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Swen Nilsson 
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Joined: 20 Oct 2013
Location: Minnesota
Points: 16
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 Topic: B oil issue
Posted: 10 May 2017 at 2:58pm |
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I have an AC B that I use to mow grass with. It seems to get kind of hot after some use, then stops, and will not start again until it cools down. There is plenty of water in the radiator, and plenty of oil. The oil gauge shows good oil pressure when it is running, HOWEVER, I have noticed that the oil filter (a screw-on type) does not seem to get warm even though the engine is hot. I am therefore wondering if the oil is circulating through the filter. Has anyone else had an issue like this?
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DougS
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Joined: 03 Nov 2011
Location: Iowa
Points: 2490
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Posted: 10 May 2017 at 3:46pm |
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I'd take the valve cover off and see if there is oil flow to the valve train. If not, unscrew the oil filter and see if oil spurts from the tube. You may have a problem due to siezing because of overheating for one reason or the other. You may have a clogged oil line. Good oil pressure does not mean you have good oil flow.
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 10 May 2017 at 3:49pm |
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Remove the filter. There should be a metal stem that goes up the center the whole length of the filter. Without this stem, oil doesn't circulate through the filter. As far as the stops running when hot, next time it does it pull a plug wire off and hold it 1/2" away from the engine and crank it. It should give a dark blue spark. If no spark or a yellowish spark, it may be time for a tune up. New points, condenser, plugs, wires, cap and rotor.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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HD6GTOM
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Joined: 30 Nov 2009
Location: MADISON CO IA
Points: 6627
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Posted: 10 May 2017 at 4:10pm |
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this is one of the signs of a coil going bad. does it have a mag or distribuator? Coil gets hot and brakes down inside, spark goes away till coil cools off. dad used to poor cold water on the coil of the old f250 flathead, by doing that we would usually get home.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 89289
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Posted: 10 May 2017 at 4:15pm |
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the oil filter does basically nothing... filters 15% BYPASS oil... not part of the lube system........... hot and stalling is due to coil in the magneto or coil for the distributor... change the condenser also. As TOM said, I have poured a gallon of cold water over the mag and 5 minutes later it will start back up.
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Like them all, but love the "B"s.
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 10 May 2017 at 4:43pm |
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Dying while working, and having to cool down to run again has at least three causes.
The most classic is the ignition coil overheating and developing a shorted turn that is cured by cooling. The condenser can develop a short and cure it after cooling, but most often a bad condenser doesn't recover in my experience. Either is tested by the test suggested by Brian.
One other is fuel starvation because the gas tank cap that is usually the gas tank vent is not venting and after a while the vacuum in the tank from taking fuel gets strong enough to stop fuel flow. Given the time taken to cool the tractor the vacuum can leak enough to let the tractor run for a while again. The first test is when the tractor stops, loosen the cap. If there's enough vacuum to stop the fuel flow you will hear the air going into the tank as you loosen the cap. Then with the cap very loose or off, the tractor will start again quickly without waiting for the cooling time period.
Gerald J.
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NICKMI
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Joined: 15 Sep 2009
Location: Greenville
Points: 534
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Posted: 10 May 2017 at 4:49pm |
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Needs new coil
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Swen Nilsson
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Joined: 20 Oct 2013
Location: Minnesota
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Posted: 10 May 2017 at 5:51pm |
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My B has a mag.
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Swen Nilsson
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Joined: 20 Oct 2013
Location: Minnesota
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Posted: 10 May 2017 at 5:53pm |
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And thanks for all the GREAT responses!
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Ted in NE-OH
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Joined: 12 Nov 2009
Location: Austinburg OH
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Posted: 10 May 2017 at 8:39pm |
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I had that problem for me and when I ran the B hard it would quit, turned out to be a fuel restriction. I only thought it was overheating but it wasn't
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CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 10 May 2017 at 9:08pm |
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Engines running lean have a hot exhaust. SOP with aircraft engines when leaning the mixture at cruising altitude for economy after running rich for maximum power for take off is to look at the exhaust gas temperature and raise it some 500 degrees F.
Gerald J.
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