Info needed: F60S LAAT Wheel Cylinder size

[Tony Smith]

This issue arises often.

In this thread (HERE), Harry Moon confirms that the 6" fronts use a wheel cylinder that is the same dimensions as the large 1 1/12" rear, but only have a bore of 1 3/8". This "Special" cylinder (C118Q 2192) does not seem to be currently re-produced. All that are available are are the small front 1 3/8" cyl (Modern No W4571) for the 5" hub, and the large rear 1 1/2" cyl (Modern No W4511) used on all rear brakes.

You might consider using a W4511 rear on the front brakes, but you need a 1 3/8" cyl in the front to stop the front bakes locking up, however the W4571 although hydraulically correct size, is dimensionally too small for the width of the brake shoes. I think the bolting mount centres are also different too.

You need to start with the rear W4511, which is the correct size casting, but have it sleeved down to 1 3/8" bore. This reduction in bore size is probably beyond the size sleeve used by regular brake sleeving companies who do this work in brass or stainless steel. You might need to have the sleeving done in two steps, a coarse bushing to get closer to 1 3/8", then a a fine sleeve in brass or stainless to be the hydraulic finished bore. Assemble the cylinder with the 1 3/8" cups, pistons and spring from a W4571 rebuild kit (WK103), and the outer boots from the W4511.

[Grant Bowker]

Originally Posted by Tony Smith

This "Special" cylinder (C118Q 2192) does not seem to be currently re-produced. All that are available are are the small front 1 3/8" cyl (Modern No W4571) for the 5" hub, and the large rear 1 1/2" cyl (Modern No W4511) used on all rear brakes.

Interestingly, the C118Q2192 is not listed * (unique to CMP) in the parts book so it should have been an "off the shelf" commercial part. On the other hand, the C in the part number indicates Canadian, so there is probably no perceived market for reproductions (or not enough to justify starting to produce).
Google didn't give much help on the character string C118Q2192 (also tried with blank and dash after the Q), does anyone have any cross reference listing what vehicle(s)the part might have originally been used for?

[rob love]

Originally Posted by Grant Bowker

does anyone have any cross reference listing what vehicle(s)the part might have originally been used for?

I have the Chassis parts catalogue for Canadian Built passenger and truck models, 1941-1947. It does not list the C118Q2192 wheel cylinder at all.



I think I have a low cost solution at work....I'll have a look Monday and report. It does not involve anything as involved as sleeving.

[Mark Towers]

Gentlemen,

Thank you all very much for all your feedback and advice .... it clears things up considerably

Rob I look forward your update regarding a low cost solution

One has to try and keep ones marriage happy lol.

Kind regards

Mark

[rob love]

OK, so I remembered today to check this out. I know in the past I have used MLVW (M35CDN) wheel cylinders by changing the pucks in the cylinder, so today I compared those cylinders with the CMP cylinders I have in stock here at work. The bolt holes and line fitting are the same as the 1-1/2 wheel cylinder but they are 1-3/8 in diameter. They also seem to have the same center (from the backing plate) as the 1-1/2 inch cylinder.

I checked the old American NSN for the wheel cylinders and came up with a part number of WC4419. I checked NAPA and they list them under part number 4419 at $40 trade price. Or you can simply look up M35A2 wheel cylinders on ebay....lots of them available.

You will have to move your pucks across from the old wheel cylinders, as the M35 uses the little rods rather than the shoes resting directly on the pucks. As well, you will need the different boots. The part number for those are 5975.

Now it's very possible that somebody is making up the required combination of wheel cylinder and pucks that we need. But at least we know that the casting is available.

I'll be facing this challenge, possibly this summer when I start on my artillery tractor. In the meantime, if somebody tries these numbers and is successful, please post the results.