Johnson 100HP Issues Please Help!

[KSBOATNEWB]

New boat owner here and sure could use some help. I bought this boat last winter. The gentleman I bought it from said it ran like a top over the summer but he could no longer get it to start. He said he was selling it because he was tired of messing with it. (I feel as though I bought it extremely cheap) It came with a book (pictured) and I attempted to trouble shoot via the book. I bought a new battery, checked the CDI pack with a voltmeter, changed spark plugs, and checked for compression.

When attempting to start the boat the prop turns with force. My boat is in fact stuck in forward gear. I know this motor has the hydro electric shift. Upon further inspection my lower unit has little to no oil in it. I can see where it all leaked out of. (Where the prop meets up to the lower unit. You can see the stains from the attached pictures) the prop actually moves approx. 1/4" in and out of the lower unit by hand on the shaft. The shaft and the locking nut on the shaft has a gap to where the prop meets (Also visable in the attached pictures)

Can anyone give me insight as to what might be missing? A spacer/gasket/something else??? Should the prop move in and out like it does? I am sure my boat wont start because it is in forward gear and the neutral safety switch wont let it fire without being in neutral. I hope it will shift into neutral if I was to fill the lower with oil. BUT I would like to keep it from leaking before attempting to fill it and get it cranked off.

I guess its a possibility that might not even be my issue??? Any insight would be very much appreciated! Looking forward to getting the family out on the lake this Summer! Thanks!!!

 

[boobie]

Got a model # ??

 

[KSBOATNEWB]

Yes Sir, I apologize for not posting it earlier. It is a 100ESL72R I have attached a picture as well.

Thanks!

 

[boobie]

First thing to do is check the compression on it. If that's okay, then check out the lower unit.

 

[KSBOATNEWB]

Compression is good and been tested. Just unsure how to go about checking out the lower unit?

 

[boobie]

First thing to do is fill it with oil and see if it will shift.

 

[racerone]

When the motor is NOT running it will be in forward gear.--------It shifts to neutral after one turn of the flywheel.-----That is if the lower unit is in good condition.

 

[jimmbo]

Type C Oil only. but beware, there are some aftermarket Type C oils that are not compatible with the Electric and Hydro-Electric Shift models. Safest bet is to use BRP Precision Blend.

 

[KSBOATNEWB]

Thank you for all of the replies! I will get some oil picked up (BRP Precision Blend) and try to get it started. Does anyone have any idea about the gap where my prop and lower housing (pictured) where it looks like the oil has previously leaked out of? Is that normal?

 

[racerone]

Some oil leaking there is normal and is the oil that you mix with the gasoline.----Have the local friendly boat shop pressure test this gearcase.----That is how you find leaks if there are any.------Buy a stainless cotter pin for the prop nut too.-----And the neutral safety switch has nothing to do with it being in FORWARD when the motor is stopped.----The motor needs oil pressure in the gearcase to shift.-----Therefor it must turn to shift.-----If throttle is advanced too far it may not crank either.----Read your manual.

 

[KSBOATNEWB]

What about the play in the prop? How I can move in 1/4" up and down on the shaft? That just doesnt seem like it should be normal?

 

[racerone]

There is a splined washer missing between the nut and the propeller !!----Look for it in your manual.

 

[oldboat1]

You might fill the gearcase with ATF for testing. If it's up and running/shifting, drain and refill with the more expensive Precision Blend. This will help clean the gearcase, but won't tell you if there is a leak unless the test oil comes out milky. The motor uses a 50:1 gas to oil ratio. It would be a good idea to use clean tank with fresh gas -- I like to mix up a gallon or two for testing.

 

[Crosbyman]

is that a crack in the gearcase just below the water intakes ??? :-( or just a paint scratch

 

[oldboat1]

Looks to be a paint scratch when pic is enlarged. Curious about the markings -- purchased at auction, or maybe had been on auction (or maybe a replacement gearcase). Maybe explains why case is drained, rather than a leak.

 

[racerone]

Gearcase is off a 1970 model EVINRUDE 115 HP as per the markings.

 

[F_R]

Spacer / Thrust washer is missing from the prop as previously stated. Now that we've beaten that subject to death, fill the lower unit with ATF for testing only (cheap). Then figure out why the motor won't start. The lower unit has nothing to do with starting or running. In fact, you could completely remove the lower unit and it should still start and run (without cooling, of course)

 

[KSBOATNEWB]

The markings i believe were inventory numbers. I believe it to be a rebuilt/replacement lower unit. I apologize as I have not had the chance to try anything on this boat yet. I am hoping I will have the chance Sunday and will be sure to update with my findings. Thank you all!

 

[racerone]

Markings indicate to me that the gearcase is off a 1970 model.------As per the exact model # of a 1970 model EVINRUDE.