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How to recondition an old motor?

By: Dawn 10/7/2025 10:30 PM

I acquired some time ago, a 1984 F250 that hasn't been started in 15+ years. To anyone's knowledge, it was running fine prior to its long slumber, though this can't be verified. I was told, by my mechanic, that I should not try to start it without first relubricating the engine. He vaguely explained some long process and wants to take it to his shop. As much as I adore my mechanic, the less money I have to give him, the better. Is this something I can do at home? And how?

Comments (1)

The Beave
10/8/2025 01:02 PM
Yes. You can. First: Has it sat with the spark plugs in or out? This makes a huge difference. If it has had the plugs in the whole time, this is really not that big a deal. If it has had them out, then, well, this will work, but it may not be able to cure a really stuck ring or the rust scoring that WILL happen on the cylinder walls. The proper way to handle that is to rebuild the engine, but the following method is worth giving a go no matter what as long as you have about a week. You will want to get some plain jane ATF (automatic transmission fluid, the cheapest junk DEXRON III rated stuff you can find) and funnel a bit into each cylinder and let it sit. Obviously this requires pulling the plugs. Let it sit for a couple of days to let the ATF work it's magic. Once it has sat, using a long break bar and an appropriate socket on the main accessory drive pulley, move the engine about 90*. Yes, some of the ATF is going to be pushed out of some cylinders so put rags or paper towels ...
10/8/2025 01:02 PM
Yes. You can. First: Has it sat with the spark plugs in or out? This makes a huge difference. If it has had the plugs in the whole time, this is really not that big a deal. If it has had them out,...
Dawn
10/8/2025 10:27 PM
Thoroughly explained. Thank you. Lots to consider.
10/8/2025 10:27 PM
Thoroughly explained. Thank you. Lots to consider.
Dawn
10/8/2025 10:28 PM
It does have spark plugs in it btw
10/8/2025 10:28 PM
It does have spark plugs in it btw
The Beave
10/9/2025 02:35 AM
It'll be fine, then. The rubber bits all over will need replacing before you drive it anywhere, for sure. I'd probably drain and try to clean out the gas tank and filter, then fill it with some fresh gas with some seafoam mixed in (add half a bottle before you put in 5 gallons) and cycle the key, checking for any leaks as the pump pressurizes, then crank it over. It might just surprise you.