48 farmall cub cranking help

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Matt in nc
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Re: 48 farmall cub cranking help

Postby Matt in nc » Sat Aug 08, 2015 5:07 pm

I think I've found the problem I check again today to make sure the #1 cylinder was on TDC, the marks aligned on the front spindle and the governor marks were aligned and low and behold they are not, the engine is on TDC but the governer is off a bit do I have remove the front cover to turn the governer gear or can it be turned without removing the cover

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Bill Hudson
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Re: 48 farmall cub cranking help

Postby Bill Hudson » Sat Aug 08, 2015 6:33 pm

Eugene wrote:... Photo of the $700- wiring harness/stainless steel tube?


Yes, that would indeed be interesting.

Bill
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Eugene
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Re: 48 farmall cub cranking help

Postby Eugene » Sat Aug 08, 2015 6:37 pm

Battery powered ignition system? If so all you need to do is time the distributor to the engine.

First mark on the pulley to line up with the pointer on the engine front cover is 16 degrees in advance of TDC. Second mark to line up with the pointer is the TDC mark.
I have an excuse. CRS.

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
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Re: 48 farmall cub cranking help

Postby staninlowerAL » Sat Aug 08, 2015 6:57 pm

Matt in nc wrote:I think I've found the problem I check again today to make sure the #1 cylinder was on TDC, the marks aligned on the front spindle and the governor marks were aligned and low and behold they are not, the engine is on TDC but the governer is off a bit do I have remove the front cover to turn the governer gear or can it be turned without removing the cover

You did not say but assuming this is on the compression stroke.

Matt in nc
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Re: 48 farmall cub cranking help

Postby Matt in nc » Sat Aug 08, 2015 7:22 pm

Yes it's on the compression stroke

Matt in nc
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Re: 48 farmall cub cranking help

Postby Matt in nc » Sat Aug 08, 2015 7:25 pm

Eugene wrote:Battery powered ignition system? If so all you need to do is time the distributor to the engine.

First mark on the pulley to line up with the pointer on the engine front cover is 16 degrees in advance of TDC. Second mark to line up with the pointer is the TDC mark.


Please explain further Eugene I am not mechanically inclined but not as smart as most folks I know just enough to get me by. What second mark. I lined the pulley mark up with the pointer on compression stroke tdc. Then aligned the distributer rotor button on #1 plug it acts like it wanuts to crank just wont run

staninlowerAL
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Re: 48 farmall cub cranking help

Postby staninlowerAL » Sat Aug 08, 2015 8:09 pm

A '48 Cub would normally have a magneto unless it has been changed for a battery/distributor ignition system. Here's what the mag looks like:
Copy of magneto_plug wires.jpg

Here's a distributor with the cap and rotor removed:
dist1.jpg

Hope this is helpful. Stan

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Re: 48 farmall cub cranking help

Postby Eugene » Sat Aug 08, 2015 8:22 pm

The ignition system fires when the points open. The spark from the ignition system has to reach the cylinder when the piston reaches TDC.

Your engine belt pulley may only have one mark, that's TDC. Two marks explained earlier.

Basically, you need to install the distributor housing so that the #1 plug tower on the distributor cap is at about2 o'clock and that the rotor is pointing at the #1 plug tower position, and the points close to opening. This is critical and may take several tries to get it right.

Now you need to static time the engine. There is a video, I think, on this site on static timing.
I have an excuse. CRS.

staninlowerAL
5+ Years
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Posts: 3383
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
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Re: 48 farmall cub cranking help

Postby staninlowerAL » Sat Aug 08, 2015 8:30 pm

Still not sure if yours is a magneto or battery/distributor ignition system. Each one has some differences that must be considered when timing.

Matt in nc
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Re: 48 farmall cub cranking help

Postby Matt in nc » Sat Aug 08, 2015 10:22 pm

@Eugene and @staninlowerAL

I aligned the pulley mark with the engine pin with the #1 cylinder closest to the radiator on the compression stroke at tdc. I then went over where the distributer is pulled it and the part that slides into the governer as explained in the static timing video. The hash marks in there were not aligned with instead of it being at 2 and 8 it's at like 1 and 7. My distributer cap has no #1 marking anywhere on it I ordered it from ebay. So I didn't figure it matter as anyone one could be #1 the plug tower that I made #1 is pointing straight up as is the rotor. Since reading your post I see this is not correct.

