Farmallregular
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Posts posted by Farmallregular
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23 hours ago, Charlie van Rensburg said:
I am just not sure about the “ impulse coupling. As in, does it make a snap for each cylinder when you crank the engine”
What is a impulse coupling?
See response in your other thread about ignition timing.
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21 hours ago, Charlie van Rensburg said:
Hi
Thank you very much for the positive replies.
Please help me to understand the terminology “impluse should trip just after top dead center”
Thank you very much.
The starter usually won't turn the engine fast enough for the magneto to generate a pulse, so most magnetos have a mechanism on the input shaft that holds the armature against a spring and then will trip at a specific point in the shaft rotation and let the spring rotate the armature fast enough through part of a turn to generate the necessary pulse. The points will open near the end of this partial rotation to generate the spark. This mechanism is called an "impulse", and is bypassed (usually with centrifugal weights) when the engine is up to speed. Often you can hear it trip with the engine cranking.
Keith
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The latter part of 1926 was when the change was made from a 12 volt single unit starter/generator to separate 6 volt generator and starter.
The 12V single unit starter/generator was chain driven from the front end of the crankshaft. The two unit 6V starter drove the flywheel, and the generator drove off the same shaft that drives the distributor. The distributor position is also different between the two versions.
There are significant external differences in the blocks to accommodate the different placements, and I'm not sure what the differences in the two versions of the cranks might be. I haven't looked at the specs, but I'd suspect that internals like bearings, pistons, valves, cam, etc. are the same.
Do you have a copy of the Mechanics Information Manual? It's readily available on ebay, and I think Myers Early Dodge has copies as well. There are photos of the two different configurations.
Keith
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Could be worse...my Model A has a standard 3-speed shift pattern, and my 1924 Dodge has the pattern upside down...the Model A is the same pattern as the vehicle I learned to drive in, but I have to really pay attention in the Dodge...
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Another hobby is antique tractors, including a 1929 McCormick-Deering Farmall. When the F-series tractors were introduced in the early 1930's the original Farmalls acquired the moniker "regular" to distinguish them from the similar F-20.
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On 1/10/2024 at 8:46 AM, Frank DuVal said:
All fuses have voltage and current ratings. 😉
Voltage does not “blow” a fuse, excessive current flowing through it does.
Exceeding the voltage rating means there may be an arc started by the fuse opening (“blowing”) that lets current continue to pass. Like the spark of a spark plug, current is flowing with an open in the circuit when the voltage exceeds breakdown voltage. Not a desirable operating condition of the circuit protected by the fuse.😲
To add a little more info, fuses also have an "interrupting current" rating, which is indicative of the short circuit current the fuse can safely break.
In general, it's acceptable to use a fuse with a higher voltage rating than the circuit it's used on, but not a lower voltage.
If you really want to understand fuses, here's a good reference: https://www.digikey.com/en/pdf/l/littelfuse/fuseology
Keith
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1 minute ago, hddennis said:
Funny you should mention that. after total failure here I looked up the 2 closest Model A clubs and one totally ignored multiple emails and the oher refused to answer multiple phone calls even though both were listed as contact people??
Howard Dennis
That's interesting...the club I belong to here in Colorado goes out of the way to help newcomers.
I've never changed a spring perch, so can't directly help you there. I'd strongly recommend signing up and asking your questions on the Vintage Ford Forum...very helpful group of people.
It'd also be worthwhile to buy a copy of Les Andrews' "Model A Ford Mechanics handbook". It's available from any of the Model A suppliers and on Amazon.
Because there are other forums dedicated to Model A's, there's very little activity here. I come to the AACA forums mostly because I also have a 1924 Dodge, and there is a relatively active group of old Dodge people here. I only occasionally look at the Model A posts.
Keith
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You need to go to one of the sites that specializes in Model A's, Vintage Ford Forum or Ford Barn, links at the top of this section.
Keith
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It was probably originally crimped around the edge to hold the glass in place. Unless you can replicate that process you won't be able to replace the glass.
