ejparrott Posted January 16, 2014 Share Posted January 16, 2014 My 88 developed a new fault on Christmas Eve, it now crunches on downshifting in to second gear. It was fine in the morning when I drove to work, but by the time we got to Dudley that evening we were having problems with it. I've checked the oil and put in about a pint, and that's made no difference. The box was reconditioned 2.5 years ago by AW Transmissions, and installed during our mini rebuild after our accident 2 years ago. Apart from a reluctance to go in to first there's been no other problems with it until now, although every time I've checked the oil level, there has been a quantity of metal on the magnetic filler plug. The drain plug hasn't been out since it was fitted, that's also magnetic. I run Redline GL4 spec oil in it, I think it's MT90 grade. What thoughts on whats died? Quote Link to comment Share on other sites More sharing options...
Diablo Posted January 16, 2014 Share Posted January 16, 2014 Is it any better when warmed up? Does double declutching help? My Lt77 does the same sort of thing, but for 3rd, and Ashcrofts reckon it's a naff synchro mesh. I just double declutch for now, which solves the problem until it's warmed up. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted January 16, 2014 Author Share Posted January 16, 2014 If anything its worse warmed up - I can't be certain, but I don't think it does it at the end of my road, which is the only other downshift to second on my daily journey to work.....that said, I think it does on the return trip when I leave the estate.... Double declutching doesn't make much difference, I've tried it a couple of times and still seem to get the same result. The other suggestion was to raise the revs a little, but that's impossible when also braking. Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 16, 2014 Share Posted January 16, 2014 ej, do you rev match when double clutching on a change down? how bad is the crunch and was the metal coming out a golden, brass colour? Quote Link to comment Share on other sites More sharing options...
Tanuki Posted January 16, 2014 Share Posted January 16, 2014 Any idea where the oil's gone? It can either have leaked [in which case there'll be evidence] or it could have gone through the intermediate seal into the transfer-box [which would imply the bearings for the gearbox output-shaft might not have been holding said shaft firmly and it's been slopping about and worn the oilseal] I'd suggest draining the main gearbox oil and listening for that tinkle of metal-bits. You could have ruptured a synchro. Quote Link to comment Share on other sites More sharing options...
Snagger Posted January 16, 2014 Share Posted January 16, 2014 Our Lightweight did exactly the same thing - all fine when cold, but crunching going down into second once warmed up. It later started just being a bit rough changing down into third and first and crunching when selecting reverse, all only when warm. I tried slipping the clutch to clean the faces and replaced all the hydraulic components in the clutch system to no avail, but somehting was clearly causing the clutch to drag once the engine was warm. It could have been a spigot bush issue. Quote Link to comment Share on other sites More sharing options...
Gazzar Posted January 16, 2014 Share Posted January 16, 2014 Another quick/easy thing to check is the mainshaft nut, in the transferbox. G. Quote Link to comment Share on other sites More sharing options...
Snagger Posted January 16, 2014 Share Posted January 16, 2014 Another quick/easy thing to check is the mainshaft nut, in the transferbox. G. In my case, that was the first item checked - it was tight and locked, and the oil was clean, there was no excess end float on the shafts and no abnormal noise from the transmission. So, if the nut is tight on yours, I'd recommend investigating the clutch. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted January 16, 2014 Share Posted January 16, 2014 After the last but one main box rebuild on my 109" after stripping 1 1/2 teeth off the layshaft 3rd gear i had fitted new 1st, 2nd, 1st/2nd syncro hub & both baulk rings, it then grated into 2nd on a downshift and was worse when warmed up. I lived with it by double declutching. To properly double declutch on a downshift you will have to loose the brake while you raise the revs. Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 17, 2014 Share Posted January 17, 2014 After the last but one main box rebuild on my 109" after stripping 1 1/2 teeth off the layshaft 3rd gear i had fitted new 1st, 2nd, 1st/2nd syncro hub & both baulk rings, it then grated into 2nd on a downshift and was worse when warmed up. I lived with it by double declutching. To properly double declutch on a downshift you will have to loose the brake while you raise the revs. or heel-toe them Quote Link to comment Share on other sites More sharing options...
