I didn't consider the Google Search rankings...
Basically the " | " is TDC and the "T" is a service position. But for some reason the FSM doesn't list it and my write-up was based on the FSM using TDC so that people can reference the FSM .pdf and the thread. Which in retrospect may not have been the best idea since there is the possibility of having a cam slip and maybe ding a valve.
I'll have to consider my options because I'd hate to throw away all the good information from others, but I don't want to confuse people anymore than it's been pointed out in so many pages. lol
I did everything as per the FSM and it said to move the crank (with timing belt still attached) from the line up dimple for the oil pump 50 degree counter clockwise before removing the timing belt. This leaves the notch on the crank straight up and the notches on the cams about an inch to the left of the timing line on the cylinder heads. So, this is supposed to release all tension on the cams, but it actually loaded them and of course it eventually sprung ahead to the timing mark....then the next day I noticed the drivers side cam sprocket rolled to the left about 60-70 degrees. I heard a ping when the other side sprung ahead and that scared me....the otherside sprung back further, but I didn't hear that one.... This operation was supposed to prevent this from happening, but the FSM is clearly incorrect. Any ideas why it said to do this and does anyone think I bent a valve?
Thank you for posts and this website. I have found this website very useful for numerous DIY tasks for a couple years- every since I bought my first 4Runner. I have yet to post because I have always found great, helpful information.
I have the same unanswered "questions" as expressed above in post #90 of 210 posts on the timing belt change. I feel the discussion is incomplete for someone considering the timing belt change. I'm very grateful for Blackworkinc for posting as this discussion has provided me with hours of reading and days of thought in preparation leading up to my timing belt change.
I would like to request a reply from Toyota technicians that have weekly experience changing timing belts on a 2005-2009 4Runner 2UZ-FE (V8) or other vehicles under my comment #3 below to my following two questions.
Q1) Has the standard work for timing belt change (EM16 - EM24 Toyota Factory Service Manual for timing belt removal) been revised? If so, please clarify the revision(s).
Q2) If EM16 - EM24 is correct, and I do not plan to remove the camshaft timing pulley and cam shaft, is it standard practice to ignore the rotation of the crankshaft 50 degrees just prior to timing belt removal?
Below are a few comments in regards to why I ask. Some information that I will provide are indifferent and contradictory to some comments and suggestions in the discussion thread.
My Comments:
1.) The Aisin timing belt kit (TKT-021) instructions match EM16 - EM24 with exceptions to part names, terminology, and work sequence. For example, the removal sequence of the alternator (generator assembly) is step #9 in EM16 versus approximately step 19 in Aisin TKT-021 work sequence. TKT-021 contains an exploded view of parts and bubble number references. TKT-021 is not just a copy of the FSM. I believe this is a popular kit due to forum recommendations, OEM supplier made parts, and great value in comparison to dealer purchased parts. So, if the FSM is wrong, then so is the Aisin kit work instruction for my application.
2.) The Aisin TKT-021 kit came with six unique work instructions that clearly specify the Model, Year, and Engine Identification. The same kit can be used for a variety of vehicles, specifically GS400, GS430, Land Cruiser, LS400, LS430, LX470, SC400, 4Runner, GX470, SC430, Sequoia, Tundra. The kit parts are the same, yet the timing belt removal and/or installation instructions are somehow different among the six pages depending on the vehicle model, year, and engine.
3.) Therefore, as the owner of a 2007 4Runner, I only need page #2 (4Runner 4.7L V8 2005-2009). I will not use page #5 (4Runner 4.7L V8 2003-2004) or any other page provided. Based upon TKT-021 page #2, the only video or write-up that I can follow to the "T" must be performed on the following common vehicles:
4Runner 4.7L V8 2005-09
GS 430 4.3L V8 2007
GX 470 4.7L V8 2005-09
Land Cruiser 4.7L V8 2007
LX 470 4.7L V8 2007
SC 430 4.3L V8 2005-2009
Sequoia 4.7L V8 2009
Tundra 4.7L V8 2009
Nevertheless, I will use videos and write-ups on all Toyota V8 engines because I know there will be some commonality, useful tools, and techniques discussed. This information is greatly appreciated.
4.) TKT-021 and EM19 clearly and boldly specify the same critical factor in regards to removal of the timing belt.
TKT-021 states:
Step #9: Using the crankshaft pulley bolt, turn the crankshaft clockwise until notch on sprocket guide is aligned on the oil pump body.
Step #10: Ensure cam shaft sprockets timing marks are aligned
Step #11: Using the crankshaft pulley bolt, turn the crankshaft counterclockwise by 50 degrees until notch on sprocket guide is at approximately the 12 o'clock position. NOTE: The camshaft sprocket timing marks will move approximately 25 degrees counterclockwise and will no longer be aligned.
EM-19 section #21 states the same instructions and adds the bold print critical factor:
NOTICE: If the timing belt is disengaged, having the crankshaft pulley at the wrong angle can cause the piston head and the valve head to come into contact with each other when removing the camshaft timing pulley and camshaft, causing damage. So, always set the crankshaft pulley at the correct angle.
EM-19 shows the same 50 degree counterclockwise positioning work instruction and diagram of the crankshaft placement prior to removing the timing belt.
5.) FYI- TKT-021 page #5 for 2003-04 4Runner 4.7L V8 does not include rotating the crankshaft pulley 50 degrees after timing marks are aligned. Pages #1 and #6 detail rotating the crankshaft clockwise 50 degrees prior timing belt removal.
6.) FYI- On the 2007 4Runner, when the notch on the sprocket guide aligns with the mark on the oil pump body, the camshaft sprocket timing marks align on both cams as required in the instruction. When the crankshaft is rotated 50 degrees counterclockwise, the cams get "loaded". Once the timing belt tensioner is removed, the timing belt falls off easily. However, the right cam "unloads" and rotates clockwise back near the timing mark. The left cam "unloads" and rotates counterclockwise beyond the mark.
7.) Both EM18 and TKT-021 specify the need to first return the cams to the installion positions (Right-side cam 1 tooth clockwise of alignment mark and left-side cam 1/2 tooth clockwise of the alignment mark). Then, both instructions specify to rotate the crankshaft sprocket guide back to alignment with the mark on the oil pump body. The "T" marks are never mentioned or shown on the instruction although they exist next to the camshaft sprocket timing marks.
8.) For installation of the new belt, both EM20 and TKT-021 detail the same instructions. EM-18 specified to mark the old belt prior to removal if marks are missing and you plan to reuse the belt. TKT-021 doesn't specify the need for transferring (verification) of the old marks to the new belt. However, this is necessary for confidence in installation of the new belt to marks at TDC (the same position that it came off as reiterated in many other posts). The new belt is installled 1 tooth off and 1/2 tooth off right and left side respectively of TDC marks for easy installation. However, once the timing belt tensioner is engaged, the cam marks self align to TDC (correctly under standard timing belt tension).
