70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

[Peter105]

I have what I think is a 1976 70hp Evinrude (Model 70673D - Serial A312733?) & don't know where/how to put in fluid to fill up the power trim. I was told that the correct spot to fill it may be the screw on starboard side of cylinder about an inch & a half from the bottom?

But when I start to unscew this more fluid just comes out. Does someone have a diagram/description of where the correct spot to fill it is? If the spot described above is the correct spot, how do you get the fluid to stay in and do you do it with motor up or down??

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

You need to have the motor fully tilted up and supported, then remove the fill plug which is located as circled below.

Once the fluid is added to the bottom of the fill hole so that it starts to drain out, replace the screw and release the motor, then cycle up and down several times.

Repeat the whole process until no more fluid can be added.

 

[Peter105]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

Thank you for the advice but whenever I loosen/take fill screw out fluids keeps running out as if it is already full. But please see pic to see how much fluid was lost on the ground when the manual release screw was not fully tightened over night, there can't possibly be much left in there? Do I just let it all run out & then refill or could something else be forcing (pressure) what's left of the fluid to the fill screw?
Also do you know what the other screws (see pic) on the rear lower end of the Power Trim do.
Also it has a number 444889 engraved on the side, do you know if this is the part number as I have not been able to find it on any website for parts.
Thanks again.

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

That should not happen if the motor is fully tilted up and supported whenever you have the plug removed.

 

[Peter105]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

Just checked it again & yes fluid still runs out when screw is removed, until I replace it.
Yes the motor was fully tilted up and supported with a block of wood before the screw was removed.
Any ideas what to do from here?

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

Take a look at these two diagrams from OMC.

As you can see, the fluid should only reach the fill plug opening; more is too much.

The boat should be sitting on level ground when you work on this.

 

[RRitt]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

You may need to raise, lower, and raise again before topping off. You may also need to repeat the cycle several times. If the system is low on fluid then it still works perfectly but just doesn't go up all the way. If you are having some other problem then I doubt that adding fluid will fix it.

 

[adburton87]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

i have the same motor when i am in the water with the motor trimmed up a little and give it some throttle hard the motor will fall down and if i am running the boat maybe a little faster than trolling and the motor is down and i try to trim it up you can hear the trim motor run but the motor will not trim up any ideas is it just low on fluid or will i have to replace it any ideas would be greatly appreciated thanks andrew

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

To adburton87: There is no way to tell from here if you need fluid. You should check it, but read this entire thread again so you don't miss anything.

Both cylinders are needed to offset the thrust of the engine for trim and that is only for approximately fifteen degrees of the trim range.

The tilt range assumes that the motor will be operating at very low RPM or stopped.

 

[adburton87]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

to ezeke
please forgive my ignorence for the mechanics of boats i am a heavy equipment mechanic and operator and so far from my experience they are totally different so i havent checked the fluid yet i was just thinking that maybe this being on of the older units that maybe it not being able to trim up at high RPMs was normal but on the other hand i have seen bass boats bein trimmed up at pretty high speeds but one thing i am pretty sure of is that when you give it the throttle with it trimmed up seems to me it should not fall down like it is that is what leads me to beleive that is is either low on fluid or the unit may need to be replaced or maybe a seal kit may fix it so if you can think of anything else you might be able to add i would sure appreciate it thanks again Andrew

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

Here is the text from the factory service manuall regarding these PT&T units, click the thumbnail.

It was my experience that the units preform fairly well within the 15 +/- degree trim range, provided the battery was fully charged, the pump was filled with fluid, and the seals on the tilt & trim cylinders were in good repair.

 

[adburton87]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

to ezeke
thanks for the info i will check the fluid when i get the time

 

[madmedic]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

i also have a 1976 70hp, but without trim is there any way i can put trim onto the motor?

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

I simple conversion would be to use a CMC unit or similar; otherwise you will need to find a salvage unit with harness if you want original equipment.

http://www.iboats.com/CMC-Electric-...54687278--**********.789766625--view_id.38551

 

[RRitt]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

i also have a 1976 70hp, but without trim is there any way i can put trim onto the motor?

if all you want is to get on and off a trailer then you can simply replace your shock with a tilt cylinder. Trim is a whole different animal because the amount of lift needed to hold an engine at WOT is massive.

 

[mrcj001]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

That trim motor/pump unit on your 76 is not replacable. If it breaks you are SOL.

It is very difficult to remove the trim/pump motor on this unit.

It has a overload curcuit breaker inside of it. If the unit starts to fail it is most likley the cuiruit breaker. It can be by-passed, but you will need to fuse the motor at the battery. A electrical shop can rebuild the motor but not the pump.

Did I mention its a real ***** to get the motor/pump off??

I should have just taken the whole boat to the shop and have it rebuilt and worked on there instead of taking it off the unit.

The brushes and curcuit breaker is at the top of the motor where the big wire goes in.

 

[RRitt]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

That trim motor/pump unit on your 76 is not replacable. If it breaks you are SOL.

It is very difficult to remove the trim/pump motor on this unit.

It has a overload curcuit breaker inside of it. If the unit starts to fail it is most likley the cuiruit breaker. It can be by-passed, but you will need to fuse the motor at the battery. A electrical shop can rebuild the motor but not the pump.

Did I mention its a real ***** to get the motor/pump off??

I should have just taken the whole boat to the shop and have it rebuilt and worked on there instead of taking it off the unit.

The brushes and curcuit breaker is at the top of the motor where the big wire goes in.

not exactly true. you have three decent options
You can throw the calco in the trash and ....
buy the prestolite version of same ($600ish)
replace with a brand new volvo AQ290 ($200 plus plates, tubes, & fittings)
buy a used stringer pump, and have it rebuilt with a waterproof brush cap ($250ish)

You can also send your broken pump off and for $250 they will machine the reservoir to accept a more common $60 trim motor. This never made sense to me. You still have an old pump with dying valves. But hey, it's out there and it is an option.

It should be noted that the stringer looks like a 2w motor but it is really a 3w that grounds through frame. Blue and green are same as blue & green on outboard version.

I thought there was a way to lift and brace the engine so that the pumps were easier to remove?

 

[ezeke]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

Actually, the PT&T pump is on its own frame, so there is really no reason to separate the pump from the frame unless the pump is broken.

Also, I agree with RRit. If you seal a stringer pump so it won't leak, it will work fine and will bolt right up to the PT&T frame.

 

[EricJRW]

Re: 70hp Evinrude (1976) Power Tilt/Trim - How to get fluid in?

Take a look at these two diagrams from OMC.

As you can see, the fluid should only reach the fill plug opening; more is too much.

The boat should be sitting on level ground when you work on this.

Here is the text from the factory service manuall regarding these PT&T units, click the thumbnail.

It was my experience that the units preform fairly well within the 15 +/- degree trim range, provided the battery was fully charged, the pump was filled with fluid, and the seals on the tilt & trim cylinders were in good repair.

Those attachments are great. I would really like to see information like that for my 1993 50HP. Do they exist?

I am having problems, and don't know where to start.

Here's my thread: http://forums.iboats.com/showthread.php?t=430245