I took a coven on my head here: the repair of a motoblock was Ural ... I don’t like these motors, like my native Perm ones from the Neva. Any Chinese analogue of the Honda GX is much more reliable, simpler and more maintainable. Well, okay, as they say: run and eat.
And now, in the process of repair, after everything seems to have won, I can’t start the engine either. It puffs once and for all, already the shoulder hurts from twitching. Elephant spark will kill, adjusted. The valves have also been checked and adjusted, the carb has been cleaned. I understand that the matter is in the latter (enough experience). And at first glance, everything is OK. But the third adjusting screw in the channel where the air goes haunted me. There is practically zero information on the Internet, I found the main thing here, that's why I merge the rest here. Maybe someone will come in handy.
Mixing chamber diameter - 25 mm
Diffuser diameter - 20 mm
Throughput of the fuel jet - 150 ml / min
The range of ambient air temperatures at which the engine is started and stable operation is ensured in all operating modes from -20°С to +50°С
Instructions for installation and operation of the carburetor
1. Installation of carburetors on the engine.
Install the carburetor on the engine through the standard gasket and secure with nuts, tightening them evenly to avoid deformation of the flange.
Connect the air filter, speed control rod and fuel hose to the carburetor.
2. Preparing the carburetor to start the engine.
After opening the fuel cock, make sure there is no fuel leakage from the carburetor.
Close the air damper by turning control lever 1 as far as it will go towards the air filter.
Open throttle valve 2 1/8 - 1/4 of full travel.
If the ambient temperature is +5°C or lower, additionally press the float sinker 3 and hold until fuel comes out of the drain hole.
After starting, slightly open the air damper to an angle at which stable operation of the engine is ensured in the warm-up mode, and then open it completely.
3. Carburetor adjustment on the engine.
The carburetors are pre-adjusted at the factory.
Adjustment of the carburetor should be made in case of violation of performance indicators: difficult engine start, unstable idling, high fuel consumption, unstable engine operation under load.
Before starting to adjust the carburetor, it is necessary to check the technical condition of the engine. The quality control of the carburetor adjustment should be carried out on a warm engine.
Carburettor adjustment after repair (dismantling) is carried out as follows:
- quality screw 4, before starting the engine, unscrew by 1.5 - 2 turns from fully screwed
- with the engine running warm, set the stop screw 5 to the minimum stable idle speed.
- slowly unscrewing or tightening the quality screw 4, achieve the maximum increase in speed.
- reduce the engine speed again by unscrewing the stop screw 5.
- set the engine to idle on the governor.
The quality of adjustment is checked by "opening - closing" the throttle valve: if the engine stalls when the throttle is closed abruptly, it is necessary to lean the mixture by unscrewing the quality screw 4 by 1/8 -1/4 of a turn; if the engine stalls when the throttle is opened, it is necessary to enrich the mixture by turning screw 4 by 1/8 - 1/4 of a turn.
4. Special instructions for use.
Operation is not allowed with fuel leakage.
The carburetor must be operated with a hermetically sealed air filter.
The fuel entering the carburetor must be free of mechanical impurities.
Carburetor parts must be flushed with fuel only.
Solvent flushing is not permitted to avoid damage to the flex washer and rubber o-rings.
After rinsing, blow with compressed air or dry.
Cleaning of calibrated holes with metal objects (wire, needles, etc.) is not allowed.
When installing the carburetor on the engine and when assembling it after cleaning and flushing, fasteners must be tightened evenly to avoid bending and deformation of the flanges.
The float chamber must be hermetically connected to the housing.
The tightening force must not exceed the value required to fully compress the lock spring washer.
5. Maintenance of the carburetor after long breaks in operation.
- Remove the carburetor from the engine, clean the outer surface with a hair brush or brush using fuel.
- Disconnect the float chamber 6 and the fuel supply fitting 7, wash the fuel filter 8 and the disconnected parts in clean fuel.
- Blow out with compressed air and dry parts.
- Assemble the carburetor and install on the engine.
K45M3 carburetors are designed for installation on small-capacity single-cylinder and two-cylinder stationary four-stroke engines UD15/UD25 and SK6/SK12.
