two stroke engine leaking crank seal symptoms

Then it starts all over. If you had bad crank seals, the motor would puff LOTS of white smoke when it runs. A typical sign indicating you need to replace a two-stroke crank seal is an oiled plug or oil dripping from the exhaust pipe. A 2-stroke engine requires a properly sealed block to run right because it uses the crankcase vacuum created from the rising piston to pull the incoming charge into the crankcase; the downward stroke of the piston pressurizes the charge, pushing it into the intake ports and up to the combustion chamber. IT was, & still is a head scratcher. Typical problems include hard starting, rough running, a need to adjust the carburetor during use to keep the engine from stalling, a need to rev the engine to keep it from dying, and not starting at all. thanks. Honda . For a better experience, please enable JavaScript in your browser before proceeding. Lousy idle, screams at top end, plugs show lean after screaming at top end. So that's out of the picture. If the fuel pump diaphram goes it usually causes fuel to fill the crank through the impulse line. Even though the screws which fastened the valve body to the engine had been tightened correctly, the valve body face and the crankcase face were not quite flat. It blew up on the way home. Use a new gasket when refitting the clutch cover. Making sure that the fuel tank filter is clear with no blockages that can restrict the … Wooohooo i added something of value before 8am. I have tried spraying the pto seal with no luck,have not checked the mag side though. The top diaphragm on the fuel pump had a small crack in it,so it was sucking fuel through the impulse line into the crankcase as mentioned earlier. Joined May 14, 2005 Messages 2,028 Location uk. This happens because the bad seals let transmission oil into the crankcase and it gets burned with the other gas. Come join the discussion about performance, racing, troubleshooting, trails, maintenance, riding tips, modifications, classifieds, gear, and more! If the crank seal goes it will cause a lean condition on that side. For a better experience, please enable JavaScript in your browser before proceeding. The crankshaft seal is mounted behind the engine’s main crankshaft pulley, so servicing it requires the removal of the belts and crankshaft … I know that the upper crank seal is bad and have one on the way, just trying to figure out if my symptoms point to this or something else. I see lower crank seals leaking by quit often in all brands of 2 cycle outboards. On a rotary valve engine an inner crank seal failure will result in a complaint of high injector oil consumption and excessive smoke during operation. The "leaker" engine didn't smoke at all. A leaking two-stroke crank seal can result in a lean idle, a flat spot at low revs or an engine that will not rev out. interesting. I believe on the 400 that the impulse runs off of the pto side. The boat had been sitting for two seasons after the previous owner brought it out of storage in the spring of 2013 only to find that the starboard engine was seized up. Sep 26, 2012. Hmmm. I believe this may be what I am dealing with. Symptoms include: over reving, overheating, stalling on acceleration, failure to idle, and worst of all, an engine seizure if the problem is neglected. half way between those two spots is where you want it. more common problems encountered. Symptom: Possible causes and corrections: No Engine Start #1. A good fuel additive will enhance correction to fuel break down for up to 2 years. If the fuel pump diaphram goes it usually causes fuel to fill the crank through the impulse line. cause for each problem listed. Good write up. I’m about to do this to my DT400 and my DT1 250. replacing crank seals are a must on the old 2Ts, Thats been the number 1 failure I’ve had on any of my old bikes. The RD LC Crazy UK 2 Stroke Forum . Hey there - interested to hear about any updates you may have on this. Also check out the spark plug troubleshooting guide from the good folks at NGK. Any other 2 stroke's. When I brought the boat back home to winterize & check things, I truly thought it was going to be full of oil again. A forum community dedicated to snowmobile owners and enthusiasts. If the seal on this side goes bad, you’ll get air leaks. Well it had the wrong oil in so maybe TCW3 oil seeps through the seals easier than the proper sea-doo oil does. A leak down test will pinpoint exactly where the two-stroke engine is leaking. I swapped out the carbs as well as trying a different CDI I had and the symptoms never changed. The main difference (from a basic repair standpoint) is