Noisy timing belt tensioner ????? - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 26 (permalink) Old 06-14-2019, 03:48 PM
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Well, I am tracking down a noise that I am suspecting could be the tensioner. I have spent countless hours trying to find a piece of metal or something loose that is causing this. Even replaced the exhaust (cat back, it needed it anyway). I have bent shields, and small brackets thinking I had found the issue but haven't. It is particularly loud when you pass something flat like a fence or drive near a wall. Seems the same loudness on both side. Kinda seems to be coming from the front of the engine. Turning on the a/c does not affect it. It sounds just like a loose pipe clamp on an exhaust pipe or a washer or coin on a frame part etc. Dropped the plastic pan hoping I would find something but nope. Blue belt installed about a year ago but didn't replace the tensioner bearing. Where is the best place to get one? Would be great if I could find one I could just order online as opposed to having to call one of the specialist next week and wait for shipping from CA. Anyway, here is the video. You can hear the rattle. Thanks for any info;

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post #22 of 26 (permalink) Old 06-14-2019, 06:50 PM
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Sounds like a resonant rattle rather than a squealing bearing, but can't think of anything up front that would sound like that.
Only fitment I know of for the bearing was a UK 2.4 Ford Transit diesel, so I'm guessing it will be from a specialist, a bearing house or Ebay UK. Genuine SKF or Flennor bearing harder to find, there's lot of cross references out there.

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post #23 of 26 (permalink) Old 06-14-2019, 06:54 PM
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Yeah, I swear it sounds like a rattle but can't find it for the life of me. I think I will put it on jackstands with the pan off and get under there with a hose to my ear to try to find it. This is driving me nuts!
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post #24 of 26 (permalink) Old 06-15-2019, 09:13 AM
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You might try squirting water at different spots and not just blasting the whole area with a water. You may be able to pinpoint the source that way. A mechanic's stethoscope may also be useful. A short piece of hose held to your ear might work too. Just be careful of your fingers and all the moving parts. As suggested you can also start by removing an accessory belt to narrow down the possible sources. Overtightenting a belt can shorten the life of bearings so too tight is almost as bad as too loose. Or you can wait till the source of the noise makes itself obvious. Noises typically get a lot worse and by then you will see obvious signs like metal shavings. Not a good idea if it is the tensioner though. If it seizes up and throws the belt you will mess up the engine. If the noise varies with the speed of the motor and not the speed of the car (or you hear it when the motor is running with the car parked) it is safe to assume the noise is coming from the motor. On my V-8 the right side tailpipe had a crack and at certain engine speeds it would resonate and rattle and at other speeds you wouldn't hear it.
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post #25 of 26 (permalink) Old 06-15-2019, 11:13 AM
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Thanks for the info. I have a borescope coming today so I can look around the front of the engine and in all the nooks and crannies. Next step will be putting it on jackstands with the pan off and running with the rubber house to my ear and poking around. I already tried the hose putting it down in front of the engine from the top but got nothing. I wasn't able to get very far and not being able to see didn't help. I really don't think it is a bearing but already lost a timing belt and had to deal with the bent valves etc so I am just trying to be extra cautious.

It really seems to be vibration related. Different RPM causes a louder or "faster" rattle but isn't consistent. While moving and I put the clutch in a coast, as the rpms go down you can year it resonate with the rpms then when it gets to idle it goes away. I really feel like something has come loose or fallen down like a washer etc and is sitting on some metal surface. I wish I could just pick it up, turn it upside down and shake it! LOL. Well, I will report back if I find the source.
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post #26 of 26 (permalink) Old 06-15-2019, 12:46 PM
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AHHHHH!!!! Power steering pump tensioner bolt!
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