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Old 07-28-2006, 11:00 AM
Boxcar2282 Boxcar2282 is offline
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Exclamation Looking for some help w/my 239

I have a 51 F3 with 88k on it. Sat since 79. After a week of MMO, rebilt the carb, plugs, wires, points condenser, fresh gas and battery she fired right up....OK not right up...but she fired and ran....the compression is crap so I'm guessing a rebuild is needed....I've been quoted 3500 and 3 months...This is too steep for me right now....I have moderate mechanical abilities, but have never rebilt myself....Suggestions please!

Thanks,
Bill

ps- I'm in Connecticut, so EVERYTHING is expensive!
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Old 07-28-2006, 01:32 PM
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sosotwo sosotwo is offline
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you might to try putting a quart of transmision oil in the engine and running it for a while and see if the rings and valves un stick might be all it needs sometimes they will stick if they have sat for a long time
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Old 07-28-2006, 01:54 PM
Boxcar2282 Boxcar2282 is offline
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I did get the valves free....but still have low compression
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Old 07-28-2006, 04:15 PM
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merlynr merlynr is offline
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Try removing the sparkplugs and squirting some oil in the cylinders and then take a compression reading after cranking it a little bit. I have heard that this will tell u if the compression loss is the rings or valves. If compression goes up, it is the rings. If stays the same, it is valves. What is compression reading anyway?
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Old 07-28-2006, 05:01 PM
Boxcar2282 Boxcar2282 is offline
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I've freed up the valves...the "good" cylinders are between 85 & 100....I have 2 @ 55 and 2 @ 0....I don't think anything short of a rebuild is going to help
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Old 07-28-2006, 10:02 PM
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If it were mine, I'd probably be pulling the heads off and looking at the valves cause even if you have it rebuilt, it ain't gonna hurt anything to have a peek.
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Old 07-28-2006, 10:10 PM
kpm999 kpm999 is offline
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I agree that a look inside is in order and that to keep the truck original (if you care to) then an overhaul could be educational and fun(if you have another ride)That is how I got into the bussiness.
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Old 07-28-2006, 10:12 PM
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You can take it apart and re-hone the cylinder walls, then install new rings. It's not rocket science and only requires a few tools not normally in the average homeowner's shop. There are several books on rebuilding a flathead. Amazon.com has many of them or you can find them on ebay. The one by Frank Oddo is good for normal stock to hot builds.

88000 pre-79, hmmm back then 100K was the benchmark for flathead engines before a rebuild was required.

It would be good to know what your cylinder walls look like anyway and to make sure there are no cracks in the block that will cause problems later. If you can read a micrometer and are handy with tools its a fairly simple job. If you do decide you need a complete rebuild, you just need a decent machine shop that remembers how to bore & hone a flathead.

Take tons of notes, pictures, more notes, bag and label everything you take apart.
1. Don't mix up the crankshaft main journal caps and keep track of which way your bearings came out. (pairs, direction, etc.)
2. Keep your connecting rod caps with the right con rods and make sure to put them back in the same order and orientation you took them out.
3. Ford cylinders are numbered front to back passenger side 1-4 and driver's side 5-8 and don't get turned around when you have the block upside down and backwards.
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Old 07-29-2006, 09:31 AM
kotzy kotzy is offline
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I have to agree with the idea of running some oil or upper lube thru the engine before
opening it up. Tell you what I would try is kerosene, pour it down the carburator while
it is running. Make sure it's outside as you'll have a lot of white smoke. Compression of 85 to 100 is about all those engines made, I think if you can get the valves which were open or slightly off the seat on the poor cylinders to join the party she'll be ok. Nothing ventured nothing gained. These methods were used on any number of car engines which were stored during WW2.
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Old 08-01-2006, 10:22 PM
R Pope R Pope is offline
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You've probably got a few stuck valves. A flattie is easy to pull the heads and tap them down to loosen them up. If that doesn't work, pull your intake and remove the stuck valves, still not that big a job. When the valves and guides are out, its easy to free them up.
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Old 08-09-2006, 10:09 AM
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I would pull the intake first. Easier, only one gasket and you can see all the valves and which ones are stuck.
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Old 08-09-2006, 10:09 AM
 
 
 
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