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Discussion Forum

My B is burping....HELP!

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Farmer in the Dells (WI)

06-12-2003 22:07:50

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My '47 B has begun to act up. It seems to pop under light load such as at the base of a hill especially when the mower is running. I use it primarily for mowing. It sounded like it was almost a metallic noise internally but upon closer inspection seems to be coming from the oil filled air cooler. It has also been running a little warmer than usual. I have to add coolant once in awhile where I never had to before. I know the oil seal is leaking and I watch the pressure gauge like a hawk so I know when to add some. I use 15-40 Rotella because it seems to slow the leaking down. I do not use this tractor in winter. I am going to replace the float, needle, and seat but I don't think that is my problem. I will pull the plugs to see if they are carboning or not and if they all look the same. Lately the oil leak has become worse and I noticed the oil is very thin. The temp generally runs from mid normal to high normal but usually does not exceed that range. As suggested earlier here, I have drained and washed and cleaned the tank, gone through the carb twice, and replaced the screen. I also noticed I have lost considerable power in 3rd gear. I now run it about 25% higher on the throttle and still notice a loss of power. What could I be looking at here? Any more suggestions would be appreciated. Thanks

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06-15-2003 18:39:07

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 Re: My B is burping....HELP! in reply to Farmer in the Dells (WI), 06-12-2003 22:07:50  
I have to agree with the other fellows on the compression check. These guages are cheap insurance.

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06-13-2003 20:17:27

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 Re: My B is burping....HELP! in reply to Farmer in the Dells (WI), 06-12-2003 22:07:50  
Farmer, I would wonder what you are using for plugs. Champion plugs have caused many people MANY problems. I'd go with another brand when you change them.

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06-14-2003 13:07:32

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 Re: Re: My B is burping....HELP! in reply to Scott, 06-13-2003 20:17:27  
An exhaust valve not opening will cause popping in air filter due to exhaust venting when intake opens.

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06-14-2003 06:28:53

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 Re: Re: My B is burping....HELP! in reply to Scott, 06-13-2003 20:17:27  
and use copper plug wires, not high resistance carbon fiber, when you change plugs.

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06-13-2003 18:22:20

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 Re: My B is burping....HELP! in reply to Farmer in the Dells (WI), 06-12-2003 22:07:50  
I may be way off base, but i have a couple other ideas.
--it gets hotter than normal and the oil is thinner. those two things go together. maybe the thermostat failed or is stuck and you are not pumping as much coolant thru the motor? might want to pull the top hose and thermostat housing and look.
--back fire and popping can be valves sticking, or no clearance on cam to lifters. i would pull the valve cover and look at three things. 1. does each valve have .015 clearance at some point as you rotate the motor?
2. rap each valve stem on the top and see that the valve moves up and down easily in the guide.
3. look at the freeze plug below the valves in the head and see that no weaping of water is evident.
---good luck

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Steve in N.J.

06-13-2003 05:05:14

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 Re: My B is burping....HELP! in reply to Farmer in the Dells (WI), 06-12-2003 22:07:50  

Your symthoms could be just a misfiring spark plug, or a contact set that needs the gap to be checked. Misfires and backfires that just start for no apparent reason, sometimes is ignition related, which causes the "down on power" problem to surface. If your B is mag fired, could be a simple condensor problem causing the misfire or backfire also. I think you're on the right track with ignition inspection.. You'll find it.
Steve/B&B Custom Circuits

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Rich, NJ

06-13-2003 02:31:48

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 Re: My B is burping....HELP! in reply to Farmer in the Dells (WI), 06-12-2003 22:07:50  
I see you're using a multigrade oil which I would not use in these old machines. I'd stick with a "straight" weight oil, Preferably 30wt , or 40 if the pressure's getting low. The multigradestends to slip out past the seals better. The straight weights stay in the engine.
I'd also put some Marvel's Mystery oil in the machine and run it for an hour or two before making the change. This will clean a lot of carbon and sludge out of the rings and what not. Next, With any loss of power, a compression test is in order. Get at least five puffs per cylinder and write it down. Then do it again. I don't know what the compression on an Allis should be , but I'd guess around 80 lbs. If all four cylinder are similiar then go to the next step. Once that is done, Squirt some oil into the cylinder and run the test again. If the numbers come up more than 15 lbs, you have worn rings.
If they only come up 5-10 lbs , then it may be your valves ( assuming the compression is low) If the compression is OK, all cylinder within 10 lbs of each other. Then you might want to look elsewhere beginning with your spark and ignition. Keep us posted Regards, Rich

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Farmer in the Dells (WI)

06-13-2003 04:30:48

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 Re: Re: My B is burping....HELP! in reply to Rich, NJ, 06-13-2003 02:31:48  
Judging from the way this thing cranks, I'd say the compression is fine but I will go back to the straight 40 wt after getting the mystery oil in it today. I also see my exhaust is clean, no smoke or blow by so I assume my rings are ok. This may not indicate 1 cyl giving me a problem though. I will change the plugs too. Stranger things have happened after finding a possible bad plug. I have not noticed any carbon tracking so the wires should be ok too. Might be time to look into a cap. What about the popping through the air cleaner? Could that be caused by a sticking valve?

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06-13-2003 07:59:24

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 Re: Re: Re: My B is burping....HELP! in reply to Farmer in the Dells (WI), 06-13-2003 04:30:48  
Even thought the Compression may seem fine, I'd still do a test on it, Just so you can eliminate any Compression questions and it will give you a good idea of the general condition of the engine. Compression tests are not hard to do and they can reveal a lot. Switching to a 30 or 40 straight weight oil will probably stop your leaking. Use a detergent oil and it should be fine. Contary to what some people think, straight weight oils can also be detergent. The only place, I'll use multiple grade oils is in the automobile. All my engines on any kind of equipment get single grade, straight weight oil. To create a "Burp" out the carburetor, a cylinder must fire while an intake valve is open. Either the Valves are hanging up, burnt, or there is an ignition problem must be decided through a test or you can just start buying and replacing parts as you think might work. This is why I suggested that you do a compression test. This will tell you exactly where you stand. If there is a valve that's just starting to burn, you'll know it with the low compression on that cylinder or what have you. A vacuum test would be even quicker, but there's no vacuum connections on these old tractors. Hopefully it turns out to be something cheap and easy to reapair like a set of points or a cracked distributor cap. Many times it is. The first rule of trouble shooting is to go to the ten cent fuse, not the expensive parts. Sometimes just having water in the carburetor or sediment bowl can make an engine burp . These are good places to begin. Drain the sediment bowl and look for water and crud in the bottom. If there seems to be a lot, drain the carburetor and see what comes out of it. This should eliminate these two problems. I hope I'm not too long winded. Good Luck, Rich

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Farmer in the Dells (WI)

06-13-2003 10:22:56

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 Re: Re: Re: Re: My B is burping....HELP! in reply to Rich,NJ, 06-13-2003 07:59:24  
Not at all. Thanks for your suggestions. I want to nurse it to get my yard cut today then begin to look it over. Otherwise I'll be without it and it is the mower I need for 5 acres around the house. Then I'll have two weeks to take it down if need be.

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