Canadian Lynx Armored Car

[Andrew Rowe]

Today we jump to the Lynx speedo. I was looking at a post that Harry Moon was saying that he was going to look into his speedo situation, so thought I might put up a few technical bits of information with regards to the speedo.
Mk1 and Mk2 Lynx run the same speedo face. The drive gear originates from the transfer case and is cut on an opposite handed direction compared to the standard F15 single speed transfer case one. This is shown in the photo, the R/H one is standard F15 and L/H one is Lynx. As far as I can tell Mk1 and Mk2 use the same gear cut. The reason for this would be that the engine is mounted in the rear of the vehicle, so turning the transfer case in the opposite direction as opposed to the standard CMP truck with engine up front. The driven gear is a 15 tooth with part number 205052 , but is referenced as C19SR-17271 part number. The Mk2 Lynx uses a 16 tooth gear with part number 205039 , and is referenced by C29SR - 17271. The different gear ratio's come about because the MK1 uses a 5.83 differential ratio and the Mk2 uses a 6.66 ratio. Tire sizes on both model of Lynx' are the same, originally
9.20 x 16 , but today we just use the standard 9.00 x 16 , although I am thinking of using some NOS 1942 Dated 10.50 x 16 on my Mk2 , as the tires are in perfect condition, and they are runflats also. Cheers from The Tank Factory.

[Harry Moon]

while my ideal solution would be getting that lynx gear, (the original seems long lost before i got it), so my backup plan is to squeeze in a reverser at the transfer case because i discovered running the speedo cable backwards and reversing the rotation at the speedometer resulted in a cable failure within miles. but it's tight in there and the one i just happened to have is to big. haven't worried to much about it so far. but i will gitter done at some point.

[Andrew Rowe]

Hi Harry, I am calling into a very clever local machinist this week, so might see if he can make a couple of these gears. This guy has made complete engines for WW1 aircraft from scratch , which includes making crankshafts from very expensive billets of special steel! Cheers Andrew.

[Andrew Rowe]

I was just playing around with a couple of these electrical components today.
At the top of the picture is a nice NOS master battery switch , made by Bepco Canada Ltd. , then we have the voltage divider that mounts on the inside of the engine compartment against the firewall, this splits 12volt to six volt for the gauges. The Lynx uses 2 x 6 volt batteries to make the 12volts. The last item is the Autolite regulator , model number VRH 4106B , this is 12 volt @ 50amps rated, Cheers from The Tank Factory.

[Harry Moon]

Originally Posted by Andrew Rowe

Hi Harry, I am calling into a very clever local machinist this week, so might see if he can make a couple of these gears. This guy has made complete engines for WW1 aircraft from scratch , which includes making crankshafts from very expensive billets of special steel! Cheers Andrew.

I'm in if it happens.

[Andrew Rowe]

Just updated post 13 , as we have discovered the gear cut angle goes to the right, and an F15 gear cut is opposite to this , so this rotational change must still be happening because of the rear mounted engine in the Lynx and CMP mounted ones at the front of the vehicle. One on the Left is correct for Lynx. Cheers Andrew

[Lynn Eades]

So Andrew, The driven gears in your photos appear to be the same? Does the Lynx output casting cater for this (sits at an angle?) to allow use of the same gear or is the correct driven gear not shown? Just asking.

[Andrew Rowe]

The two driven gears are MK 1 and MK 2 , being 15 teeth and 16 teeth. The cast casing cap sits at an angle, that takes these gears, and looking at the transfer case side where the speedo output shaft comes out, it sits roughly at a 45 degree angle and is on the right hand as you look at it. The speedo shaft ends up rotating anti-clockwise, which in turns makes the speedo dial face run the correct way, Cheers Andrew.