Home heat oil stove
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=209488
Printed Date: 01 Apr 2026 at 4:59pm
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Topic: Home heat oil stove
Posted By: SteveM C/IL
Subject: Home heat oil stove
Date Posted: 26 Dec 2025 at 11:19am
| I've got an old Monogram oil stove that was used for home heating. Has a reastat run fan built in to oil flow control. Just lately has started to lose fan speed after an hour or so running. Visual inspection of reastat and electronic spray cleaning hasn't changed anything. Fan spins freely and have oiled it to boot. Is it the fan motor dieing or reastat failing? Have owned it 50 yrs. I suppose a voltage check out of reastat is what i need as it just starts slowing down. Shut it down for a while and it works again. Don't know what to do. Used to heat my shop. Any ideas? TIA that fan has alot of hours on it. How would a pro diagnose it? |
Replies:
Posted By: steve(ill)
Date Posted: 26 Dec 2025 at 1:06pm
|
i would bypass the thermostat.. Run power straight to the fan and let it run wide open all day long... Would be a good test to determine if the motor has a problem... Old windings could be breaking down when hot, or bearing could be expanding with heat and causing a little drag... ------------- Like them all, but love the "B"s. |
Posted By: SteveM C/IL
Date Posted: 26 Dec 2025 at 1:38pm
| Yeah i wonder if it has brushes. Need to try your suggestion first before tearing into. I don't understand why stuff don't last forever...... |
Posted By: Lars(wi)
Date Posted: 26 Dec 2025 at 6:12pm
|
Are you using ‘electric motor oil’? ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: SteveM C/IL
Date Posted: 26 Dec 2025 at 6:32pm
| It is "3 in 1" oil. Isn't that correct? |
Posted By: Lars(wi)
Date Posted: 26 Dec 2025 at 7:04pm
|
3 IN 1 is good for door hinges, bicycle chains, etc. There is specialized oil, for electric motor bearings. I do believe the makers of 3 IN 1 do market a specialized grade of lubricant oil, with ‘For Electric Motors’ printed in bold lettering on the front of their little cans. ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: Walker
Date Posted: 26 Dec 2025 at 9:10pm
| Go to a Hobby Shop and get some of the stuff they use on model RC airplanes and car motors. It made me a believer on a grandfathers clock works that refused to run on 3 in 1 oil. More reastats that came to me ailing needed to be cleaned or replaced, more than oiled. |
Posted By: SteveM C/IL
Date Posted: 26 Dec 2025 at 11:05pm
| I washed down the reastat coil with electrical contact cleaner. Didn't oil it. |
Posted By: DMiller
Date Posted: 27 Dec 2025 at 4:13am
| Main issue is time on rheostats. Moisture and/or damp air to being close to the higher heat of a machine or furnace having ill effects on moisture delivers really foul corrosion or in air mineral buildup. At the nuke on a number of the oldest systems we actually had instructions to periodically ‘Wipe’ the system rheostats to burnish the buildup of corrosion or mineral deposits off. |
Posted By: SteveM C/IL
Date Posted: 27 Dec 2025 at 2:41pm
| IR gun says 150 deg middle of motor housing after 25 min run time. I would think that is bad. Little ole motor has Little load on it. Heat off just fan running. |
Posted By: DMiller
Date Posted: 27 Dec 2025 at 3:59pm
| 90, maybe 100F, chances are has lost winding varnish integrity. |
Posted By: SteveM C/IL
Date Posted: 27 Dec 2025 at 7:54pm
| I'm going to see if i can find a replacement. Have good picture of tag on phone. |
Posted By: SteveM C/IL
Date Posted: 27 Dec 2025 at 11:46pm
| Not alot of success finding motor. 1475 rpm 115V .35amp continues duty 60CY,protector 67A45. I'm not much for electronics. Can you use a rheastat on any single speed motor to trim it down on rpm without harming motor? Does it require a "special" kind of motor? |
Posted By: Coke-in-MN
Date Posted: 28 Dec 2025 at 12:11am
|
https://www.amazon.com/shop-fan-motor/s?k=shop+fan+motor%20" rel="nofollow - https://www.amazon.com/shop-fan-motor/s?k=shop+fan+motor
https://www.grainger.com/category/motors/ac-motors/hvac-ac-motors" rel="nofollow - https://www.grainger.com/category/motors/ac-motors/hvac-ac-motors ------------- Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel. |
