Maybe a dumb question, but I was reading the service manual while doing a particular project and it occurred to me that not all the specs are given. For example, they say if the front spindle bolt has .003" of wear replace it. OK, great, what is the original measurment supposed to be?
I see other things like this too. Are these in the service manual and I just don't see it? I know alot of you guys just know some of these off the top of your head, but you must have found somewhere previously.
I will try to give you some generic knowledge. With rare exception T parts were manufactured to "nominal conventional (what I call imperial as a Canadian) dimensions" So if you measure the spindle bolt and it is .003 smaller than 1/2" then it would be at the wear limit.
Another way to figure out something like this is as follows;
Most things don't wear uniformly. They will wear at the point of maximum load generally. Take your spindle bolt example. It will wear in the location of contact with the bushing. In the middle of it there is no contact. Usually you will see a "wear pattern" in the contact area. In the area of no contact you will see the original machining marks (usually these will be consistent repetitive small surface markings).
I hope this gives you some help to figuring out this on your own.
In the back cover of Lang's catalog,you will find a lot of them.
Don't worry about the original dimension.
You'll need to ream new bushings anyway.
Strive for a perfect slip/slightly snug fit and it'll be fine.
I don't think Chad's question is dumb at all...maybe because I've had the same problem.
I was trying to figure out what the std. output shaft diameter was supposed to be so I could order a re-babbitted ball cap. No dimensions in the MTFCA engine rebuilding or transmission manuals. Finally found it in Langs catalog on the ball cap part page.
Now, I trust Don Lang but a single resource sure would be nice. While I agree with Les Schubert's observation on standard dimensions, the 1.561-1.558 dimension I was looking for is not intuitive. What resource am I missing?
For specs not shown in Lang's catalogue, you want the MTFCA books.
Steve, I have the "Jelf shelf"... Some things just aren't there!
Sounds like a good project for some volunteer who has the time and inclination: gathering all the specs from various sources. No one source seems to have all of them.
Thanks guys. I looked in the back of my 2011-2012 and 2014 Lang's but it only has engine specs.
I would be willing to compile over time if there were willing participants that could supply the dimensions of various things. I personally would put it in an Excel format, but could put it in other formats to so it is easy to share on the net.
I worked for and am a big Chrysler nut. In their Factory service manuals of the 60s- early 2000's that I am familiar with, at the end of each section, they have any and all specs you would ever want and need along with tolerances and if applicable torque specs. It makes it super nice when you really want to know something. I think it would be a great resource to have it in one spot for the Model T'ers--kind of a quick reference if you will.
As an example of what I would want is say rear axle roller bearings. They are supposed o be about .500", but we find use acceptable at around .496-.498" if I recall right. This is the other problem, some of us just forget over time.
Anyone interested in supplying info, can email me at crazydart400 AT yahoo.com , just replace the AT with @ if you didn't know.
You can find some factory dimensions in the 1923 Ford Dealer data book here at MTFCA's website:
Who needs specs, when all you need is one thin dime!
But the older it gets, the thinner it becomes.