Roverdrive LT95 epicyclic O/D soon.

**muddy** · 21st December 2009, 10:59 PM

Originally Posted by Lotz-A-Landies

I hope you are not suggesting that all the Fairey Overdrives had the window and Archimedes screw device?

Because if you are and I can get this camera to talk to this dud computer I'll show you a pic of a Fairey O/D from a SIII without the window right now ( just went out to the shed and took a pic). If you can wait until the weekend I'll also show you a pic of one from a LT95 Fairey without the window and Archimedes screw.

HI Diana

did you get the pic yet Also the dog gear

Back up in the sunshine state

**Lotz-A-Landies** · 22nd December 2009, 03:31 PM

Sorry Muddy

I didn't take the camera to the farm and thought that bit of the thread ended with my being corrected for assuming without basis.

Will take the camera on the WE and may even take the laptop to do it down there.

Diana

**muddy** · 22nd December 2009, 11:53 PM

Thanks Diana

very interested in this early version used on the lt95

**Lotz-A-Landies** · 30th December 2009, 06:23 PM

Originally Posted by muddy

HI Diana

did you get the pic yet Also the dog gear

Back up in the sunshine state

As requested!

Sorry for the delay, the unit has been in an open sided farm shed since the early 1980's hence the look of the output gear.

Diana

(Do you really need the dog gear? I don't think I still have that, it is fine splined.)

**muddy** · 31st December 2009, 09:16 PM

Hi Diana

Thanks for the pic it is the same as I have (fairy and torro shape) as garrycol (no 26 post )said it works on excess oil goes from O/D into T/C when filling and the reverse when running the gear will splash the oil onto the overflow gutters (cant think of a better name) and cause equalibrum in oil levels

The failures I have had are dog gear and input sharft on fairys and torro being wear of main gear syncros. Each one would have had at least 200k use ( regular level checks are necessary )

Did you work out what caused your failure?

Maurice

**123rover50** · 1st January 2010, 05:35 AM

All mine just have the gutters. Anyone got a photo of the one with window and screw?

Didiman

**101 Ron** · 1st January 2010, 01:25 PM

**Lotz-A-Landies** · 1st January 2010, 06:19 PM

Originally Posted by 123rover50

All mine just have the gutters. Anyone got a photo of the one with window and screw?
Didiman

Am assuming you are talking about the protrusions either side of the nose of the casing. Are they gutters or reinforcing webs? What ever they are I can not see how they are feeding oil to the O/D unit.

**clean32** · 2nd January 2010, 10:33 AM

like his question ^^^^^

but all this is a bit past me, but then as theres a few pics of overdrive units i wonder if any are going begging?

**101RRS** · 2nd January 2010, 04:55 PM

Originally Posted by Lotz-A-Landies

Am assuming you are talking about the protrusions either side of the nose of the casing. Are they gutters or reinforcing webs? What ever they are I can not see how they are feeding oil to the O/D unit.

The little wings (gutters) are slightly higher at the tfr case end and they are slightly curved in cross section so forming a scoop on either side of the input shaft. At the end of each scoop there is a hole in the housing a little under 1/2" in diameter that allows oil into the o/d and also allows oil to flow back out into the tfr case when the O/D sump is full.

So the O/d is full of oil and as the tfr case gears turn they splash oil some of which is captured by the scoops and feed into the O/D - the oil is constantly going in and out of the O/D. This process should still be working even if the tfr case oil gets low as long as there is splash. Even if the tfr case got too low in oil to splash, as the o/d has its own sump it should still work but the oil would slowly be exhausted to the tfr and ultimately both would fail - but in theory the tfr case should go before O/d - but reality may be different.

Because of this oil transfer process between the two - to top up the tfr case, you remove the tfr case filler plug and the O/D filler plug - you fill through the O/d filler and wait until the oil comes out the tfr case filler hole - both are then topped up. Because of the small holes at the end of the O/d gutters it takes some time for the oil to flow through - hence I believe the window in Ron's pic allows the oil to flow more quickly from the top of the O/d sump inot the tfr case.

Garry

Thread: Roverdrive LT95 epicyclic O/D soon.

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