More timing help...

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Mike Kopstain

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Alright, here we go again. :)

Still can't get this car into time boys. Let me explain exactly what the car is and what it has and we can go from there. This is a 3.2 MTX conversion. 3.2 heads, 3.0 cams. Manual tensioner.

I have checked the locater pins on the cam sprockets. They are on correctly. I am sure this has to be something I am doing wrong, so I will tell you how and what I am doing when changing the timing belt.

I line up the dot on both intake cam sprockets to the 12 o' clock position, along with the notches on the inner timing belt cover. Second, I line the dot on the cam sprocket up with the mark on the oil pump housing at roughly the 5 o' clock position. Third, I put the belt on, text facing away from me, with both cam marks at the appropriate spaces on the cams. The 3.0 mark on the timing belt lining up with the dot on the crank sprocket. From there, tighten up the tensioner, and put everything back on.

Sometimes we would tighten the tensioner immediately, sometimes we would run the belt around a couple times without tension and then put tension on it. To be honest, I've never run the belt around a couple times. I've always just put tension on it and gone, but this was something that someone else suggested.

Now we can't get this car to start and I am growing more and more impatient, with myself. I feel like something this simple shouldn't be something holding me back. So here are a bunch of questions:

1. Does anyone have a documented write-up on how to change the timing belt? SHOtimes gives a writeup on taking it off, but not putting it back on. My helms book says something about a white dot on the crank damper (we don't have a white dot on this damper) and lining that dot up with the 0 degree mark on the lower timing belt cover. Some places I read to run the belt around with no tension, some places I read to tension it right away, but none of the places mention this mysterious white mark on the damper.

2. This is just for my curiousity. The tensioner (automatic/ manual) is the deciding factor on what mark you line up with on the belt, correct?

3. Exactly how much tension should be on the belt. I know that seems like a stupid, question, but again, we are looking at everything

4. We have fuel, we have spark. With no other changes, we had this car running, albeit out of time. So the timing is definetly the issue.

That's it guys. ANYTHING is helpful, even if you are telling me to take it to a real mechanic. :D

<small>[ February 28, 2003, 12:53 PM: Message edited by: Mikeys_Taurus ]</small>
 

Mr Anonymous

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The timing belt replacement you describe (sans rotating it before tensioning it) sounds fine. Even with a badly out-of-time motor, you should still be able to get it to start, albeit with sputtering, backfiring and stalling.

I'm wondering if in all the work in-and-out of there if you might have damaged the CPS or its wiring. Are you getting tach when cranking? I'm presuming you gapped it properly?
 

Mike Kopstain

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We didn't replace the CPS. I'm pretty sure it was recently replaced. We are getting a tach reading and we also have spark. (I took a plug out and grounded it with a screw driver while starting)
 

Yamaha V6

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"3.0L cams"... DID YOU TIME THE EXHAUST CAMS CORRECTLY? Did you remove the gears on the back end of the cams (chain tensioner area), or did you install the chain correctly if you didn't remove the gears?
 

rangerj

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Mikey,

See SDPATT's write-ups (2 or more) on timing belt installation, and on the "notches" on the crank pulley. The paint on the notches wears away in a very short time. The notches are, from right to left, white, yellow, white. Unless the pulley has been badly beat up the notches should be easy to spot.

This would be looking at the pulley from the front. the first notch is TDC when lined up with th "0" degree mark on the lower timing belt cover. Turning the crank to the yellow mark, 60 degrees, tensions the belt, that is sets the belt for the tensioner to be tightened down.

Turning the crank (by hand) for two full revolutions (360 degrees), back to TDC after the tensioner is set, is a check on the alignment of the belt and the crank and cams.

Again, check out SDPATTS disertation on the belt install/timing proceedure. I am away from my refference material and am relying on memory. Some days are better than others!

You can make sure you are TDC on the no. one cylinder with a compression gauge.
rangerj
 

DougLee25

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Rangerj, I think you have it backwards. This is the correct way to set up the timing belt. Cams at 12 o-clock like you had stated, and crank at the 5 o-clock position like you stated. With the crank dampner in your hand like a steering wheel, rotate it clockwise (like making a right turn). The first mark you see should be yellow, and this is the 60 degrees BTDC, then the white mark at 0 degrees, followed by another yellow mark at 60 degrees ATDC. Put the dampner on and you want the white mark at the 0 degrees on the timing cover. This is the 5 o-clock position you spoke of. Put the belt on like you describe with the 3.0 L mark on the timing belt at the 5 o-clock position. Release the tension from the tensioner by loosening the nut, and rotate the engine clockwise for 2 revolutions. Put the 60 degrees BTDC on the 0 mark on the timing cover. Torque down the nut to the required spec and you are set. Putting the engine at 60 degrees BTDC puts the most tension on the front of the belt so that the most slack on the rear can be taken up by the tensioner. Hope this helps out.

Doug
 

rangerj

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Doug,

I'm on the West end of the hotel so my bearings are disoriented! :confused: Thanks Doug, rangerj

It would seem Mikey is having a "SHO" day!!!!
I know he knows what he is doing, but this SHO has his confidence rattled. It happens to all of us Mikey. You're man enough to admit it. thumbs_u rangerj
 

Mike Kopstain

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Fred, I didn't do the cam job. That was done by the owner.

Greg, see, you are another person mentioning the damper pulley and the marks. Why do some people mention these and others don't even know of their existence? Are those marks just there incase you change the timing belt without removing the crank, because I've never utilized those marks or even heard of them until we got into the problem with this car.

Ranger, I know I'm going to give myself a firm smack in the head when I figure this out. I know it is going to be something stupid. :)
 

drivinhard

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Yeah rotating it around with the tensioner not locked down takes out the slack in the belt, then lock it down.

Wonder if the cam chain sprockets are on correctly? Could be 180 degrees off...
 

rangerj

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Mikey,

If you have any doubts about the cams and sprockets put a compression gauge on the no. 1 cylinder and crank the engine around by hand.

As the sprocket , and therefore the cam, comes into the TDC position the compression should top out. You can do this for each cylinder in the firing order and estimate the position the cam sprocket relative to 360 degrees.

The other alternative is to pull the valve covers and physically look at the cam positions at TDC for each piston in the firing order.

You could also get a look at the rear sprockets and chains to see if the cams are timed to each other properly.

I'm just throwing ideas out Mikey. Are the plug wires in the proper order on the power pack? Remember one of the aftermarket service manuals had it screwed up?

If someone else did the top end, did he plug the injector harness into the correct injectors?

I find that when I hit one of these mental brick walls, that the best thing to do is go back to basics. Put the no. one piston on TDC and them make sure that everthing else agrees with that.

These are just some thoughts Mikey. I know what you are going through. rangerj
 

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