the carburetor setup. To check the pump verify that the impules fitting on the pump will hold pressure (4-6psi) indefinitely. A 2-stroke engine requires a properly sealed block to run right because it uses the crankcase vacuum created from the rising piston to pull the incoming charge into the crankcase; the downward stroke of the piston pressurizes the charge, pushing it into … Don't forget some soapy leak finder and spin the crank a few times while the tester is on for the full test. After the winter storage the seal/s did leak quite a bit in the starboard engine. A gas leak detection fluid was applied to the area where the valve contacted the engine. High output engines that have significant air leaks will usually run fine so long as the rpms are kept low. Im losing the oil and it is not leaking. So he towed the boat back home unrepaired and it sat there until I purchased it & brought it home this past spring. This is interesting because It didn't leak a drop after more than three months of storage last summer. Somebody commented that because one was really black one was quite like clean that that's actually good sign that seals working because they'd be much, much more even if it … Oil leaks are the most common symptom of a problem with the crankshaft seal. Air leaks are, by far, the number one cause of vintage engine piston seizures. A crankcase air leak is a problem many pro saw engines have at some point in their life. On a 2-stroke the crancase is a part of the air/fuel mix flow's way to the combustion chamber. Discussion Starter • #1 • Jan 22, 2008. and cause it to not take in the proper amount of fuel? I read another post saying to remove the guts out of an old plug and solder a schrader valve in it. For Sale 50, 80 & 125cc Bikes or parts. Unless I'm mistaken, while idling, spray carb cleaner on the crank seal (only works for the PTO seal since the MAG can't be reached). ITs as if it went to a junk engine, to being in better shape than the "good" engine. Curing 2-cycle Engine Problems: Many 2-cycle engines have problems and are sent to the junk yard before their time. You can do the mag side also, just spray in the recoil hole and thats how i was told to, buy a person i trust with my sleds motor. This causes hard starts and engine rattle as well as loss of power and engine damage. It's an introduction to small engines and covers many of the things that apply to 2-stroke engines (which will be covered on this page). A crankcase air leak is a problem many pro saw engines have at some point in their life. Technical Info, Carburation/Jetting looms etc. If one is bad will it make the fuel pump not work? Nov … After all, I didn't change any parts or find the smoking gun. The problem transitioning to full throttle can also be due to something else, leaking crank seals being one thing that causes erratic performance like that. It also seems to run good at 3/4 to WOT throttle. & that one was not the problem. DO. So actually, IMO you may be on to something. It gets into the single digits & below here in the winter & just maybe the cold temps are causing the seals to shrink just enough to leak. All I can really think of is that it needs a fuel pump or a crank seal,wanted to see if anyone else has had these issues or can help narrow it down. Re: seadoo enigine full of 2 stroke oil after sitting. An air leak in your crankcase will cause a lean fuel mixture which in turn can lead to a fast or erratic idle speed. JavaScript is disabled. Check spark plug; Replace if black and worn electrode is found. Fouled plug says you are getting too much fuel. Misdiagnosis often causes unnecessary service costs and part replacement. How exactly does a two-stroke leak d. BLOG BOOKS VIDEO MANUALS FREEBIES ABOUT STORE HOW TO PERFORM A DIY LEAK DOWN TEST ON A TWO STROKE. In addition to all these problems, if the seal on the Power-Take-Off side (Clutch side) is leaking, transmission oil can get into the engine causing lots of smoke while running. RV cavity held up in the pressure test so there is really no other way the engine can fill unless when you pressure tested it you moved a seal a little bit, but either way if it never fills again money saved and you gain a good deal on a boat. and cause it to not take in the proper amount of fuel? LC / YPVS & 500 Chat . This leads to blown seals and gaskets, causing oil leaks. Apr 10, 2018. Cracked and leaking lines will give the same symptoms as a bad crank seal. If your 2 stroke engine has a very fast idle or erratic idle it could be due to an air leak. Crank seals in two strokes can wear and start to leak, creating problems. Italian & Others. Typical problems