How To: Ford CMP "Blitz" miscellany

[Jacques Reed]

Originally Posted by Lynn Eades

Any part numbers on your cable?

Hi Lynn,

Just has a good look. No part numbers on the cable. As Mike said, Ford assembled many other vehicles during the war so it could be for anything. Wonder how standard the fittings at xfer cases and transmissions were between manufacturers? We know it fits Fords but are others the same?

I am of the belief now just to us it as is and route it with large radiii through the chassis and clip it to keep it off wires etc. It was obviously designed to work at that length on some vehicle so no need to shorten it to make it work any better.

Yes, Keith, it was a great place, an "Aladdin's Cave" back in the 90's. I made three-monthly pilgrimages there between times at sea for many years. It closed over 15 years ago. I got NOS transmission gears, spring pins and bushings, crankcase breather filter, head gaskets, and front shock absorbers, just to name a few. He had a bin of rear spring pins still wrapped in grease paper and when he needed some round stock to turn up he would use them. Enough to make this grown man cry! Luckily I got some when the bin was still half full.

Cheers,

[Jacques Reed]

Good Day,

While working on sorting out my speedo cable I had an idea that perhaps a Ford commercial truck speedometer driven gear might work in the single speed transfer case despite the Parts Manual identifying it as unique to CMP's.

I had recently sold an F-15 transmission and took photos of the speedometer gear used at the back of the transmission for the buyer. See first photo. If I could use a similar commercial gear then the drive cable end at the transfer case would be a simple formed square in the cable instead of a keyhole fitting which would make shortening the cable simpler.

The F-15 uses a 20 tooth driven gear but I could find no info on the number of teeth on a F-15A. So I removed the gear sleeve and driven gear to see what it looked like. See second photo. Surprisingly it is only a 15 tooth gear so it sure is unique to CMP's! Most Ford commercial truck speedometer gears are 18, 19, or 20 tooth. The F-15A gear is very different in other aspects also.
I then wondered why the big discrepancy in the number of teeth as an F-15 has a 6.66:1 diff and the F-15A a 6.50:1 diff. Very similar ratios and both use 16" wheels. Probably caused by the difference of number of teeth on the speedometer drive gear in the two vehicle types but I didn't have the number for a F-15.

I found a good device to determine number of teeth required for a speedometer gear on the Summit Racing website.
Inputting 4 teeth for drive gear- known from Parts Manual.
6.27 for diff ratio- (27/28 x 6.50 to allow for 27 teeth on driven gears in transfer case and 28 teeth on the idler where the speedometer gears are).
34"- for the tyre diameter as measured.

And Bingo 14.86 teeth!

Hope this is of some interest.

Cheers

[Ganmain Tony]

Fantastic information Jacques.

I must say I have never gone to this much trouble to document this information and I am finding it very useful.

Have you looked into Oil filters for the original system on an F15/F15A? I'm keen to learn what you may already know.

[Jacques Reed]

Hi Tony,

I have attached a link to a post I made in 2017 on Lynx42 thread.
Think all is still relevant especially for procuring parts in Australia.

Couple extra points: They are bypass and not full flow filters.
I have heard of people drilling out the orifice in the input side of the filter cannister in some misguided belief of better oil flow. A real no, no, as that restriction allows the oil pressure to build up to the designed amount. Drill it out and the pressure drops in the system.

Thanks Tony I document everything for whoever has the truck after me and to hopefully assist others now.

Cheers,

http://www.mapleleafup.net/forums/sh...7&postcount=17

[Mike Cecil]

Instruction sheet that came with a Ford oil filter set. I remember the bracket shown did not suit a CMP, but there was a pressed steel bracket that mounted on two of the top line of engine head bolts that did fit. When I installed the oil filter on my CMP, I used an outlet connection into the side of the sump, rather than into the oil filler/engine breather.

The block I used had a tapped hole with a plug in it below the oil pressure gauge boss. If a block doesn't have that (and many don't), it would be easier to install a 'T' below the oil pressure gauge than to drill and tap a hole into the gallery.

Mike

[Lynn Eades]

Mike, I would have assumed that all Ford flathead v8s had a plug there because the plug blanks off the cross drilling to the main gallery.

[Jacques Reed]

Hi Tony,

As Mike described here are the lines to and from the Oil Conditioner. My two C69A blocks both have the two holes in the block for the oil line and the sending unit.
Both have the sump with the side entry point elbow for the return oil line so I would say they were definitely truck engines either civilian or military.

Both oil lines are just good old 1/4" Bundy tube. I have a set of hoses used by Canadian and British Arm units, C11Q 18669 A and B. Rechecking my Parts List it says they were used on the earlier vehicles. They obviously switched to tubing for the Cab 13's. I acquired them here in Australia but also due to their age I used tubing instead. Very interesting fittings on the ends of them.

Cheers,

[Ganmain Tony]

Mike and Jacques,

Many many thanks - invaluable information for anyone rebuilding a V8.

Jacques there appears to be a third oil line??? Or is that my imagination??

At the bottom of the filter? Are you able to take some more pictures for me please?