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1994 evinrude 30 hp overheating

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eric.madl

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yes i have an 1994 30 hp evinrude when on the lake today was trying to get max speed ot of outboard my ignition system alarm started sounding and motor started to run real ruff spitting and popping when pushing the rpm up. seams like white smoke coming from exhaust and engine cover getting hot. shut off and let it cool dowm and restarted was fine for about 5 minutes but then started doing the same thing all over again note just changed an burnt out ignition buzzer and the impeller on water pump two weeks ago when i put the boat on the lake two weeks ago. thanks any help will be greatly recieved.
 
If the impeller is good and you havent through any mud flats and sucked up some crud in water pump,Sounds like the T-stat might be going bad. The white smoke is probably steam coming out the exhaust.
 
Charger25 said:
If the impeller is good and you havent through any mud flats and sucked up some crud in water pump,Sounds like the T-stat might be going bad. The white smoke is probably steam coming out the exhaust.
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well i pulled the t-stat but the only part of it was the outer steel cap. the rest gone no copper bottom or inter spring like it all rusted away. any thoughts before i put a new one in and seal up should there be a way to find missing pieses in system could that be causing my overheating. thanks
 
I'm just a shade tree mechanic, but the water passages are pretty narrow and if it came apart I would think they might be stuck in the head. I've seen them corrode with salt water use and cake up with mud and silt over time. Honestly I have never seen one come apart and get stuck in the engine. If it were me I'd try running it with out one to see if it gets hot, if it ran OK might put a new one in and see. However, I would be easy on it and not run it hard or far from a boat ramp just in case. I can only state what " I " would if it was me. Hopefully someone with more knowledge will step in here. Oh yeah and no beer till the job is done.
 
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was it pumping water? some people dont look to see if it has the steady stream of water pumping through it. It could be as simple as just running a small wire up the water outlet port. I have had this happen many times, and it was as simple as that. Just tryin to keep it simple, dont wanna see you go thru a big expensive repair when 30 cents of wire might do it
 
yes it was pumping water. but only after running air through the water outlet hose.also changed the impeller. but note the old impeller looked as good as the one i replaced. probleam was once i put it on the water, after about an half hour running time the over heat alarm sounded and started running real ruff under any thing but low idle . thats when pulled boat of of water took posted advice from above and pulled the t-stat. which like i said was completely missing except for metal top plate,gasket and large spring holding it in. all other parts of t-stat missing core which i think is brass or copper,inter spring and outer housing.also note when first purchased boat there was an burnt out alarm over heat buzzer off of engines ignition does any one know if this thing can still possably still be intact in system and letting the water still flow..
 
Trying to figure out the history of the engine here. Is this a "new to you motor" ? My guess is that the previous owner gutted the t=stat and made a re stricter plate so to speak. I really doubt that the t-stat just came apart, the water passages are too small for the parts to get lodged in the head. How many times have you ran this motor? did you have this trouble before ? I'd pull the lower unit and double check the whole water pump. The top housing where it slides down over the drive shaft might be worn allowing water to leak. Go to the parts section and look up your lower unit and make sure that the pump is assembled correctly . Might be time to replace the whole water pump assy. Shine a light up the mid section and inspect the pick up tube, check it for any holes. I've seen where one had rubbed against the drive shaft and wore a hole in it, patched it with JB Weld. What I'm getting at, is that it is pumping water but just not enough.
 
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well to start just brought boat this spring, had it out on local lake . first two time no probleams. third time out while on water not very fast, so brother tried to turn adjustment screw on throttle cable. thats when motor started running real ruff and over heat alarm sounded. don't know if adjusting throttle cable had anything to do with it or not. note when boat was first purchased i replaced the overheat alarm due to it being fried. then took advice and pulled the t-stat which was gutted and only top remained. then pulled exhust side cover and found an home made gasket which had three out of four water ports completely covered.allowing no water to flow around the head at all.the only port open was the one that let water flow out of nipple on exhaust cover and out water tube. well replaced all ehaust gaskets with factory new. note forgot to mention also replaced head gasket. well put every thing back togeather , have excellant water flow from all areas ,water tube, exaust area and prop area. new probleam can not keep engine running at idle or any other steady speed, have to keep moving throttle back and forth to keep running . keeps stalling and have to choke each time to get started,oh yea have to keep pumping bulb on fuel line too. well thats the complete history .sorry it took so long to get back but was waiting on back order og gaskets.any help will be greatly recieved.
 
A " new to you motor " -----overheating problems ----------not running properly ! -----start with a compression test !
 
If still a problem, do a compression test, then if ok, pull the head and replace the water deflectors. Around that time, it was a service bulletin out concerning this.
 
well did an copression test both cylinders tested @ 130 and131 tried starting again. note it will start on each attempt but will only do this when first choked.then quickly dies.note before replacing head gaskets/t-stat and exhaust gaskets it started fine and idoled smooth now can't keep running.the gas bulb also keeps loosing pressure. also found some new probleams today pulled the flywheel to get at a screw to tighten and found that my charger for the battery has a broken wire explaining why my new battery died.and also a few missing screws. any suggestions will be greatly recieved. thank-you oh yea one more thing when i replaced the head gasket visually checked the water deflectors they all looked good except bottom right side looking at head was prutruding just a little. should i still pull and replace them thanks again.
 
eric.madl said:
well did an copression test both cylinders tested @ 130 and131 tried starting again. note it will start on each attempt but will only do this when first choked.then quickly dies.note before replacing head gaskets/t-stat and exhaust gaskets it started fine and idoled smooth now can't keep running.the gas bulb also keeps loosing pressure. also found some new probleams today pulled the flywheel to get at a screw to tighten and found that my charger for the battery has a broken wire explaining why my new battery died.and also a few missing screws. any suggestions will be greatly recieved. thank-you oh yea one more thing when i replaced the head gasket visually checked the water deflectors they all looked good except bottom right side looking at head was prutruding just a little. should i still pull and replace them thanks again.
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man iam having probleams just replaced the following under the fly wheel ,coil & ay,charge,stator ay,4amp cd2, z sensor ay cd-2 also retainer and link ring.probleam is that it will only start ecach time if choked first every single time. note also changed plugs and primer bulb on fuel line.
 
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