In Reply to: 9N Piston Sleeve posted by ALZ(MO) on November 11, 2020 at 22:54:41:
Take the tractor, or if you can, just the stripped down engine block to a trusty, experienced in old Fords, local shop that does rebuilds. They can evaluate and tell you exactly what is going on and what to do to make right. FORD (all vehicles, not just tractors)used steel cylinder sleeves til 1950. That is what the STAR (*) symbol before and after the serial number indicated. When they changed to cast iron liners, the s/n was then stamped with a diamond (<>)symbol fore and aft. It is a moot point nowadays because they only make and sell cast iron cylinder liners. That being said, it is possible your engine still has the old steel liners. Whatever. The shop will boil the block and check for cracks and such and tell you what you need to do as far as replacing with new liners and possibly having to have the cylinders bored to fit. A good shop will be able to then bore the cylinders and get the right size pistons and assemble back into a rebuilt motor. They can also inspect the head and oil pump and work on those too. Your engine is the tractor's heart and soul. I wouldn't take any shortcuts nor apply quick-fix Band-Aids to try and fix. You want it to be right and give you many years of grief-less operation, right? You need to pull and inspect the engine. You are half way there at this point to a rebuild, so why not do the job right the first time? Maybe start a special fund in the collection plate to finance the project, but don't take shortcuts, it won't be worth it in the long run. Know too, that all 9N and 2N models, '39-'47, used the '9N' prefix in the serial number. They are also the same basic tractor after s/n 12500. There are other very important things you need to know. Is the tractor the OEM 6V/POS GRN electrical system or has it been switched out to 12V? The #1 most misunderstood function on old Fords is the 6V/POS GRN system. It confuses many because they only know and have worked on their 12V cars and trucks. Therefore when a non-starting arises, they automatically assume it is a 6V electrical issue and thus try an switch out to 12V, with many crossovers being done incorrectly and ending up with more headaches. The #2 most misunderstood function on old Fords is the Front Mount distributor. It often is mystery to folks who aren't familiar with it. Either way, 6V or 12V, if it isn't wired correctly, you will have non-starting issues. Regardless, the best investment you can make is to get copies of all the ESSENTIAL MANUALS and read like your Bible. The OEM FORD 9N/2N Service Manual, the CLYMER I&T FO-4 Manual, and the 39-53 MPC, better yet, an MPC copy of the model year for your tractor, are valuable tools to have in your shop.
FORD 9N/2N ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:
FORD N-SERIES TRACTOR WEB SITE FOR HOW-TO’S AND MANUALS INFO:
Tim *PloughNman* Daley(MI)