Need step by step directions to change timing belt 1994 lexus es 300 v6 3000 4 cam 24 vaulve

Guessing you need the marks for the timing belt. Below are some pictures that should help. Just a hint, if you are replacing the timing belt, when puching the "plunger" down for the belt tensioner if you use a 10 mmilimeter hex wrentch it works PERFECT to keep the punger down. Hope this was what you needed and I hope it helps....

I would suspect the belt again. You may want to pull the cover and check the marks on the gears. One of the cams could have jumped a few teeth.

The bolts are "Lefty Loosey"

On 1994 Lexus ES300 3.0L MFI DOHC 6cyl the Thermostat is located under hood, passenger side, upper engine area, engine end of upper radiator hose, mounted in coolant outlet housing, you need to take off this componentes to access this.

Hope helps.

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the crank sprocket has an indention in it and it lines up with the small protuding dot on the block. the cam gears have recessed marks in them, and they line up with the v shaped cutouts of the back of the timing cover.

PLEASE TAKE IT TO UR LEXUS DEALER AND LET THEM FIX IT ONCE IF IT HAPPENS AGAI DUMB THE CAR

Sorry for the delay.
I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.

Click on the following direct Link. It has the Timing Belt/MARK(S) Diagrams that you will need, complete with Instructional and Directional Diagrams.

Again my apologies...
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1993/make/lexus/model/es_300/1993_lexus_es_300_timing_belt_diagram_marks.htm

The thermostat is located on the timing belt side belt side of the motor. Look below the alternator, there should be a metal pipe secured to the block with a 12mm bolt. The pipe is attached to the lower radiator hose.

Sorry for the delay.
I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.

Click on the following direct Link. It has the Timing Belt/MARK(S) Diagrams that you will need, complete with Instructional and Directional Diagrams.

Again my apologies...
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1993/make/lexus/model/es_300/1993_lexus_es_300_timing_belt_diagram_marks.htm