1976 Ford 335 - Tractor and Engine Identification

New member to the forum, but have referenced it many times while researching this tractor.
I've this 1976 Ford 335 for 10-12 years now but hadn't had to do much other than basic repairs and up keep, and it's been a work-horse. But after an overheating issue last year it's in need of more in-depth engine work done to it.

Since this era of industrial tractors doesn't appear to be very well documented and some information contradicts others I figured I'd make this a two part post. 1) Get a second opinion on my stamped tractor identification numbers, and 2) absolutely try to verify which size engine it has. Any and all labels under the hood are long gone, so all I have to go by is what I can make of the stamped numbers and casting numbers found on it.

1) Tractor -
Model: CU212K
C - Ford 3000 Series
U - Utility
2 - ?? (possibly making it a Highway Utility)
1 - Diesel
2 - Trans 540 PTO
K - 6/4 Manual Reversing Transmission

Production: 6L04B (third digit looks kind of like a weird 6 or 0, but 6 wouldn't make sense as part of the "day" code
6 ? 1976
L - Nov
0 - Day
4 - Day
B - Day Shift

Serial: C549468 or C349468 or (double stamped first digit, 5 makes more sense to me)

2) More importantly is the engine identification. Trying to line out parts to order prior to having to dismantle it and figure it out that way. It has the 3 cyl diesel. Plenty of places say it "should be" the 175 CID, but I see more of the 192 CID stuff listed when trying to look up parts and such. My understanding is this tractor is based off a 3600, which had the 175, but a 3610 had the 192. A 340A had the 175, but a 340B had the 192. Etc, etc, so that only adds to the confusion. I've seen the same casting number referenced as being any of the three potentials (175, 192, 201), but then I'v seen where the end letter designation may distinguish them apart. I had also read where the letter on the serial number on the engine block might confirm one or the other. So I'm looking for input from forum members on what they think based on decoding my engine numbers. Heck, I don't even know if what's in it is original, most likely is though.

Casting - D5NN6015F
Serial - C090422 (or C090423)

Stamped on the front/right side of the engine block - (this is what I'd like to find some way to decode)
T
61E12
6E19B

Thanks ahead of time for any input.
 
Tractors made after 1975 used a different coding for the first three characters of the model number than the 1965-1975 thousand series tractors did.

CU2 is a 335 made after November 1, 1976 through the end of 1978. From 1/1/75 through 10/31/67 they used CU1.

The last 3 characters of hte model are used basically the same as the earlier series, so diesel engine, trans driven PTO and 6x4 manual reverser are all correct.

You got the date code correct as well, November 4, 1976 during the day shift.

C549468 makes more sense as the serial number than C3549468, as that serial number is listed as a very early 1977 serial number but the numbers posted on most internet sites are always subject to a little bit of a fudge factor from my point of view, so it could be a very late 1976 serial number which would agree with the date code. I always believe the date code for a late-in-the-year or early-in-the-year tractor where the serial number puts it just outside of the year that the date code says it is.

ptfarmer is correct that the original engine was a 175 ci with a 4.2" x 4.2" bore and stroke and I would assume that is what it has unless there is any indications that it has been swapped out, like the engine block is a different color paint, or has a different color paint under the top coat than th erest of the tractor. That block casting number was used for multiple 3 cylinder engines of that time period. Form a quick Google search that casting number was used on blocks for 158, 175, 192 and 201 ci engines.
 
Thank you kindly to all that have replied thus far, really helps narrow down and confirm a few things.
I'm going to try and post or link to pictures as soon as I figure out a good way just for future reference.
I'll try adding a link to a photo album, otherwise it looks like I have to resize all my pictures. (still getting used to this forum setup)

Am curious as to what technical differences there are between a CU1 and a CU2 model might be.
Doesn't affect what I'm doing on mine, just a curiosity.

The engine does appear to be original to me, pretty certain it's the 175 CID as you all have stated. And learning that the bottom number stamped on it is a date code (6E19B) makes sense. Didn't even dawn on me it was the same format as the tractor date code. So thanks for that.

Any ideas what the 61E12 might represent on the engine? (maybe specific model, configuration, etc?)
1976 Ford 335 Tractor
 

Every major part is date stamped, engine- lower right front, trans-left side of clutch housing, rear axle housing- top of the flange where the axle housing bolts to the trans, lift top- right side in front of the lift shaft.
All of these numbers should be within a few days to a few months prior to assembly date.
Yours could be all original but it's a bit odd for a engine to set in inventory for six months before being installed during the tractors assembly.
On older -000 models like mine I've never seen date stamps more than a few months apart.
Just saying want I've seen, doesn't mean I'm right.
 
(quoted from post at 13:14:32 03/17/17)
Every major part is date stamped, engine- lower right front, trans-left side of clutch housing, rear axle housing- top of the flange where the axle housing bolts to the trans, lift top- right side in front of the lift shaft.
All of these numbers should be within a few days to a few months prior to assembly date.
Yours could be all original but it's a bit odd for a engine to set in inventory for six months before being installed during the tractors assembly.
On older -000 models like mine I've never seen date stamps more than a few months apart.
Just saying want I've seen, doesn't mean I'm right.

I have never seen the component date codes be more than 3 months or so earlier than the build date of the tractor on the '65-'74 thousand series either, but I have seen a few tractors from the late 70's through the mid 80's (x600 & xx10 series time frames) that had the date codes for the assembly of some of the individual components be as early as 9 months prior to the build date of the tractor, and that was all on the foil sticker under the hood, not just the stampings on the individual components.

I think that was when they were building all transmissions in one plant, all of the rear axles in another, and the engines in another, and then and shipping the already assembled components to the other factories for final assembly of the tractors for the local markets, so the engine in a tractor that was assembled in the same plant where they assembled the engines would be date stamped a few weeks prior to the assembly of the tractor, but the rear axle or transmission that was assembled in another plant might have a date stamp of several months earlier.
 
Here's what I found on mine:

Tractor - 6L04B (04Nov1976)
Engine - 6E19B (19May1976)
Trans - 6J24B (24Sep1976)
Rear Axle - 6J28B (28Sep1976)
Lift Top - 6G19B (19Jul1976)
 

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