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reb78

GKN Overdrive Strip Down

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It's getting better with use, most likely the new clutch parts beginning to bed in, I'll check the fluid level on friday & have a good look around for any leaks, but haven't seen any telltale spots on the ground. I'm happy with it & my 110 seems a bit queiter even without OD engaged.

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checked the fluid level earlier, it was down by about 100ml, so level is restored & will see how it behaves on the drive to & from work tomorrow.

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On 5/6/2019 at 8:46 PM, reb78 said:

Just thinking. A spacer will push it closer to the exhaust. It isnt far away already, theres not a lot of room there. 

 

Will it fit triumphs and the like that use these gkn od’s?

Some fibreglass exhaust wrap around the near section of exhaust will sort that, or a heat shield like John suggested.  I know a lot o people don't like wrap because it can hold moisture and cause rust, but if the pipe section is clean of rust and given a decent coat of high temperature paint, it should be fine - I haven't had any rust appear on my down pipe in the decade it has been wrapped, possibly because of the paint layers I gave it.

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1 hour ago, Snagger said:

Some fibreglass exhaust wrap around the near section of exhaust will sort that, or a heat shield like John suggested.  I know a lot o people don't like wrap because it can hold moisture and cause rust, but if the pipe section is clean of rust and given a decent coat of high temperature paint, it should be fine - I haven't had any rust appear on my down pipe in the decade it has been wrapped, possibly because of the paint layers I gave it.

I agree - its whether it pushes it so far that it interferes though, as it will be getting pretty close. I will probably wrap mine there when I add a larger sump to my OD - although if i can put a shield on then that might be better.

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My complete exhaust system is stainless steel so putting ome wrapon it won't/shouldn't give me any issues.

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Apologies for the slight thread Hi Jack

Has anyone overcome the problem with the lack of replacement speed sensors?

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5 hours ago, Oakmaster said:

Apologies for the slight thread Hi Jack

Has anyone overcome the problem with the lack of replacement speed sensors?

Have a read of this Note the DATE & poster :)

 

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Yes! - so in 4 years we have not made any progress on that front!  Oh well!  I will try the relay and the reversing switch approach.

was your kit from Devon 4x4?

- I wonder if anyone has worked out how to make the LED  in the gear knob work to show if it is engaged?  if not I could put a bigger brighter LED on the dash.  (forgetful moi?)

Thanks Ralph.

B

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Yes my kit from Devon 4x4, the led I think can be wired into the switch, so it lights when switch is operated to engage OD, I've been thinking of doing it to my gearknob led. 

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On 5/8/2019 at 4:57 PM, western said:

It's getting better with use, most likely the new clutch parts beginning to bed in, I'll check the fluid level on friday & have a good look around for any leaks, but haven't seen any telltale spots on the ground. I'm happy with it & my 110 seems a bit queiter even without OD engaged.

Well, done a long drive to Wiltshire & back this weekend, OD was fine on the main roads/motorway doing exactly as its meant to, BUT on local roads with it disengaged & sometimes when disengaging it would not disengage cleanly & I had a few occassions of unwanted slippage & taking to long to disengage which meant loosing road speed too, fluid was topped up on before the long trip, going to get some more fluid & change  it during this week, may also drop the circular filter & clean it with brake cleaner & fresh ATF before refitting it,  if that doesn't stop the unwanted slipping, it'll be removed & stored in garage until I can afford a Roamerdrive unit.

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Just been & checked fluid level it was approx 50ml down from dribbling out the fill/level hole, but no sign of any leaks on outside of the unit.

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Tried to drive this morning to go to work, virtually no drive at all, crept out of the drive & down the road, OD slipping a lot, only gripped for about 30 secs, so turned around & came back home, very slowly into my drive. Makes 110 undriveable. 

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I would be tempted to replace the broken part in your old one with the necessary bit from the new one Ralph. The one you have has had a lot of other new parts (inc clutch) so will provide spares moving forwards for you too.

 

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About To go out & remove it all & refit the original transfer gear, only early shift this week so need it to go to/ from work, 

My previous OD is in bits in garage & needs gaskets, seals, filter changing if I decide to refit it, haven't got the it's or time to play with it until the weekend

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oh, I didnt mean to do it straight away!

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Got to have 110 on the road for tomorrow morning to go to work, 

 

Just dropped the oil it is black, a few drops on a clean rag, only done nearly 500 or so miles

IMG_20190520_171806.jpg

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Some sludge on inner face of baseplate

IMG_20190520_172245.jpg

I cleaned this & the filter with brake cleaner before fitting. Could be gummed up inside, but a strip down will have to wait until the weekend 

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That's not good for 500 miles, but then if it was slipping.... You will toast it very quickly indeed, much like an autobox without the kickdown cable connected.

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All removed now & on bench, original gear refitted & all good for going to work tomorrow. 

 

Will pull the OD filter either tomorrow evening or at the weekend. 

IMG_20190520_190134.jpg

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Sorry to see this Ralph....

After new clutch / brake material, springs, filter and spragg clutch it was behaving itself until it ran low on oil. 

As I explained before, we only discovered the oil leak once we made camp that night and it was taken out that evening. It wasn't slipping all the time.. Only on a few occasions but once we discovered the leak it was safest to remove it.... It sat un-touched in the box as you got it for two years....

I believed it to be in good order but didn't have any vehicle to fit it to...

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No worries, going to remove the big filter tomorrow if I can get the cap off & give it a good clean, actually looking inside from the bottom plate it looks quite clean, didn't have any big bits fall out when the bottom plate was removed. 

 

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If you're going onside, here's a pic of the brake / clutch material for comparison to new...1816647175_2016-07-0616_21_52.thumb.jpg.08cf52faa3096339e881a53e9de6e7f3.jpg

2028858350_2016-07-0616_22_04.thumb.jpg.0d2df754bf4ea83f03640e411fc8366f.jpg

And the obligatory pic of the new spragg clutch.. :)

420301814_2016-07-3015_10_02.thumb.jpg.634a071f3de4d1624ddcc5efff3d6ac0.jpg

And springs...

662837707_2016-08-2513_37_33.thumb.jpg.2a7d887352873d9ebee9eb0451a7b189.jpg

Might be worth checking the piston that generates the oil pressure? I'm assuming it needs oil pressure to hold the brake / clutch material into the Overdrive position to make drive go through the planetary gears? (Effectively the cone is a brake not a clutch)

Or do as Rich suggests and build one from the best parts of both?

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No problem with the parts you changed, as they old ones are in the box, going to look at the filter first, hopefully my angle grinder adjustable key will get the filter base off. 

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I was only thinking out loud while typing Ralph....

Filters, springs, brake media, spragg clutch "should" all be ok.. So the only thing that came to mind was suitable fluid pressure to force the cone to act as a brake and route the drive torque through the planetary gears.... (If my recollection is right, spragg is only really a reverse safeguard!)

Therefore if filters are clear it could point to potential wear in the pump mechanism?

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