wiring harness 1974 85 hp outbard

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Chris1956

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Re: wiring harness 1974 85 hp outbard

The plate where the spark plugs screw into is the water jacket cover. If you remove it you will likely break a lot of bolts and not expose the pistons. Remove the two transfer covers on the starboard side of the motor, and you will see most of the cylinders, the piston tops, skirts and the top of the rods.
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

Thanks Chris1956
I don't recall seeing the tops of the pistons when I had the transfer covers off
I was able to see the side and the rods they all looked good
Like I said when I turn the flywheel if feels like one of the pistons hits something before tdc or a rod hitting on the lower end
Not sure how to tell the differnce
Maybe the camera thing that HF sells could tell me , Yes I'm a tool nut
I also don't like it when things stump me and I can see what is going on
At this point the good deal on got on this boat was not that good YET
Happy Haqppy Thanksgiving all
Larry
 
bgc

bgc

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Re: wiring harness 1974 85 hp outbard

Try poppin the flywheel off…
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

not sure what removing the flywheel will do , but I guess it can't hurt
I assume it has a keyway so it will only go on one way
Larry
 
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Chris1956

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Re: wiring harness 1974 85 hp outbard

Larry, The crank and flywheel have a "W" machined into each one of them. The inner flywheel cannot be put on wrong. Of course the outer flywheel has 8 bolts holding it on. Removing those would likely expose any issues.

Maybe the distributor is locking up? You might pop off the cap and see. The rotor is non-removeable and fragile and costs $200, so don't break it.
 
GA_Boater

GA_Boater

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Re: wiring harness 1974 85 hp outbard

Chris1956 said:
Larry, The crank and flywheel have a "W" machined into each one of them. The inner flywheel cannot be put on wrong. Of course the outer flywheel has 8 bolts holding it on. Removing those would likely expose any issues.

Maybe the distributor is locking up? You might pop off the cap and see. The rotor is non-removeable and fragile and costs $200, so don't break it.
Click to expand...


The belt pops off easy enough the eliminate a locking distributor and lessen the chance of damage to the rotor, etc.

Also, before removing the 8 bolts holding the outer flywheel, mark the inner/outer so it goes back together in the proper alignment.

The reason for removing the flywheel is to eliminate another rotating mass that has been known to cause the problem you're having in some situations.

Part of the problem when trying to fix a problem without hands-on and no idea if you have done all the things suggested. I'm not knocking you, but all we see are words.
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

well it never rains in So Cal until you need to work outside
Great day off and no work going to happen
Guess I could study the mercury manual , oh I did not buy it yet crap
Larry
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

Ok the flywheel nut is off and the fly wheel is off the spline , now how do I remove the belt to get it all the way off ?
Larry
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

ok, the flywheel if off and it still only turns 180
It must be something in the crank case
So I need to remove the power head , but I don't see the nuts of that
How do I see them the lower cover seems to be hiding them
Larry
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

Duh all you have to do is look , another cover hiding the nuts
Well the power head is off , but time ran out today
It is still only going 180 , Monday will pick up the manual from the boat shop and continue the learning process
Larry
 
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Chris1956

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Re: wiring harness 1974 85 hp outbard

Gee, Someone start a pool. "Predict the bad part" I vote broken connecting rod cap.
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

Chris 1956
At this point what else is there ? After work today I will know
Is there anything I should know about removing the pan or what ever it is called to see the bottom end or in a boat I guess it is the front end
Larry
 
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Chris1956

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Re: wiring harness 1974 85 hp outbard

It is the crankcase cover. Once you have the powerhead on the bench, it is an easy job. Try to keep track of where the bolts came from. Some are longer than others and some may have nuts as well.

As for the issue. I am guessing connecting rod cap. Another guess is that a bolt or rock or something fell into a cylinder thru the spark plug hole?
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

Ok got the crankcase cover off and I did not see aything wrong
All rods and pistons look good and are tight , no broken parts
After messing with it I got it to rotate , but I feel a small resistance at the same point each time
After I started to put the cover back on it got worse , not sure what to do now
Maybe it is time for the real boat guy to look at this
Larry
 
1960 Starflite

1960 Starflite

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Re: wiring harness 1974 85 hp outbard

Might try to loosen the rod bearing caps, just a little, one at a time, then turn the crank. Or it might be time to give yourself another engine for Christmas :)
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

can anyone recomend a good mechanic that can help me with this , I don't want to give up on this yet but I don't see what to do next
I'm in Norwalk Ca would like someone close
Larry
 
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Chris1956

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Re: wiring harness 1974 85 hp outbard

The recripicating portion of the motor needs to turn over smoothly. If the cylinder walls are smooth, and the rings intact, then the issue is in the rods, crank or bearings. Maybe a rod is bent and hitting the counterweights on the crank? You should be able to see it if you look carefully.
 
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sandhopper2

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Re: wiring harness 1974 85 hp outbard

Thanks Chris 1956
Total understand rotating smoothly , this is why I need a real mechanic
With the crankcase cover off and tapping with a dead blow on the end of the crank it seems to make it less of a drag
I don't see anywhere that it is hitting a rod and the walls that I can see look good
I'm not looking for someone to rebuild this , just tell me why the drag
I'm still learning , guess I picked a hard one to learn on
Larry
 
mercurymang

mercurymang

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Re: wiring harness 1974 85 hp outbard

Anyway you could post up a video of the "drag"?
 
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