Gold FFM johnpwalsh 1,317 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 On 06/02/2019 at 10:27, Clive59 said: John, if you go into the Play Store app on your phone, you can get it there. If you haven't used Play Store before, do so. It has all sorts of good stuff(and lots of crap of course). If you just search the apps on your phone you will find it. Got it Clive, thanks. Looks like a handy bit of info. Quote Link to post Share on other sites
Clive59 112 Posted February 9, 2019 Report Share Posted February 9, 2019 2 hours ago, eeyoreish said: What frequency is recommended for the round toothed belt on the HC? This might help, there is a copy on this forum somewhere, but in summary, seems 100-110Hz is about right. 9XX Timing Belt Tension - Manual Notes - JH to Turbo.docx 1 Quote Link to post Share on other sites
eeyoreish 837 Posted February 9, 2019 Author Report Share Posted February 9, 2019 OK, so using the Gates app this morning I consistently measured 92-93Hz over a few attempts. Thats on the inlet to aux pulley section of belt, with engine at 30 deg before TDC, engine hasn't run for a week, temperature in the garage is about 10deg C. As I understand it with the ambient temp lower that the 'ideal' 15-25 C I should expect a slightly looser belt/lower reading, which is what I have. I think I conclude therefore that the belt tension is OK and certainly not too tight. Do you expert folk concur? Quote Not worth starting anything now... Link to post Share on other sites
eeyoreish 837 Posted February 9, 2019 Author Report Share Posted February 9, 2019 Just ran the engine up again now. Maybe it’s me but the noise, whilst still there, doesn’t seem quite so prominent today. Spraying a little WD40 on the belt doesn’t seem to alter it. Closer analysis of the spinning inlet pulley shows that the outer rim is running true with no flats or buckle. The inside rim is though running slightly out of round, as is the hub of the pulley where it’s attached to the cam (even though the end of the cam is running true). I don’t know if that’s common? i.e the inner part of the pulley isn’t necessarily machined perfectly round? Hard to see how the inner part could be buckled without it affecting the outer rim. Concerned I could be focusing on something that’s been there all along... Im going to balance up the carbs so it’s running more smoothly. Big question is do I drive the car like this or continue trying to investigate this noise?? And where would I look next? Quote Not worth starting anything now... Link to post Share on other sites
Gold FFM Barrykearley 6,546 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 I’d not have sprayed WD40 on the belt - but now you have - give the bearings a quick blast with the stuff Quote Only here once Link to post Share on other sites
eeyoreish 837 Posted February 9, 2019 Author Report Share Posted February 9, 2019 Only sprayed a touch on the advice of a mechanic friend to see if it altered the noise at all. It didn’t. Which bearings should I be lubricating? The tensioner is new, as are the alternator bearings. The good news is that having not run for a week I got oil pressure showing on the gauge within 5 or 6 seconds of starting so it looks like the original problem is solved at least. Quote Not worth starting anything now... Link to post Share on other sites
Gold FFM Barrykearley 6,546 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 I’d be suspicious of any new bearings - the noise wasn’t there before I’m assuming- and it is now. A dry bearing will whine give them a light whack with the wd Quote Only here once Link to post Share on other sites
Sparky 2,753 Posted February 9, 2019 Report Share Posted February 9, 2019 The tensioner bearing is sealed; spray lubricant shouldn't help, but if it does (and it would only be temporary - seconds), you have a problem. Quote British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland. And Shitfaced Silly Sod to Sweden. Link to post Share on other sites
Gold FFM Barrykearley 6,546 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 Yep - and noisy tensioner bearings are a well known thing sadly Quote Only here once Link to post Share on other sites
eeyoreish 837 Posted February 9, 2019 Author Report Share Posted February 9, 2019 The problem is that I did have a whine, but the old tensioner bearing was well knackered so it was probably that. What I don't know is whether the current whine is the same one and/or existed before, possibly masked by the tensioner noise. I pressed on the new tensioner myself and it felt fine when I put it on. Why is nothing straightforward..? Quote Not worth starting anything now... Link to post Share on other sites
Gold FFM Barrykearley 6,546 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 On the positive side - you have good oil pressure 1 Quote Only here once Link to post Share on other sites
Popular Post eeyoreish 837 Posted February 9, 2019 Author Popular Post Report Share Posted February 9, 2019 Ignition timing checked and carbs balanced and she's running like a dream. Smooth at tickover, pulls well, good oil pressure from cold (builds on the gauge in 5-6 seconds) and at hot tick over. The mystery whine is still there but having driven the car up the road it is definitely not the whine I could hear before, which must have been the belt tensioner. All I can hear in the cabin now is what sounds like a bit of belt whine as the revs rise which has always been there. I'm concluding therefore that the noise I can hear in the engine bay has likely always been there and I've just never been so paranoid about strange noises as I am having had the thing in many bits. In summary I'm considering it fixed and back in service until it breaks again... 3 1 Quote Not worth starting anything now... Link to post Share on other sites
Gold FFM Barrykearley 6,546 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 Brilliant result - tick in the box Quote Only here once Link to post Share on other sites
Popular Post eeyoreish 837 Posted February 9, 2019 Author Popular Post Report Share Posted February 9, 2019 Sorted mainly thanks to the help and advice on here (and over the phone!). Sometimes it's just what you need to give you the confidence to keep going 4 Quote Not worth starting anything now... Link to post Share on other sites
Gold FFM Popular Post Dan E 1,447 Posted February 9, 2019 Gold FFM Popular Post Report Share Posted February 9, 2019 1 hour ago, eeyoreish said: Ignition timing checked and carbs balanced and she's running like a dream. Smooth at tickover, pulls well, good oil pressure from cold (builds on the gauge in 5-6 seconds) and at hot tick over. The mystery whine is still there but having driven the car up the road it is definitely not the whine I could hear before, which must have been the belt tensioner. All I can hear in the cabin now is what sounds like a bit of belt whine as the revs rise which has always been there. I'm concluding therefore that the noise I can hear in the engine bay has likely always been there and I've just never been so paranoid about strange noises as I am having had the thing in many bits. In summary I'm considering it fixed and back in service until it breaks again... Neil don’t talk to me about being paranoid about strange noises, a year or so ago I pulled up at a set of lights in the TE and seriously shat myself at this buzzing sound, it sounded catastrophic. I sat there thinking this is it and the thick end of 10k, switched the car off still the same sound, looked around and it was someone with a petrol hedge trimmer strangely cutting his hedge. He obviously has never owned a Lotus 4 Quote Link to post Share on other sites
eeyoreish 837 Posted February 9, 2019 Author Report Share Posted February 9, 2019 I'm a bad person. I did 'borrow' a couple of bits off the nice TE engine under the bench. I did leave an IOU note though so I think it's OK. 1 Quote Not worth starting anything now... Link to post Share on other sites
Gold FFM Dan E 1,447 Posted February 9, 2019 Gold FFM Report Share Posted February 9, 2019 Not “THAT” TE engine. You will go to hell my friend 2 1 Quote Link to post Share on other sites
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