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1985 35hp mercury choke question

J

Jessie

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"Hello, I just recently requir

"Hello, I just recently required a 85 35hp merc outboard and have been fixer her up. I have not worked with mercurys before so I am a bit confused about some of the operation that I hope someone can clear up for me. First the choke seem really wierd to me. I have a litte manual choke knob on the engine and if it is "on" The black flapper covers about 75% of the carb. If it is off, it covers 0%. That seems ok I guess? Now not really sure about the proper operation of it. If I keep the choke off and use the electric choke it will not close the flapper. And even if it did I have no idea how it is suppose to open again, the knob on the front is pretty hard to click over and the springs on the flapper seem to spring in the direction of 75% closed instead of going open. Everything seems backwards to me? Any advice or direction on how this choke is suppose to operate?

Second question: The carb seems to leak when I tilt the engine up, is the float needle sticking?

Third question: The motor does not have trim and tilt, when it is in reverse it unlocks and allows you to manual tilt the engine up. Is this suppose to unlock in the neutral position instead of reverse?

Well, that is about it for now, thank you for looking!

Jessie"
 
"motor should lock in rev and

"motor should lock in rev and nuetral

choke, do you hear a click when the key is pushed in, this would be the electric choke solenoid pulling the choke shut. The knob on the outside won't move. You should see the choke flap move with cover off.

Fuel drip, with engine off and level squeeze fuel bulb, if fuel doesn't drip out of carb you should be ok. Its normal for some fuel to leak out when tilted, the float bowl is vented at the top with a air jet(left upper corner)

Your engine is the same as the 80-83 merc 40hp 2cyl, except the ign has changed and oil inj was added at some point. If you still have oil inj get rid of it and pre mix. There is a post below about 82 merc choke, same thing.
This engine shakes the starter loose, keep an eye on it, it will crack the upper engine case. It also is known for tearing up lower crank bearings, which destroys the crankshaft and lower unit splines.
I have 2 of these, let me know if I can help."
 
"ok, the motor locks in nuetra

"ok, the motor locks in nuetral and forward and unlocks in reverse so I guess that is not right. As for the choke, when I turn the key you can see the choke trying to pull up but it does not, the plastic piece on the other other end of the choke know seems to be stopping it. I am not even sure if it is on right but that position seems to be the only way it operates at all."
 
"the plastic rod piece attache

"the plastic rod piece attaches to a metal plunger, this plunger goes int a choke solenoid. Its a tight fit and could be rusty. The solenoid pulls up on the plunger by magnetic force when energized, I guess it could get weak but they normally either work or not.
Locks in fwd is bad, one stump and your going swimming for parts. Knowing how this lock works I can't imagine how its messed up. Removal of the lower unit is necessary. Let me know when.
To get a better look at the choke, carb and starter need to come off, see other post."
 
"It needs a new waterpump ever

"It needs a new waterpump every 2 years so nows a good time. Clean the fuel system, remove brass plug on bottom front of carb and clean main jet, carb tear down would be better. Change lower unit oil and install new fill plug gaskets every time."
 
"I could be backwards, it migh

"I could be backwards, it might be unlocking in fwd and locking in nuetral and reverse, when I push the shifting lever in the engine back towards the boat it unlocks. Dont know if that is forward or reverse. Anyhow, the solenoid is working, it does try and pull up and would if that manual choke did not stop it. The manual choke plastic keeps constant contact with flapper so it prevents it from closing if it is not choked and it 100% open. if the manual choke is on, it pulls up but no more that what the manual choke is, it serves no purpose when manually choked. Even if I had the manual choke off, it can not close the flapper to 75% closed cause of the tension of the manual choke knob. I dont know if I am explaining it right, might be confusing you more."
 
"Don't shift to reverse wi

"Don't shift to reverse with engine off, it streches the shift cable because it doesn't want go into rev. Sounds like it hooked up right, back on the control is rev. The choke lever on front of engine should be left in the off position unless the battery is dead. I'll look at mine to refresh my memory. parts look up

http://www.usboatsupply.com/Mercury_Mercruiser_Parts_Catalog3a.php?mc=01&ms=2900 &si=412

good vidios lower right
http://www.themarinedoctor.com/cgi-bin//YaBB.pl"
 
"Ok, I checked again. I dont

"Ok, I checked again. I dont have shifting cable hooked up btw, I was manual shifting the lever at the engine. I did verify that it is unlocking in fwd and locks in nuetral and rev so I guess that is right. Now back to the choke. Ok, putting the manual choke off my flapper is 100% open and I assume that is right? But I just dont understand how the electic chock is suppose to close the valve because the plastic connection on the carb and manual choke still make contact? Are yours that way?

Thanks again,
Jessie"
 
"well how else would it work,

"well how else would it work, they have to both move the same part. If you end up taking the carb off you'll get a better understanding of it. When removing the carb the manual choke linkage separates without any disassembly, and the electric choke plunger falls out of the solenoid. Nothing is mechanically connected
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"I did have the carb off to cl

"I did have the carb off to clean it when I got it but I still dont understand the operation. I wish this drawling showed the manual choke connection but I will try and explain a little more. Part 37 has a opening at the bottom, I can get the manaul choke to sit either right under this opening, or right above it on the ledge. If I have it on top, the manual choke is very hard to operate, that positions the flap either 100% open or 75% closed depending if the manual choke is on or off. Now if I put it under the ledge in the gap it is very easy to operate but it falls out of position requiring you to reach in the front of the engine and move the flap (37) back so I am assuming that is the wrong way? If it was right, the electric choke would work because it does not have to move the manual choke and would close number 37 all the way and when the choke released it would spring back to just opening 25% which does not seem right. I would understand it if the flap spring was going the other way (meaning: Springing number 37 open 100% and your electronic choke would in return close it 100%) But the spring want to spring it in the closed direction. So, no matter what position I have it in it just does not seem right to me? Any more guidance is much needed!!

Thanks,
Jessie"
 
"Now I'm confused, whiplas

"Now I'm confused, whiplash from looking down and up at 37. Thats the best picture I have right now. If you can wait I'll take a picture of mine and post it, or click on my name and I can email it to an address of your choice."
 
"ok, I send you an email if th

"ok, I send you an email if that is easier for you to send a pic. While we wait, do you recall if spring number 38 should be springing the flapper (37) open or closed?"
 
"Another thing about the sprin

"Another thing about the spring (38), on mine the other end of it is connected to behind the other spring (43). Is that correct? The drawling does not show the connecting spot for the other half of the spring (38)?"
 
"nevermind, I flipped the spri

"nevermind, I flipped the spring (38) over and all operates smooth now, manual choke is smooth, either 100% open or 100% closed, and the spring now make the flapper stay open 100% unless it is choked, then it goes to 100% closed. Thanks for you help on that problem so far. I did have another question about the trottle. Item number 15 seem to hit a stop about 1/2 throttle. This is with the engine off, when the engine runs does that valve automatically open more to pass that stop in order for you to get to full throttle?"
 
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