Timpreza Posted February 25, 2019 Share Posted February 25, 2019 My K-series 1.8VVC, 5 speed is having trouble to shift gears in the higher revs. It's a hard push and it takes a while to get in gear. No weird noises, just hard and slow. It's ok in lower revs, but it happens every time and in every gear when trying to rev it out above 6000rpm. Link to comment Share on other sites More sharing options...
John Vine Posted February 25, 2019 Share Posted February 25, 2019 Hmmm...bit like that piece of string...Some initial thoughts: clutch drag, synchros, selector fork/detent, gear lever lube, g/box oil level/type/grade.Personally, I'd start by making sure the clutch operates smoothly and disengages positively. Is it hydraulic on that model?JV Link to comment Share on other sites More sharing options...
Timpreza Posted February 25, 2019 Author Share Posted February 25, 2019 It's a cable clutch. Clutch feels fine when driving. Bites when it should, disengages seemingly without drag. Gear oil has been topped up with 75w90 this weekend, but we didn't manage to extract the old oil. Last drain was 4y, 15000km ago. My guess it's something with the synchro's or forks, but shouldn't that affect only some gears? Note: The engine has been swapped 2y ago and only recently got the correct ecu. (Long story) The gearbox never saw more than 140bhp at 6500rpm before this winter, now it takes 160bhp and 7200rpm. Could it be a matter of running in? Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 25, 2019 Share Posted February 25, 2019 When you say swapped, do you know if it had the appropriate spigot bearing installed in the end of the crank? Caterhams use a sleeve and a ford bearing.If it was a caterham supplied engine you should be OK, if it was from a scrap yard then it would have needed a new spigot bearing and sleeve.That said, the ford spigot bearings have been known to fail too!Ian Link to comment Share on other sites More sharing options...
elie boone Posted February 25, 2019 Share Posted February 25, 2019 Make sure it's GL4 gearbox oil u use. Link to comment Share on other sites More sharing options...
Timpreza Posted February 25, 2019 Author Share Posted February 25, 2019 Good point, I don't know. It's a scrap MG engine, swapped by a mechanic that's done VVC swaps before. Apparently it fits... How can I tell the difference? Anyway, engine out next week, so I'll know more then. Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 25, 2019 Share Posted February 25, 2019 The bore of the spigot bearing should be a few thou bigger than the end of the gearbox input shaft. ;-)Ian Link to comment Share on other sites More sharing options...
Timpreza Posted February 25, 2019 Author Share Posted February 25, 2019 @ Elie: The bottle says it's Kroon 75w90 'GL4/5'. I knew it needs to be 4, and I assume it was either 4 or 5. This one appears to be both?! Link to comment Share on other sites More sharing options...
elie boone Posted February 25, 2019 Share Posted February 25, 2019 Timpreza, i guess the oil u used is synthetic or semi, i only use mineral oil GL4 spec https://www.kroon-oil.com/en/catalogue/gear-oils_manual-transmission-oils/330/gearlube-gl-4-80w-90/722/ Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 25, 2019 Share Posted February 25, 2019 syphon the oil out and refill with 1.2 ltrs of Redline MTL, GL5 oil is too slippy and give the syncros a really hard time.also check and lube the gearlever spherical joint, and check the black nylon or brass collar on the selector shaft is free moving and lube with a little grease Link to comment Share on other sites More sharing options...
SM25T Posted February 27, 2019 Share Posted February 27, 2019 Get rid of GL5 oil. Use GL4. It may be the spherical bearing on the gear lever is dry and heat is making it stick. Run some oil down the gear lever and work the lever to get it into the bearing. Link to comment Share on other sites More sharing options...
Timpreza Posted March 2, 2019 Author Share Posted March 2, 2019 This spigot bearing looks like it might be the problem. The bearing just fell out the crankshaft. It might have caused a vibration at high revs, making it hard to get to the next gear.Other than that there are no noticeable faults to clutch or gearbox, synchro's look fine. Link to comment Share on other sites More sharing options...
revilla Posted March 2, 2019 Share Posted March 2, 2019 Was there a spacer sleeve between the bearing and the crank? There should be, and they're usually seriously tight, certainly shouldn't fall out! Link to comment Share on other sites More sharing options...
Timpreza Posted March 19, 2019 Author Share Posted March 19, 2019 It's all fixed now after adding the sleeve on the spigot bearing. Thanks for the advice guys. Link to comment Share on other sites More sharing options...
SM25T Posted March 19, 2019 Share Posted March 19, 2019 Phew Link to comment Share on other sites More sharing options...
rj Posted March 20, 2019 Share Posted March 20, 2019 Never ever use a combined GL4 / GL5 oil.It won't work. Link to comment Share on other sites More sharing options...
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