rbrtcrowther Posted October 30, 2011 Share Posted October 30, 2011 :wave:Well here i am, still the same Scammell (unfortunately) but with it's new name and the one it's going to have for the rest of it's life...Good old reliable Dora.. Quote Link to comment Share on other sites More sharing options...
Zero-Five-Two Posted October 30, 2011 Share Posted October 30, 2011 May god bless her and all who drive in her. Did the ceremony involve smashing a bottle over the radiator? Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted October 30, 2011 Author Share Posted October 30, 2011 more like smashing my knuckles on the rear axle when the spanner slipped tonight:-( Quote Link to comment Share on other sites More sharing options...
gritineye Posted October 30, 2011 Share Posted October 30, 2011 Index updated...:-D Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted November 1, 2011 Author Share Posted November 1, 2011 Tonight in the wind and the dark i have managed to sort out the gravity feed to the rear bearing:cheesy: I'ts not been tested yet but it can't not work.. First i drilled a hole in the side of the worm case and tapped it out to 1/2" BSP then i screwed a piece of BSP pipe into the hole. The end of this pipe has been fashoned into a sort of trough with the end blanked off. It protrudes into the worm chamber about 1" just behind the worm. An elbow, pipe and then another elbow take the flow of oil under the influence of good old reliable gravity (no pumps required here thank you) into the rear housing where the pump used to live and hence to the rear bearing...a hole was drilled and tapped in the rear housing to take the elbow. The next mission is to jack it up and run it in various gears and speed to see how much flow we get through the pipe (I do need to do the 37 point shuffle to get it out of its parking spot first though:undecided:) Oh, I took some piccies too.... Look more oil in in the rear case and thats after 15 miles with no oil pump.....and being stood for three weeks. Quote Link to comment Share on other sites More sharing options...
cosrec Posted November 2, 2011 Share Posted November 2, 2011 got to be better than no oil i would say Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted November 2, 2011 Author Share Posted November 2, 2011 That's what I thought. It only really needs a tiny dribble to keep it wet. just think how much grease they put in those sealed rear wheel bearings on new cars. Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted November 6, 2011 Author Share Posted November 6, 2011 (edited) Been busy today in this splendid weather:cool: Blanked off the unused ports on the axle and jacked it up for a test. in the lower gears there is no flow of oil through my scoop system however there is a fair bit of oil held in the rear bearing and after several minutes a very small amount of oil seeped through the bearing into the rear housing. engine speed was a constant 1000rpm for the test in all gears. The oil was stone cold. 4th gear still no oil through the pipe but definitely oil through the bearing. In fact you get a very fine mist being thrown from the bearing so oil is getting through from the worm side (if you could imagine the rooster tail of oil thrown of the crown wheel straight at the rear bearing) We then selected 5th gear and all everything came good. Plenty of oil through the scoop and pipe system and definitely worth the effort of drilling the axle case. I have good piece of mind the the back bearing is receiving plenty of lube. and the flow should increase with speed and with the oil warming up.Something went wrong... the best bit about this video is, I had the wife in the cab ready to hit the clutch just in case it fell of the jacks...As you can see she was like a coiled spring....... Edited November 6, 2011 by rbrtcrowther Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted November 6, 2011 Author Share Posted November 6, 2011 Anyway as said Scammell was pointing the right way it seemed impolite not to take it for a drive, so pup was flung in the cab and off to the beach we went... the wife on the beach... Quote Link to comment Share on other sites More sharing options...
Zero-Five-Two Posted November 7, 2011 Share Posted November 7, 2011 Ain't it satisfying when an idea for a bit of a bodge works out so well. Can't really go wrong with gravity feed. P.S. Nice seaside photo in the twilight. Quote Link to comment Share on other sites More sharing options...
Zero-Five-Two Posted November 7, 2011 Share Posted November 7, 2011 Just read your other post on the work rounds thread. I presume the propshaft repair is still holding together well, now you've done a few miles with less vibration. Bet you keep checking it, just in case? Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted November 7, 2011 Author Share Posted November 7, 2011 Yep all seems well. there are two holes in the prop shaft flange casting that you can see said bolt through and poke your finger in to make sure it's still tight:D Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted February 19, 2012 Author Share Posted February 19, 2012 Right then Fellow Scammell owners.......My gearbox is silent in operation in through all the gears until the top gear is selected...then the whining starts..and it's loud and as we accelerate through 23 mph its bloody unbearable then it gently subsides back down to a gentle scream... So, any thoughts? Is it something that can easily be repaired..Why is it just one gear? Am i likely to strip it all down find a load of horrors that can't be fixed easily and wish I'd left it? or spend weeks lovingly rebuilding it to find it still makes a row in top......Your thoughts please....:-D Quote Link to comment Share on other sites More sharing options...
gritineye Posted February 19, 2012 Share Posted February 19, 2012 Most would say NFSGB.....:-D Quote Link to comment Share on other sites More sharing options...