include hard starting, rough running, a need to adjust the carburetor during use to keep the engine from stalling, a need to rev the engine to keep… Sometimes it will run for a couple minutes but idles up to 3000rpm then down to 1700 then back up to 3000. I figured if it was easy to replace the seal, I'd just do it. 98' cr500. If you had bad crank seals, the motor would puff LOTS of white smoke when it runs. Crankcase-compression. A leak down test will pinpoint exactly where the two-stroke engine is leaking. anytime i need to keep on the gas. R. raczekp1 Lieutenant. crankshaft seals have a limited service life and whilst a worn seal will not always show any visible sign of leakage, the effect of a worn seal/s is critical to the performance of a 2-stroke motorcycle. I have been searching the this forum and found several post discussing the symptoms of a bad crank seal. A small "air leak" at a crank seal or an intake gasket will cause the usually perfect fuel/air mixture in the crankcase to become slightly lean...sometimes very lean. 5 years ago. Then amazingly, it just seemed to stop. It sure seems to be a fuel related problem. This makes the two-stroke engine ideal for use in chain saws, garden trimmers, etc. The BEST sign that your seals are gone is failure of a leakdown test. Im losing the oil and it is not leaking. Thinking it was the starter, he brought the boat into his service center only to have them inform him that the engine was hydro locked with injection oil. You are using an out of date browser. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. If a crank seal is leaking it can allow gearbox oil to enter the crankcase and causes the bike to run rich. 98' cr500. This accounts for why many freshly assembled engines operate well during the break in period, but seize the first time the throttle is hung wide open. oil feed how it works? 2001 sea Doo 240 islander Will not turn over. 4. Just the typical 2-stroke start up amount. Thanks. The "leaker" engine didn't smoke at all. Joined Mar 30, 2010 Messages 1,295. I know its a two stroke, cause of the 32:1 comment. When the crankcase on the two cycle is leaking it will cause performance problems and eventually destroy the engine. ITs as if it went to a junk engine, to being in better shape than the "good" engine. Located on either end of the crankshaft, their task on one side is to provide a seal between the gearbox and crankcase and on the other side a seal between the atmosphere and the crankcase. If the crankshaft seal dries out, cracks, or breaks, it can cause an oil leak. It is imperative that these symtoms are investigated as the result of running an engine lean can be disarstrous. Curious, considering the crank seals were leaking profusely a short while ago. A sealed crankcase is essential for two-stroke operation, especially at … A typical two-stroke engine will have seals on both sides of the crankshaft but here we are replacing the right-hand-side one located behind the clutch. I will put a new pump on and see what happens. The Outcasts Diesel Den. The two-stroke engine configuration has a few advantages, however, that make it indispensable for some applications. Two-Stroke Motorcycle Troubleshooting Guide. No, I haven't done a leakdown, and I suppose I should. Crank seal . Two-stroke engines have a much higher power-to-weight ratio than other engines and they can be operated in any position without problems. In the second photo I submerged the whole cavity to show how bad it leaked. Many two-stroke engines use a crankcase-compression design, where a partial vacuum draws the fuel/air mixture into the engine as the piston moves upwards. Fouled plug says you are getting too much fuel. I thought I would share something with you guys that I found very interesting. If the seal is leaking oil can escape, but you will not see it where you say oil is leaking now and more of a problem will be water will entert he powerhead thru the lower C/S seal and the first you will mostly likely know about it is the engine will seize. After using a outboard motor, unplug the gas line and run the motor until it quits. The Theory of Air-leaks. both engines hold pressure for 24 hours with little loss. Overview: There are quite a few differences in the operation of 2-stroke engines compared to 4-stroke engines (which were covered on the Basic Small Engine Repair page). But I am sensing from the first reply that it ain't such a easy replacement. Stator side crank seals, leaking base gaskets, or intake manifold gaskets are all examples of seals that will result in air leaks which can lean out the air fuel ratio. If no start go to step #3. Why would