replaced spun prop now whats wrong?

[MakO17 90 EvinrudE]

hey guys im new to the forum hoping to find some helpful input on my situation. okay lets go back to summer of 2009 everything on my 1996 evinrude v4 90hp was running great. its on a 1990 mako 17 center console v hull. the motor ran great rarely gave me trouble. this past winter i didnt use it much it sat for 6 months i would say, about 2 months ago i turned it on it cranked right up so i decided to take it to the everglades. it ran for about 3 miles great i slowed down and then eventually went to start taking off again... and i very loudlyreved up and spun the prop. i had to replace the prop same size of 14 17 i believe, and i also had to replace 2 carb float chamber covers for they were leaking gas from a little side hole. i thought this would be it so i took it out to the glades again.. and this time when i would start it, it ran great idled fine reved up in neutral fine i went into gear and began idling up the lake, when i gave it throttle down, it began to rumble in the water at low rpms and the boat would not move much faster then idle speed. im hoping i can get some advice from you guys it would be greatly appreciated. ive read som other threads of similar symptoms and i saw suggestions such as compressions tests check and change spark plugs, clean out all carbs, so i am goingto trry these things. anything other advice will be greatly appreciated. thank you

 

[LongLine]

Re: replaced spun prop now whats wrong?

How's the splines on the shaft?

Tom B.
(LongLine)

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

How's the splines on the shaft?

Tom B.
(LongLine)

the splines on the shaft coming out of the lower unit are fine. all the teeth are in order and no visible damage what so ever. im almost positive i put the thrust washer on correctly as well.

 

[chead98]

Re: replaced spun prop now whats wrong?

I think I'm having the same problem on my 9.9 Evinrude. Revs great in idle but when I put it in gear it barely moves. I have a post and they say it's probably the bushings. Now I have to find out where they are located...
Good luck and keep us posted.

Chris

 

[bob johnson]

Re: replaced spun prop now whats wrong?

I am jumping in because i have the same motor i think ( 97 though) and i am always wanting to hear what people are experienceing..that said, and while I am here....id say you need to describe whats going on a little more...

good foundation...but once you describe when the problem happens...I am thinking a lot of things are being left out of your description..

throttle down...to you might mean pusing the throttle down( forward)...but to many people throttle DOWN means to DECREASE speed!!!

I try to phrase how i descrbe my problem at least two different ways sometimes, so if i didnt word it right one time maybe I did a better job the second time.

we forget because it is in our head so WE dont need a lengthy description...but everyone else could use it!!

anyway...you throttle which way?? up i assume and the motor starts to shake and vibrate..anf you dont go fast..

but what is the RPMS doing??? are they going UP and UP with the throttle??

or is the motor BOGGING down???

id suspect something with the carb, because a new prop isnt going to give wishy washy problems..it is spun also or it is good!!

so back to the carbs..maybe it didnt go back together just right!!!, float height? any number of things..

I like to keep a spray bottle of gas..and run with the air silencer off..if i suspect carb flow issue, i squirt a shot into the openings.... if she revs...then I think i had a fuel delivery issue

if nothign happens i start to thing electrical....just me...not a good science...but it helps

is your motor a 60 degree looper?

good luck

 

[mikesea]

Re: replaced spun prop now whats wrong?

You say you changed the carb float covers.Those covers hav jets in them.Are they new ,used?did you change the jets?or switch them from the old to new bowls?/

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

I am jumping in because i have the same motor i think ( 97 though) and i am always wanting to hear what people are experienceing..that said, and while I am here....id say you need to describe whats going on a little more...

good foundation...but once you describe when the problem happens...I am thinking a lot of things are being left out of your description..

throttle down...to you might mean pusing the throttle down( forward)...but to many people throttle DOWN means to DECREASE speed!!!



okay thank you for the advice. i mean full throttle when i said throttle down, sorry for confusion. yes when i try and full throttle it just goes to real low rpms and begins to shake and vibrate. i have taken off the carb float chambers(all 4) as well as the 2 carb plates from each side they seem clean i blew them out anyways withcompressed air. the motor is a 1996 evinrude v4 90 hp loop charged, thats all i know about it. i did not find much gunk so i dont think that i have solved my problems yet. i also changed spark plugs out. the motor runs great at low speeds up and down the lake all day, but the second i begin to go about half way into foward throttle, it begins droping in rpms and shaking and vibrating the motor andthe booat simply will not increasein speed, ( it trys to plane the boat, but theres simply not enough power.other than this, the boat has never acted like this for 3 years, no problems, only some dry rotting.

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

You say you changed the carb float covers.Those covers hav jets in them.Are they new ,used?did you change the jets?or switch them from the old to new bowls?/

okay when i removed the float bowls, i only replaced the cap of the bowl in which there is a gold drainplug in the front. that was the only enterchangable part on the cover( the gold drain screw). how ever i am currently taking off al carbs and float bowls as well and running some air threw everyhting. i have only found one smal piece of dirst in one of the metal filter screens located on the front of the actual carb.

 

[bob johnson]

Re: replaced spun prop now whats wrong?

what are the RPMs when the motor starts to buck in gear???

and what can you rev the motor to in neutral( dont rev too high..maybe 2000 max)

cant help but think it is something in your carb work...

you check to verify all the plugs are firing...right???



good luck

bob

 

[cougar1985]

Re: replaced spun prop now whats wrong?

make sure your connection for the fuel is going in and clicking into place correctly.i particularrily mean at the motor but also check the whole system,you cant believe the trouble a simple loose connection can cause.years ago i had a big problem with a motor and evevtually had to get a tow back to the launch,imagine to my suprise when checking over the motor i fiddled with the fuel line at the motor and CLICK! thers the problem ,it looked ok ,pumped some fuel into the motor but somehow it had come undone ,even looked perfect until i pushed it and presto all problems solved.the blasted thing even ran but ran like crap and died several times all for a improperly connected fuel line!