2. Technical data
2.1. The technical data of the carburetor are given in the table.
| Options | K45M3 | |
| 1 | Diffuser diameter, mm | 22 |
| 2 | Mixing chamber diameter, mm | 25 |
| 3 | Throughput of the main fuel jet, cm 3 / min | 200 |
| 4 | Diameter of the air supply hole to the main system, mm | 3 |
| 5 | Hole sizes in the main system atomizer: - bottom row - middle row - top row |
4 holes ´0.7 4 holes ´0.7 4 holes ´0.6 |
| 6 | Idle jet diameter, mm | 0,55 |
| 7 | Via dimensions – length, mm – width (at the damper), mm – rear wall width, mm - distance of the beginning of the gap from the front edge of the throttle valve, mm |
2,6 0,7 0,5 0,2–0,3 |
| 8 | Balancing nozzle hole diameter, mm | 3 |
| 9 | Fuel level in the float chamber, mm | 11±1.5 |
| 10 | Weight, kg no more | 0,75 |
3. Composition of the product
3.1. K45M type carburetors are single diffuser with a horizontal mixture flow, with a centrally located float chamber and an L-shaped air nozzle that can be oriented in four directions.
3.2. Carburetor type K45M has a body 1, in which are laid: channels of the idle system 20, channels of the main system, where the atomizer 10 is inserted and air is supplied 13, channels of the high-altitude corrector 33, channels for supplying fuel to the needle of the fuel valve. The carburetor has a centrally located float chamber 2 and an air pipe 3 with an air damper 26 built into it.
To start the engine at negative temperatures, a float sink 9 is provided in the carburetor.
The butterfly valve 25 is of the butterfly type, the throttle valve axis 31 is vertical, the lever 16 of the kinematic connection with the engine speed controller is attached to the axis.
4. The device and operation of the carburetor
Fuel enters the carburetor through the fuel inlet fitting 4, is filtered by the mesh 34.
A constant fuel level in the float chamber 2 is maintained by the float 5 connected through the lever 8 with the needle of the fuel valve 6 . The centrally located float chamber allows you to have a stable fuel level in the main system during rolls and trims.
The idling system is made with sequential, after the main jet 11, the supply of fuel through the intake tube 19 to the idle fuel jet 18.
The idling system consists of channels 20, an air quality screw of the idle system 22, a fuel jet 18, a slot 21, an idle emulsion quality screw 23, an idle throttle opening adjustment screw 24.
Screw 22 regulates the operation of the carburetor when the engine is running in transient modes from idle to load and vice versa. Screw 22 is adjusted and sealed in the service center of ChSUP "Motoblock-master". With screws 23 and 24, the consumer regulates the operation of the engine at idle.
The main fuel system is made with an atomizer 10 of the emulsifying type, to which the fuel enters through the main fuel jet 11 and is emulsified by the air supplied through the air channel 13.
Butterfly type butterfly valve 25 is attached to the horizontal axis 31 . A lever is attached to the axle 16, which is connected by a rod to the engine speed controller.
For manual control of the throttle opening, a leash 17 is attached to the carburetor body, loaded with a friction moment from lock washers 32.
The branch pipe of the air carburetor 3 is L-shaped. The nozzle neck is oriented towards the filter. The air damper 26 of the starting device is located in the pipe. The air damper axle 30 is driven manually using the lever 27 . In the closed position, the axis of the air damper is loaded with a calibrated moment from the spring 29. At the initial moment of starting the engine, the air damper overcomes the force of the spring and opens slightly, this contributes to the fastest engine start.
In the engine warm-up mode, the air damper is constantly ajar, which contributes to a better warm-up of the engine.
For carburetors, a choke lever with a place for connecting to a remote control is provided.
The carburetor has a high-altitude corrector, consisting of a channel 33 and a correction screw 14. In order to reduce fuel consumption through the main system, i.e. for the purpose of correction, the screw 14 is smoothly turned away, achieving the required degree of "depletion".
In carburetors, a scheme is used with balancing the float chamber 2 through fitting 15 and channel 37 with the engine air filter.
With this scheme of balancing the float chamber, the carburetor is not very critical to clogging the air filter.
5. The order of installation of the carburetor on the engine
5.1. Install and secure the carburetor to the engine flange.
5.2. Attach to the carburetor an air filter, a fuel supply pipe, an interconnection rod connecting the speed controller with the throttle lead lever; install the float chamber balance tube.
