OMC Expert help needed.

[Taasman]

I have a 125 hp Evinrude. Here is what I have found so far...This is the electric push button shift. It never goes out of gear, yet it slips when you put direct power in forward.If I ease the throttle up it will plain out. I connected a jumper wire to the solinoids to test if they were the problem, and they check out fine. 5.7ohms on the solinoids and 12 volts in neutral/reverse no volts in forward. So these have been eliminated. The shift button is working good based on my tests. I switched props to check if it was a spun hub problem...its not that. So I have come to the conclusion it must be within the gear portion somewhere. What should my next steps be to determin the problem. Again, its almost as though it is going into neutral...or not meshing in the gearbox somehow??? Any clues to help me from here would be much appreciated.

 

[Taasman]

Re: OMC Expert help needed.

bump

 

[OBJ]

Re: OMC Expert help needed.

Taasman....maybe I missed a previous post....but just what exactly is it doing? Could you also post a model number or year?

 

[Taasman]

Re: OMC Expert help needed.

It is a 1972 electric push button shift Evinrude 4cyl. It seems like its slipping on the clutch dog. Under direct power its like....it slips into neutral and revs up...like its out of gear. I took it out on the lake yesterday and with jumper wires hooked to the solinoids wanted to see what they did with my meter. They are working fine. The boat goes into forward and into Neutral and into reverse fine. Just if your trolling after some time it will like pop out of gear, like its going into neutral. If you shut the key off and turn it on again and hit forward, away you to until it does it again. If you put it in forward and put full throttle it starts off, then revs up high again as it seems not engaged. But if you back off on the throttle it will move ok. If you take off and ease the throttle up very very slow it will stay in gear and run ok. I think its a gear related problem...My prop is def good, as I tried it with my spare one and same thing. I tested the solinoids and shift selector and they both check out GOOd my brother-in-law is an electrician and he says everthing is good from the shift box to the solinoids. He thinks based on my book, is the clutch dog and drive gear somewhere slipping out from engagement. I have removed the bottom end and attempting to slowly disassemble it. Not got the bearing holder out yet as I need a puller. I need some snap ring pliers as well I think. What should I look for or anything you could recomend would be of great help. Thanks!!

 

[OBJ]

Re: OMC Expert help needed.

Taas....sounds like one of two things. Either ya' got two bad props or you are getting stray voltage to the neutral solenoid.<br /><br />Have you tried putting a reference line between the rubber hub and metal part of the prop? If this line moves after the problem occurs, the hub is spun.<br /><br />Do you have a service manual with wiring diagrams? This can be a big help when trouble shooting.<br /><br />I don't honestly think you will find anything by tearing the gearcase apart. Have you noticed any metal shavings in the oil?<br /><br />And speaking of oil....are you using premium C lower unit oil? Nothing else will work right. Premium C is made especially for electric shifts.

 

[Taasman]

Re: OMC Expert help needed.

Jim, as I stated...the solinoids are working fine.I ran a test lead while driving the boat and monitored the voltmeter to see if power went to the solinoid while it was in forward and we were driving...( it remained at no volts ) while driving in forward. What we were looking for was for voltage going to the solinoid that would have been kicking it into neutral...not so! If we stopped the boat and shifted to neutral, we detected voltage on the solinoid wire.If we shifted to reverse we had voltage...so this indicates they are working the way they should. If stray voltage was activating the solinoid like you suggest, we would have detected that when we were in motion...thus activating the solinoid and kicking it out of gear. If we back off on the throttle we are still in gear after it slips and can continue to propell forward as long as we don't put the throttle up...if we do throttle up it revs up high like its disingaged. Do you not think that the clutch dog ears could be rounded off and are engaged slightly with the forward gear...that explaining why it is engaged with the prop shaft, but once you ask for power they are coming out from engagement with the prop shaft. Like I said...if I ease the power up very very very slow I can eventually get up to speed and plain out.( Because the clutch dog ears are holding it in gear, but NOT when using full power)<br />I was reading a very simalar post somewhere in one of these threads about just that. Thanks...I need all the help I can get!!!

 

[downjigger]

Re: OMC Expert help needed.

Taas-<br />I think if you were jumping in and out of gear you would know it by sound or at least feel it grab-motor would react to this by moving some. What about cavitation? Is the motor set at right heigth on transom? Does the slippage occur when turning?<br /><br />I wouldn't look forward to taking the lower unit apart unless I was absolutely sure the problem was there. Do you have a rough idea of how many hours on this motor or how much it has been used(abused)<br /><br />Just food for thought.

 

[Taasman]

Re: OMC Expert help needed.

If my HR meter is correct 1069 Hrs. This motor has worked fine all along. Not hit anything that I know of. Now...the gear oil was a little discoloured...kind of an olive colour. I did put new oil in it since. Type-"C". Is there a way to flush the bottom 100% clean? because I did put one bottle of 90 oil in it yesterday by accident, tested the boat at the lake and since drained it and put in type C and tested it again. Same condition exists. Transom has not changed still mounted as original. However...would it make a differance if the latch that holds the motor locked to the down position rod...part of the tilt was not locked? Because my tilt has never really worked that great, but does work. Just that its not locked...down! I hear no grinding of gears when it slips. It has even done this slipping of late when trolling for a period of time. The spare prop that came with this boat is a used one...could it be spun??? hmmm 2 spun hubs? whats the chance of that? I did put the prop on upside down so I could clamp the prop shaft with vise grip and tried to turn the prop to see if it would spin on the hub...put alot of force on the prop by hand and it never moved on the hub...could that be differant in water I don't know? I never hear any clunks, bangs or gear grinding...just the rpms go right up (LIKE) its gone out of gear...but if it did go out of gear when I back off on the throttle I can continue forward as long as I dont put a sudden burst of gas. I did notice when I dropped the unit down that there is supposed to be two plastic tubes that connect to the upper exhaust tubes...and mine seems to be missing one. The impeller looks good, except the base plate is a little grooved from the impeller rubber wearing on it. Thats as far as I have gone...should I put the unit back together? Or pull the gearbox apart...that is the question??

 

[G DANE]

Re: OMC Expert help needed.

Taasman<br /><br />Concerning the propeller hub. You have a 125HP right ? You are only able to put a very little force on prop by hand compared to that. My brotherinlaw just spun his prop on a 25HP, wouldnt believe this was the problem as he souldnt move it by hand. Borrowed a new prop from me and viola - new again. Try another prop.

 

[Joe Reeves]

Re: OMC Expert help needed.

For what it's worth.....<br /><br />A slipping hub (faulty prop) can be checked on the engine by inserting a 2x4 between the prop and the cavitation plate to block the prop from turning. Have the engine in gear. Attach a breaker bar with the proper socket to the flywheel nut and turn it in the normal (clockwise) direction.<br /><br />If the propshaft turns within the prop, the hub is obviously slipping.

 

[Taasman]

Re: OMC Expert help needed.

Thanks to ALL !!! and the verdict....SPUN PROP X 2 props believe it or not!