these seals need replacing? I had that same problem on … bad crank seals make it hard to start a warm engine without choking it. Figuring that if the seals were really that terrible I would likely go through a ton of oil while running, I resigned to the fact that I was going to have a rebuild in my near future. Air/fuel is then sucked into the crankcase. Source(s): Me. I don't think I have ever seen a leak from the center seams of the crankcase. I used soapy water. BlueDevil Pro says: May 13, 2016 at 3:36 pm. The drainplugs side has very small bubbles but its not leaking if any of the seal, i have a! It is imperative that these symtoms are investigated as the level drops not... Mean the engine to determine whether this is not leaking on a engine! Lean mixture can quickly result in a seized piston will run lean and trying to tune will. He towed the boat back home unrepaired and it gets burned with the crankcase and causes the bike will lean. Schrader valve in it mixture can quickly result in a seized piston four cycle is leaking it allow! Best way to figure out if you two-stroke Dirt bike engine has a few advantages however... Spraying stuff at the crank seals in two strokes can wear and start to leak, creating problems not in. Is nothing making the oil pump it just sits stagnant crankshaft seal out! Runs out of an old plug and solder a schrader valve in it line during extended.. Causes fuel to fill the crank seals leaking by quit often in brands! Making the oil and it is not leaking the single most important to. 42 responses to “ replace Yamaha 2 stroke oil after sitting turn can lead to a fast or erratic speed... Imo you may be on to something a tone of oil inside the hood or some oil the., etc it and would like some opinions on the two halves of the pto side mhawk said crank. That side of being finicky machines partial vacuum draws the fuel/air mixture the! 2-Stroke the crancase is a problem many pro saw engines have a storied history of being machines... I was right about using a outboard motor, unplug the gas line and the. Experience, please enable JavaScript in your browser before proceeding and trying to it. I submerged the whole cavity to show how bad it leaked find the smoking gun check valve that lets in. The point of leak-down testing my scooter engine dripping from the good folks at NGK replace black! Without problems unless you know what to look for bad upper seal, etc done leakdown. Trimmers, etc 50, 80 & 125cc Bikes or parts a is... Are all the signs of a leakdown, and i suppose i should i. Without choking it crank seals ” Carson says: 09/18/2014 at 8:26 am figured! I will put a new gasket when refitting the clutch side crank seal is oiled... Four stroke 800 ’ s the point of leak-down testing my scooter engine and see happens. That lets air in as the result of running an engine lean be... Observed, a leak down test will pinpoint exactly where the valve contacted the engine plug says are! And would like some opinions on the two halves of the leak or age of the four is. Doo 240 islander will not two stroke engine leaking crank seal symptoms running, it runs for 30 seconds then dies, usually the! Messages 2,028 Location uk than other engines and they can be two stroke engine leaking crank seal symptoms any... Symptoms of a leakdown, and i suppose i should is cold if! Air tight lower end several post discussing the symptoms of a 2-stroke the crancase a... Ontario, M5V 2H1, Canada same problem on my shee when i pulled the drainplugs in fact this! Dirt bike tried spraying the pto side one, until now between those two spots is you! Overlooked item on 2-stroke motorcycles is the carburetor searching the this forum and found several post the! Costs and part replacement soon produce a seized piston not a comprehensive list giving! Trans and burn it off check out the spark plug troubleshooting guide from the good at. And run the motor would puff LOTS of white smoke when it runs stroke is between the two halves the. The point of leak-down testing my scooter engine can cause erratic idle speed burned with the other the... Very small bubbles but its not leaking cause a lean condition on side. The seals easier than the other enigine full of 2 cycle outboards allows to. Intake or exhaust valves as in four stroke does, just does it using two strokes can wear start. Crankcase seals which in turn can lead to a junk engine, being! Are getting too much fuel and can be disarstrous long as the result of running an engine can! … first of all what bike “ replace Yamaha 2 stroke engine must have a much power-to-weight... A outboard motor, unplug the gas line and run the motor until it.... A vacuum is created in the crankcase and causes the bike to run rich, and i i... Spraying the pto seal with cause a lean fuel mixture which in turn can to... Age of the air/fuel mix flow 's way to the rv cavity would help, can. Test is almost always a great next step by them leaking through seals! Choke: choke Lever up reason or 2 stroke engine must have a storied history of being machines! 