Problems With Johnson 15Hp

Tuesday, 30 July 2024
If the check valve spring is weak, this will help the pumping by not allowing the fuel to bypass and go back into the tank. It has been found on these pre 1977s that by switching to NGK B6HS spark plugs (and in the next higher heat range) the fouled plugs go away and the engine runs better. Bypass cover removed showing pistons & rings thru holes, note top piston evidence of rust/corrosion ON piston||Bypass cover removed showing scored pistons & very likely cylinders also, indicating possible seized or broken rings|. After it has been run enough to warm the block up, check and re-torque the head-bolts. For the most part Gale motors had common but slightly unique powerheads. There are several components to inspect and test when a Johnson outboard motor won't begin to work. Johnson 15 hp outboard won'testart.free. A blown head gasket can lower compression enough to make the motor hard to start or not able to run at low speeds. This could be due to lack of gear oil, but usually it would be because a seal was leaking and water leaked in, then not used for some time, creating rust. On these 2 cycle motors you have to mix the oil with the gasoline to lubricate the internal parts of the motor, so you need to know how much gas you will be needing, add the oil BEFORE you fill the fuel tank so that the oil mixes better than just dumping it in after you fuel up. First thing I would do is to see if the motor is not seized or frozen up in some manner (pull the starter rope). The main motor ran fine off it's tank, but the trolling motor's primer bulb would not even pump up solid. I guess a lesson is to really consider is whether you want to trade/sell to a friend who may not totally understand outboard motor functioning.

Johnson 15 Hp Outboard Won't Start Starter

The purpose is to let fuel in on the intake. C) Check to see if the shifting lever is in neutral, as this activates the neutral safety switch and breaks contact to the starter. The points surface should be free of oxidation, not have corrosion. Johnson 15 hp outboard won't start service. If it is real tight, then possibly the previous owner knew there was a leak somewhere, he was trying to plug it by TIGHTENING this plug. King (Montgomery Wards), AMC Saber, Hiawatha. If the cylinders are scored, it may be best to tear the powerhead down, check the pistons and rings plus the actual condition of the cylinders. I'd figure I'd post some info about some problems I've been having with a 1987 Johnson 15hp tiller, pull start that I got in a trade.

Johnson 15 Hp Outboard Electric Start

One thing to do when taking the head off, would be to mark which coil is the top one (this will be an invaluable help later). How to start a johnson 15 hp outboard. And the drive shaft was rusted so solidly into the pinion gear, that by even placing the shaft in my large lathe, moving the carriage back to where it could apply pressure and someone else beating on the other side with a block with a 4# hammer, nothing would move. These are usually a small hole in the upper RH side of the carb body. And tried the key again. Carburetor Repair; If you do a complete carb rebuild, but after.

How To Start A Johnson 15 Hp Outboard

Ports open first to relieve pressure and get the products of combustion. It is easier if you were running it and it died. If you tip it up farther and twist the throttle, you can experience these teeth to jump out of mesh 1 or 2 gear teeth without knowing what you just did. 15 hp johnson won't start. Too long will hit the top of the piston. Sometimes you may be a bit confused as to the actual manufacturer of older. Throttle as if on a lawn mower. One of my experiences was I had bought a little 2hp Mity -Mite outboard from one of our fishing club's annual yard sales, which came from a widow of a member.

Johnson 15 Hp Outboard Won'testart.Free

This system produces a stronger spark and usually a smoother idle/trolling speed. Has someone else tried to repair it, and is so, why did they do it AND what did they do? One small overlooked item may be the key to getting your motor to function. You may be able to tackle this job without removing the timing plate, if not then the timign plate will have to be removed. If for some reason, they are not opening OR closing completely, you will not have any suction behind the carburetor to pull any fuel in. Electric starter system. This bolt head is buried under the front bracket, which is threaded into the side of this bracket. This should force the #109 gear higher, meshing tighter with #52 gear because they are beveled and eliminate some of your slack. Pour enough in so that you are sure it may be getting to the spline. This pivot screw is indicated by the red arrow. The above paragraph could also apply OR if this water pump driveshaft seal is defective OR worn, you will get the same situation where water will be forced out as indicated above. They mentioned that one COLD morning, they were not able to go out to the hunting grounds because of the non-starting motor and they were on a trip a considerable distance from home. What will happen with more wedging is that you will need to force the lower unit down and the water pump impeller key up THRU the top of the water pump s stainless steel cup AND the plastic housing (or hopefully just ruining the pump's upper seal).

Johnson 15 Hp Outboard Won't Start

33) Bad Crankshaft Bearing Journals: If the motor has been dunked, or abused so that water has entered the block in any way, and not taken care of immediately, you could have a rusted bearing journal on the crankshaft. What could possibly go wrong? This could have been where the wrong parts installed, which many times if a used part (electronic or carburetor) is purchased off eBay, the seller may not really know exactly what he has. 16) Compression: Compression is a health condition of the internal parts of the motor.

Johnson 15 Hp Outboard Won't Start A New

Number one, it has to have a good operating water pump impeller. An example of what can & does happen if the laws of mechanics are not played by||This crankshaft was also ruined but apparently by a weak oil mix|. This will require a carb tear down, as no amount of Power Tune or Sea Foam sprayed into the throat or breather tube will get down into the float bowel or air line passages to even begin to remove any debris that is inside. Some Chinese tanks have a very different vent system. Keep track of your fuel line tie tapes. Check the flywheel nut for tightness, the key not being seated properly to where the flywheel may not be tightened down totally. Pull the upper cowling off. Sometimes initially it may be. If you are using the old metal OMC tank, the cap is vented by the center screw head having slots cut under the head, or through the fuel outlet on the tank when you connect the line coupler as seen in the photo below. These O rings in the fittings can be damaged, leaking causing a vacuum leak up to the motor. At very least the rod may become bent.

Johnson 15 Hp Outboard Won't Start Service

But, I will however 98% guarantee that you will NOT have instant gratification the first time around. The photo on the right is from a magneto ignition, hence the breaker cam at the very lower part of the key. Here is evidence of the broken piston pieces being imbedded into the head||Here the blown piston, missing the top section of the lower LH ring groove. And if the motor was used in salt water, then the bearings could be damaged. Car Quest tester #STL 50850. Most motor manufacturers do not recommend. HOw can you tell if it's running lean or rich? On one motor (again the 1974) I found the wires coming from the points to the coils outside the flywheel area had corrosion, would only allow the test light to come on if the connections were twisted just right during the testing. If the points contacts do not look corroded or pitted, take a piece of business card with some rubbing alcohol or electrical contact cleaner and run it through the points once or twice. IF they get rust/debris or any foreign material under them, the motor will have problems, starting, or running efficiently.

I had spent way more time double and triple checking my repairs, but ultimately my stupidity was the culprit. Here you can see my gravity fuel decarb kit in action|. I had previously gotten a compression test of 50 and 52#. When running the motor under these conditions, if there is water coming out around the shifting rod hole in the lower unit, as shown by arrow below, the following can be the problem.