David Mirylees Posted April 24, 2017 Share Posted April 24, 2017 Ford Type 9 gearbox in Lotus 7 - Strange noise in third gear. Sound recording here: https://youtu.be/KfmhOXpYKBA (Ignore the video, I just laid the sound byte over it! :-) ) Start off, 1st 2nd then 3rd - odd sound. Beeping is indicator whilst turning. Up shallow hill in 2nd then 3rd - odd sound again until recorder switched off. Noise only appears in 3rd when under load. Any idea as to what may be causing the noise? (Volume needs to be UP to hear it)https://youtu.be/KfmhOXpYKBACheersSolved:After a thorough inspection by Road & Race it was discovered that the 3rd gear selector was bent and there were signs of contact with the 4th gear. A replacement selector and cleaning up of the possible high spots on the 4th gear have meant that the box is now silent! Top marks to Phil at Road & Race 'cos it wasn't at all obvious at first sight. . Link to comment Share on other sites More sharing options...
John Vine Posted April 25, 2017 Share Posted April 25, 2017 Hi David,Did you not manage your trip to Phil Stewart?JV Link to comment Share on other sites More sharing options...
jpringle Posted April 25, 2017 Share Posted April 25, 2017 Hi David, Sounds very much like a gear issue not a bearing problem as its only in 3rd, possibly a tooth damaged, either way its a box out and rebuild needed, good luck,from The Norf, cheers John Link to comment Share on other sites More sharing options...
John Vine Posted April 25, 2017 Share Posted April 25, 2017 ...possibly a tooth damaged...Yes, I think that was the prime suspect when we discussed it at the Red Lion.JV Link to comment Share on other sites More sharing options...
Wrightpayne Posted April 25, 2017 Share Posted April 25, 2017 If you suspect a broken gear I wouldnt drive it. When I bought my 6 speed I took it to SPC for a refresh before fitting it. He found 2/3 of a tooth missing on one of the gears. If the other bit had broken off it would have destroyed the gearboxIan Link to comment Share on other sites More sharing options...
David Mirylees Posted April 25, 2017 Author Share Posted April 25, 2017 Hi JV,Yes, box was with Road and Race first thing on Wednesday am. Unfortunately, at first sight, Phil couldn't see anything amiss but will be stripping it for a thorough examination, Fingers crossed...david Link to comment Share on other sites More sharing options...
David Mirylees Posted April 25, 2017 Author Share Posted April 25, 2017 Cheers, JP,Box came out as soon as I confirmed to myself that it was box related. I wasn't sure as I'd just fitted a brand new Omex Zetec and the box had appeared to be OK prior to the new fit. The noise could have been there before but with carpet fitted and the usual spirited driving it would have been well disguised. (I recorded with carpet out but found with carpet fitted it wasn't so obvious)david Link to comment Share on other sites More sharing options...
David Mirylees Posted April 25, 2017 Author Share Posted April 25, 2017 Thanks Ian,That's why I took everything back out straight away - didn't fancy b%%%%%%ing up the new motor etc when everything may have locked up! Link to comment Share on other sites More sharing options...
Wrightpayne Posted April 28, 2017 Share Posted April 28, 2017 So what was the diagnosis? My money was on the needle roller between third gear and third motion shaft.Ian Link to comment Share on other sites More sharing options...
BlackSeven Posted April 28, 2017 Share Posted April 28, 2017 ...pretty sure there is no needle roller between third gear and the mainshaft? Rob Link to comment Share on other sites More sharing options...
David Mirylees Posted April 28, 2017 Author Share Posted April 28, 2017 Still waiting... Link to comment Share on other sites More sharing options...
Wrightpayne Posted April 29, 2017 Share Posted April 29, 2017 Black Seven - I think you're correct. I'd made an assumption based on the 6 speed having them and carryover of parts from the 5 speed. Looking at a few workshop manual exploded diagrams, it seems the type 9 has plain bearings.Ian Link to comment Share on other sites More sharing options...
BlackSeven Posted April 29, 2017 Share Posted April 29, 2017 Unless one of Steve Perks' excellent Tracsport gear kits has been fitted - then it would have needle roller bearings between the mainshaft and gears.Rob Link to comment Share on other sites More sharing options...
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