Sprint Overdrive Gearbox

[spanishdolly]

Hi there pals¡¡¡ I need a good gearbox with overdrive for my dolly, no matter if 2nd hand in good nick, I was thinking of take a look inside, nothing urgent but, loose a little oil, gears have a bit hard action and overdrive on 3rd gear do strange things... I will topping up oil tomorrow, by the way 20/ 50W is ok? and see if all goes well by the moment.
So not with rush but seeing the prices of complete overdrive gearboxes trough ebay.uk it is not crazy movement to pick it up one just in case...

Someone have one of this to spare? something I can trust it, mine works, if not perfect... not so far away, I done 1100 kms the last weekend with no problems, only a lighty oil leak trough the rocker cover...as ever, Sprint trademark...


I have to put pics of my sprint with its brand new spanish plates, washed and polished, new door window channels and more... really a black beauty.

Best regards from Madrid, Raul.

[Jon Tilson]

Top up your oil. Look at the o/d seal where the prop shaft joins on. This can be changed in place.
Then I;d grease the bottom of the gearstick. This works wonders.

o/d erratic is possiby the inhibitor switch. You could clean out the fioter as well. You need EP 80 for the box, not 20-50
Actually the reccomended oil is 75W but thats hard to get. I get castrol manual 80W for mine.

Jonners

[spanishdolly]

Top up your oil. Look at the o/d seal where the prop shaft joins on. This can be changed in place.
Then I;d grease the bottom of the gearstick. This works wonders.

o/d erratic is possiby the inhibitor switch. You could clean out the fioter as well. You need EP 80 for the box, not 20-50
Actually the reccomended oil is 75W but thats hard to get. I get castrol manual 80W for mine.

Jonners

Thanks Jon I will do as you tell me, curious that same Laycock de Normanville overdrive works with different oils, my humbers sceptres and sunbeam alpine always works with 20/50W oil.
Regards, Raul.

[Carl]

EP75 or 80 for drain and re-fill, EP90 for topping up, all GL4 if I recall correctly.

[jeroensprint]

Hello, take care it is a gl4 you are going to use. A gl5 is for diffs and modern gearboxes. The gl5 is too good for the triumph gearboxes. When you use a gl5 the synchromesh cant' cut the strong oilfilm of the gl5. Your gears can't be synchone speed and that causes lot's of wear. Some gl4 have sulfide in it. Watch out not to use these. The sulfide reacts with the bronze synchro rings and the layshaft trustwashers. These will corrode almost to black. When overhauling a gearbox with black synchro's and washers you did use the wrong oil.

Sometimes people are not sure if there is sulfide in the gl4 and then they use 20w50. This is not the best option but when you are not sure of your gl4 it is better to use 20w50.

Almost all the mineral gl4 gearboxoils of the known populair brands don't have sulfide and can be used. The semi synthetic and full synthetic have most of the time sulfide.

Jeroen

[spanishdolly]

Whhhoaaaa.... impressed with all the knowlegde on the people around here, I will follow all the advises...

Thanks a lot for the helping tips.
Regards, Raul.

[xvivalve]

only a lighty oil leak trough the rocker cover...as ever, Sprint trademark...

You need a set of cap headed screws to replace the originals, this allows an allen key to be used to tighten incrementally including most importantly that bottom right hand one to prevent oil leakage onto the down pipe. I have a few sets by me here.

Postage inclusive price for a set of six to Portugal would be a crisp €5.00 note...

[spanishdolly]

only a lighty oil leak trough the rocker cover...as ever, Sprint trademark...

You need a set of cap headed screws to replace the originals, this allows an allen key to be used to tighten incrementally including most importantly that bottom right hand one to prevent oil leakage onto the down pipe. I have a few sets by me here.

Yeah but i have two problems:

I live inMadrid, Spain, not Portugal....just joking... and somebody in the past convert the screws of rocker cover to metric so i have to find new ones of the correct size with allen shape in metric.
Thanks for your offer anyway

[spanishdolly]

Hi again... the problem is solved, toping up oil on the gearbox and runs like new, and greasing the gearchange handle bearing with lithium grease efectively do wonders, it sound to me like it is the first time that the gearbox have been reload with oil because it don´t leak but I put nearly 1 litre of ep90 in it.

Thanks to all for help and comments...
Bets regards, Raul.