Mine is very noisy jumpy and clunky. I am replacing the diff as I know this is part of my problem. However with the tranny tunnel out and the prop disconnected I can hear a lot of chatter from 1st and reverse.
Oil level is fine. Its possible after the chassis rail was welded and the interior was put back in and it was reversed out of the welders yard it might have had the overdrive engaged. As at the time it was thought the handbrake had seized as it didnt want to move and when it did it made a fair clunk.
Is damage to first and reverse the likely outcome from incorrect engagement of overdrive.
The overdrive unit itself seems to still be in good order.
I have placed an ad for a replacement gearbox in the wanted section just in case.
The gearbox is a late single rail type
1850 transmission
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xvivalve
- TDC West Mids Area Organiser
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Re: 1850 transmission
If the overdrive is still working then it wasn't engaged when reversed; the damage would be to the overdrive, not the gearbox.
Reverse will be noisier as it is a straight cut gear. All gears will be noisier with the tunnel out, first possibly more so due to its low ratio.
It is more likely the brakes or clutch had seized as there would be little reason for the overdrive to spontaneously engage.
Susie replaced the overdrive unit on that 'box (herself, from inside the car!) and at the time there was nothing wrong with the 'box itself; are you sure you're not just being paranoid?
Why are you replacing the diff?
Reverse will be noisier as it is a straight cut gear. All gears will be noisier with the tunnel out, first possibly more so due to its low ratio.
It is more likely the brakes or clutch had seized as there would be little reason for the overdrive to spontaneously engage.
Susie replaced the overdrive unit on that 'box (herself, from inside the car!) and at the time there was nothing wrong with the 'box itself; are you sure you're not just being paranoid?
Why are you replacing the diff?
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Jon Tilson
- Guest contributor
- Posts: 11179
- Joined: Tue Oct 03, 2006 9:45 pm
- Location: Middlesex
Re: 1850 transmission
Dolomites do NOT like being bump started in reverse or 1st. I have a few broken layshafts
here to demonstrate that.
I have a new reconned 1850 box here but its not cheap sadly as the bits cost an arm and a leg....
You would need to reuse some of yours....selector bell housing and o/d unit as its just a bare box.
PM me if you want a price.
Jonners
here to demonstrate that.
I have a new reconned 1850 box here but its not cheap sadly as the bits cost an arm and a leg....
You would need to reuse some of yours....selector bell housing and o/d unit as its just a bare box.
PM me if you want a price.
Jonners
Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.
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Maidstonerob
Re: 1850 transmission
Hi Alun.xvivalve wrote:If the overdrive is still working then it wasn't engaged when reversed; the damage would be to the overdrive, not the gearbox.
Reverse will be noisier as it is a straight cut gear. All gears will be noisier with the tunnel out, first possibly more so due to its low ratio.
It is more likely the brakes or clutch had seized as there would be little reason for the overdrive to spontaneously engage.
Susie replaced the overdrive unit on that 'box (herself, from inside the car!) and at the time there was nothing wrong with the 'box itself; are you sure you're not just being paranoid?
Why are you replacing the diff?
The drive train has had considerable vibration and noise through it particularly at the rear axle. I have it up on axle stands and the axle skips around more than i would expect.
As the later model the diff it should have the .collapsible spacer and when i changed the pinion oil seal the drive flange nut was so tight I had to use a big breaker bar and a lot of welly to free it. So i think someone before might have tried to tighten it to cure the leak. As it was I stupidly used permanent marker to mark the nut and flange which washed off with the oil so I had to guesstimate where to tighten it up to and I aired on the side of caution and left it slightly looser than it was. I think the spacer and therefore the preloading is messed up. I of course in desperation tried to tighten it back up to around the same tightness it was before which has made sure it is now dead.
The off side wheel was not turning free either it seemed to stick for a 3rd of the rotation.
Had the tunnel off as well due to the masses of oil all over the gearbox dripping of the overdrive sump and bell housing to identify source of leak.
Now think the leak is the crankshaft oil seal. The oil thats leaking isnt smelly like gear oil usually is although that oil has been replaced.
I thought while the tunnel was out i should run it with the prop of to see where the oil is coming from and to check if the transmission was smoother and quieter with the prop disconnected. Thats when I heard the noise in 1st and reverse gears which i thought was excessive but obviously I dont know what it should sound like.
There is a very slight noise in neutral and quiet and smooth in 2nd 3rd and 4th.
Also found coolant seeping very slowly on the line of the head gasket next to the dizzy and heater hose above the gearbox bell housing. That i think I will fix with K seal
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Maidstonerob
Re: 1850 transmission
I have sent you a pm.Jon Tilson wrote:Dolomites do NOT like being bump started in reverse or 1st. I have a few broken layshafts
here to demonstrate that.
I have a new reconned 1850 box here but its not cheap sadly as the bits cost an arm and a leg....
You would need to reuse some of yours....selector bell housing and o/d unit as its just a bare box.
PM me if you want a price.
Jonners
She wasnt bumpstarted on this occasion but driven so thanks for the heads up on bumping mind you its always been easier to bump a car in second anyway 1st sounds like hard work.
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Jon Tilson
- Guest contributor
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- Joined: Tue Oct 03, 2006 9:45 pm
- Location: Middlesex
Re: 1850 transmission
You should always use top gear...
The point load on intermediate gear teeth is always risky.
I would have a look at the rear prop u/j but it does sound like you have diff issues.
If your box is only slightly noisy clutch up over down then the layshaft bearings sound ok.
Some noise in 1st and second is normal. They do a sort of turbo whine a bit in 2nd especially.
If its quiet in 3rd and top it sounds okay. Sadly box will need to come off to sort the crank oil seal leak.
Try and get a payen NOS seal if you can. There is an ex pat in cyprus who has a few left and posts them on ebay
once in a while.
Jonners
The point load on intermediate gear teeth is always risky.
I would have a look at the rear prop u/j but it does sound like you have diff issues.
If your box is only slightly noisy clutch up over down then the layshaft bearings sound ok.
Some noise in 1st and second is normal. They do a sort of turbo whine a bit in 2nd especially.
If its quiet in 3rd and top it sounds okay. Sadly box will need to come off to sort the crank oil seal leak.
Try and get a payen NOS seal if you can. There is an ex pat in cyprus who has a few left and posts them on ebay
once in a while.
Jonners
Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.
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Maidstonerob
Re: 1850 transmission
Thanks JonJon Tilson wrote:You should always use top gear...
The point load on intermediate gear teeth is always risky.
I would have a look at the rear prop u/j but it does sound like you have diff issues.
If your box is only slightly noisy clutch up over down then the layshaft bearings sound ok.
Some noise in 1st and second is normal. They do a sort of turbo whine a bit in 2nd especially.
If its quiet in 3rd and top it sounds okay. Sadly box will need to come off to sort the crank oil seal leak.
Try and get a payen NOS seal if you can. There is an ex pat in cyprus who has a few left and posts them on ebay
once in a while.
Jonners
Will look out for one of those seals be worth doing the clutch while I am at it as well then hopefully it wont need to come off again.
Wont get chance to get the box off until end of April I suspect now. Its quiet only a slight noise in neutral but sounds like a bolt is rattling around in first but not massively loud.