Toyota Forum banner

2005 Highlander V6 3.3L Timing belt service (theoretical / conceptual) question

2 reading
14K views 15 replies 9 participants last post by  carguy75  
#1 ·
Greetings! Thanks in advance for your help. I am getting ready to change the timing belt on this car. I have no idea on the service history. It has 90k miles so I assume the timing belt has never been done. I have done the timing belt on my 02 civic LX so I do have some experience.

Here is the video

I have watch a ton of youtube videos for this specific car. One video has me stumped conceptually (at minute 15:46)
On the front cam he leaves the mark one tooth to the left to allow for when he tightens the belt. This seems odd. The guy seems to really know what he is doing so I assuming its my ignorance (but please educate me).
Ok here is what I don't understand:
1) As I understand it, the whole idea of the marks on the cogs/pully/gears (whatever you want to call them). is that when they are all in alignment with the marks on the engine (or in this case the rear cover) then all of the moving parts inside the engine are going to be in a consistent spot.
2) Thus you align them take the cogs/pully/gear off, do the service then when you put the cog back on you put it in the same place so you know exactly where the moving parts are inside. In the video he is not doing that. he has the cog one tooth to the left. so when he tightens up the bolt THEN moves the cog to the right, the valves will be off. stated another way, when he tightens THEN moves the cog to the right the tick marks will visually be in alignment but the valves will be off.

Could someone explain?
Thanks!
 
#5 ·
I have about 120K and think I might need to tackle this in the near future. At what milage are guys replacing timing belt, water pump etc and what kit are you using? I did the timing belt and water pump on my 2UZFE tundra and the 3MZ-FE looks to be harder to do.
About 90k is good time, but the OEM timing belts can go over 100k miles without failure. However, I would not risk going over 100k since it is an interference engine in the Highlander V6 models.

I used a AISIN timing belt kit in my 2007 Highlander 3.3 V6 which included OEM parts.
 
  • Helpful
Reactions: sdspeed
#4 ·
The guy in the video turn the cams back to make installing the timing belt easier. That is generally a big no no, but it works for him. I did not turn my cams back(counter-clockwise) to install my timing belt on my 3.3 V6 Highlander. I installed my belt and cam sprockets with all the marks aligned. It was pain in the butt to get the timing belt on properly, but the belt will go on without turning back the engine.
 
#7 · (Edited)
Note: I used clips to hold the timing belt in place while I installed it so that it remain in place until I could install the tensioner. It took me a while to learn this trick. The belt will keep slipping off if you do not clip it in place. It took so many tries that I rubbed off most of the dotted alignment paint off the belt.
Image

Image
 
#14 ·
Thank you.

I used spring-loaded plastic clips to prevent damaging the belt or the camshaft sprockets. The belt only need to be held in place until it is installed. I would not use any metal clamps or vise grips to hold the timing belt.