1150 Reverse latch

[gregtobin]

I finally took my new-to-me 74 1150 to a mechanic for a couple of things. He noticed that my motor is missing a latch/clasp that attaches to the trim rod when it is put into reverse so that the motor isn't thrown back into boat on a hard reverse. Says that he has a boat in the shop that flipped its motor and cracked the transom which led to the boat sinking. I saw how this works on a similar motor - there is a rod that comes out of the lower end and actuates a latch mechanism when the engine is put into Reverse. I have no idea why a previous owner removed this.
Does anyone out there have a parts motor for scavenging? What is the real name for this part?
I'm thinking of rigging up a chain to prevent the motor from tilting back - any reason not to do this?

And, I am still not familiar with the engine terminology. I have seen tilt/trim assemblies for a Mercury Mariner on ebay (came from an 89 85hp Merc). Will this work OK on my 74 1150 115hp inline six?

Thanks
Greg

 

[Plainsman]

Re: 1150 Reverse latch

It's called a tilt pin.
You could make one out a piece of threaded bar and put nuts and lock washers on it until you can find the part.

 

[diaric]

Re: 1150 Reverse latch

I have the same problem with my 1966 merc 50hp. I'd be interested if someone had somesort of diagram they could post. I've looked in my manual and can't find any mention nor can I see how it was set up, except for the latch. My mechanic checked his parts motors and all of them had it broken off. Seems to be a very common problem.

 

[Plainsman]

Re: 1150 Reverse latch

 

[AMD Rules]

Re: 1150 Reverse latch

It sounds like he's not missing the tilt pin, but rather the latching mechanism itself. On units without power trim, that latch is the only thing that keeps the motor from kicking up in reverse, In forward of course that latch needs to be free to allow for the motor to swing up in the event you hit a submerged obstacle.

 

[AMD Rules]

Re: 1150 Reverse latch

The Latch:
70692 REVERSE LOCK ASSEMBLY
2429821 SPRING, REVERSE LOCK TENSION
56349 SHAFT, REVERSE LOCK PIVOT
1845882 COTTER PIN, REVERSE LOCK TO SHAFT

The push rod, in the drive shaft housing:
52887 GUIDE, PUSH ROD - REVERSE LOCKING
47591 ROD, PUSH - REVERSE LOCK(SHORT SHAFT)
47558 ROD, PUSH - REVERSE LOCK(LONG SHAFT)
1169254 NUT, JAM - PUSH ROD
47559 YOKE, PUSH ROD
1739023 PIN, PUSH ROD TO REVERSE LOCK
1825191 COTTER PIN, PUSH ROD PIN

 

[gregtobin]

Re: 1150 Reverse latch

Thanks! I do have the tilt pin, but not the latch mechanism. I'd like to get the parts before something really scary happens!

In the parts bin that I got with my boat, I found two hydraulic cylinders. They appear to mount in a bracket on the transom and on bolts on the side of the motor. My mechanic tells me that the motor did not come with power trim, but these cylinders are for making it easier to tilt the motor back for towing. However, the cylinders have two hydraulic lines each (they have been cut) and i see no reason that I can't install some kind of hydraulic pump to turn these cylinders into power trim/tilt. I realize that most power units for this motor are mounted under the motor between the transom clamps, but I could secure a generic pump in the transom and run lines to the cylinders. Then I'd need a controller and a trim guage.
Any reason not to try this? And if it seams a reasonable solution, are there any specifications on the pump that I should look for? Can I use a pump for any outboard or inboard?

 

[gregtobin]

Re: 1150 Reverse latch

I'm thinking here that if it might be a lot easier to install power trim rather than the reverse latch mechanism.
And, I would then have power trim!

 

[dhauser]

Re: 1150 Reverse latch

Hi Greg

I know I have a pdf regarding power trim for early 70's Mercs on a CD here somewhere, be glad to send it to you if it might help, just PM me an email address - I think it's a couple meg file...

 

[AEROCOOK]

Re: 1150 Reverse latch

It sounds like he's not missing the tilt pin, but rather the latching mechanism itself. On units without power trim, that latch is the only thing that keeps the motor from kicking up in reverse, In forward of course that latch needs to be free to allow for the motor to swing up in the event you hit a submerged obstacle.

