Thread: Roverdrive LT95 epicyclic O/D soon.

Originally Posted by Lotz-A-Landies

There should be some word on the LT95 Roverdrive by January along with pricing.

One is to be fitted to "Matilda" the 4BD1 Isuzu 110 (below) for promotional activities in the UK around April.



Matilda in Zimbabwe 2009

Wow - Matilda has changed a lot since I last saw it in the "flesh"
Used to look like this:


Matilda is an Australian built 4BD1 powered county which was procured by DaveS and shipped to canada, back when Dave was the Australian agent for RM products.

Is the LT95 Fairy overdrive all that bad. I think a lot of the bad press related to the series Fairy overdrive has rubbed off unfairly on the LT95 version. While the basic function of how it works is the same, the LT95 does not have the lubrication problems that caused issues in the series version.

Garry

The weak spot I have seen in the Fairey OD is the fine teeth on the cog that replaces the mainshaft transfer gear and fits inside the OD transfer gear. A friend that looks after his county very well had just taken off from the lights and the teeth gave way.
Mine when fitted in the OD gear and has a few thou play, not a worry. He had a new one and it had absolutely no play in my OD. He gave me upto 100K life left on mine so its not too bad.

If you look at a corresponding Toro gear in their overdrive it has a lot less teeth but they very chunky. Looks heap stronger.

Another thing that puzzles me is the instruction on fitting the Fairey OD it basically states try one shim or the other when fitting this gear to the mainshaft. If this was not shimmed as per EMER Q052, Page 37.20.28 para 8 the two thrust needle rollers and washers around first gear will not have the right end float. Any amount above the 2 thou max required would also allow the whole mainshaft too potentially float back and forwards that amount on the rear mainshaft bearing.

Peter

Hi Peter

what i suspect and please correct me if i am wrong that 2 thou could be to do with the shim in the main gear box output sharft(back of gearbox).If the sharft is allowed to move towards the front of the gearbox you are in allsorts of trouble (believe me) been there done that

This 2 thou gives a preload same as the normal gear for the dog gear

hope this makes sense

Maurice

Originally Posted by PeterP

Another thing that puzzles me is the instruction on fitting the Fairey OD it basically states try one shim or the other when fitting this gear to the mainshaft. If this was not shimmed as per EMER Q052, Page 37.20.28 para 8 the two thrust needle rollers and washers around first gear will not have the right end float. Any amount above the 2 thou max required would also allow the whole mainshaft too potentially float back and forwards that amount on the rear mainshaft bearing.

Peter

Maurice,

Exactly what I was trying to say.

Where your ears burning????

Peter

Originally Posted by garrycol

Is the LT95 Fairy overdrive all that bad. I think a lot of the bad press related to the series Fairy overdrive has rubbed off unfairly on the LT95 version. While the basic function of how it works is the same, the LT95 does not have the lubrication problems that caused issues in the series version.

Garry

Garry

I had a Fairey O/D on my 2 door classic with standard 3.5 carby V8 and the OD only lasted until it was just out of warranty. It was so new that I didn't believe that it was the OD that failed and had the car flat towed 160KM for gearbox repairs.

It seems that the later Fairey O/D (like the one in Ron 101's) have an oil recycling device, something that mine didn't have.

Diana - so I take it that not all LT95 Fairy's are the same - mine has the oil catchers cast into the casting so the oil goes in from the tfr case into the O/D (about a litre capacity) with the excess flowing back to the tfr.

In theory the O/D should always be full even if the tfr is getting low (at least while the tfr is throwing up oil).

Garry

Originally Posted by garrycol

Diana - so I take it that not all LT95 Fairy's are the same - mine has the oil catchers cast into the casting so the oil goes in from the tfr case into the O/D (about a litre capacity) with the excess flowing back to the tfr.

In theory the O/D should always be full even if the tfr is getting low (at least while the tfr is throwing up oil).

Garry

Yes Garry

That is correct, the early LT95 ones, like the one on my 2 door in 1982 and I think the Series Faireys still don't have the oil recirculation. Not sure who designed the window and Archemedes screw type first however it has always been an aspect of the Rocky Mountain Roverdrive. It was also something a number of enthusiasts did mechanically with a funnel and tube retrofit.