2009 at the Hammond Barn

[Bob Carriere]

Let me first deal with S. comments and suggestions....

I can remember if the CMP Chev Master Cyl. has a screwed adjustment.... remember doing just that on an old car some yeras back..... so you have given me something to look at..... it might also explain the dragging front axle cyl. that did not seem to release..... might explain quite a bit......

Grant to take note for this rainy Saturday....

Master Cyl cover does have a air hole and was placed on loosely just enough to prevent fluid form being squirted up from the reservoir while pumping.... but will check again with a blow gun to make sure it is vented.....

Walde...... yes we did have the truck on 4 axle stand and readjusted all four wheels to slight dragging.....using the small window slot on the brake drum allows to see the tight fit of both brake shoes.....

We may well do the whole process all over again if the rain is just preventing anyother activity......

We actually started the engine and engaged the gears to see the wheels spin.... and noticed that the differentials were working by spinning the less dragging wheel of each axle........ carefully applying the work boot tot he spinning axle usually caused the far side to start spinning.....

I am gambling on push rod adjustment for the moment.... or the overall linkage system for the brakes with all the clevis and adjustments.

BUt..... I also plan to do a full bleeding cycle on all four wheels again..... thank God Grant is very patient and very exacting in such an exercise. He calls it gaining experience for when we do his cab 13.......

Really appreciate your help...... don't be shy to comment.... like Phil said it may be the most simple thing that we have overlooked and need to be reminded.

We are learning all the way.

Boob

[Bob Carriere]

Just a quick follow up......

The typical Dodge M37 trailer... the M101a lunette is 6 1/4 inch across compared to 5 or 5 3/16 on two different CMP trailers...... the cross section of the ring/lunette is 2 1/16 for the M101a compared to 1 1/14 to 1 3/8 for the CMP trailers......

That implies that the M101a lunette is a very tight fit on a CMP pintle..... almost to the point of eliminating any typical rattling associated with pintle towing.

I have attached a hand drawn sketch of the cross section, viewed from above, of both pintles which have noticeable differences......

The CMP design is such that the lunette curve of the ring fits much tighter than the reverse open M37 style..... and they call it progress. In the CMP model any braking or decellaration would be better captured by the curved feature of the pintle....

Bob

[Bob Carriere]

A big Hammond thank you to S Latheron........ Nothing like a 3000km diagnostic......

We removed the front floor section for easier access and turned the push rod 1 1/2 turn..... re-assembled..... and voila...... good brakes....... by shortening the push rod I assume that the return hole now clears the piston cup and the pedal gets hard after an inch or so......

Drove in the back field...... brakes will easily stall the engine and does not require pumping... amazing how tight the turning radius of the C15a can be.... feel like a large Jeep.......

.....to Phil Waterman... you were right it is always the most obvious that we overlook.......

Now if only someone could give me a solution to the spot welder....

Thanks again guys..... were would we be without the MLU....

BooBee

[S LATHERON (RIP)]

3000 MILES AT 150 CDN DOLLARS or A CONTAINER LOAD OF F60 BITS

JOKING OF COURSE.!!!!

Glad that the cause of the problem has been found and rectified. I did forget to ask if there is a lock nut on the push rod!
My Landrover brakes started out ok but I had not pinched the lock nut up tight in the master Cylinder on the push rod. The rod went out of adjustment. the brake fluid got trapped in the lines after a run down some hills. Brakes locked on in city centre. LOW Four wheel drive to lurch out of traffic lane. I was in the middle of 3 lanes on an up hill section when the brakes locked up. 1 wrecked 1/2 shaft end and 20 minutes trying to get moving, Finally released brake union and let fluid out onto car park [ 30 years ago] Statue of limitations applies Guv.
Moved to safer spot and went through checking for cause at my leisure. Laid on ground under drivers floor and used hands to operate Brake pedal lever, soon saw and heard problem as the system hydrauliced in about 2 strokes of pedal, Removed clevis as you did, Wound push rod to reduce rod length, REMEMBERED TO TIGHTEN LOCK NUT and re attached clevis.The brake actuation was much more positive. I also added a second return spring to the linkage to ensure the pedal fully returned on time every time.
The half shaft was changed a week or so later as it had broken off at Hub end,
Regards Stephen

[Bob Carriere]

Hi Stephen

Takes so little to sort out some problems.

...and I should have known better..... statute of limitation applies.....

In the 70s I offered to clean up a friends driveway while he was away in FLorida for Xmas..... using an old M43 Dodge ambulance..... it would work for a while then the brakes would lock up..... with 12 inches of wet rainy snow to clean and not wanting it to turn to cement whenit froze I finished the job by repeatedly crawling underneath and releasing teh pressure from teh bleeder valves and adding more fluid.

Got the job done....soaked to the skin in icy water......and spent New Years in bed with total deafness, ear infection and sore throat......

The owner laughed at me for not re adjusting the master cylinder rod... a new Mc had just been installed before he left for vacation..... you would think I owul dhave remembered....DUH !!!!!!

There are NO lock nuts on the CMP MC but there is a lock nut near the clevis which was loose and was promptly tighened. A new return spring may be in order as I am using a 1940 original.....

Thanks again for your insight..... wish you were closer!!!

Bob C.

[RHClarke]

A man's fancy turns to ... HUPs!

The day started off somewhat gloomy, but it quickly heated up at the barn. This was the first weekend where the mosquitoes showed up in force. Grant and I figure that we knocked off at least two air wings each of the nasty little pests.

Grant worked over a set of 20 inch rims, Bob fulfiled his honeydo list and I played with the HUP in preparation for its roll out scheduled for today. A quick check of of the cooling system and some electrical trouble shooting, later, the HUP fired up. I still need to connect the vacuum lines and do some general lubrication and tightening, but the engine sounded OK. I have some excessive rattling in the head, but everything else seems to work alright.

Bob heard the HUP's purring and joined us for the event. Unfortunately, I forgot my camcorder, but Bob captured part of the event on his digital camera. The video can be seen here:

http://s143.photobucket.com/albums/r...t=HPIM8909.flv

"Whoo-hoo" sums it up for me. Grant and I then headed out to lunch at Mike's Place in Hammond. After lunch, I recruited Bob to do some gorilla welding. He was kind enough to weld my POW cans onto the arse of the HUP. I must say, the old girl is starting to look like her factory photos. Thanks to Bob for the welding and to Grant for the assist in getting the HUP on the road.


The rest of the afternoon was spent fiddling with the 20 inch rims, some general puttering around and chatting about upcoming road trips. Bob and Grant are hitting the road tomorrow for a secret rendezvous somewhere north of the city...all will be revealed.

It was a great HUP-Day at the barn. After leaving some grafitti on the barn doors, I headed back to the city for dinner and a boys night in for hockey.

[cmperry4]

Nice to see the HUP progress. I have dimensions and a basic drawing for the rear oil can racks and plan to have my brother brake the bits up for me in his shop. Remind me to bug you about specs and dimensions for the underneath tool box - Something else far down the road, but still planning to do on the thing.
Hoping to make some progress after next week, during a couple weeks of vacation, but 600 feet of log rail fence have to come first, and girlfriend is also taking vacation time, so some activities more to her liking will also have to come into the picture.