Zero-Five-Two Posted February 19, 2012 Share Posted February 19, 2012 NFSGB What's that then????? Quote Link to comment Share on other sites More sharing options...
gritineye Posted February 19, 2012 Share Posted February 19, 2012 Normal for Scammell Gearbox.....:-D Quote Link to comment Share on other sites More sharing options...
Zero-Five-Two Posted February 19, 2012 Share Posted February 19, 2012 Sorry, I haven't had much experience with Scammells, not ofay with the jargon :red: Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted February 19, 2012 Author Share Posted February 19, 2012 Ahh well....I looks like it might be time to invest in some ear defenders then...:nut: Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted February 19, 2012 Share Posted February 19, 2012 Rob, the Scammell 6 speed is a law to itself, it is almost too clever for its own good. When I bought my Explorer it had 6k miles on the clock but it was difficult to engage 3rd from 4th. When I stripped it down the needle bearings had vanished from one journal and the large mainshaft gear was floating about so much it had almost machined its way through the casing and destroyed the shaft. Noise? quiet as a mouse in all gears. The replacement unused REME re-build was just like yours, howled like a banshee in top. A friend of mine is an LGV fitter with a large outfit that owned a Highwayman which howled in 6th. They tried everything, had the 'box out 5 times, new gears, new bearings, different gears and still never fully resolved the problem. Bear in mind they are straight cut gears which are prone to whine and 6th is a serious overdrive, 0.62:1. The actual specs for the 'box call for very tight tolerances, typically the diameter of a needle bearing journal is given as 1.7313/1.7308" i.e. half a thou. although whether this was achieved in production is debateable. Quote Link to comment Share on other sites More sharing options...
gritineye Posted February 20, 2012 Share Posted February 20, 2012 Good answer Mike, that just about sums it up! When I rebuilt mine with the new parts I got from you, I checked every one of the 140 new needle bearings to get matched sets, there was a surprising amount of variation in size. Given the tight tolerances required it would only take a few oversize ones scattered about the journals to cause noise problems! All that careful work and four years later my box just is starting to make the top gear whine, although it takes a well trained ear to hear it, must be just about run in then! Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted February 20, 2012 Share Posted February 20, 2012 On 13/04/2008 Gritineye wrote: 'Luckily, a couple of yrs ago I had bought the complete brand new internals from a Constructor box that had laid under a bench for around 12 yrs' Sorry Bernard, you are outside of your 5 year warrantee....:cool2: Quote Link to comment Share on other sites More sharing options...
thor698 Posted February 20, 2012 Share Posted February 20, 2012 Right then Fellow Scammell owners.......My gearbox is silent in operation in through all the gears until the top gear is selected...then the whining starts..and it's loud and as we accelerate through 23 mph its bloody unbearable then it gently subsides back down to a gentle scream... So, any thoughts? Is it something that can easily be repaired..Why is it just one gear? Am i likely to strip it all down find a load of horrors that can't be fixed easily and wish I'd left it? or spend weeks lovingly rebuilding it to find it still makes a row in top......Your thoughts please....:-D mine would sream in top but when i changed the clutch it stop. i found the rivets had worn on the clutch:D Quote Link to comment Share on other sites More sharing options...
gritineye Posted February 20, 2012 Share Posted February 20, 2012 On 13/04/2008 Gritineye wrote: 'Luckily, a couple of yrs ago I had bought the complete brand new internals from a Constructor box that had laid under a bench for around 12 yrs' Sorry Bernard, you are outside of your 5 year warrantee....:cool2: Just looked up the small print on that Mike, it says 'Warranteed for 5 yrs or 500 yards whichever comes first'! I didn't think underwriters would know Scammell gearboxes that well... Quote Link to comment Share on other sites More sharing options...
Scammell4199 Posted February 20, 2012 Share Posted February 20, 2012 We recently finished a total rebuild of our box, just hope after all the effort it works well now, gonna be a while before it gets the acid test tho. For anyone who hasn't seen it you can see the ups and downs of our rebuild at:http://hmvf.co.uk/forumvb/showthread.php?3975-Scammell-Pioneer-Restoration Richard Quote Link to comment Share on other sites More sharing options...
rbrtcrowther Posted February 20, 2012 Author Share Posted February 20, 2012 I'm pretty sure the clutch was ok when i had it out. Its the original unsprung center plate and in good nick too... It must have run for years with nothing holding the rear output flange on so who knows what funny wear patterns have occured.... Quote Link to comment Share on other sites More sharing options...
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