New Game CMP Brain Teaser Trivia

[Grant Bowker]

Originally Posted by Tony Wheeler

In what way do chassis siderails produced for Australia differ from all others?

Is the precise wording a clue? In other words, is there a difference in rails made in Canada for Australian use compared to those for Canadian or British use? Is the difference you are seeking common to Ford and Chev?

[Phil Waterman]

Hi Guys

Richard, got it first and Tony got it second. You win less gear lube dribbling down your arm the next time you have to add lube to your Chevy transmission.

Picture of Spare Transmission
Transmission 002.jpg
Transmission in Neutral
Neutral Trans 005.jpg Neutral Trans 006.jpg Neutral Trans 008.jpg
Transmission in 3rd gear (the spacing is the same for all forward gears)
3rd Gear Trans 019.jpg

See the next post for the difference with transmission in Reverse.

[Phil Waterman]

Hi Guys

Now for the difference in Reverse

Reverse Trans 012.jpg Reverse Trans 014.jpg Reverse Trans 013.jpg

As you can see in the middle picture above there is about an inch more clearance in side the box with transmission in reverse.

As the plug is located in a position almost impossible to actually look in on the truck, I remove the plug an insert a finger (clean of course) and crock the first joint to check the level.

Now for curiosity here is the top cover with all the forks set for Neutral I have a copy of this picture and one looking down into the transmission with all the gears in the neutral position as reference in the shop.

HUP Neutal Top Trans.jpg

The last picture is transmission tick tac toe for where are the different forks positioned for what gear.

Shift Fork Possition1.jpg

Note of explanation: The reason for all the grease on the gears, this is my spare transmission that have repaired after breaking a tooth. As this one is in storage want to really protect it from rust so I coated everything inside in a heavy layer of grease. Then sealed all the opening as much as possible.

Story of breaking the tooth http://www.mapleleafup.net/forums/sh...ighlight=tooth


Now for you Ford guys is there one gear better than another for checking the lube?

To sum up

What gear should you put a Chevy CMP to check the lube level in the transmission?

Answer

Reverse as this moves the gear closest to the lube fill plug away by an inch. Allowing for easier checking and easier adding of lube if needed.

Side point don't over fill it just makes them leak more.

Cheers Phil

[Richard Farrant]

Well Phil,
I know the box is virtually identical to that used on the WW2 Bedford trucks, but had forgotten how Chev put the level plug at the back. The British arm of GM had the level plug in the side so none of these dramas.

Bedford also redesigned the Chev 216 into the Bedford 28hp, which had full pressure lubrication to mains and big ends along with replaceable shell bearings ...... oh and no fibre cam gear either. All this before the first Chev CMP's went into production too!

[Tony Wheeler]

Originally Posted by Phil Waterman

Now for you Ford guys is there one gear better than another for checking the lube?

No such issues Phil, the filler plug is on the side of the box, well clear of the gears. It's also angled downwards about 45 degrees, so your finger could reach down further to check the level. All very considerate of Ford, unlike the dizzy!

Interesting to compare the two gearboxes, I've never looked inside a Chev box. The Ford one seen here is in 3rd gear. Reverse idler and selector fork can be seen top left. It's on a half length shaft, unlike the full length Chev one. As you can see Phil I couldn't quite match your maintenance standards!

TONY6313 - Copy - Copy.jpg

[Mike Cecil]

Keith,

You are being mischievous! Fancy dropping such an 'isolated' question on the poor overseas CMP-ers!

Common guys, I'm out of the running, but Grant's answer A is getting close to the money. More info needed: look at some pictures of Aussie trucks (sorry, Lorries)

I could ask a question or two of CMP owners in Australia: what's the difference between the lower back of Canadian Ford Cab 13 and the one found on Ford CMPs assembled in Australia, and why?

And while on the subject of cab backs, what's the difference in the fastenings of the roof to cab back on Ford Australia assembled cabs, than those assembled by Ford in Canada??? (and why??)

Keith already knows, so he's out already.....

Mike C

[Lynn Eades]

Just for the record, many parts in that Ford box are interchangeable with the Dodge 4 speed built under the "New Process" brand.

[Tony Wheeler]

Yes I often check ebay USA for that reason Lynn. I'd like to build a complete NOS gearbox if possible, just to see how quiet/noisy they were brand new. Expensive exercise though.

I was very disappointed to find this gearbox full of rust as it's an extremely low mileage blitz.

[Mike Cecil]

Keith,

No, not unfair at all: it made me smile when I read it, as was a good question.

Your supplementary - another good one- will require some thinking on the part of our overseas friends.

Mike C

[Tony Wheeler]

Originally Posted by Grant Bowker

In other words, is there a difference in rails made in Canada for Australian use compared to those for Canadian or British use? Is the difference you are seeking common to Ford and Chev?

Yes to both questions Grant. It's a tough question if you're not familiar with Australian CMPs. Even then it's pretty tough!

[Richard Farrant]

Originally Posted by Tony Wheeler

Yes to both questions Grant. It's a tough question if you're not familiar with Australian CMPs. Even then it's pretty tough!

Hi Tony,
Would this difference also involve those CMP's sent to India as well? I am aware the Indian ones had heavier steering boxes so maybe the chassis was heavier / thicker?

Richard

[Tony Wheeler]

Originally Posted by Richard Farrant

Would this difference also involve those CMP's sent to India as well? I am aware the Indian ones had heavier steering boxes so maybe the chassis was heavier / thicker?

Sorry Richard, I missed your query earlier. No, it's not related to the steering box. Hint: try the other end of the chassis!

You raise an interesting question though. CMP chassis deliveries to India and Australia differed from Canadian production, in that neither country received the heavy duty axles and steering box until much later in the war. I've never really understood why this should be so. Presumably they were prioritized for Canadian production initially, but that doesn't explain why it took years to switch production from light duty components to heavy duty components. It seems to me there must be some other reason for persisting with light duty components for these particular exports, but I can't imagine what it could be. Does anyone else have any clues...?

As far as the siderails are concerned - to the best of my knowledge there's no difference between siderails on early production chassis (ie. light duty components) and late production chassis (ie. heavy duty components). I believe the heavy duty Chev steering box is directly interchangeable, and the steering box on Fords is upgradeable by changing the RHF spring hanger, which is designed to be interchangeable without drilling new holes. The only other change made was to the F60S/L chassis, which was strengthened in the midsection. That is, externally fitted reinforcement plates, and extension of the inner skin rearwards by approx 2 feet. None of this additional reinforcement was done on the Chev chassis as the siderails are much beefier than Fords.

[Phil Waterman]

Hi All

I'd noted the rectangle vs trapezoid vents, and always wonder what civilian application they were drawn from. We probably should not be locked to the source being Ford or Chevy given the mix and match approach to the sources of other CMP parts.

Either type requires a fair amount of stamping and fabrication. So who can find the civilian version on a `30s vehicle.

Cheers Phil

[Keith Webb]

Originally Posted by Phil Waterman

Hi All

I'd noted the rectangle vs trapezoid vents, and always wonder what civilian application they were drawn from. We probably should not be locked to the source being Ford or Chevy given the mix and match approach to the sources of other CMP parts.

Either type requires a fair amount of stamping and fabrication. So who can find the civilian version on a `30s vehicle.

Cheers Phil

Yes
The rectangular vent was used on Holden built trucks, (cars too?) so it was a standard die design for the vents.

Anyone care to have a stab at the supplementary one about percentages?