83 140 evinrude pistons

[topdawg487]

alright am new at this so bear wit me i had the pistons replaced in mar of 04 the mechanic said a loose wire in the stator caused double fireing in cyilinders 2-4 so we changed the stator took the boat out did the breakin period everything fine but when i brought the rpms up the motor whould drown out and run like crap brought it home and took out the plugs to find metal on both 2-4 took off the head and sur enough both 2-4 were burt up again took the boat back to the mechcanic and he replaced 2-4 put new coils new powerpacks new plugs and wires took the boat out again same problem when i brought the rpms up motor drows out when to take the engine cover off and recived a electric shock from the cover took it home ran her and you could see the spark jumping from the spark wires to the block changed the wires again and still did it so the pistons are burt again the mechanic will change 2-4 for free but i dont think he understands electrictypart he just keeps sugjesting parts change so i dont know im looking for u to tell me what steps i need to take to figure this out or what information u need me to get from the motor so i can help u help me thank for your time

 

[marinegrh]

Re: 83 140 evinrude pistons

wow, if you can understand what you just posted well you a better ham than i .....from what i got you have had the 8 pistons put in this engine. 4 the first and 4 the second, a stator, 4 ign coils and secondary wires and a power pack in a pear tree...send me the engine, ill make it right...or find another mechanic, one who knows what is going on...first, is the engine blown up, whats your compression, second, what condition is the ignition system in, eg: post the outputs from the stator, timer base, powerpack, and coils....next, what is the fuel system like, are you changing pistons because lack of lubrication, overheating, hows you water pump and stats. is the engine running to lean are the carbs adjusted right etc...see where im going with this....you need to know certain things before you just start changing parts out..one thing i hate and i am sure alot of marine mechanics--good ones agree is a parts changer mechanic. anyone can change a part only a mechanic can repair an engine....so start wiht some of the basics first and get you compression and outputs posted for us to see......good luck

 

[topdawg487]

Re: 83 140 evinrude pistons

sorry for the grammer and im not much of a mechanic to understand what to tell ya about but i have read the repair manual and do understand what u are asking me to tell you i have the heads takin off so i can tell u there probly isnt very much commpression in cyilinders 2 and 4 because the are burt from what looks to me like a double fireing just cant figure out why ill get thoose outputs for ya done that once but didnt know how to interpret the results tks for the reply

 

[walleyehed]

Re: 83 140 evinrude pistons

I believe I would do some serious reseach into the carbs to start with......perfectly clean is the only excepted condition...#2., I'd verify max timming advance, and make sure it's 2 degs or more BELOW max.<br />What brand and number of spark plugs are you using?????

 

[marinegrh]

Re: 83 140 evinrude pistons

are they burnt from a lean condition or are the scorched from ignition, that is where you are gonna have to do some snooping, if you can get some pics and either post them or e-mail them to me @ maringgrh@bellsouth.net ill help ya anyway i can ...good luck

 

[Dhadley]

Re: 83 140 evinrude pistons

Side to side usually means ignition. Across usually means carbs on those motors.