what the *^&#!), timing belt problems

[IAS92SHO]

Ok, I'm doing the 60k, Got down to the timing belt. I using the instruction off of SHOtimes, working quite well. Rotated crank to line up marks on timing belt with those on the inside of the cover before i took they old belt off. The KOA on the belt is located in the middle of the belt between lines. I then notice the marks on the cam pullies are no where near the lines on the belt at all. So I take a marker and mark where the pulley is and remove the belt. Well as soon as the belt comes off the cams start moving on there own. Could this be why my motor started clattering? Can the belt slip on the cam pullies?
If you look at the attached pictures, the pencil indicates where i marked the timing belt cover and pulley, the screwdriver shows its final resting place, and as you can see the indicator on the cam pullies are way off, and don't even match. How should I proceed ????????

http://www.geocities.com/iascj8/123cam.jpg
http://www.geocities.com/iascj8/456

cam.jpg

 

[fredhurderjr]

Just take a 10mm socket on a ratchet, hook onto one of those bolts, and turn the gear until it lines up with the timing mark at 12:00. The rear cam gear will be JUST on the edge of sling-shotting past the timing mark, but the front should go right to 12:00 when you turn it.

[edit]
or, since you've got the cam covers off, use a
27mm (1 1/16") wrench to turn the cams themselves into position. There are wrench flats on the cams.

Be careful not to damage the cam bearings (or bend a camshaft) by over torquing with the timing belt on. This works with the belt off.

<small>[ January 10, 2003, 11:55 AM: Message edited by: fredhurderjr ]</small>

 

[IAS92SHO]

Well the timing belt is off and both cam pullies need to be rotated different amounts to be in the proper place, which i can do with your described procedure, but what about timing and the crank position?

 

[fredhurderjr]

Rotate the crank gear to the timing mark at 5:00. Put the belt on, locating the 2 top marks, & the lower mark (appropriate one, if using a Gates T-248). Text on belt should be upside-down (readable from driver's side) when standing in front of the engine, like in your pictures.

 

[Deaks2]

Thankfully my drivetrain was more cooperative when I did my 120k...

Gota love how much tension is in those valve springs eh?

 

[fredhurderjr]

BTW, FORGET where your pencil is pointing. It has NOTHING to do with what we're talking about. See the recessed dots (10:00 now on the rear sprocket, & 8:00 now on the front sprocket). Line those up to 12:00 by turning the whole camshaft, not by taking off & turning the sprocket wink )

Put your crank bolt back in the crankshaft & turn it to line the dot on the timing gear with the mark on the engine at 5:00. That lines the rotating assembly & the valvetrain up for proper placement of the t-belt. Then just use the white marks on the t-belt as described already.

I'm not trying to spell it out like you're an idiot, just didn't want any confusion & I kept thinking about your pencil points...

Good luck.

 

[projectSHO89]

Scott Patterson posted a complete set of photos a month or two ago that perfectly illustrated the positioning of the cams, the crank, and the belt. http://www.shoforum.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=17;t=003023#000004

FWIW, as a photo tip, check if your digital camera has a "macro" setting. It will allow you to take closeups that are in focus.

Steve

 

[IAS92SHO]

Thanks for everyones input, last night i thought i'd be required to put in a new engine. The digital camera i'm using was about $50, so that explains the photo quality. It turns out my crank was at 5:00 when I had the timing belt marks lined up with those on the inside of the cover. So this would indicate with the cam pullies in there current place that the timing was off correct? Also with the crank at the 5:00 position couldn't the engine be on the intake or exhaust stroke? just wait to eliminate all my doubts. Thanks again for all your time.

 

[sdpatt]

With the crankshaft pulley's index mark aligned to the mark at 5 o'clock (or the white mark on the damper is aligned with the "0" on the lower timing belt cover) and the camshaft pulley's index marks are at the 12 o'clock position, the number one cylinder is at top dead center. (If the index marks on the camshaft pulleys are pointed to 6 o'clock when the crankshaft pulley index is pointed to 5 o'clock). The valve spring loads on the camshafts are also balanced so that the cams can stay in place when the timing belt is removed. At this position, the white marks on the new timing belt can be used to properly align it during its installation. The key to an easy timing belt replacement is to properly align the crank (white index mark at the "0") and cams (index marks at 12 o'clock) before the crank damper is ever removed.

On a side note, you should use a strap wrench to rotate the cams rather than a socket wrench on one of the bolts. Turning the cams individually is not required if the engine was properly timed and the crankshaft and cams were properly aligned before the old belt was removed.