6. The procedure for preparing the carburetor for starting the engine and warming up
6.1. Completely close the air damper 26, for which: position the air damper control lever 27 along the axis of the carburetor body.
6.2. Set the leash 17 of the throttle valve manual drive to the optimal position for starting (1/4 opening from the full throttle travel).
6.3. Fill the float chamber with fuel (manually supply fuel with the fuel pump), with the drowner 9 pressed, until fuel appears in the transparent balancing tube.
6.4. Start the engine, from the moment the engine starts to work steadily, gradually move the air damper to the open position.
6.5. Warm up the engine to the regulated temperature.
7. Carburetor adjustment on the engine
7.1. Make sure that the engine is warmed up to the regulated temperature.
7.2. Check the optimal position of the idle air quality screw 22 . Check by turning the screw “to the left”, “to the right” by about 1/3 of a turn, achieving maximum stability of the speed when the engine is idling on the regulator.
Perform an additional check when turning on and off the full load with a notch of the frequency deviation.
7.3. Adjust the carburetor at idle, for which bring the leash 16 to the idle position. Use the idle speed screw 24 to ensure the minimum stable engine speed, then turn the quality screw 23 to achieve the maximum increase in engine speed. Reduce the engine speed with the screw 24 to the regulated ones.
7.4. Check the operation of the carburetor in all operating modes (if necessary, repeat the adjustments in paragraphs 2, 3).
7.5. Put a plug or paint over the screw 22 .
Note: adjustments and work on points 2–5 are carried out at the service center of the ChSUP “Motoblock-master”.
8. Special instructions for use
8.1. The carburetor must be operated with a hermetically sealed air filter. Sucking of raw air into the carburetor is not allowed.
8.2. The fuel entering the carburetor must be free of mechanical impurities.
8.3. When installing the carburetor on the engine and when assembling it after cleaning and flushing, the fixing nuts, bolts and screws must be tightened evenly to avoid bending and warping of the flanges. The float chamber must be hermetically connected to the housing.
8.4. Carburetor parts must be flushed with fuel only. Washing the carburetor with solvents to avoid dissolving parts from SKU-6 and rubber rings on the screws is not allowed.
8.5. The carburetor and its parts after washing should be blown with compressed air or dried. It is not allowed to wipe parts with wiping ends.
8.6. Cleaning of calibrated holes with metal objects (wire, needles, etc.) is strictly prohibited.
8.7. Check the fuel level with a ruler with the plug 35 removed and the fitting with a transparent tube having an inner diameter of at least 6 mm attached. The fuel level is adjusted by bending the lever 8 .
The internal combustion engine DM-1K of domestic production is designed for multi-purpose use (for installation on motor blocks, motor cultivators; mini tractors; small-sized vessels; woodworking machines; pumping, feed crushing plants).
The engine is comfortable and easy to operate. Working with the engine does not require special training of the operator. To control, regulate (adjust) engine systems, perform maintenance and current repairs, no special measuring instruments, testing and other equipment, tools and devices are required.
Producer of the engine DM-1K OAO Neva (Red October). This Russian-made engine in various modifications was installed on Neva walk-behind tractors.
