QD-16 lower unit problems

[houseofpeas]

I just purchased a 1955 Johnson 10 hp it had not been run for four years. It started on the 3rd pull but would only shift into reverse and then noticed the milky white oil leaking out of the bottom. It started to smoke so I shut it down right away. should I tear apart or look for a lower unit on e-bay. If so any ideas what other motors are interchangable?
Thanks houseofpeas

 

[samo_ott]

Re: QD-16 lower unit problems

If you're lucky it's only a linkage problem. Check that first. But you might have to open up the lower unit and see what's wrong if anything. Could be a stripped forward gear.

Where did the smoke come from? The lower unit???

Were you running it in a barrel of water?

Milky LU oil coming out of the LU is bad. If it is dark goo coming out of the weeping hole above the LU, that is normal.

Do you have pics?

 

[coolguy147]

Re: QD-16 lower unit problems

umm smoke form the lower unit is pretty scary more then smoke from the motor kinda

 

[houseofpeas]

Re: QD-16 lower unit problems

It was milkey white comming from lower unit. it was in a lake when started. took off in reverse then finaly went into foward thats when it poped out of gear and started smoking and the milky white lu oil came out. I dont have pictures yet motor is up north michigan. ebay has a 1955 15 hp lower unit that I think is compatible. what do you think?

 

[wbeaton]

Re: QD-16 lower unit problems

ebay has a 1955 15 hp lower unit that I think is compatible. what do you think?

It'll fit, but who knows what condition its in. I'd drop the lower unit and take a good look at it and the linkage. That lower unit is very simple to work on and repair.

 

[houseofpeas]

Re: QD-16 lower unit problems

Thanks I just purchased a munual. I dont have a problem working on it. All I needed to know is that it isnt a waist of my time. It sounds like thats the next step thanks. I am new to this forum and it is awesome. Everyone is very helpfull.
Thanks ,
houseofpeas

 

[Chinewalker]

Re: QD-16 lower unit problems

If the throttle setting was incorrect you may not be able to shift into gear as there is an interlock to prevent "neutral drops". Check the gear oil for evidence of water.

Also - your motor is supposed to smoke and it does indeed come from the lower unit. You can cut down on smoke by using a synthetic oil, but mixed at the required 24:1. You'll never eliminate the smoke. Getting the carb properly set will help, too.

Where, exactly, is the oil coming from? Some unburned fuel may be making its way through the motor which will give you the white globs on the water. You can reduce that significantly by properly setting the high and low speed carb needles.

- Scott

 

[F_R]

Re: QD-16 lower unit problems

Yeah, I seriously doubt that milky stuff is coming from the lower unit. More likely it was unburned fuel from a poorly running motor, emulsified with cooling water. Don't jump to conclusions, check the gearcase oil snd see if it matches what you were seeing before.

Smoke is normal. Every dorp of oil that you put in the gas goes through the motor. Some is burned (smoke), and the rest goes out the exhaust (the stuff you saw). Excess smoke and excess oil discharge can come from a poorly running or mis-adjusted motor. It does NOT indicate a worn out engine like as if it were a car or truck.

 

[Retrorude]

Re: QD-16 lower unit problems

I posted a thread that may cover the same problem I am having with my 25 Evinrude. I can't get it to shift into gear consistently. My first impression was that something was preventing it from engaging ie:an interlock device or something. When it does go into gear it sounds smooth. It just seems that something is out of adjustment. How can I test if the throttle setting is the problem? Thanks

 

[samo_ott]

Re: QD-16 lower unit problems

It'll fit, but who knows what condition its in. I'd drop the lower unit and take a good look at it and the linkage. That lower unit is very simple to work on and repair.

Um, I hate to differ but doesn't the '55 10hp have a 4 bolt LU and the '55 15hp have a 5 bolt LU?

 

[wbeaton]

Re: QD-16 lower unit problems

Um, I hate to differ but doesn't the '55 10hp have a 4 bolt LU and the '55 15hp have a 5 bolt LU?

Nope. 1955 has a five bolt LU.

You need to replace your water pump impeller since it hasn't been changed in at least four years. This is a great time to check your linkage.

Ditto with the others on the emulsified oil and LU smoke.

 

[F_R]

Re: QD-16 lower unit problems

Nope. 1955 has a five bolt LU.

You need to replace your water pump impeller since it hasn't been changed in at least four years. This is a great time to check your linkage.

Ditto with the others on the emulsified oil and LU smoke.

Four bolt lower unit came along in 1958.

 

[samo_ott]

Re: QD-16 lower unit problems

Ok, I just went and looked in my garage as I have two QD-15's (1954) there and they both have 4 bolt (I though one was a QD-16, but they were the same), so they changed the LU after '54 then. So '55, '56 & '57 were the three years the QD's went to the 5 bolt LU then. I stand corrected

 

[samo_ott]

Re: QD-16 lower unit problems

Look at this picture of the '55 10. Does it not look like a 4 bolt? That's what I based my opinion on! Oh well. Guess they had photoshop back then also to make the engine look smaller and lighter!

www.old-omc.de/j_1955/seite_04_05.jpg

 

[wbeaton]

Re: QD-16 lower unit problems

Look at this picture of the '55 10. Does it not look like a 4 bolt? That's what I based my opinion on! Oh well. Guess they had photoshop back then also to make the engine look smaller and lighter!

www.old-omc.de/j_1955/seite_04_05.jpg

Sales brochures are notorious for inconsistencies and mistakes. Let's call it artistic license. I can see how it would confuse you.

1952-54 had a four bolt LU, 1955-57 had five and 1958-63 went to the smaller four bolt LU.

 

[Chinewalker]

Re: QD-16 lower unit problems

Yep - keep in mind, there are TWO completely different four bolt lower units. Up through 1954, they 10, 12 and 15 all used the same 4-bolt lower unit. 1955 through 1957 they used the same 5-bolt lower unit on the 10, 12, 15 and 18 (this 5-bolt shared similar innards to the previous 4-bolt). 1958 & up 10hp models used a 4-bolt unit that was unique to the 10. It was based on the 5.5/7.5 unit, but with beefed up (slightly) innards and a different driveshaft.

- Scott