Did model T rod assembly’s have shims from the Ford factory?
No, also shims for the rods were not available from Ford as a spare part, never listed in parts books other than change over rods. However the mains had factory shims.
From Parts Listing in Bruce's CD:
There was a service part for a paper shim for the rods. Plus, the rods sold for service were 'rough' Babbitt as noted in the Parts and Price List with double++ in front of the part #. So those service rods had to be scraped and fitted to the in service crankshaft.
T-640 1920F 1908-20 Shim, connecting rod broaching. Paper gasket, .003" thick
T-641 3024 1912-22 1909-22 1915-20 Connecting rod. 1-3/8" bore with 1/16" Babbitt
T-641AR 3024B 1923-27 1909-27 Connecting rod .025" undersize. For service
T-641B 3024 1923-27 1909-27 1924-27 Connecting rod. 1-3/8" bore with 1/16" babbitt, light weight
I think Dean is asking about “Factory” rods (the rod that came in a new Model T). NOT “service rods” (the rod you could buy from any Ford Garage). There is a big difference.
Unfortunately, many people have viewed the print for the “service rod” and don’t realize that it is not the same as the rod used in new engines at the factory.
I agree with Adam on this, the topic was ran through a few years ago, also the .025" would have been a mis-print, .0025" would have been correct as Ford would recommend a new shaft if warn past a few thou, not a grind of 25thou.
Am I understanding this right...there were no shims installed at the factory ? How would a guy deal with normal wear of the babbit ? Install new rods once the originals got loose ?
I’m waiting for the other shoe to drop... I have a suspicion that Dean is waiting for this thread to run a while, then may have some new information to present?
Ford service/work shop and service bulletins cover the way you tighten the big ends, never a mention of the option to remove a paper shim from a factory built engine, what is or was done, was to file the rod caps.
I found the print for the .003 paper gasket broaching shim T-640 .
T-641 connecting rad assembly drawing clearly states to be removed before assembling on crank shaft.
Makes sense to do so on a rebuild that you can start with the removal of the shim, just the word in it's self, broaching is re-shaping or removing material to make a correct fit on a worn shaft, maybe if one bought a change over set of rods the fitting instructions would have accompanied them. Production line assembling surely wouldn't allow the time for such fitting, hence the burnishing of bearing finishing. Ford also gives instructions for an in-car burnish of the bearings after a work-shop re-ajustment in a service bulletin.
Back in the day the way of fitting things are a little scary compared to today's ways of machining.