1G Timing belt help

[falcon8r]

Hi all, I am currently doing a timing belt on my talon.

When I get it all put together and get the belt tight, it is a tooth off the TDC mark at the crankshaft washer. It is either 1/4" retarded or advanced. Never will it line up on the money.

I thought to maybe tune the RPM this way but then I quit and here I am.

The belt is a Gates 167 blue. Thanks, If I was seriously degreeing this engine in , I would think to up the idler pulley diameter some. That's not likely. Help... Tres....

 

[DSM1G90]

You're gonna have to keep working with the autoadjuster until all marks DO align perfectly up.. no "if's" and "buts" about it.

You might have to loosen it up a bit, tug and pull on the belt here and there, and get the auto adjuster to have the required gap between tang and housing..

Sorry, it took me 3 plus hours to finally get all of my marks aligned up perfectly..

-DSM

 

[fst_4g63]

Follow the vfaq, the removal process is the big thing. If everything was not perfect when removed, then it's a little adjustment. Good luck If you cant figure it out call someone who can honestly.

Darren

 

[steve]

The trick is in making sure you remove all the belt slack as you put it on.

Start at the exhaust cam and put the belt on it and clip it into place so it won't slip.
Line the exhaust sprocket timing mark with the mating line between the head and rocker cover. On the intake sprocket back it up about a half tooth and put the belt on it and clip it. The half tooth is just to make it easier to get the belt on the sprocket. Now move the intake to it's timing mark amd make sure the belt is tight. If you can move past the timing mark then it's not on right, fix it.

Do the same for each sprocket. Pull the belt as tight as you can, turn the sprocket counter clockwise a bit to ease getting the belt on and then turn it clockwise to it's mark to make sure it's tight and your on the right tooth. After doing the crank, all the slack will be between the crank and exhaust sprockets and you take it up with the tensioner pulley, rotating it either clockwise or counterclockwise depending on the engine type to take up the slack and preload the timing belt.

None on the sprockets should move when you do this because you have already taken up the slack between each. If your marks don't line up you slipped up somewhere. Start over.

 

[falcon8r]

I have done at least a half a dozen dsm timing belts. When it put tension on the crank in a clockwise direction, all the marks line up perfectly except the crankshaft. It is just a little advanced or retarted depending on what tooth it's on. Is the 167 rb belt a tiny bit longer/ shorter?? Makes no sense to me. I would think this belt would not streach at all. I am going to tdc and degree the engine now as I do have dials and sutch. I am scratching my head and really appreciate your help. Tres...

 

[steve]

If you do it my way it's not possible for it to be off when your done.

Now you can still have an issue with the cam alignment if you have cut the block and head down but that will be less than one tooth and means that the cam sprockets won't be exactly matching once you pre-load the belt. To fix that you need adjustable cam sprockets and will have to degree the cams.

 

[falcon8r]

If you do it my way it's not possible for it to be off when your done.

Now you can still have an issue with the cam alignment if you have cut the block and head down but that will be less than one tooth and means that the cam sprockets won't be exactly matching once you pre-load the belt. To fix that you need adjustable cam sprockets and will have to degree the cams.

Well this may make sense, as it is a rebuild and the cams are different, I just installed some Deltas. If the cams are slightly off of each other, the crank is right on.

I have done some race engines in a V8 style and degreed in some big roller cams. But that's just one cam. How serious is it for my little street car to indexed all the cams and sutch. I do have all the equiptment to do this but I dont want to eek every last hp out this thing or spend a whole day with my dials and wheels. Thanks again, what comes around does help. Tres....