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| Timing chain- One tooth out | |
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| Tweet Topic Started: Tue Sep 5, 2017 7:45 pm (216 Views) | |
| Russ_90 | Tue Sep 5, 2017 7:45 pm Post #1 |
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Newbie
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Hi all. Got myself in a bit of a pickle after changing head gasket on a 2.0 petrol. After reassembling everything I did a quick rotation check and after two revolutions the the marks on the chain and cam sprocket are one tooth out; I obviously got the tension wrong somewhere or allowed the chain to move during assembly. So my question is how do I realign the chain, cam sprocket and crank pointer to TDC? Can I turn the crank with the cam sprocket removed and not hit the valves with the pistons? Thanks in advance. Edited by Russ_90, Tue Sep 5, 2017 7:46 pm.
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| Russ_90 | Tue Sep 5, 2017 8:58 pm Post #2 |
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Newbie
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So I thought I'd reset everything and just did a complete rotation and the marks are misaligned again...WTF! Would incorrect tensioner setting cause it to index by one tooth each turn? Edited by Russ_90, Tue Sep 5, 2017 8:58 pm.
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| Cockney21 | Wed Sep 6, 2017 10:17 am Post #3 |
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Part of things
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Not done a 190 chain but from experience you need to make sure the chain is tensioned on the "driven" side of the sprockets. Are you saying the marks are moving one tooth every turn of the engine, or is it just one tooth out regardless of the number of crank turns. |
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| The Gorilla | Wed Sep 6, 2017 11:45 am Post #4 |
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Part of things
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Hi, You can get the same issues with a 16v Chain. I guess your aligning the Timing Marks and when you fit the Chain tensioner as it takes up the slack, the timing goes out. As said above, you need to make sure that the Chain is fully tensioned on the Intake side, so that the only slack taken up when the Tensioner is fitted is on the exhaust side so that the Cam and Crank are not able to rotate. Any slack in the chain from the Cam down to the crank Cog on the Intake side will always result in timing out when Tensioner is fitted. Regards, The Gorilla. |
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| Russ_90 | Wed Sep 6, 2017 7:50 pm Post #5 |
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Newbie
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Gorilla/Cockney thanks for your responses. Through a combination of your advice and that of MBS in Southampton (thanks guys) I've sorted it. Too much slack on drive side and incorrect tension on the chain were the culprits. Should have checked the tensioner properly as the clip had jammed and even though I'd torqued it properly it wasn't tensioning correctly. All sorted now and hoping for a start tomorrow so fingers crossed...should be ok as I've turned it over about 30 times to check
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