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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
Location: Ashville, NY
Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Topic: HELP!!
    Posted: 02 May 2016 at 4:48pm
At the end of last year my ('39) B started running 'off'. I pulled the head and found that the top compression ring on the 3rd. cylinder was broken. So in goes a new set of rings, thinking 'this will solve the problem', but no, it didn't. It runs better, but not right. It starts hard, sounds like it is missing on 1 or 2 cylinders (maybe?) I tried adjusting the timing, but it didn't change anything. Also, it idles up and down by itself. Anyone know what it's metter is? Could it be the coil? (it has a distributor on it.)
'39 Model B
Tractors are cheaper than girls, remember that!
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bluewavecaptain View Drop Down
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Joined: 17 Sep 2013
Location: Two Rivers, WI
Points: 90 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bluewavecaptain Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2016 at 4:57pm
Check your compression. Maybe the valve lash needs adjustment?
Charles(Two Rivers,WI)
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Leon n/c AR. View Drop Down
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Joined: 19 Mar 2013
Location: Heber Springs A
Points: 175 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leon n/c AR. Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2016 at 8:16pm
Did you double check that you had plug wires in correct order. Also have you checked dist. shaft. Leon
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Ted in NE-OH View Drop Down
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Joined: 12 Nov 2009
Location: Austinburg OH
Points: 1703 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ted in NE-OH Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2016 at 8:32pm
Check spark plug wire locations. Firing order is 1-2-4-3. It is easy to mix up 3 and 4.
CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914
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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
Location: Ashville, NY
Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2016 at 7:15am
When I took the plug wires off I marked them with a permanent marker as too witch cylinder they came off of, so I think that they are correct. Maybe I will try switching #'s 3 and 4 around and see if it runs better. That won't harm the engine, right?
I will check the compression.

@ Leon: What do you mean by check the distributor shaft? 
'39 Model B
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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
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Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2016 at 4:42pm
I switched the plug wires for cylinders #3 and 4, and it ran a TON better! (Thank You, Ted and Leon) No idling up and down, it still 'pops' a tiny bit, but that might be caused by the valves needing adjusted? Also, it starts a little bit hard, but maybe that is also connected to the valves?
The valves are supposed to be adjusted to .010, correct?
'39 Model B
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Dmpaul89 View Drop Down
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Joined: 06 Mar 2013
Location: Edwardsville,IL
Points: 1689 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dmpaul89 Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2016 at 5:03pm
Put timing back where it was. dont worry about valves yet. your way ahead of yourself there. start simple.  check fuel flow, maybe adjust mixture screw on carb if it has one. make sure points are clean not pitted (they can pitt fast if not set right).   Your jumping straight to worst case scenarios 
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Ted in NE-OH View Drop Down
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Joined: 12 Nov 2009
Location: Austinburg OH
Points: 1703 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ted in NE-OH Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2016 at 5:33pm
.010 HOT. I do .012 cold
CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914
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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
Location: Ashville, NY
Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 8:24am
Originally posted by Dmpaul89 Dmpaul89 wrote:

Put timing back where it was. dont worry about valves yet. your way ahead of yourself there. start simple.  check fuel flow, maybe adjust mixture screw on carb if it has one. make sure points are clean not pitted (they can pitt fast if not set right).   Your jumping straight to worst case scenarios 

The points are good. The reason I was wondering about the valve adjustment was because I took it all apart a little while ago. I did check the valves with a feeler gauge yesterday, and they all seemed pretty good. (.010, or just slightly above) So I don't think that they are the problem. I will try checking the fuel flow, and tweaking the carb a tad. 
'39 Model B
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Leon n/c AR. View Drop Down
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Joined: 19 Mar 2013
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Points: 175 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leon n/c AR. Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 12:15pm
BenGiBoy I was referring to wear on dist. shaft or bushing. If it has any slack you can see the point gap change by pushing back and forth on the shaft. Leon
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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
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Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 12:50pm
Originally posted by Leon n/c AR. Leon n/c AR. wrote:

BenGiBoy I was referring to wear on dist. shaft or bushing. If it has any slack you can see the point gap change by pushing back and forth on the shaft. Leon

Okay, I will check that. Thanks.
'39 Model B
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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
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Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 12:53pm
Checked the fuel flow, it seemed fast enough to me. I disconnected the fuel line at the carburetor and opened the valve on the sediment bowl, and the line was pouring out as much fuel as could come out at once. (without pressurizing the system, I suppose). 

I will try adjusting the carb. this afternoon, probably. I'll keep you posted. Wink 
'39 Model B
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tadams(OH) View Drop Down
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Joined: 17 Sep 2009
Location: Jeromesville, O
Points: 10883 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tadams(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 1:22pm
It's a 39 B, does it have a distributor, have you taken the mag off and put a distributor on?
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Dmpaul89 View Drop Down
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Joined: 06 Mar 2013
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Points: 1689 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dmpaul89 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 1:23pm
Champion plugs? if so throw them in the garbage
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BenGiBoy View Drop Down
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Joined: 11 Nov 2015
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Points: 705 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BenGiBoy Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 1:36pm
tadams;
I bought it with the distributor on it.

Dmpaul89;
It has Autolite plugs.  #295 if I am remembering right.
'39 Model B
Tractors are cheaper than girls, remember that!
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