 2UR-GSE engine featured titanium inlet valves, while the ‘umbrellas’ of the exhaust valves were made from nickel-rich heat-resistant steel alloy. For the 2UR-GSE engine in the Lexus IS F, valve dimensions and lift were as follows:

• Intake valve diameter: 38.0 mm;
• Intake valve lift: 12.0 mm;
• Exhaust valve diameter: 32.0 mm; and,
• Exhaust valve lift: 11.0 mm.
• http://australiancar.reviews/2UR-GSE-engine.php

 

^^^^Neither, See Post #5 here:

https://www.clublexus.com/forums/is-...e-ticking.html

Lou

 

edit: I have no clue. Since oil runs through the "valve rocker arm pivot" I was confused.

if there is a third picture below, ignore it. For some reason I couldn't delete it.

 

So its hydraulic fulcrum with shim adjusters on top of the valve, is this setup used in Yamaha motor bikes?? very interesting.

 

edit: this youtube video was irrelevant

 

THERE IS NOTHING HYDRAULIC IN THE VALVE TRAIN. PERIOD.

I sent those idiots an email telling them they have no clue about the 2UR-GSE more than a year ago and they STILL got it wrong. Morons without access to the technical data spouting off a bunch of pure BS about something they know nothing about. Actually sounds like a few members here.

 

So the rocker arm pivot is Solid in these motors, if so there are a lot of articles getting 1ur-fse confused with 2ur-gse by the sound of things. It seems weird that you can measure tappets with feeler gauges with a hydraulic setup ( you would never get a true reading). Lance have you seen the rocker pivots out of the heads to totally confirm this, thank you in advance.

 

I have not had the rockers out, but I have seen the pivots, rocker arms, and shims when I checked the valve lash adjustment on my engine. Zero hydraulics of any kind. Shims would be a total waste of time and money if we had hydraulics.

 

+1
If you ever pull the valve cover you can see it clear as day.
If only you could use the tool for the 2JZ to pop the shims out.

 

So the pivot post would not have a oil hole in the top, with the rocker off cheers.

 

No oil hole in the pivots at all. Solid steel.

 

Thanks Lance what are the tappet clearance cold in thou of inch cheers.

 

I'm still confused. Can someone explain this image? Is it a misprint?

 

The rocker needs some lubrication, even though the rockers have needle bearings. The oil flow indicated is from the motors pressurized oiling system and is supplied from the small orifice.
Nice system and evidently works well.

I had a similar design in another Yamaha motor in a Ford Taurus SHO. Very fast car when I changed the motor out to the 3.2 liter. Solid direct acting valve train that never needed adjusting. One of Fords shop managers said if it does not rattle or tick, leave it alone and I did. Shims lasted forever.

 

Thanks lorenr. Here's a pic from runyonwc's post in this thread https://www.clublexus.com/forums/is-...-warms-up.html



You can see something that looks like a hole or slit on top of the rocker pivots.

isfvss, in case you haven't seen this thread check it out. There's an awesome write-up with the clearance specs you're looking for on page 2: https://www.clublexus.com/forums/is-...ion-yet-2.html