4x4doog

So my water pump pulley bearing blew out the other day and the bearings blew out into the timing belt. Now I've pulled it all apart and am going to replace timing belt (I can't trust the timing belt isn't damaged plus its about time to do it).

I'm trying to line up the 0deg mark and the two cam marks are off, they only line up when the crank pulley is set to 15. I've tried turning the crank both directions and it doesn't change.

Now I don't know if the timing belt slipped when the bearing blew out or when the last time the timing belt was done (which was not by toyota).

What do you all advise?

Thanks for the help!

scope103

Timing chain? Timing belt? I'll have to guess which engine you have.

Let's try, oh, the 3VZE (with the belt). If you've pulled it all apart, there's no tension on the timing belt, and you can lay it on the cam sprockets anyway you want. Is that what you mean? Or have you not taken anything apart, and you're just looking at the existing setup?

Do be sure you're looking at the correct timing mark for the harmonic balancer (crank). There is a mark for both 15 and 0. I'd be surprised if it would run with the cam timing off by 15 degrees at the crank.

4x4doog

Yes its a belt and its the 3VZE. I've attached some pictures.

I haven't taken the belt off yet, because I'm not sure if I should just pull it apart to rebuild it at 15 deg or do something different. What would you recommend?

Thanks for the help.

brianh699

have you turned the engine over 360 degrees to see if they line up then? The painted marks on the belt are for installation only they won't line up with the marks on the cams on every revolution. As long as the marks on the cams line up with the marks on the timing cover your good. There is a mark on the crank gear that lines up with a mark on the oil pump. This is the factory procedure if you don't already have it.
http://personal.utulsa.edu/~nathan-b...67timingbe.pdf

scope103

Well, that's a first for me. I can think of three possibilities:
1) The timing belt really was installed off 15 degrees, and somehow it still ran.
2) The Harmonic balancer failed, and twisted 15 degrees (the balancer is two pieces of metal with rubber in between; others have reported that failing, but not to some exact number like you seem to have).
3) The cam sprockets are held to the cams with a 5mm pin called a "knock pin." On mine, the pins both had a "jog" in them, possibly due to someone in the past trying to remove a stuck cam bolt by holding the cam sprocket rather than holding the cam itself. If yours have a 1mm jog, that would produce about the offset you're seeing. (The pins are a dealer item and not expensive. If yours have moved, they will have dented the slot in the cam sprockets, but they can be reversed and flipped and you should be okay.)

Take careful pictures, as you already are.

4x4doog

brianh699, Thanks for the manual. I've got the 92 manual and the instructions are a bit different. I've turned the crank over 720 degrees to try get the crank to 0deg and the cams to line up (step 16 from the pdf), it didn't help.

Am I missing something?

brianh699

If you suspect the crank pulley has twisted, check the timing marks on the crank gear to oil pump if they are lined up when your showing 15 degrees, the pulley twisted. Check the cams like scope103 suggested, if neither of those are bad, I'd say the belt was incorrectly installed. If that's the case just line up your all your timing marks, reinstall the belt. Then turn the motor over manually to make sure everything moves as it should.

4x4doog

Thanks for the replies. I've looked at the cam sprockets, see the pictures, but don't see anything out of place or damaged. I'm not sure how to check the oil pump marks, I assume I need to take the belt off.

I appreciate the help

brianh699

Pull the crank pulley to check crank gear. The fsm calls for a puller, but you can usually pull it with a couple of screwdrivers on either side of the pulley.

scope103

You can't see the knock pin without pulling off the cam sprockets. Unfortunately, that's often a difficult job, and you don't usually do it to replace the timing belt. Also, I don't think you can tell where the cam sprocket is "supposed" to be by feel (by trying to feel where both the intake and exhaust valves have closed on cylinder #1), but someone else may know how to "degree" a cam.

To remove the cam sprocket (if you decide to go that route) you need to keep the cam from turning while you put 108 ft-lbs+ on the cam bolt. Search on this forum for some shop-made tools. IF you were removing the valve covers anyway, it is easier (IMHO) to hold the cams by the 27mm flats in the middle of the cam. (27mm? Well, you can use a 1 1/16" wrench, which IS easier to find.)

Good luck!

scope103

From your photo, I see that the cam sprocket has 48 teeth. One-tooth-off translates to exactly 15 degrees at the crank (the cam rotates 1/2 the speed of the crank). Since you've set up and measured everything so carefully, I'm now leaning toward nothing more complicated than a mis-installed timing belt.

You'll still want to check if the harmonic balancer twisted. You have to remove it to replace the timing belt, so keep it at the TDC mark when you remove it. The crank sprocket has its own TDC mark.

4x4doog

Thanks for the help, just spend a ton of time trying to get the crank pulley bolt off. It looks like the match marks do NOT match up they are off by 1.5 teeth on the oil pump.

When I replace the timing belt should I make sure all the match marks line up? or should I put it back this way?

Pics to come

4x4doog

The Cams are all lined up, here is a pic of the oil pump.

What do you guys advise? put it back together as is or line it all up as the manual recommends?

I really appreciate the help!