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An analog ohmmeter can tell you if the condenser is open or shorted, but can't directly measure capacitance. As a quick check, you can compare the meter response with the condenser in question to the meter response with a known good condenser. I've seen people claim to be able to do a similar test with a digital multi-meter, but that always looked suspicious to me, although a digital meter will find a short.
Different meters may require different range settings. Start with something in the 10K range. Try the measurements a couple times with a known good condenser to get a feel for how the meter responds.
Ohmmeters measure resistance by applying a known voltage and measuring the current. When you first connect the ohmmeter to an uncharged condenser, it shows relatively low resistance as the current from the meter starts to charge the condenser, and current decreases, i.e., shows higher resistance, as the condenser charges. Swapping the leads charges the condenser in the opposite direction. Once the condenser is charged, it should show high (10's of thousands) ohms resistance
If there's no "bounce" in either direction, and the meter shows a high value of resistance, the condenser is open. If the meter shows a low resistance value after the "bounce", or a low resistance with no bounce, the condenser is either shorted or leaky.
Some higher end digital multimeters have a capacitance measurement function, if you happen to know someone who has one. You can also buy relatively inexpensive digital capacitance meters, although I have no experience with them. Ignition condensers are typically around 0.22 microFarads (uF).
Keith
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Adjusting shims is intended to compensate for babbitt bearing wear. To re-iterate, if the crank has been re-ground undersize you'll need new babbitt, and the mains will also have to be line bored to size after installation in the block.
Bearing clearance on these engines was originally set by filing shims until you could feel a little drag when turning the crank. If you use platigage, be sure it's fresh...if the plastic has dried out it'll be harder than the babbitt metal.
The Mechanics Information Manual is generally available on e-bay as well.
Keith
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Is there some reason you think the ignition timing may be off? Has someone messed with it?
Number 1 is the front cylinder (closest to the radiator). My mechanics manual doesn't talk about timing a magneto, only timing a distributor, but if it's like other engines with magnetos the impluse should trip just after top dead center with the advance lever in the starting (fully retarded) position. If it trips before top dead center the engine can kick back against the starter, not good.
The C/14 mark on the flywheel is top dead center. With the number 1 cylinder on compression, the magneto should trip just after the TDC mark. The manual talks about another mark just past TDC, if it's there that is probably where the magneto should trip.
It would have originally had a vacuum fuel tank/pump on the firewall, if there's an electric pump someone has added it somewhere along the line. Be careful with an electric pump, the carburetor was originally gravity fed from the firewall mounted tank, and can't take much fuel pressure.
Reproduction Mechanic's Instruction Manuals are readily available on E-bay, if that's an option in South Africa.
You might also ask in the Dodge Brothers portion of this forum, someone else may have one with a magneto.
Keith
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On 12/20/2023 at 9:01 AM, 22touring said:
Also, I noticed that although the starter-generator cranks the engine just fine, it is not charging the battery. I wonder why not?
Now it's "on to my next restoration"!
Check the fuse on the starter/generator. It's in series with the field windings and acts as a crude over-voltage cutout.
Keith
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Unfortunately, a lot of these shows aren't a whole lot more than hour long advertisements for how great that particular shop is. Some of the projects are interesting, but I get tired of all the nonsense & drama that goes along with the build.
I like the various iterations of Road Kill, which are basically car related entertainment that doesn't try to be anything else. Roadworthy Rescues & Chasing Classic Cars are also entertaining.
Keith
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It would still be good to know what kind of a connector you're dealing with, maybe help someone else.
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37 minutes ago, George Albright said:
Never mind the sun and sitting has ruined all of the cars runner components 😬😳
According to the article, 429 of them are still in active service. The picture was from when they were first delivered, not ones sitting for all this time...
