Drok149

Just had my valve lash inspection done at 135k and a few valves were out of spec on the loose side at a snug .012 (spec is .009-.011). My mechanic (RCB) and lobuxracer both suggested to leave them.

mindcrime

iTrader: (2)

I will pass on this valve lash inspection for now.

ntaphse

So has ANYONE had this inspection done? I'm about to acquire my first ISF, an 08 with 62k and the previous owner opted not to do this as part of the 60k service. I'm trying to figure out what the common wisdom is among ISF owners.

Bigjon3475

iTrader: (2)

Well congrats on being here a year and finally getting that first post.

As far as conventional wisdom goes that's what the owner's manual is for. You're pretty much on your own if you decide to sway from it. Do you know if they replaced spark plugs and rear dif fluid?

FFM

The vehicle I bought has the paperwork from the 60k service done not too long ago and doesn't mention the valve lash inspection. The owner I bought it from is meticulous too, so not sure why Lexus of Bellevue wouldn't do it if it's a recommended service, and the owner is willing to pay for whatever is needed.

Justin727

probably a PITA the tech did not want to do. They're all about easy $ these days. If they can make $ doing an easy 60k gravy job over a valve lash inspection job they'll take the gravy every time.

lobuxracer

iTrader: (2)

I bought all these parts when I did mine the first time. Didn't use most of them. Were yours sufficiently hardened to warrant replacing them?

Joe Z

iTrader: (10)

The plan was to have this done while my F was at the dealership over 4 weeks in two consecutive visits for ELF Recall & a short list of extended warranty work, that needed to get done.

Unfortunately, the book rate quote I was given to perform just the inspection portion, was well ridiculous.

I ended up returning all the gaskets and buying: engine / cabin / oil filters, Toyota oil, brake fluid, EFI tank additive, wiper blades, belt & tensioner.

All I have left to do this month is the new Belt & Tensioner.

Joe Z

lobuxracer

iTrader: (2)

Rekindling an old flame.

I did this again this weekend and at 130k+ miles, found most of the rubber components pretty glassy, so they got replaced. I also discovered if you connect the two fuel lines on the driver's side backwards, the engine will not run for very long and will set a P0087 DTC for low fuel rail pressure. It took a little while to divine my error, but happily, nothing suffered permanent damage as a result.

Once again, I would not recommend this task for the mechanic with few hours of experience. It is a daunting task for many.

As an update, nearly all of the exhaust valves are at the limit for clearance, meaning they are at the loose end of spec. None of the valves measured tight. I was told a very long time ago, a loose valve is a happy valve, and I have learned from painful personal experience that tight valves are very expensive.

I did not attempt to adjust any of the valves since they all met Lexus specification, and I did not do anything prior to the inspection to ensure there was little/no carbon to be expected on the seats. Ideally, I would have done some WOT runs with water injection to clean up the carbon, but I have done enough of this stuff to know it is best to leave well enough alone when it comes to valve lash. Had they been tight, it would have been a totally different approach.

I also marveled at how they (Lexus and Yamaha) could have chosen shims underneath the rocker pivots instead of lash caps on the valve stems. I suspect that would have been quite a bit simpler and cheaper since they would not need 01 tool steel for rocker shims, but they surely do for lash caps.

At any rate, the good news is, even at 130K+ miles, the valves still meet factory specs for clearance. That is truly good news!

isfvss

Good news, Yamaha should know what they are doing with some very high revving engines. How long did it take you this time??

FFM

Used to shims with my E46, plus the inspection interval is much much more often. Was a pretty easy job though for the mechanically inclined. Probably need to look into doing this at some point this summer.

kolyan

Had this done at 30k and at 65k on my s2k. Paid $70 bucks each

Joker4096

iTrader: (2)

4 cylinders are a cake walk compared to this motor lol.

kolyan

Yeah I know

lobuxracer

iTrader: (2)

It went a lot quicker. Task familiarity helped a lot, but total time was jacked up. The idiot fuel line mistake sucked up a whole lot of time. I now know a whole lot more about the Lexus DI implementation in our engines than I ever thought I wanted to know. I could do it now in about 8 hours total. Adding to the complications was dropping the oil pan on the gearbox and replacing the filter at the same time, then after all work was done and the engine sealed back up, an oil change because it was due and because I wanted best opportunity to remove any dust/dirt that happened to collect with the valve covers removed.

I have a parts list I recommend for anyone over 100k miles doing this task. I'll add it to this thread.