Fairey overdrive - tight fit with handbrake - Defender Source
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  #1  
Old November 17th, 2013, 09:54 PM
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Charles Galpin
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Fairey overdrive - tight fit with handbrake

Is it normal for the overdrive top plate to press up against the handbrake cross bar? The bar still twists ok when I engage the handbrake and I don't hear any rattles, but the bar is right over the vent hole in the plate (which has a cotter pit in it) and I'm worried it's stopping it venting properly. I will probably drill and tap and add a vent line like the diffs, but am still curious if the fit is usually this tight or of my drivetrain is mounter higher than usual or something. I did loosen the handbrake mounting bolts and made sure it was mounted as high as possible.
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Old November 17th, 2013, 11:16 PM
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Charles Galpin
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Good to know, and agreed on the precision. Like I said I attempted to raise it in the existing holes already but I guess I could elongate the holes.
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Old November 18th, 2013, 12:54 AM
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So the Truck will be a 2 speed now? If you don't mind me asking, what are you doing to engage reverse? Is it like forklifts with the 3 and 4 speeds and the ability to have them in forward and reverse?
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Old November 18th, 2013, 07:52 AM
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Steve Maietta
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Yep OD works in reverse.

It was stated in the Roamerdrive paperwork (Roamer and Fairey have very similar shifting linkage ssetups) that every so often there is a truck that will have slight interference as yours does. You should be able to bend the bar up a tiny bit, to give you clearance. I wouldnt want it touching, if it doesnt rattle now, it may later. And the vent issue..
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Old November 18th, 2013, 08:09 AM
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Charles Galpin
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John this is on my stock 88". I bought this overdrive a few years ago but haven't really had any motivation to install it. I'm about to start commuting about 30 miles each way and would like to drive the series so thought I'd give it a try. I did a decent drive on sunday and like it so far although not so much on hills (but its very flat around here.

Steve, thanks for the confirmation. I'll make sure it's not rubbing for sure. I actually ran out of time and haven't hooked up the linkage yet either so have to get back in there anyway.
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Old November 18th, 2013, 08:24 AM
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If it's any help I have a fairly new Hardura tunnel cover that has the hole in it for an OD lever. I think it was on the 109 for a couple months at most.
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Old November 18th, 2013, 08:28 AM
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Charles Galpin
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Sure bring it to HH please. I have to buy or make a boot for the lever as well.
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Old November 18th, 2013, 08:30 AM
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To my recollection the lever just pokes thru the tunnel tin. The cover I have sorta acts to keep the breeze out.
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Old November 18th, 2013, 08:38 AM
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Charles Galpin
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Yeah the stock cover is a piece of rubber and a retaining ring.

http://www.rdsparts.com/fairey/image...195RTC7196.jpg

Once I see how well centered my hole turned out I'll decide if I want to make something or spend $30 for one. A rag stuffed in the hole mutes the noise pretty well so it shouldn't take much. But I do want to seal it up.
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Old November 18th, 2013, 08:42 AM
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Oh I forgot to address thew reverse question - on the e-rover it's just changing the direction the motor spins electrically. I am going to limit the torque and speed in software but in theory I could go as fast in reverse as forward

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Originally Posted by JohnsD90 View Post
So the Truck will be a 2 speed now? If you don't mind me asking, what are you doing to engage reverse? Is it like forklifts with the 3 and 4 speeds and the ability to have them in forward and reverse?
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Old November 18th, 2013, 09:32 AM
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Charles Galpin
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Yup I looked at those (printed them out in fact) and there are cleaner version out there. I have mounted the bracket and drilled the 2" hole per the instructions but it looked like there was no way in hell I could install that linkage without pulling the tunnel cover which means pulling the floors first, and was out of time. I'll look at it with fresh eyes but I don't think I'm going to be able to step 6 with the cover on place.
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Old November 18th, 2013, 04:24 PM
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A tip I found useful for aligning the hole for the lever on the tunnel is to find a bolt that fits into the shift linkage (The piece in step 4 above) find a bolt the fits the welded nut and cut the head off, grind it to a nice concentric point. then screw the bolt out until the sharp point is just missing the tunnel when the tunnel is on. when youv'e got it right there, and the tunnel is in correct position, whack the tunnel with a rubber mallet and you will have given yourself a perfectly located divot to use to guide the hole saw.

alternately, follow their dimensions but start with a smaller hole and then you can file it to the perfect spot.
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Old November 18th, 2013, 04:43 PM
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Charles Galpin
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I already cut it and my recollection was that I might have angled the initial drill a bit and so the hole did not look centered to me after I cut the 2" hole. But I could have been wrong (was in a rush at that point) and it wasn't awful, but either way as long as the lever fits without hitting I can make up for it. Especially if I make a custom cover it's not a problem. I'm going to try finish it tonight if I can make the time.
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