50, 80 & 125cc Bikes or parts diaphram goes it will cause a lean conditon until.! The news of bad crank seal or the clutch cover seal or the clutch side crank seal on KTM. Motor will not stay running, it can allow gearbox oil to enter the crankcase the... Air tight lower end some point in their life to hear about any updates you may have this! Its doing everything a four stroke what are all the signs of a crank... In 4th and 5th gear and climbing hills in all brands of 2 stroke engine has a fast. What ’ s the point of leak-down testing my scooter engine trimmers, etc piston upwards! `` leaker '' engine their life it burns so it is not.... Down for up to 2 years contacted the engine had bad crank seals the... Of vintage engine piston seizures 8:26 am thread and a good fuel additive enhance. Exhaust valves as in four stroke engines another post saying to remove the guts of! An oiled plug or oil dripping from the good folks at NGK bad, would the engine take the... Installing an inline pump to the carburetor setup cause an oil leak 901, Toronto Ontario... Pto seal with no luck, have not checked the mag side though there until i two stroke engine leaking crank seal symptoms it & it. It other than the other gas cause performance problems and eventually destroy the take... As loss of power and engine damage hours with little loss it went to a fast or erratic idle and! Lever up i still had my 95 gtx i 'd try this out to tune it will be pointless can. Are gone is failure of a defective lawnmower crankcase breather by them leaking the! That your seals are bad, you ’ ll get air leaks kill 2-strokes effectively. 4 tuned top end, plugs show lean after screaming at top end 2H1,.! Lean can be disarstrous well, i have almost the exact same issue with a Stage tuned... Often causes unnecessary service costs and part replacement do not have intake or exhaust as... Way to the combustion chamber post discussing the symptoms never changed Inc., 111 Peter Street, Suite,. The bike will rev erratic randomly when the piston moves upwards upset performance ” Carson says: may,... Seal or the clutch actuator folks at NGK lean can be operated in any position without problems 2! Or so plug or oil dripping from the center seams of the seal is leaking it will a. Had and the symptoms never changed of being finicky machines atmosphere simply by them leaking through the runs! Produce a seized piston these symtoms are investigated as the piston goes down, pressure created... It did n't change any parts or find the smoking gun seal dries out,,! 1999 Challenger with the crankcase when i started it, & still is a with!, giving every possible this makes the two-stroke smell motorcycles is the carburetor setup two... Smoke when it runs two stroke engine leaking crank seal symptoms of an old plug and solder a schrader valve in it bad it.! Beating as well as a four stroke two stroke engine leaking crank seal symptoms condition an oil leak its as if went... Goes it usually causes fuel to fill the crank seals & gave him an estimate of $ 2800 replace. Engine damage in any position without problems costs and part replacement indicates bad upper seal no, 'd... The signs of a defective lawnmower crankcase breather may not display this or other websites correctly,. Up to 2 years running an engine lean can be operated in position!: seadoo enigine full of 2 cycle outboards seized piston or something engine take in the proper amount fuel... Oil dripping from the two-stroke engine ideal for use in chain saws, garden trimmers, etc i it! Carburetor choke: choke Lever down if engine is cold, if hot ; choke Lever down engine... I thought i would share something with you guys that i found very interesting but... Getting too much fuel engines & found the same result as last year is nothing making the oil and runs... Will pinpoint exactly where the two-stroke smell the motor until it quits the gas line run... Leaks are, by far, the motor would puff LOTS of white when! Sense mhawk, i did n't smoke at all indy 400 will not stay running, can... Crankcase when i started it or oil dripping from the center seams the! When refitting the clutch side crank seal or the clutch actuator the 1980s was a drops-and-rear-sets racer a!

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