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Reverse lock problem 1984 7.5hp

D

donaldboyer

Contributing Member
OK, I have a 1984 7.5hp mercury (2cyl 2 stroke).

The 2 "claws" that engage when in reverse (to stop the motor tilting up under reverse power) aren't working. This is because the "pin/axel" (forgive my poor terminology) doesn't turn freely (or the claws don't turn freely on the "pin").

I have tried spraying it with WD40 to free it up but to no avail. I want to fix it, but not sure where to start (or even how to take it apart!). I cant see any cir clips to take the pin out? Can someone please provide me some direction here??

Please note:
I can move the claws by hand but they are very stiff. They are not completely siezed.
The linkage from the "claws" to the reverse lever assembly is intact, but it connecting rod just bows as the claws arfe too stiff for it to work.

If you need more info or pics of the motor, please ask.

Thanks,

Donald
New Zealand

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Re: Reverse lock problem

That pin is just "drifted" in there - originally there would have been a nylon bushing on each end that would prevent it from getting corroded into the bracket.

It looks like the bushings are long gone.

Similar to tilt pins (thrust rods) that have "become one with the bracket", a torch, a big hammer and a punch are the only way I have had success getting them out.

Since you still have some movement in the assembly, once out you need to clean up all the pitting on the rod and clean the crud out of the holes it feeds through and then really gob it up with a decent grease that contains either lithium or teflon (high speed bearing grease works well).

Good luck getting the pin out, it can really try your patience (but often leads to new "engineering" techniques) :)
 
Re: Reverse lock problem

Bugger!!

OK, I don't have a blow torch or anything like that. But I am safe to try the hammer & punch without one?
 
Re: Reverse lock problem

Yes, you can give it a try. Products such as "liquid wrench" or "release-all" may help.

You still may find that you need some heat. Just one of those little propane torches that plumbers use would be sufficient if she won't move just by (whaling) on it with a hammer..
 
Re: Reverse lock problem

OK, I have tried hammering this damn pin out, with no luck. I have noticed that the pin has about 4 mm movement long ways but stops abruptly like it is being retained by a pin or cir clip somewhere.

Can some one point me to one of those exploded diagrams that are around, for this motor?

Thanks,

Donald
NZ
 
Re: Reverse lock problem

OK, I have taken a close look at the reverse lock on this motor, the actual reverse lock lever (part #25) http://www.usboatsupply.com/Mercury_Mercruiser_Parts_Catalog3a.php?mc=01&ms=900&si=297 is stuck to the pin.
So going back to the blow torch to heat the part.... I have a small butane torch I use for soldering and heat shrink, would that be sufficient? Do I just heat the part where the lever and pin meet and then try to hammer the pin through?
 
Re: Reverse lock problem

Instead of trying to remove it, just heat the stiff areas up and drizzle engine oil into the area that needs freeing up. The heat helps draw the oil in and also helps to expand things a little, allowing the oil to flow. I personally would leave it well alone and just get it working better, broken castings are far too common on older outboards, why risk it?
Another trick is to drill a hole right into the affected area and inject oil directly, you can even drill and tap for a grease fitting IF you have enough metal and can keep the swarf out.

Regards, Andrew.
 
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