The service life of your engine will increase significantly if you strictly follow all the rules of operation, maintenance and storage specified in the engine user manual for a walk-behind tractor:
Valves and tappets Crankshafts and connecting rods Pistons, rings, brackets Gaskets and seals Spark plugs Starters and starting ropes"); ) BX.ajax.UpdateWindowTitle(arAjaxPageData.WINDOW_TITLE || arAjaxPageData.TITLE); if (arAjaxPageData.NAV_CHAIN) BX.ajax.UpdatePageNavChain(arAjaxPageData.NAV_CHAIN); )); (function (w, d, nv, ls) ( var lwait = function (w, on, trf, dly, ma, orf, osf) (var pfx = "ctawait", sfx = "_completed";if (!w) (var ci = clearInterval, si = setInterval, st = setTimeout , cmld = function() (if (!w) ( w = true;if ((w && (w.timer))) ( ci(w.timer);w = null;)orf(w);)); if (!w || !osf) (if (trf(w))(cmld();) else (if (!w) (w = (timer: si(function () (if (trf(w) || ma 0 && !!cnt && cnt.get ? cnt.get("clientId") : null;) catch (e) (console.warn("Unable to get clientId, Error: " + e.message);)ct( w, d, "script", clId, n);), function (f) (w[o](function () (f(w[o]);))));) else (ct(w, d , "script", null, n);)); var cid = function () (try (var m1 = d.cookie.match("(?:^|;)\s_ga=([^;])");if (!(m1 && m1.length > 1) ) return null;var m2 = decodeURIComponent(m1).match(/(\d+.\d+)$/);if (!(m2 && m2.length > 1)) return null;return m2) catch (err) ( ))(); if (cid === null && !!w.GoogleAnalyticsObject) ( if (w.GoogleAnalyticsObject == "ga_ckpr") w.ct_ga = "ga"; else w.ct_ga = w.GoogleAnalyticsObject; if (typeof Promise !== "undefined" && Promise.toString().indexOf("") !== -1) ( new Promise(function (resolve) (var db, on = function () (resolve(true)), off = function () (resolve(false)), tryls = function tryls() (try (ls && ls.length ? off() : (ls.x = 1, ls.removeItem("x"), off());) catch ( e) (nv.cookieEnabled ? on() : off();)); w.webkitRequestFileSystem ? webkitRequestFileSystem(0, 0, off, on) : "MozAppearance" in d.documentElement.style ? (db = indexedDB.open( "test"), db.onerror = on, db.onsuccess = off) : /constructor/i.test(w.HTMLElement) ? tryls() : !w.indexedDB && (w.PointerEvent || w.MSPointerEvent) ? on() : off();)).then(function (pm) ( if (pm) (gaid(w, d, w.ct_ga, ct, 2);) else (gaid(w, d, w.ct_ga , ct, 3);)))) else (gaid(w, d, w.ct_ga, ct, 4);) ) else (ct(w, d, "script", cid, 1);))) ( window, document, navigator, localStorage); var jsControl = new JCTitleSearch2(( //"WAIT_IMAGE": "/bitrix/themes/.default/images/wait.gif", "AJAX_PAGE" : "/products/karbyurator_k45_dlya_dvigatelya_dm_1k/", "CONTAINER_ID": "title-search" , "INPUT_ID": "title-search-input", "MIN_QUERY_LEN": 2 )); function jsPriceFormat(_number)( BX. Currency.setCurrencyFormat("RUB", ("CURRENCY":"RUB","LID":"ru","FORMAT_STRING":"#RUB","FULL_NAME":"Ruble","DEC_POINT":"." ,"THOUSANDS_SEP":" ","DECIMALS":"0","THOUSANDS_VARIANT":"S","HIDE_ZERO":"Y","CREATED_BY":"","DATE_CREATE":"2016-12-28 10 :45:07","MODIFIED_BY":"11","TIMESTAMP_X":"2018-09-05 14:51:00")); return BX.Currency.currencyFormat(_number, "RUB", true); ) var arBasketAspro = ("BASKET":,"DELAY":,"SUBSCRIBE":,"NOT_AVAILABLE":,"COMPARE":); $(document).ready(function()( setBasketStatusBtn(); ));Hi all! I have a Ural motoblock. There was a problem with idling. The factory instructions indicate that the adjustment is done with only 2 screws, and I have 3 of them. One screw is located in the middle of the carburetor and is called the idle adjustment screw. But nothing is written about it in the factory instructions. 2 more adjusting screws are located near the throttle. The first limits the closing of the damper to a minimum, the second regulates the cross section of the hole, which is on the side after the damper. The instructions suggest adjusting as follows: turn the idle screw, which is located on the side of the carburetor, completely, and then unscrew it 2.5 turns. It is completely incomprehensible: on the side - which one is it? If there was a sectional drawing in the instructions, the attacks are incomprehensible.
Fuel composition adjustment screw Idle mixture by mistake, apparently, was unscrewed. I screwed it in. Then the engine began to go haywire. In short, I decided to leave this carburetor for spare parts, bought a new one - the problem remained!
In short, I want to understand how this carburetor generally works. If on x.x. The speed control does not work, and the spring is not tensioned, through which it should work. It turns out that the throttle must remain closed and the screw that limits it to min. closing, rest against the carburetor body. And my damper, on the contrary, opens more strongly, and the screw, it turns out, does not work at all. As a result, it goes to waste.
