1984 115"tower of power" may have had it

[caldog101]

Well i have had this motor for about 3 years. All you guys were instrumental in bringing it back to life back in march of 2006,since then it has run FANTASTIC but the other day it took a turn for the worst,i will give you a play by play
went fishing the other day
motor was idleing high from the beginning 1100 rpm compared to 750 normal
would not idle down
we were 3 miles out of biscayne bay when motor shuts down completely
we were doing 5300 rpms
then it would not start finally got it going but was running rough and missing a cylinder would only do 1400 rpms
it was not hot at all
got back home started it up and pulled #4 "from the top down" spark plug wire and motor did not hesitate so that was the problem
so we took off the spark plug and there was something stuck in the spark plug hole looked like stainless steel could not see the piston at all so we took the head cover off and that did not help because the cylinder is enclosed "yes i have a manual" on my old evinrude when you took the head cover off you have a full view of the cylinder so i figured this was the same broke a couple of bolts,so i picked up my manual and i think it's part of the reed valves i tried to pull it out and it fell in the cylinder what do i do now thanks sorry it was so long

 

[Laddies]

Re: 1984 115"tower of power" may have had it

You will need to remove the powerhead and do a teardown to see how bad it's damaged. In a lot of cases the damages are quite small.

 

[caldog101]

Re: 1984 115"tower of power" may have had it

Thanks for the quick response Laddies, so you think it's the reed valve? thats the only thing i can think it is,the piston crushed it against the spark plug opening and it actually looked like the piston crushed it and it looks like the bottom of the spark plug,I was looking at the manual it looks like there are 3 of the reed valves attached to the crank shaft,i am not sure i want to break down the power head,i broke 2 bolts on what i thought was the head and my next step was to take off the exaust cover to take out the piece of reed in the cylinder but those bolts look worse and even then i would still have to break down the power head to get at the valves not sure if with the age of the motor if it is worth it,
last year i bought an identical motor 1984 115 in-line six real cheap that i have been using for parts," the man that sold it told me it was running before , i am wondering what i can do with that,so far i have taken the solenoid,starter,trim and tilt,and rectifier off the old motor,i was thinking of putting all that stuff back on it and then check compression on that motor " the reason the spare motor would not start was the carbs and fuel pump sat for a long time" let me know what you think about that thanks

 

[Laddies]

Re: 1984 115"tower of power" may have had it

I certainly understand the problem with the water jacket cover bolts, they are the hardest bolt to get out on the engine. A typical reed problem can be as simple as the reed going down the cyl wall and jamming the rings, I have done several that only required rings, a set of reeds and a gasket set, these were low hour engines that ran well before the reed went through them. The worst case is a reed that damages the cyl. wall and destroys the piston on a worn out engine that requires a rebore on all cyls. and complete rebuild and many different scenarios in between. Not tearing one down one never knows what there options are. Tearing one down and find it's not worth repairing you at lest have a better understanding of the working of the engine. Nothing ventured nothing gained I guess.

 

[caldog101]

Re: 1984 115"tower of power" may have had it

Yes I will definately tear the motor down,but in the meantime i have put all those parts i mentioned on the "SPARE" motor,came home this afternoon and started the motor on a rack i have,it took a little coxing but I got it started compression 105-110 ,i will be putting it on my boat this weekend,and then i could start taking the other powerhead apart and see how much damage there is.Worse case senerio i guess would be a scored cylinder,or rings or piston,i know i would probaly need to change all 3 reed valves,which to be honest with you i have never done,and would hate to invest in a 24 year old motor and is beyond my capablities. I know i can take it apart but putting it back together correctly i would not attempt it" thats for the experts" any ways if the power head is damaged at least i have all those extra parts that i can use on the "new motor" one last ? to take off the lower unit do i have to put the shifter in reverse? the manual is a little confusing
thanks

 

[Laddies]

Re: 1984 115"tower of power" may have had it

No, just replace the reed plates on the cyl. that broke and check the stop heights on ll the reeds, there is no need to change the assembly unless the engine has poor idle because the labyrinth seal between the cyls. on that block is bad.

