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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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cambelt jumped a tooth.Views : 26877 Replies : 286Users Viewing This Thread : |
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Feb 20th, 2010, 23:56 | #21 | |
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Feb 21st, 2010, 17:19 | #22 |
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So why the elongated bolt holes on cam pulleys?
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Feb 22nd, 2010, 17:44 | #23 |
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If you feel confident enough, I would remove the belt (lock it up first) and see if you can get them marks spot on ie turn it back a tooth, once you have done this and retensioned belt, turn over by hand twice and see if all lines up again, sometimes an engine can look a tooth out but when you go to put it back a tooth its miles out meaning it was right in the first place, have you checked the tensioner for play or and idler pulleys if there is any?
As I say if after you have moved it back a tooth and it all lines up better than before after turning it over by hand cranking twice, then i think you would have solved it!
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Feb 22nd, 2010, 18:07 | #24 | |
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Feb 22nd, 2010, 19:50 | #25 |
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to allow the cams to move on the pulleys slightly if the belt is installed while installing the locking tool.
the locking tools at the crank and cams are required when reinstalling a head or if a front cam seal has been replaced,the cam pulleys are fitted finger tight so they can spin freely on the cams then the belt is tensioned then the 3 bolts are tightened,this only needs carrying out as mentioned or if the front pulley bolts have been loosened and you suspect a cam has moved. changed about 100 cam-belts over the years on Volvo's and so long as you align the marks (that can be half a tooth out as per photo) and make your own tipex marks then you cant go wrong,the tools aren't required as its been set (valve timing) at the factory.
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Feb 22nd, 2010, 20:52 | #26 | |
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Feb 22nd, 2010, 21:05 | #27 |
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Right there is absolutely no need to slacken the cam bolts to tension the belt I have dont alot of these timing belts in my time,there are also no specialised tools required.
As for the elongated holes I have seen none on this engine,and when checking the bottom timing mark the crank shaft pulley has to be removed to see the mark behind it. this information comes from the new autodata cd I have recently recieved so if its wrong then so is every other garage lol laurence |
Feb 22nd, 2010, 21:13 | #28 | |
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volvo 850 2.5 and she smokes. Last edited by lou; Feb 22nd, 2010 at 21:19. |
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Feb 22nd, 2010, 22:02 | #29 |
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You dont need to literally lock this engine, just make some nice clear marks I use tippex it doesnt have to be on the timing marks themselves just mark your own points, as long as they are easy to see, just get your crankshaft at TDC as in your pics, then make the marks onto the pulleys and onto the cover, its just so basically if it moves when removing the belt you can at least put it back where it was, but try and get those original marks to line up better, it may be a long way out after you move it one tooth, that way you will know it was right at first, when I first started doing timing belts, sometimes after I fitted the new belt I would spend ages trying to get the marks spot on but a lot of times it would never be dead on the mark but if i tried a tooth either way it would be obviously out, so i would set it on the tooth i could get the closest to it, dont forget to rotate the crank twice to bring it back to TDC by hand and re-check all the marks, This is very important!
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Feb 22nd, 2010, 22:28 | #30 | |
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