I have read the plug wires on the cap go clockwise, if your looking at the cap and #1 is the first plug the second one to the right would be #2 then #3 and so forth correct? But the firing order is 1342 how do the plugs on the cap go to the individual pistons 1 being at the front 2 being the next one back matched to the dist. Cap or does it go 1 being first, 2nd plug tower going to number 3 piston, 3 tower going to number 2 piston and so forth?

I do not have the black box on top to the distributer anymore I was told to replace that with a 12v coil, so I did also ordered from ebay.

@Stan don't get frustrated at me but not sure what you mean, I have a battery that goes to a kill switch,light switch,a voltage gauge,the starter, distributer, the alternator,the 3 lights, and the coil. The tractor is no longer a positive ground 6volt it is a negative ground 12v. It's not on a key you still have to pull the rod to crank it.

staninlowerAL
5+ Years
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Posts: 3383
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: 48 farmall cub cranking help

Postby staninlowerAL » Sun Aug 09, 2015 8:34 am

Matt in nc wrote:@Eugene and @staninlowerAL

I aligned the pulley mark with the engine pin with the #1 cylinder closest to the radiator on the compression stroke at tdc. I then went over where the distributer is pulled it and the part that slides into the governer as explained in the static timing video. The hash marks in there were not aligned with instead of it being at 2 and 8 it's at like 1 and 7. My distributer cap has no #1 marking anywhere on it I ordered it from ebay. So I didn't figure it matter as anyone one could be #1 the plug tower that I made #1 is pointing straight up as is the rotor. Since reading your post I see this is not correct.
It sounds like your gear might be out of time one or two teeth. If so, it is possible to correct this by rotating the gear but someone else will have to guide you or do a search for that particular subject.

I have read the plug wires on the cap go clockwise, if your looking at the cap and #1 is the first plug the second one to the right would be #2 then #3 and so forth correct? But the firing order is 1342 how do the plugs on the cap go to the individual pistons 1 being at the front 2 being the next one back matched to the dist. Cap or does it go 1 being first, 2nd plug tower going to number 3 piston, 3 tower going to number 2 piston and so forth? Once you establish #1 tower, the second tower is #3 plug, third tower is #4 plug, last tower is #2 plug.

I do not have the black box on top to the distributer anymore I was told to replace that with a 12v coil, so I did also ordered from ebay. If yours looks like the first picture then you still have a magneto ignition, just the internal mag coil has been has been replaced with a 12v external coil. It still times the same as a regular mag. The attachment picture from the service manual should guide you on this if that's the case. Does your new 12v coil have a internal resistor or do you have a ballast resistor between the coil and the points?

@Stan don't get frustrated at me but not sure what you mean, I have a battery that goes to a kill switch,light switch,a voltage gauge,the starter, distributer, the alternator,the 3 lights, and the coil. The tractor is no longer a positive ground 6volt it is a negative ground 12v. It's not on a key you still have to pull the rod to crank it.
No problem, sounds like yours has been made a full 12v conversion except the distribution of the fire is still being done by a mag that has been gutted of the coil and magnet. If your entire mag was replaced with a distributor like my second picture in the other post, then disregard my previous comment. Hang in there, you'll get it figured out. Click on the picture makes it larger.
magneto_plug wires.jpg

staninlowerAL
5+ Years
5+ Years
Posts: 3383
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: 48 farmall cub cranking help

Postby staninlowerAL » Sun Aug 09, 2015 8:53 am

I found this old post that might help. You can go back and read it in its entirety.
magneto timing marks.JPG

Matt in nc
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Joined: Wed Aug 05, 2015 8:17 pm
Zip Code: 28513

Re: 48 farmall cub cranking help

Postby Matt in nc » Sun Aug 09, 2015 2:54 pm

So I'm going to have to pull the front cover off the motor again to turn the gears

staninlowerAL
5+ Years
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Posts: 3383
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: 48 farmall cub cranking help

Postby staninlowerAL » Sun Aug 09, 2015 3:19 pm

Not unless the crankshaft gear and camshaft gear were not timed correctly when the engine was reassembled. I think you can change the mag/distributor drive gear without removing the cover but someone else will have to tell you how to do it or you might find an old post on this. I know it has been discussed several times before.


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