Pepé le Pew Posted January 17, 2014 Share Posted January 17, 2014 or heel-toe them Have you ever seen the size of my feet? Heel-toeing is not a option in a serie 2a. Just blip the throttle with the clutch out when double cluthing on the downshift. This will speed up the layshaft and then with the clutch in it will smoothly slip into gear. You only have to take your foot off the brake for a fraction of a second. Dropping the roadspeed down as far as possible before downshifting has two advantages. You don't have to speed up the layshaft that much and you have more time to take your foot off the brake. Cheers, Eric. Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 20, 2014 Share Posted January 20, 2014 Have you ever seen the size of my feet? Heel-toeing is not a option in a serie 2a. the series footwell must be one of the bigger footwells about... haha i kind of use the side of my foot to rev match when double clutching. may favorite is double clutch twin sticking with the overdrive i just love it haha Quote Link to comment Share on other sites More sharing options...
Pepé le Pew Posted January 20, 2014 Share Posted January 20, 2014 the series footwell must be one of the bigger footwells about... haha Not on the driver's side in a LHD. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted January 21, 2014 Author Share Posted January 21, 2014 Dropping the roadspeed down as far as possible before downshifting has two advantages. You don't have to speed up the layshaft that much and you have more time to take your foot off the brake.Cheers, Eric. The lower speed the better it is, a problem of course if pulling loaded up hill. I've not had chance yet to try out any of the double declutching options or to check the mainshaft nut. I've got braking issues and I'm trying to get them balanced before I worry about going! If you hold the lever in the gate with a bit of pressure for a few seconds, it also seems to be better. Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 21, 2014 Share Posted January 21, 2014 synchro cone sounds worn to me for sure. the lower speed before changing down obviously matches the layshaft to the mainshaft better. using a double clutch and blip will also help and most likely it wont ever crunch again if you do that. have you got the larger drums on the front by any chance? Quote Link to comment Share on other sites More sharing options...
ejparrott Posted January 22, 2014 Author Share Posted January 22, 2014 11" TLS front drums, 10" SLS rear yes, 1983 model Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 22, 2014 Share Posted January 22, 2014 they are noticeably harder to balance than the 10" drums i just usualy balance the 11" drums by trial and error it can take a while but i have never had a balancing problem with my 10" drum system and also never found it lacking in stopping performance. Quote Link to comment Share on other sites More sharing options...
bill van snorkle Posted January 22, 2014 Share Posted January 22, 2014 My guess with the synchro problem is that the 1st/2nd synchro hub has broken the corners of the slots where the spring and ball sliding blocks ride in. If the sliding blocks twist in the slots they cant evenly push against the bronze synchro cones. The contents of the drain plug should tell the story. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted January 23, 2014 Author Share Posted January 23, 2014 I need to drop the oil don't I.....That'll have to wait until next weekend Quote Link to comment Share on other sites More sharing options...
bill van snorkle Posted February 8, 2014 Share Posted February 8, 2014 I need to drop the oil don't I.....That'll have to wait until next weekend Well this is week end number 2 since that post above. Have you checked the content of the gearbox drain plug yet ? Quote Link to comment Share on other sites More sharing options...
ejparrott Posted February 9, 2014 Author Share Posted February 9, 2014 No I haven't...been trying hard to get The 109 sorted so I can stop using the 88 and really get to the bottom of a whole list of things...so far nothing's changed, and nothing's gone bang....have been driving gently though! If the weather holds, I hope to finish sorting out The 109 this afternoon Quote Link to comment Share on other sites More sharing options...
ejparrott Posted February 9, 2014 Author Share Posted February 9, 2014 Couldn't get to look at it.....damn 109 took all the free time.... Quote Link to comment Share on other sites More sharing options...
bill van snorkle Posted February 9, 2014 Share Posted February 9, 2014 Couldn't get to look at it.....damn 109 took all the free time.... Yes I understand. I have the same problem, and I don't have to contend with floods, sleet and snow ! I just have to contend with the occasional severe case of bone idleness. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted February 10, 2014 Author Share Posted February 10, 2014 I have got to get The 109 sorted....there's so many jobs need doing on the 88, including an overdue timing belt which is starting to make me paranoid! Quote Link to comment Share on other sites More sharing options...
samc88 Posted February 10, 2014 Share Posted February 10, 2014 Mine was crunching a little bit on the weekend going from 3rd to 2nd (probably my inexperience of driving a series) and I had to ease off the revs a little to get it smoothly in gear. Could also have just been me though Quote Link to comment Share on other sites More sharing options...
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