 

[caldog101]

Re: 1984 115"tower of power" may have had it

thanks for your help
2 questions
do i need to put shifter in reverse to change lower unit?
i am going to replace the cylinder head gasket "where the spark plugs are at "do i need gasket sealent for this or just the gasket?

 

[Laddies]

Re: 1984 115"tower of power" may have had it

Even though the book says forward I always use rev. as the shift cam can jump by fwd. gear when assembling the engine. When installing the water jacket cover I check the cover with a straight edge to make sure the small boss around the plug area has .005 to .008 compression on the top of the cyls. and a little #2 permatex on the areas around the plugs to help seal any surface damage.

 

[caldog101]

Re: 1984 115"tower of power" may have had it

Thanks Laddies i will bring this post back up with in the next couple of weeks after i break down the powerhead to let you know the extent of damage

 

[caldog101]

Re: 1984 115"tower of power" may have had it

Ok guys i have the motor on a lift and i am trying to take off the power head ,but it will not come off ,i have taken the 6 nuts off the bottom of the powerhead ,i had the lower unit off last year to change impeller,is there anything that i am misssing like a bolt or something thanks,i have the motor on the lifting ring with a hoist and at one time it was suspended in air

 

[Laddies]

Re: 1984 115"tower of power" may have had it

There are 8 nuts hold them together

 

[Chris1956]

Re: 1984 115"tower of power" may have had it

As Laddies said, there are two nuts in the front underside of the bottom cowling.

BTW - They are a real PIA to reinstall, since the powerhead must be suspended a bit to start the nuts.

 

[caldog101]

Re: 1984 115"tower of power" may have had it

Ok guys thanks i got all 8 nuts off now do i need to take off the flywheel and the stator and trigger to pull out the pistons and if so do i need to mark any thing thanks

 

[Chris1956]

Re: 1984 115"tower of power" may have had it

I remove the outer flywheel when tearing the motor down. Mark the posiiton of the outer flywheel for easy reassembly. If you need to change the upper main bearing, you will need to pull the inner flywheel.

You will want to clean the carbs, and inspect the reed valves and main bearings. Inspect the lower main bearing, replace the endcap seals

 

[caldog101]

Re: 1984 115"tower of power" may have had it

well finally got the whole crankshaft out with the pistons,piston # 4" from the top down" is melted on the top and all the rings are gone,also # 2 is missing most of the middle ring only about 1/4 of the ring left and no sight of where it went,surprisingly the #4 cylinder looks great,I am contemplating what my next step should be after all it is 24 years old any suggestions

 

[caldog101]

Re: 1984 115"tower of power" may have had it

I also have the same year motor that i have been using as a spare parts motor ,not sure if i could use any of the pistons or rings from that motor,

 

[Laddies]

Re: 1984 115"tower of power" may have had it

Yhe first thing to do is clean the bores and then mic them to see if they are in specs. if they are and the crank is OK, you will know what you will have to have as far as parts. If standard pistons will work and the used ones in the other engine check out OK, yes you can use them with new bearings.

 

[caldog101]

Re: 1984 115"tower of power" may have had it

THanks for the quick response Laddies,because of the age of the motor you can understand i do not want to spend any money on it, I don't mind spending time breaking down the other powerhead, i was thinking of mic the cylinder ,if thats ok ,then breaking down the other powerhead and just changing out the piston ,so i will leave the connecting rod on the crankshaft,then take one of the rings off and put it on the #2 piston that is missing the ring,as i said the cylinder looks great, let me know what you think of that idea , also what should i clean the cylinder and rings with CRC thanks

 

[Laddies]

Re: 1984 115"tower of power" may have had it

It would not be the first time thats been done and it's your time I understand perfectly. Check the ring gap on the rings as your doing the reassembly

 

[caldog101]

Re: 1984 115"tower of power" may have had it

Thanks Laddies,I will post this thread back up in about a week to let you know whats happened, i will probably tear down the other power head and go from there thanks again Laddies and Chris