82 50 hp tilt and trim

[redneck joe]

My motor drops slowly when on trailer and of course faster when under way. Are they semi universal and or how do I fine out what is compatible? Mine has a trailer heater, that does not work ans really don't care but would this work?

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[Chris1956]

If the motor pumps up under load, then the pump is probably fine. You probably have a bad control valve or leaking piston seals. Both will cause the cylinders to leak down.

Crowleymarine shows both as NLA.

As far as I know, the control valve is not rebuildable by us amateurs. The cylinders had a rebuild kit some years ago. It was a bunch of orings and a teflon piston seal. The piston seal required a special tool to install it.

Maybe you can find a used PTT unit and cannibalize?

 

[redneck joe]

If the motor pumps up under load, then the pump is probably fine. You probably have a bad control valve or leaking piston seals. Both will cause the cylinders to leak down.

Crowleymarine shows both as NLA.

As far as I know, the control valve is not rebuildable by us amateurs. The cylinders had a rebuild kit some years ago. It was a bunch of orings and a teflon piston seal. The piston seal required a special tool to install it.

Maybe you can find a used PTT unit and cannibalize?

if it is seals, gaskets are old so not sure cannibalize would work.

how could i test to see what the issue is?

To my original question would the link (or some other unit) work? I realize if the rams on the motor are leaking that is an seperate issue.

 

[Chris1956]

If the piston seal in the trim cylinder is bad, no pump will make it hold trim. Ditto for the control valve, although, I never had any issue with that item.

You may be able to find an old trim cylinder rebuild kit. It will take some looking. Then you will need to isolate the leaking piston seal to the correct cylinder. This can be done, with some plugs.

If the trim goes up when the motor is in gear and boat is on plane, the pump is likely good. Of course, if the trim cylinder piston seal is real bad, the leak could mask a good trim motor.

I always thought that the PTT cylinders on the 50HP motors were shorter than the ones on the 80/85/90/115/150 HP motor, which I know share trim cylinders. You would need to check this.

You might start investigating whether you could switch out the midsection and transom brackets on your motor for a newer one with the built in PTT.

 

[jimmbo]

My motor drops slowly when on trailer and of course faster when under way. Are they semi universal and or how do I fine out what is compatible? Mine has a trailer heater, that does not work ans really don't care but would this work?

Trailer Heater?
Your motor is dropping, so what is with the Transom Button Kit?

There should be plenty of 2nd Hand Parts/complete Systems available

 

[redneck joe]

Don't know how heater got in the sentence, was supposed to be trailer setting on the switch.

 

[redneck joe]

If the piston seal in the trim cylinder is bad, no pump will make it hold trim. Ditto for the control valve, although, I never had any issue with that item.

You may be able to find an old trim cylinder rebuild kit. It will take some looking. Then you will need to isolate the leaking piston seal to the correct cylinder. This can be done, with some plugs.

If the trim goes up when the motor is in gear and boat is on plane, the pump is likely good. Of course, if the trim cylinder piston seal is real bad, the leak could mask a good trim motor.

I always thought that the PTT cylinders on the 50HP motors were shorter than the ones on the 80/85/90/115/150 HP motor, which I know share trim cylinders. You would need to check this.

You might start investigating whether you could switch out the midsection and transom brackets on your motor for a newer one with the built in PTT.

Yeah everything works, just slowly lowers when on trailer and faster when on the water running so I'm going to go with the cylinders are allowing bypass.

I'll try to figure out a rebuild kit.

 

[jimmbo]

Have you got the Factory Service Manual? I used to have one for my Inline 6 and it had a Section for the Power Trim Systems. Included were Drawings of the Hydraulic Systems

 

[redneck joe]

This appears to be the one I need?

1982 MERCURY 50HP 4 CYL 2-STROKE OUTBOARD Factory Service & Work Shop Manual

Upon purchasing this manual, you will receive a .PDF file containing an email contact. After contacting us, you will receive a reply with a link to access the manual for your 1982 MERCURY 50HP 4 CYL 2-STROKE OUTBOARD. This comprehensive manual covers every aspect of your machine, providing...

www.emanualonline.com

 

[jimmbo]

Looking at the Table of Contents, to me, it looks like a Selock/Clymer Manual. My Factory Manuals

I would trust this manual far more

Mercury & Mariner 45, 50, 60 & 70 HP 3 & 4 Cylinder Outboard OEM Service Manual | eBay

Find many great new & used options and get the best deals for Mercury & Mariner 45, 50, 60 & 70 HP 3 & 4 Cylinder Outboard OEM Service Manual at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[redneck joe]

Thank you.

 

[redneck joe]

Looking at the Table of Contents, to me, it looks like a Selock/Clymer Manual. My Factory Manuals

I would trust this manual far more

Mercury & Mariner 45, 50, 60 & 70 HP 3 & 4 Cylinder Outboard OEM Service Manual | eBay

Find many great new & used options and get the best deals for Mercury & Mariner 45, 50, 60 & 70 HP 3 & 4 Cylinder Outboard OEM Service Manual at the best online prices at eBay! Free shipping for many products!

www.ebay.com

just ordered, glad it didn't sell.

It even had a pic of the manual open to the TnT section...