Comments on: How do I remove the timing chain on a 1975 460 big block? http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/ ChainTools.com Wed, 08 Feb 2012 22:38:41 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Double R http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/comment-page-1/#comment-195 Double R Tue, 09 Jun 2009 10:10:44 +0000 http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/#comment-195 Yes I have been there. It is a 1975 so it has been on there for 33 years. Enough time to build up enough cholesterol to keep it from wanting to come off. But it will with enough persistence. First off spray as best as you can around it with something like WD40 and let it soak. Do this a few times. Then get a soft hammer like a brass hammer. A rubber mallet might not work. But a brass hammer is ideal. Tap all the way around the cam gear like you are trying to actually drive in on, not take it off. But don't hit it too hard because you could actually damage the cam or cam bearings. After you have done that try to pry it off again. If it won't move tap around it again like you are trying to drive it on. Then try to pry it off again. Basically you are trying to "shock" it loose from the cam. This will usually work after awhile. If for some reason it won't. You will have to use a 3 Jaw puller. That would be a last resort. And if the engine is still in the vehicle it could be quite cumbersome to get it in there. I see the last to answerers have said both sprockets need to come off together. I disagree, if the chain has worn enough you should be able to pull the cam sprocket off without moving the bottom sprocket. But the new one may not go on as easy. If you have trouble getting the cam gear loose, wait until you try to get the small crank sprocket off! Yes I have been there. It is a 1975 so it has been on there for 33 years. Enough time to build up enough cholesterol to keep it from wanting to come off. But it will with enough persistence.

First off spray as best as you can around it with something like WD40 and let it soak. Do this a few times. Then get a soft hammer like a brass hammer. A rubber mallet might not work. But a brass hammer is ideal. Tap all the way around the cam gear like you are trying to actually drive in on, not take it off. But don’t hit it too hard because you could actually damage the cam or cam bearings.

After you have done that try to pry it off again. If it won’t move tap around it again like you are trying to drive it on. Then try to pry it off again. Basically you are trying to “shock” it loose from the cam. This will usually work after awhile.

If for some reason it won’t. You will have to use a 3 Jaw puller. That would be a last resort. And if the engine is still in the vehicle it could be quite cumbersome to get it in there.

I see the last to answerers have said both sprockets need to come off together. I disagree, if the chain has worn enough you should be able to pull the cam sprocket off without moving the bottom sprocket. But the new one may not go on as easy. If you have trouble getting the cam gear loose, wait until you try to get the small crank sprocket off!

]]> By: automechtech http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/comment-page-1/#comment-194 automechtech Sun, 07 Jun 2009 03:48:39 +0000 http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/#comment-194 Is the timing chain still on? You have to pull the crank gear and the sprocket off at the same time. You'll have to pry the sprocket with a heel bar little at a time on gear and sprocket. If the chain is still on. Make shure that when you pull the chain, gear and sprocket off the timing marks are aligned straight up and down at the center of the gears. This will leave the crank and cam in the timed position and be easier when you reinstall them back. Is the timing chain still on? You have to pull the crank gear and the sprocket off at the same time. You’ll have to pry the sprocket with a heel bar little at a time on gear and sprocket. If the chain is still on. Make shure that when you pull the chain, gear and sprocket off the timing marks are aligned straight up and down at the center of the gears. This will leave the crank and cam in the timed position and be easier when you reinstall them back.

]]> By: blackheart_987 http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/comment-page-1/#comment-193 blackheart_987 Sat, 06 Jun 2009 23:20:16 +0000 http://chaintools.com/blog/how-do-i-remove-the-timing-chain-on-a-1975-460-big-block/#comment-193 I hope you remove the bottom pulley and the bolt and washer on the crankshaft. You should be looking at two sprocket. the cam shaft and the crank shaft. Now slide both off at the same time, with the chain still on. When the cam shaft sprocket, come off the cam, you can take off the chain. If ether sprocket is hard to move use a pry bar or large ***** driver to mover it just a little and then the other one. you may need two pry bars, one on each side, Work up and down until you have work then off of the shafts. I am thinking that I have seen sone cam sprocket, with threaded holes where you can put the bolts back in them, to push the cam sprocket off the shaft. I hope you remove the bottom pulley and the bolt and washer on the crankshaft. You should be looking at two sprocket. the cam shaft and the crank shaft. Now slide both off at the same time, with the chain still on. When the cam shaft sprocket, come off the cam, you can take off the chain. If ether sprocket is hard to move use a pry bar or large ***** driver to mover it just a little and then the other one. you may need two pry bars, one on each side, Work up and down until you have work then off of the shafts. I am thinking that I have seen sone cam sprocket, with threaded holes where you can put the bolts back in them, to push the cam sprocket off the shaft.

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