 

[AEROCOOK]

Re: 1150 Reverse latch

It sounds like he's not missing the tilt pin, but rather the latching mechanism itself. On units without power trim, that latch is the only thing that keeps the motor from kicking up in reverse, In forward of course that latch needs to be free to allow for the motor to swing up in the event you hit a submerged obstacle.

I just upgraded my 1974 1150 to power trim and The latching mechanism is still on the motor. Are you saying that with the power trim the latch is no longer required?

 

[dhauser]

Re: 1150 Reverse latch

According to the pdf I have, the reverse lock mechanism is supposed to be removed when installing the power trim. My 850 (with power trim) doesn't have it. I recall a friend with manual tilt had to take his forward of neutral to lift it, so I was under the impression that it locked in both reverse AND neutral? If so, I would think you would have run into a problem already though...?

 

[AEROCOOK]

Re: 1150 Reverse latch

Mine hasnt seen water yet. I think I will have a look at it tonight and try to figure it out.

 

[Smig]

Re: 1150 Reverse latch

This may help you take it off.

 

[AMD Rules]

Re: 1150 Reverse latch

Greg,

Does yous motor have cylinders installed on it now? Either way you need the hydraulic cylinders -or- the shock absorbers. You shouldn't use it without one or the other. The shock absorbers do assist with manually lifting the motor, but are actually there to slow the violent swing movement of the motor if you happen to hit something while in motion.

If those cylinders in your spare parts bin have hose fittings they are meant to have the hydraulic power trim system hooked up. The reverse-lock latching mechanism is not required if you have power trim.

 

[gregtobin]

Re: 1150 Reverse latch

The challenge here seems to be constructing something workable using bits and pieces collected from various places including ebay sellers. Thank you all for your help on this. Smig - thanks for posting the manual.

Aerocook - did you buy the assembly as a kit or put it together with pieces? If a kit, where did you get it and about how much $?

The current state of my motor is that it has neither the reverse latch nor the shock cylinders. There are posts/bolts for the two shocks on either side of the motor, but the cylinders that came with do not fit exactly and they do have hydraulic fittings. I have picked up a $30 Merc trim pump and am considering how to adapt the current cylinders to my boat. It seems possible as the most obvious problem is that the end that fits to the motor is a little too wide (about 2 inches instead of 1.5). Maybe I can shim this enough and get a different bolt to hold it on. Then I'll have to figure out whether the cylinders offer the correct amount of up and down adjustment. I'll need to mount the pump in the transom and then drill some holes for the hydraulic lines. Seems like a wonderful little project....

Is there a reason that some motors have a single cylinder under the motor while others have two cylinders, one on each side?

Thanks
Greg

 

[AEROCOOK]

Re: 1150 Reverse latch

I actually lucked into mine, I went to look at a parts motor because I needed a new lower unit for mine and to my delight it had power trim complete with pump,lines switch etc.I drove for an hour on a snowy night in January to get it because he was only asking 100 bucks for it and I knew it wouldnt be there the next morning!
If you decide to go without PT (at least for now) let me know, I have all the parts left over including the reverse latch.

 

[Smig]

Re: 1150 Reverse latch

Greg,

You may be on the right track - the motor end of the trim cylinder should appear to be too wide - there is a spacer that goes in there it is 'l' in this diagram.

 

[gregtobin]

Re: 1150 Reverse latch

Smig-
I'll need to do something to shim the two outside cylinder mounting posts. Maybe add a piece of pipe or something. Do you have any idea how much stress this part is under? I'll want to make the shim strong enough, but not go too crazy here.

Thanks
Greg

 

[Smig]

Re: 1150 Reverse latch

I don't know how much stress there is, but since there are nylon bushings around the spacers (item 'k' in the diagram posted in my other post) I would guess they are there to keep the bushings from being crushed by the bolt.

I measured mine and it looks like the spacer is brass, 3/4" long x 1/2" o.d. x 5/16" i.d.