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Post by Joepublic on Dec 22, 2012 8:54:36 GMT 1
The car in question is too old for dual mass flywheel
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rebel
New Member
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Post by rebel on Dec 22, 2012 15:45:49 GMT 1
The car in question is too old for dual mass flywheel The clutch centre plate will almost certainly have a spring damped hub though, amounting to the same effect. |
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Post by Joepublic on Dec 22, 2012 18:29:30 GMT 1
The car in question is too old for dual mass flywheel The clutch centre plate will almost certainly have a spring damped hub though, amounting to the same effect. 12 degrees? There will be lash in the gearbox and diff, drive shafts, movement in wishbones and engine gearbox mountings too. |
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Post by krashbandikoot on Dec 23, 2012 11:22:23 GMT 1
The chain tensioner is normally pressurised with the oil I've never heard/seen this one before. All the chains I've done have a mechanical sprung loaded tensioner that's adjusted on a screw or bolt. Alternatively it's been a spring loaded wheel similar to a fabric timing belt. As for bump starting, I've always found 2nd or reverse to be the ideal gears and not to go faster than 5 or 10mph otherwise it causes problems by stressing out other bits and pieces due to the reverse torque being applied to turn the engine over by 'force' |
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Post by bigdave95 on Dec 23, 2012 21:17:09 GMT 1
The chain tensioner is normally pressurised with the oil I've never heard/seen this one before. All the chains I've done have a mechanical sprung loaded tensioner that's adjusted on a screw or bolt. Alternatively it's been a spring loaded wheel similar to a fabric timing belt. As for bump starting, I've always found 2nd or reverse to be the ideal gears and not to go faster than 5 or 10mph otherwise it causes problems by stressing out other bits and pieces due to the reverse torque being applied to turn the engine over by 'force' i know the vw 3cyl chain is oil pressure fed, it even advise's against bump starting in the Fabia's Handbook  |
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Deleted
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Post by Deleted on Dec 23, 2012 21:18:02 GMT 1
The chain tensioner is normally pressurised with the oil I've never heard/seen this one before. All the chains I've done have a mechanical sprung loaded tensioner that's adjusted on a screw or bolt. Alternatively it's been a spring loaded wheel similar to a fabric timing belt. As for bump starting, I've always found 2nd or reverse to be the ideal gears and not to go faster than 5 or 10mph otherwise it causes problems by stressing out other bits and pieces due to the reverse torque being applied to turn the engine over by 'force' Yes and often with the wrong oil , |
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Post by bigdave95 on Dec 23, 2012 21:20:52 GMT 1
I've never heard/seen this one before. All the chains I've done have a mechanical sprung loaded tensioner that's adjusted on a screw or bolt. Alternatively it's been a spring loaded wheel similar to a fabric timing belt. As for bump starting, I've always found 2nd or reverse to be the ideal gears and not to go faster than 5 or 10mph otherwise it causes problems by stressing out other bits and pieces due to the reverse torque being applied to turn the engine over by 'force' Yes and often with the wrong oil , i know Skoda (presumably VW and Seat do aswell),say you must use 0w/30 in the 3 cyl  |
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french crap fanatic
Apprentice
french car specialist based in dagenham east london
Posts: 3,355
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Post by french crap fanatic on Dec 23, 2012 21:27:00 GMT 1
earlier this year i had to replace the engine on a tranist 2.4td becos the driver hadnt waited a few seconds after starting to let oil pressure build up before driving off. the chain jumped and caused a lot of damage,the van had done 180k and driver was late that morning. so a bump start on this vehicle probly would have done the same damge!!!  |
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Deleted
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Post by Deleted on Dec 23, 2012 21:27:52 GMT 1
Yes and often with the wrong oil , i know Skoda (presumably VW and Seat do aswell),say you must use 0w/30 in the 3 cyl if you study the oil feed hole in some tensioners they can be as small as half a mill from new ,dont take much to restrict them and then the chains get blamed for wearing !!! |
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Post by krashbandikoot on Dec 23, 2012 21:48:47 GMT 1
I seriously didn't know some chain tensioners were oil pressured. Ya learns something new every day ;D
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rebel
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Post by rebel on Dec 23, 2012 22:50:03 GMT 1
I seriously didn't know some chain tensioners were oil pressured. Ya learns something new every day ;D Over the last 10 to 15 years I would say most, rather than some. |
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rebel
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Post by rebel on Dec 23, 2012 23:08:05 GMT 1
I should add that virtually all oil pressure fed chain tensioners have a mechanical (usually ratcheting) device to stop the tensioner collapsing when no oil pressure.
When starting an engine and you hear the chain rattle for a second or two (before the oil pressure rises), It's usually this ratcheting mechanism within the tensioner that has failed.
It's a very common problem on Transits.
Never ever turn a Transit engine backwards, I've known heads to get destroyed by simply bolting a clutch or flywheel on and the chain slipping.
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Post by krashbandikoot on Dec 23, 2012 23:47:23 GMT 1
Over the last 10 to 15 years I would say most, rather than some. Ahhh that'll explain it then, most of the cars I've worked on are pre 2000 and the only "new" bike I work on is at work. Most of the time I'm working on bikes that are usually carbed and aren't later than '99 |
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Post by Monkey on Dec 26, 2012 20:46:14 GMT 1
I wouldnt bump a VW chain driven crap, last one i built the chain jumped every time i turned it over to check the valve timing as there was so much chain slack when tensioner dry of oil. (1.4/1.6 FSI) So i bolted it back together and wound it round on the starter until it started (with everything crossed!) It was mint |
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Post by Monkey on Dec 26, 2012 20:49:56 GMT 1
earlier this year i had to replace the engine on a tranist 2.4td becos the driver hadnt waited a few seconds after starting to let oil pressure build up before driving off. the chain jumped and caused a lot of damage,the van had done 180k and driver was late that morning. so a bump start on this vehicle probly would have done the same damge!!! I wouldnt put that down the cause of the failure, the tensioner ratchet fails and the chain falls off anyway ;D |
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