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  Installing Power tilt / trim

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Author Topic:   Installing Power tilt / trim
Clay posted 03-31-2003 12:57 PM ET (US)   Profile for Clay   Send Email to Clay  
The tilt assist cylinder is inoperative on my 1992 Johnson OB motor. I am contemplating installing a CMC power tilt/trim unit. Will this unit replace the defective tilt assist cylinder, or will I need to replace the defective part in addition to the CMC T/T unit. Also, is the CMC T/T easily installed. Thanks!!
Florida15 posted 03-31-2003 05:53 PM ET (US)     Profile for Florida15  Send Email to Florida15     
Clay, I am no expert on the CMC but I do have one on my boat that was on there when I bought it. Looks to me like you would just leave the old cylinder on there because the CMC has it's own. You mount the CMC to the boat and mount the motor to the CMC.The aluminum bracket then tilts up and down. The motor remains stationary. Hope this helps.
DaveS posted 04-01-2003 09:30 AM ET (US)     Profile for DaveS  Send Email to DaveS     
Clay,

I'm just curious about the cost of replacing the cylinder vs. the price of the new CMC unit? One of my cylinders is corroded and I'll be looking at replacing it when it goes. I've thought about the CMC units but figured by the time things have been swapped out I'd be looking at about the same amount $ wise.

Clay posted 04-02-2003 09:13 AM ET (US)     Profile for Clay  Send Email to Clay     
The tilt assist cylinder currently on the engine is a manually operated tilt assist. It is not part of a power tilt/trim. You flip a lever forward when boating and this locks the engine down so it will not come back on you if you strike something underwater, or when using reverse. When trailering you flip the lever to the rear position and this allows you to manually raise the engine. The inoperative cylinder has lost it's hydraulic fluid and will not lock into position,therefore the engine can come out of the water creating a potentially dangerous situation. Would this still be the case if the engine was mounted to a CMC power tilt/trim with the old manual T/T cylinder still on the engine.
Florida15 posted 04-03-2003 01:52 PM ET (US)     Profile for Florida15  Send Email to Florida15     
Clay, even with the CMC , it's still nice to be able to tilt your motor up by hand if need be. When trailering, I put the CMC in the down position and manually tilt the motor up all the way.
What size is your motor ? Those CMCs are not cheap, somewhere around $500 I think. I don't know that I would put that much into a 1992 motor unless I was really attached to it.
acassidy posted 04-07-2003 02:53 PM ET (US)     Profile for acassidy  Send Email to acassidy     
Clay you are absolutely right about needing the Tilt assist working on your motor. All tilt and trim units and assist units are made to keep the motor from flying up if it hits a log or something. It will also make your reverse useless. This is a very serious thing and you do not what your wife, girl friend, buddy or kids chopped up by a motor in the boat. Having the motor locked down and having the CMC trim unit would do the same safety thing and would work fine. Is you motor a remote steering or tiller? What size boat and motor do you have? Installing the CMC trim would not be very hard. You will have to remove your motor. Install the CMC trim unit with motor mounting bolts and seal with something like 3M 4200. Then bolt your motor to the CMC unit. You will see a performance difference. New stock trim/tilt unit runs around $700 to a $1000 at the cheapest. Have you every thought of looking on ebay and getting a whole used tilt/trim unit for your motor. And for me spending a few hundred bucks on my 1991 motor while it is still running strong and having everything working right is better than spending $7000-$8000 on a new one. Good Luck Archie
Over the LINE posted 04-07-2003 03:21 PM ET (US)     Profile for Over the LINE  Send Email to Over the LINE     
If you have the motor I am thinking of (50HP)I do not think there is a way to "pin" the motor down, making it safe and making reverse work. I found a rebuilt power tilt at an outboard shop for around $500 (for an 89 SPL 48). From what I understand, the manual asist is not re-buildable. My mechanic had more trouble getting the old unit off than anything else (the pin had frozen in place). Good Luck
where2 posted 04-07-2003 05:44 PM ET (US)     Profile for where2  Send Email to where2     
The Tilt/Run lever is intended to perform the locking, not the hydraulics in the tilt assist unit. If you engine is not locking in the down position, replacing the assist unit will NOT correct the problem.

Do you actually have a tilt pin installed? (The little rod that adjusts the engine trim angle) Does the catch mechanism on the Tilt/Run lever appear to move when you switch it from Tilt to Run? Do you still have the intermediate spring, that attaches the two parts together? With the engine tilted clear of the water, on a trailer preferably, you should be able to see what moves, and whether it can do its thing, by flipping the tilt/run lever with the engine resting on the little feet that hold it up when it's tilted all the way up.

The tilt assist cylinder is intended to help you tilt up the engine, just like the little gas struts that hold up the tailgate on most modern SUV's and hatchbacks. As they loose their pressure, the engine is more difficult to tilt up manually. At no point was it intended to keep the engine from pulling itself out of the water in reverse gear. The trim/run lever has all the latching mechanism.

I know all this because I originally had a trim assist on my 70Hp Johnson, which I later removed when I installed the OMC factory Power-Trim-n-Tilt mechanism.

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