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

well my rpms are about 2000 when it starts to bog out.. i clened out the carbs and also looked into the fuel system everyhting looks good in there. im pretty lost ive checked evry fuel line and im getting plenty of gas to the carbs. my spark is good however my plugs are pretty dirty, im goingto throw in some new ones and see whast goingon.

 

[Faztbullet]

Re: replaced spun prop now whats wrong?

I think Mikesea may have nailed your problem, if you changed the bowls there are jets behind the "gold' drain plugs. If you did not check size or swap them over it may be getting to much fuel and the result of your dirty plugs

 

[trendsetter240]

Re: replaced spun prop now whats wrong?

Go back to the basics. Compression, Fuel and Spark.

Check the compression and look for 100psi or more per cylinder. The compression readings on each cylinder should be within 10psi of each other.

Check the spark on each cylinder with a spark tester. Look for a hot blue spark at about 1/2 inch.

Check the fuel delivery system, fuel tank, fuel line, fuel bulb, fuel pump and carbs. Try pumping the fuel primer bulb while the motor is bogging to see if that changes anything.

Also, to test if you have a cylinder that's not getting fuel: Start the motor with the cover off and let it fast-idle. Take a can of aerosol carb cleaner and spray it in to each carb throat and observe the engine reaction.

If the engine bogs down; that is good. If it revs up then that cylinder is not getting enough fuel. (or any fuel)

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

okay guys thank you for all this great advice, i just noticed all these new replies, and yesterday when looking at the carbs i noticed that i did not switch the jets from old to new bowls. newbie.. i know... how ever i have learned alot these past 2 weeks. ive taken apart my evinrude 96 ocean pro 90 hp at least 5 times. so today i am going to buy 2 new jets as i threw the old bowls away. also one quick question, yesterday after trying for about an hour to get the boat to turn on and stay on in the water, i pulled the boat back to my house, and i noticed alot of black oil sludge comming out from behind the prop area. a good cup poored outta there. could this be a possible blown seal? or just from running the boat with the 2 missing jets?. thank you again for all the help

 

[mikesea]

Re: replaced spun prop now whats wrong?

Your probably flooding it to death,get your old bowls,look inside behind the gold plugs,there are jets in there,you need a small screwdriver,preferably a jet driver,whatever,your probably running without jets and that would be reason for a bunck of crap pouring out your exhust

 

[bob johnson]

Re: replaced spun prop now whats wrong?

okay guys thank you for all this great advice, i just noticed all these new replies, and yesterday when looking at the carbs i noticed that i did not switch the jets from old to new bowls. newbie.. i know... how ever i have learned alot these past 2 weeks. ive taken apart my evinrude 96 ocean pro 90 hp at least 5 times. so today i am going to buy 2 new jets as i threw the old bowls away. also one quick question, yesterday after trying for about an hour to get the boat to turn on and stay on in the water, i pulled the boat back to my house, and i noticed alot of black oil sludge comming out from behind the prop area. a good cup poored outta there. could this be a possible blown seal? or just from running the boat with the 2 missing jets?. thank you again for all the help

I doubt it is a blown seal..but if you want to verify, check the LU fluid for water...

I got the carbs with the leaky side hole...I dgreaes it really good with a huigh evaporative electical cleaner and then gobbed a small piece of paper towel soaked in instant glue on the spot...it has held and not leaked for at least 20 trips so far.

but when I do, do a carb rebuild I am getting new bowls as well.

was it verified that the prop was infact spun?????

did you make a mark on the prop and hub and see that they changed relationship? verifying the hub was spun?



bob

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

I doubt it is a blown seal..but if you want to verify, check the LU fluid for water...

I got the carbs with the leaky side hole...I dgreaes it really good with a huigh evaporative electical cleaner and then gobbed a small piece of paper towel soaked in instant glue on the spot...it has held and not leaked for at least 20 trips so far.

but when I do, do a carb rebuild I am getting new bowls as well.

was it verified that the prop was infact spun?????

did you make a mark on the prop and hub and see that they changed relationship? verifying the hub was spun?




bob

yes the prop was bad i got a new one and hopefully tuesday my jets will be in from dusky pats center. i took off my prop today and noticed that the first seal you see behing the thrust washer is a little out of wack a side of it sits flush and the other side of the seal kind of comes out a bit. i do not see any leaking fluids coming from the seal. i checked the lower unit liquid and it looks great still brand new looking, no water. is it a big job to replace just hat outside seal behind the thrust washer . thanks all for the great advice

 

[bob johnson]

Re: replaced spun prop now whats wrong?

yes the prop was bad i got a new one and hopefully tuesday my jets will be in from dusky pats center. i took off my prop today and noticed that the first seal you see behing the thrust washer is a little out of wack a side of it sits flush and the other side of the seal kind of comes out a bit. i do not see any leaking fluids coming from the seal. i checked the lower unit liquid and it looks great still brand new looking, no water. is it a big job to replace just hat outside seal behind the thrust washer . thanks all for the great advice

if you got no water in the lower unit, I doubt your are leaking from the seal

I have heard that it isnt that big of a job to just replace that outer seal, BUT WHY bother??

good luck

bob

 

[MakO17 90 EvinrudE]

Re: replaced spun prop now whats wrong?

if you got no water in the lower unit, I doubt your are leaking from the seal

I have heard that it isnt that big of a job to just replace that outer seal, BUT WHY bother??

good luck

bob

okay cool thanks alot