lark jumping out of gear under load

[williesmokem]

I just bought a boat with a 1970 40hp evinrude lark, ran ok for a little bit, not much power,but it is a heavy boat 16ft. Quachita, but then started to jump out of gear at any more than half throttle. Are there any fixes other than new parts? I've seen posts that refer to springs and clutches. Any info is greatly appreciated. Thanks, Chris

 

[Haffiman]

Re: lark jumping out of gear under load

Only way to find out is to split the gearcase.
Most likely some new parts will be needed like dog and gears.

 

[jasper60103]

Re: lark jumping out of gear under load

I just bought a boat with a 1970 40hp evinrude lark, ran ok for a little bit, not much power,but it is a heavy boat 16ft. Quachita, but then started to jump out of gear at any more than half throttle. Are there any fixes other than new parts? I've seen posts that refer to springs and clutches. Any info is greatly appreciated. Thanks, Chris

You might want to check your shift rod and connector in the leg. See #56 & 63 in attached diagram. The shift rod needs to be properly secured in the indent with a screw and lock-washer, and no play in it. Then move up to the gear shift lever and control/cabling if this is a remote setup. There could be some adjustments needed there, you get the idea.

 

[williesmokem]

Re: lark jumping out of gear under load

Thanks for your response jasper60103,That sounds like where I need to start. It is push button shift with wires running into leg. Also when I throttle back it goes back into gear. Thanks again, Chris

 

[Haffiman]

Re: lark jumping out of gear under load

Being electric shift, quite a different game than mentioned above.
It might be the forward clutch hub giving in, but if you are 'lucky' only the propeller hub.

 

[williesmokem]

Re: lark jumping out of gear under load

Thanks Haffiman, Should I start by draining lower unit fluid, and checking the shift lever as jasper suggested? If it is hub or spring related,would there be metal in oil? Also, do I split the mid section, or does it have to be dis-assembled from the bottom?

 

[slag]

Re: lark jumping out of gear under load

Youre running type C gear lube, right?

 

[Vanover]

Re: lark jumping out of gear under load

If it is the hub no need to drain the oil as there is likely no gear damage do to the hub slipping. You can drain the lower and check for contaminates if you susspect the fwd gear. Does it do it in rev as well? Not sure of your speed, if its low you might be able to check. You will need to remove the lower. The mid section contains to the water and spent gas tubes. Should have a cavitation plate. Along that should be bolts. Remove them and inside will be your shift wires and a drive shaft and water pump. Should come apart below the #62 and above the #26. Its rough but there is bolts in that area. Good luck. Hopefully its the hub.

 

[williesmokem]

Re: lark jumping out of gear under load

Didn't notice it in reverse,in forward had some slippage at half throttle, any more than half it will jump clear out, but re-engaged when I throttled back.I idled it in to dock and shut it down. I did seem to notice an extra whine on the move right before the one when it kicked out,had not checked lower unit oil( I know...bonehead move) but I am going to check and replace it now. My local marina dealer says thier premium blend lower unit oil is the same as type "c". Thanks Vanover and to all those who have replied. One other thing...shouldn't water pumping be a steady stream? Mine seems to be spitting, spraying rather than a stream. Does anyone have part # for impeller itsself or a kit?

 

[williesmokem]

Re: lark jumping out of gear under load

Thanks to all who replied, I have not opened it up yet, it is leaking milky oil out from the shaft in front of prop, quite a bit of play in prop. It has a pin behind prop,does it also have the rubber hub? Does anyone have a parts list with parts numbers for model 40073a 1970 evinrude lark 40hp selectric shift

 

[F_R]

Re: lark jumping out of gear under load

Don't go tearing into that thing till you diagnose the probelm. First, check the prop hub for slipping. Then check the voltages at the shift wires.

 

[jasper60103]

Re: lark jumping out of gear under load

... Does anyone have a parts list with parts numbers for model 40073a 1970 evinrude lark 40hp selectric shift

Just a FYI, you can look up parts and diagrams for you motor here...
http://shop2.evinrude.com/Index.aspx?s1=fkkljv8iv93scnk19fer7m9504&catalog_id=0&siteid=1

 

[williesmokem]

Re: lark jumping out of gear under load

Don't go tearing into that thing till you diagnose the probelm. First, check the prop hub for slipping. Then check the voltages at the shift wires.

What is the best way to check for hub slippage?(key on, see if prop will turn by hand while in gear?)

 

[williesmokem]

Re: lark jumping out of gear under load

No lube! Can anyone tell me the lower unit type"c" lube capacity? Also there is an open, approx.1/8" hole, opposite side of lube drain hole just below where prop shaft casing bolts to lower unit.

 

[F_R]

Re: lark jumping out of gear under load

It holds approximately 16 ounces of oil. There is supposed to be a drain hole right at the seam where the upper and lower parts of the gearcase bolt together. No holes below that point.

I wish you luck. There is a chance that you don't have anything left to fix, if it has been running without oil. Before you fill it up with that expensive Premium Blend oil (replaces type C), I suggest you fill it with some Dexron ATF to see if it leaks or slips. That will flush it out and won't hurt if for a short trial time.

 

[petryshyn]

Re: lark jumping out of gear under load

If it turns out to be a prop, phone this guy if you need one......

Larry 780-439-6906

 

[williesmokem]

Re: lark jumping out of gear under load

thanks FR, I filled it with dexronIII for right now,it had fluid when I went out and I quit running it right after it jumped out, it has some leaks, one of the bolts right below the 5" side plates seems to be stripped, leaking milky fluid from there, also no gaskets on fluid level or drain screws.Was leaking around the drain screw.Could I use thread tape on the screws?

 

[williesmokem]

Re: lark jumping out of gear under load

Is the hub, that is refered to, inside the prop? Or in prop shaft casing? Can I check for slippage without going to the lake?