Timing Belt Rubbing :( , Watch Video to see what I mean

[dsmcoder]

I recently did a timing belt job and now I am starting to hear a rubbing sound coming from the timing belt area. Its not a constant rub, it rubs then stops really fast over and over again. Tomorrow I will post a video so you guys can see what I'm talking about. It also almost looks like the belt could be wearing on each side, but it's so fine I can't tell.

Any ideals?

 

[rlacasse1]

Only thing I can think of is tear it apart and look. Timing belt isn't something you want to take chances on. That's my only idea.

 

[Calan]

Could just be the timing cover. They are notorious for getting hot and warping. Even a new one can rub if it's tightened a little too much in certain places, causing it to flex. I've pulled covers off that were practically worn all the way through.

May also be an accessory belt making some noise. Try removing all the accessory belts and running it long enough to see if the sound disappears, and then remove the timing cover if you still hear it and try again. If it's still noisy with the cover off, at least you'll be able to inspect everything at this point and nail it down.

 

[luv2rallye]

If there's a groove in it you have one of the oil pan bolts near the belt too long (they are different lengths). Otherwise I agree the cover is the most likely.

 

[dsmcoder]

I will check the cover, I'm not sure if I put the right bolts into the right holes, my engine was replaced and I could not figure out what timing cover I had.

 

[Killa_dsm]

I will check the cover, I'm not sure if I put the right bolts into the right holes, my engine was replaced and I could not figure out what timing cover I had.

This might help for next time or if you plan on taking the cover back off.

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90-91

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92-94


Thread diameter
× thread length
mm (in.)
A: 6 x 16 (.24 x .63)
B: 6 x 18 (.24 x .70)
C: 6 x 25 (.24 x .98)
D: 6 x 28 (.24 x 1.10

 

[dsmcoder]

Would having the wrong bolts in the wrong holes cause the timing cover to rub against the belt even if all the bolts are tight?

 

[Calan]

Would having the wrong bolts in the wrong holes cause the timing cover to rub against the belt even if all the bolts are tight?

Yep. There are metal inserts in the cover, but it's still extremely easy to warp it if the wrong bolts are used; especially once a little heat is applied. There is very little clearance between the cover and belt to begin with.

 

[dsmcoder]

Should I loosen the timing cover bolts some and start it to see if it goes away?

 

[Calan]

Couldn't hurt. Just be careful and don't back them out too far, and don't leave them like that. If it fixes your problem, pull them all and put the right ones in. But... it may still rub if it has warped. It's actually pretty common (and may even "fix" itself once it wears a bit , although it's not really good for the t-belt).

The best thing to do is what I mentioned up there ^ in post #3. If you get to the point of the cover being off, check the inside of it for grooving.

EDIT: Just thought of something else you should check. There are two very thin sheetmetal backing plates that bolt to the head and support the cover at the top. These things can get bent backwards very easily, especially if you put any force on the cover when tightening the upper bolts. Make sure those aren't caved in away from the timing side of the motor. If they are, just pull them back out towards the driver's side to straighten them.

 

[dsmcoder]

Here is a video of the sound, skip to 3:30 to hear it clearly.

YouTube - 1g dsm 4g63 timing belt rubbing

 

[Below Ambient]

i had the same problem... found out it was the crank trigger plate rubbing... found a rough edge on it and filed it down smooth... no sound now

 

[dsmcoder]

Where is the crank trigger plate?

After my car warmed up a different noise started coming from the timing area. Here is the video of the other noise. YouTube - Another timing belt noise

 

[Below Ambient]

yeah that's the same sound i had.... the trigger plate is accessible by pulling the timing cover off, its behind the crankshaft pulley for the timing belt.. if you're good enough you can get a file and feel for the rough edge and file it down by turning engine over by hand and finding enough clearance to use the file on it... I can't really explain the procedure by describing it in words, but you'll see what i mean once you get the pulley and cover off

 

[dsmcoder]

I will have to look into that then, anyone else have the same problem?

 

[rlacasse1]

Correct me if I am wrong as I have only worked on a 90 4g63, but a 91 shouldn't have a crank trigger plate. Isn't that a 2g thing?

 

[dsmcoder]

Correct me if I am wrong as I have only worked on a 90 4g63, but a 91 shouldn't have a crank trigger plate. Isn't that a 2g thing?

This info would be helpful before I start, does anyone know?

 

[NOSLO2PT0]

The crank trigger plate is on both the 1G and 2G. It's the flat plate located behind the crank sprocket that has the notch in it, to help you located TDC on the crank, using the mark on thefront case.

 

[MY1GDSM]

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THIS ^
Not to be confused with an Crank Position Sensor on a 2g... .

 

[dsmcoder]

I will be checking out the problem this weekend, the belt looks like it has a very light wear mark less then 1/4 of an inch wide on the engine side, would the crank trigger plate cause this?

 

[MY1GDSM]

I'm not sure if anyone said this before above.

But, If you install a wrong length bolt in one of the oil pan holes on the timing belt side it can cause this...

 

[dsmcoder]

I have never took the oil pan bolts off before but the last owner did, the mark wasn't visible on the last timing belt, could that still be the problem?

 

[NOSLO2PT0]

Yes. There are 3 bolts that are shorter than the rest. Those have to go into the front case where it supports the oil pan.

 

[dsmcoder]

I am going to take a look under the timing cover today, is there anything else I should look for?

 

[dsmcoder]

I took all the belts off and started it and the noise went away. So I put all the belts back except the A/C belt and the noise was still gone.

Is there anyway I could fix the a/c pulley or will I have to buy a new unit?