Lower unit install 650 4 cylinder.

[sutor623]

Ok guys I know you have heard this question before. There is a little metal bar that comes down in front of the cam shift shaft on the motor. Where does this get put when the lower unit is slapped back on? I put the unit on and all seemed well (I had the motor and lower unit in neutral when I installed) Neutral is neutral, forward works well, and then no reverse at all. The shift lever seems to "pop" into place(when putting into reverse) and then the motor just stays in neutral.
Another issue is this, I cleaned the tell tall hole all up, and when the motor is running (with the muffs) water is coming out of the exhaust as it should, but barely any water is coming out of the tell tale. I think that I may have flushed some more gunk into it, or is it supposed to barely flow unless the boat is in actual water?

Thanks guys!!

 

[sutor623]

Re: Lower unit install 650 4 cylinder.

Anyone?

 

[Texasmark]

Re: Lower unit install 650 4 cylinder.

I need a picture of the "little metal bar in front of the shift shaft". You apparently have crud in your pee system somewhere. On muffs as in the water, water should come gushing out, unless you are plumbed off the output of the thermostat and I don't think your engine has one...didn't put them in until the late '70's early '80's as I know of.

Merc uses a twist shifter whereas there is a 3 position cam in the lower unit which moves the parts therein from a forward position thru a center position, thru an aft position.

Grasping the propeller and with a pair of vise grips on the shift shaft coming up out of the lower unit (vise grips lock in place and give you a free hand)......there are 3 detents: F is where the prop will lock onto the drive shaft in one direction and ratchet in the other; N is obviously N as nothing turns but the drive shaft, and R has detents and you have to carefully turn the prop as you move the shifter as this gear is straight sided and you have to get the protrusions and slots lined up really close and then it will go into R.

Work it with the lower unit down (so that you can work the shift shaft) or off the mid section for the same reason. Come back with with what you find.

Hth,

Mark

 

[carholme]

Re: Lower unit install 650 4 cylinder.

I think the metal rod you are referring to might be item 20, Push Rod as seen in this link:

http://www.crowleymarine.com/mercury-outboard/parts/450_15.cfm

It's purpose when everything is setup properly is that when you select reverse, the claws, item 46 in the following link, will grab the pin, item 12, preventing the engine from rising up.

What is the s/n of your engine?


http://www.crowleymarine.com/mercury-outboard/parts/450_14.cfm

The rod passes down through the nose of the leg and through the guide to rest on top of the cam system which rotates when you select gears and reverse causes the rod to push upwards, rotating the claws and locking the engine.

You should be able to see this if you have somebody select reverse for you. If it does not happen, you will be dropping the lower unit to ensure that the cam mechanism is set correctly.

Gerry

 

[sutor623]

Re: Lower unit install 650 4 cylinder.

Thanks guys, for all your input. Tex, I actually changed the gears from F-N-R before I even put the lower unit on, and they work very well. When I spin the drive shaft clockwise the gears act as they are supposed. And I had to clean out the tell tale hole a few times with the motor running and I finally got a nice thick stream, so thanks for that!!

Car I think you are right, it is a spring-loaded push rod. I think that it has something to do with reverse lock.

Now here is the very VERY odd thing. I don/t know if maybe my linkage is loose or what, but when I went back out there, luckily before I dropped the L/U I started her up. Viola, F-N-AND R all worked, and I tried them all about 30 times. I guess I will have to see how consistent that is.

Now I have two other issues at hand. When I use the throttle control, the motor does not change its speed until the lever is 1/2 way forward, and then the engine speed changes accordingly. When I move the lever, it takes about 10 seconds for the motor to react. I have NO experience with the shift/throttle module, so I am wondering if this is normal. Do I need carb work, throttle linkage checked, or what else would you guys suggest? Thanks again for all of your input. You guys ROCK!!!!

 

[sutor623]

Re: Lower unit install 650 4 cylinder.

Oh and the motor is a 1967, SN is 2206429.

 

[carholme]

Re: Lower unit install 650 4 cylinder.

Here is the parts listing for your s/n:

http://www.crowleymarine.com/mercury-outboard/436.cfm

Here is a condensed version of a service manual to assist you, allow the page to load for 20/30 seconds:

http://web.ebscohost.com/serrc/pdf?...b455-53a24bb2eea4@sessionmgr104&vid=4&hid=113

Is this engine new to you or have you been running it previously and if so, were you able to get WOT?

The easiest thing to check first is to ensure that the cable is operating correctly. Disconnect the shifter cable at the engine end and with the selector in any gear, push/pull on the cable end to see if there is play in the cable or possibly broken. As well check the outer sheath of the cable along it's length to ensure that the cable has not erupted through the sheath.

Is this the type of control box you have?

http://www.crowleymarine.com/mercury-outboard/parts/640_28.cfm

Gerry

 

[sutor623]

Re: Lower unit install 650 4 cylinder.

Okay Gerry, sounds like a good place to start. That is in fact the control box that I have. This engine is new to me so I have not gotten a WOT run on it before, but I will get a tiny tach (or use a guitar tuner) to see where my idle is at right now. Thanks for all of your input thus far!