Posted By: steve(ill)
Date Posted: 28 Dec 2025 at 9:41am
|
buy a cheap motor like Coke posted, that will fit in the hole... Dump the rheostat and just run a constant speed motor with an on- off switch. justs run power direct to the PRESENT MOTOR and run it constant... see how that works for a TEST.... 150 degree on the windings is acceptable, if it stays in that range... but anyway would be a good test to see how constant "ON" works. another option is to use a fan / motor running at constant speed and use a rheostat to control a damper that restricts air flow.... think of the old CHOKE on a car engine, that warmed kup a spring with temp and OPENED the choke plate... no motor involved
------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 28 Dec 2025 at 9:49am
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there are some motors like a variable speed hand drill that work OK.. But MOST MOTORS do not like the drop in voltage from a rehostat.. Thats why NEW SYSTEMS us a Variable Frequency Drive unit.. You keep the VOLTAGE up to keep the POWER running thru the motor.. and you reduce the FREQUENCE to drop motor speed.. YES.. running dropped voltage on a standard motor is a good way to burn it up. ------------- Like them all, but love the "B"s. |
Posted By: SteveM C/IL
Date Posted: 28 Dec 2025 at 12:03pm
| Got better pics and some info I posted was wrong. Ask a member to post them for me. |
Posted By: Coke-in-MN
Date Posted: 28 Dec 2025 at 2:38pm
|
You can buy a Box Fan with a variable speed motor for less that $25 and could use that motor for your present fan blade . Seems a lot of the older oil space heaters just relied on radiant heat and air flow from cool to warm to create movement . ------------- Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel. |
Posted By: SteveM C/IL
Date Posted: 28 Dec 2025 at 6:23pm
| Wired up motor only. Ran full speed for about 50min then started slowing down. It kept dropping rpm and at about an hour run time it just died. temp was 180. Took it apart. Brushless. No sign of touching fields. Has a little fan on shaft end internally. It spun freely on motor shaft. Got things pressed apart to get to little fan mounting sleeve and applied red loctite. Will reassemble and try again. Find it hard to believe the loose internal fan is the problem. Will see. Otherwise a small pedestal fan on floor behind stove might do the trick. |
Posted By: AC7060IL
Date Posted: 28 Dec 2025 at 6:45pm
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Posted By: SteveM C/IL
Date Posted: 28 Dec 2025 at 6:52pm
| Thank you 7060 for posting my pics. |
Posted By: Walker
Date Posted: 28 Dec 2025 at 7:07pm
| I bought a do dad at Harbor Freight for under 10 bucks to make an old constant speed router variable. Can't pull what it was called into memory right now, though. It would do its thing on some motors, but not others. Seems to me, it depended on how the motor was wound. I do remember it was a long story how it worked, just plugged in between motor and receptacle. Was the Cat's meow on an old Porter Cable, not so much on a Sears. |
Posted By: steve(ill)
Date Posted: 28 Dec 2025 at 8:50pm
|
long run... a small fan setting in the back is cheap and effective... let it run constant.. ------------- Like them all, but love the "B"s. |
Posted By: SteveM C/IL
Date Posted: 28 Dec 2025 at 10:42pm
| Put back together like before...direct wired...ran hour and 10 min when unplugged. Never faded. Temp at center of fan motor was 142 deg VS 180. Time to wire back original and see what happens. The small floor fan still an option. Thanks all. |
Posted By: DMiller
Date Posted: 29 Dec 2025 at 5:45am
| Looking at picks, forced draft burner fan, had similar in Grandma’s house on coal burner converted to Gas. They defeated it for NG as was not needed as would have been for Oil or Coal. And Yes that little motor winding fan spinning on the shaft would be a major problem, as much as a Alternator fan is as needed. Has to pull air across windings where big fan pulls air around entire motor. |
Posted By: AC7060IL
Date Posted: 29 Dec 2025 at 7:37am
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SteveM C/IL wrote: