Would you say my T-belt is off by a tooth or so???

[makriluc]

Hi Guys.
With these two pics, would you say my T-Belt is off by a tooth or maybe more.
The engine starts and run but lacks power. Before I start stripping the covers, I'd like to have your comments

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[mavisky]

Top looks timed right. Not familiar enough with the lower to make a claim based on it, but I doubt it is if the top is in order.

 

[anisbeth]

The camshaft gears are lined up correctly. However, if the yellow mark on the crank pulley is where the timing marks are supposed to line up, you're off by more than one tooth - would have bend valves. If you car is idling good, you're okay. Your lost of power may be somewhere else.

Spark plugs, plug wires, boost leak, etc.

 

[booostedGSX]

Looks to be in time. So, check everything else for your problem.

 

[Auto RS T]

Run a straight edge along all 4 timing marks on the cams, they should all line up.
[Not on a 2G.]

When those marks line up, the mark on the crank pulley should be at the "0" on the timing tab.

 

[makriluc]

Yes the yellow mark is the timing mark on the crank pulley. And I agree with you Auto RS that to me that timing mark should be at zero or pretty darn close to it and not at 20 BTDC.

 

[Auto RS T]

You may want to pull the front cover and verify the other lower timing marks. If they are off you would want to redo the timing belt correctly and then run a leakdown test to determine if some valves are bent or not sealing all the way.

If the test turns out good, you can re-assemble everything and you should be ok.

 

[anisbeth]

Yes the yellow mark is the timing mark on the crank pulley. "...timing mark should be at zero or pretty darn close to it and not at 20 BTDC."

If this is the case, then you'll have to re-time everything to be sure - just like a timing belt install. Doing this is only disguising the real cause. How many miles are on the timing belt? Replace if it's near 60k. Also, the autotensioner is probably starting to go - not keeping belt tight and making it jump.

 

[makriluc]

T-belt was replaced in October. I replaced all belts due to a leaking water pump. So the pump, tensioner and belts are new. Is the crank pulley made of two parts with a rubber part in between? Maybe the outher part sliped. The engine idles great, I don't suspect bent valves. I'll remove the front covers and see by myself. I'll keep you guys posted.

 

[Auto RS T]

The crank pulley is a two piece design and they are known to come apart. You will want to take a closer look at that also.

There is a dowel on the crank that lines up with a hole in crank pulley. The dowel could be missing causing the timing mark to be off. Is the pulley installed correctly?

 

[spaugh]

My t-belt jumped three teeth would start and idle. Idle was a little rough but i had no power and was real slow revving. In my case it did not hurt any valves.

 

[97GSTAUTO]

T-belt was replaced in October. I replaced all belts due to a leaking water pump. So the pump, tensioner and belts are new. Is the crank pulley made of two parts with a rubber part in between? Maybe the outher part sliped. The engine idles great, I don't suspect bent valves. I'll remove the front covers and see by myself. I'll keep you guys posted.

You are timed correctly. I wouldnt worry about the mark on the crank pully because its not used to time the car when changing the timing belt. the crankshaft sprocket is. I would do a boost leak test to check for leaks.

 

[makriluc]

Ok guys, after removing the T-belt covers this is what I saw.
The cams were in synch with each other has the picture shows.
But the crank was off by 3 teeth BTDC and the oil pump sprocket by 1 tooth.
There was no slack in the T-belt. So my conclusion is, when I replaced the water pump last October, I did not pay attention enough in making sure all the T-marks were aligned.
Man, the car pulls like a new puppy. The wife is very happy.

 

[Auto RS T]

Good to see that you have it all figured out. The crank being off was definately a hint of something out of line.

 

[nefarious]

Remember though, it takes at least 6 full revolutions of the crank for all of the timing marks to line back up. It could be that you weren't all the way through the 6 full revolutions.

 

[blcknspo0ln]

Remember though, it takes at least 6 full revolutions of the crank for all of the timing marks to line back up. It could be that you weren't all the way through the 6 full revolutions.

I was just about to say that. Are you sure that was at real TDC? You can always check and line everything up and put a screwdriver in piston 1 and see if it starts going down as soon as you pass TDC.

 

[mavisky]

Remember though, it takes at least 6 full revolutions of the crank for all of the timing marks to line back up. It could be that you weren't all the way through the 6 full revolutions.

But remember that only matters if you have the balance shafts in. Even if you do have them in though the camshafts and the crankshafts will lineup every revolution, only the bs timing marks take 6 turns to line up.

 

[makriluc]

You are right. When I replaced the water pump back in October, I didn't noticed it took so many crank revolutions to line all the spockets. This time I did notice. But I didn't expect the motor would have run "that well" with 3 teeth off on the crank.

 

[talontd92tsi]

But remember that only matters if you have the balance shafts in. Even if you do have them in though the camshafts and the crankshafts will lineup every revolution, only the bs timing marks take 6 turns to line up.

The oil pump timing mark (wether relevant or not in a bs eliminated engine) will align every 3 revolutions btw... not that it makes a difference, i just noticed that saturday when doing my t belt install on the engine stand.

 

[lgoss5127]

your timing looks good. my timing belt jumped 5 teeth once and bent every single valve. that was a fun fix