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since camshaft acceptable runout is generally around 0.0008" or less, i would never attempt to pry the belt back on using one like that. i'm kinda picky though. i'd literally throw out the ones by your keyboard because you stored them horizontal instead of standing on end.
Last edited by rob342; 07 Sep 2015 at 05:57 pm. |
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Hello!
I was wondering if anyone has tried this? I'm thinking about trying it but I've been advised that getting the timing belt back on would be a difficult if not impossible task unless the tensioner is loosened first. |
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I don't think it would work unless the tensioner is removed first... I don't think even having the tensioner in the off-tension position would do it.
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And like I said in my write up, I've not tried this on a running PT, just a salvage car. So you would have to attempt it as your own risk. But in truth, there's not much risk. The torque on the camshafts is minimal and if you can't make it work, the remedy is to do simply do the job the routine way. If I had a good timing belt and just needed to change the head gasket, I would definitely try this method first. And of course, what might work for me might not be feesable for everyone else. My tolerance for risk and ability to recover from loss is a little higher than some folks.
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![]() Last edited by Handy_Cruiser; 21 Jun 2019 at 03:43 pm. |
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exactly what rob said. and the caps would be destroyed, definitely on reinstallation.. as would the head journals... as would the cam shaft seals. even trying to shortcut some cams out of a junkyard motor- you would be better off just crow barring off the wheels first, but even that would screw up the cam...
please, no more short cut threads. it is not good advice. |
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At my job, I try to surround myself with people like Rob if I can find them. Having an unusually high amount of fluid IQ causes many people, like Rob, to gain a lot of static IQ during their lifetime. This happens to some extent even for people with an average amount of fluid IQ. This is why some really stupid young people mature to become fairly intelligent adults. The down side is that we all lose fluid IQ as we age. So for someone with a career like mine where I basically get paid for my intelligence, it's always good to surround yourself with younger people with lots of fluid IQ. And it's a good idea even here on an internet forum. When Rob gives his opinion, I consider it closely even if I disagree on the face of it. And even when I end up rejecting his opinion, I usually end up learning more myself. I never take Rob's opinions lightly when he's being sincere. I cannot guess at your fluid IQ. But I value your opinion just the same. And I will continue to post all the shortcuts and other things I am interested in. And as always, your input is welcome. ![]()
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![]() Last edited by Handy_Cruiser; 21 Jun 2019 at 09:32 pm. |
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Some short cuts from the factory recommend procedures have some merit to think about but this one about the cams is not one of them. There are way to many human and mechanical as well the "GOD" factor variables that can and most often will go wrong attempting them.
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A thought on this, after marking the positions:
Why not losen the sprocket screws as long as the belt is in place, then remove the tension, remove the belt, remove the sprockets, then continue with the procedure as proposed by Todd? That way, there would not be any unusual tension on the camseals... |
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As for letting off the tensioner first, it's very difficult to access the tensioner because it's under the timing cover. As you can see in the photo below, removal of the timing cover involves removal of the engine mount. And that's the hardest part of this job because it involves jacking the engine up pretty high to get at it. ![]() If we have to go that far, we might as well do the job by the standard method. ![]() The magic if trying the method I've described is that it involves none of this. You don't even have to lift or get under the car. It turns a fairly complex 8 to 16 hour job at home into a 1 hour job. The problem doing a job like this to completion is that it's only going to be useful in a few instances such as when you already have a good timing belt but have a blown head gasket or when installing performance camshafts. To be exact, it was while removing and reinstalling my performance cams several times to correct a valve training issue that gave me the idea. ![]() Right now I'm working on a number of home improvement projects. But I have a growing box of parts to detail my PT's engine bay. When and if I do that, I may remove and reinstall the cams just to show it can be safely and done. And maybe I'll do some light performance cams when I do it. In the meantime, this is just an idea to discuss. The anonymity of the internet sometimes cause more timid people to be argumentative, petty and even cruel. But the exchange of ideas can be a good thing if our skin is thick enough. And everyone's opinion is welcome. ![]()
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