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1 hour ago, dodge28 said:
The best cable to use is a 2 zero piece of welding cable, Get the terminals from your from your local welding supplies. Peel about half of an inch insulation, hold the terminal in vice and fill it half way with melted solder and slowly insert the cable in and keep the heat for about 3 minutes until the solder penetrates the cable. You may add shrink tube.
1 hour ago, dodge28 said:Because the welding cable is pliable it can be used as a ground strap.
Inserting a large cable into molten solder is a good way to end up with a cold joint, plus if you're going to solder the connection you need to make sure it's well fluxed (rosin, NOT acid flux). General rule is that the connection should be mechanically secure before applying solder.
A welding supply house will have terminal lugs, but probably won't have the battery connectors, which is why you need to go to someone who deals with engines and starting batteries
2-ought (also written as 2/0 or AWG 00) cable is difficult to solder without melting the insulation since there's so much thermal mass, plus having the solder flow up into the cable can result in a brittle joint that's subject to cracking. I know a lot of people successfully solder big battery cables, but there's a reason most automotive connections are crimped and not soldered.
Adding heat shrink over the connection is a good idea, just remember to slide it over the cable before you install the terminal.
There's no reason for a "ground" connection to be any more flexible than the hot side connection...an easily bendable cable or braid will make connection easier if the ground connection point is close enough to the battery that a heavy cable doesn't want to bend.
Keith
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I'd go with at least 2/0 rather than #1. Any place that deals with over the road trucks will have or can make cables. I've also used welding cable and crimp fittings (if you have an appropriate crimp tool) for things like 6 volt antique tractors. Some people will also solder the terminals, although a properly done crimp shouldn't require anything else.
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Pictures, or at least a reference to the type of fitting would really help. An air fitting with straight threads would have to have some sort of compression surface to make the seal. A flare, maybe???
Unfortunately, I don't have much faith in technical advice from someone behind the counter in a parts store. Unless you are fortunate enough to find an old-line parts guy who hasn't retired yet, you'll be talking to a computer jockey who really doesn't know anything about what they're selling beyond what's shown on the computer. Sad, but that's the current state of affairs.
Keith
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Motors manuals (and I assume factory service manuals) were written for professional mechanics and for something like pulling/installing an engine they would only address procedures/requirements that were unique to that particular installation.
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9 hours ago, erichill said:
The inside diameter of the rim where the tire bead sits is 25" If I am understanding correctly to determine tire 34-25 = 9 dived by 2 gives 4.5
so use 34x4.5 tire? I apologize I wrote it wrong above.
Measure the diameter of the tire bead & see if it's close to 25" If not, you may have the wrong size tire. It shouldn't take a whole lot of pressure on the rim spreader to get the ends to go back together. You might post a picture of how you've got the spreader located in the rim, you need to position it so that it pulls the ends of the rim apart.
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Do you have a compression ring on the end of the tubing? If so, did you replace it with the one that came with the new fitting? Once they've been compressed they'll never seal again in a different fitting.
Teflon tape is not a good idea in an air fitting that depends on compression to seal, too easy for a thread to get into the compression surfaces.
Keith
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On 11/25/2023 at 11:45 AM, Hans1 said:
in the later 50's, a belt loop on a brown leather slip stick holder was a sign of future engineer..............
That lasted into the early 70's...I started college in 1971, and how to use a slide rule was part of a required first quarter course for all engineering students. I think I still have my copy of the CRC handbook of math tables.
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If you find one that's the correct size, I'd be interested in the one you have...save me from having to fabricate something.
Thanks,
Keith
Risk of living on a steep hill
in General Discussion
Posted
No parking brake??? Left in neutral???
I also learned to drive in an area with lots of hills, and had how to park on a hill beat into us by the driver's ed teacher...try parallel parking on a steep slope with a 3 on the tree transmission. We were also taught to turn the wheels into the curb, lots of fun with no power steering.
Wheel chocks (chalk is too soft) are a safety item to ensure the vehicle can't inadvertently move, but unless there's something wrong the vehicle should be able to hold itself in place even on a steep hill.
Keith