colin3511 Posted May 28, 2018 Report Share Posted May 28, 2018 Hi, Having spent hours stripping down a fully rebuilt engine to locate a tapping noise I am still none the wiser. The noise seems to resonate from the metering unit. I have pinned the drive gear and checked the clearance. Has anyone experienced something similar and would the metering unit make such a noise? Thanks, Colin Quote Link to post Share on other sites
Rem18 Posted May 28, 2018 Report Share Posted May 28, 2018 Well I suppose there is the noise of the shuttle, however if it was a serious noise it would stop working very quickly??? Quote Link to post Share on other sites
RobinTR6 Posted May 29, 2018 Report Share Posted May 29, 2018 I had one , MU, that is that rattled a bit, audible when bonnet opened, worked for ages like that then started leaking from the rear plastic cover. At the time I was told by those in the know that some 'just do that'..... Quote Link to post Share on other sites
jamesStag Posted June 2, 2018 Report Share Posted June 2, 2018 Hi Colin, oh dear I hope you've not stripped the whole engine down in search of the rattle.... Yes MUs do make a quiet rattle/tap in operation, as others have said it's the shuttle zipping back and forth dispensing fuel to each injector. Quite normal in my experience. Cheers J. Quote Link to post Share on other sites
colin3511 Posted June 4, 2018 Author Report Share Posted June 4, 2018 Hi James. Yes, bottom end strip down to find nothing. Valve clearance checked 4 times now. Car runs really well and only going up to 3000 rpm as newly rebuilt. Out again yesterday and I am convinced it is from the MU area. I am going to swap the MU over today and see what happens. Colin Quote Link to post Share on other sites
jamesStag Posted June 4, 2018 Report Share Posted June 4, 2018 Hi Colin, no probs and sorry you've hunting this rattle about. I'm sure different MUs will be noisier than others. Mine is quiet but there if you listen for it. Obviously all this is subjective. Best way I can think to describe it is if you have engine idling and stand at the drivers (manifolds) side I can't hear anything from the MU. If I walk around to the passenger side, then you can hear the quiet rattle in the background. Of course if you lean down close the the MU, you can hear it clearly. Hope that gives some anecdotal guidance. If you have concerns do speak to Neil Ferguson, as mentioned above. A very knowledgeable and helpful person. Cheers, J. Quote Link to post Share on other sites
Peter Cobbold Posted June 4, 2018 Report Share Posted June 4, 2018 Stethoscope test to locate sound? Quote Link to post Share on other sites
harrytr5 Posted June 6, 2018 Report Share Posted June 6, 2018 Just fitted one and it clacks in operation.This is only the second one I have heard in 30 years or more. Told by the rebuilder this is normal on a precision close tolerance rebuilt metering unit. Regards Harry Quote Link to post Share on other sites
colin3511 Posted June 6, 2018 Author Report Share Posted June 6, 2018 Might be worth checking with Neil Ferguson. He mentioned to me today that there are 3 different designs of inner pin/spool and one can make quite a din. Colin Quote Link to post Share on other sites
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