motor tilt will bounce/stutter last 50% of travel

[tvtech]

My 93 200 Johnson will bounce on the last 50% of travel down in the TILT mode. Trim is fine. Tilt up is good. I have the OEM manual and the travel time is within specs. I'm worried about my transom

Here is what I have done. Greased the bejeebers out of the two grease fittings on the tilt tube. Backed off and retorqued the nuts to spec and backed off the starboard nut 1/4 turn.

Raised all the way and topped off the hydraulic to the top and repeated the up and down maybe a couple of time filling up the the oil to overflow. (GM Dexron II)

I noticed first time I did the fill thing it spit out a little fluid which looked to me "aerated" like lower unit oil when it gets air into it. Milky looking.

It seems that when I do all the above in the workshop it fixes it. I go the lake, try to catch some fish, (bad year) and come home it starts acting up again.

Is it an air in system issue? If so how do I drain and replenish the fluid or am I missing something.

Thanks in advance.

 

[Bifflefan]

Re: motor tilt will bounce/stutter last 50% of travel

Raised all the way and topped off the hydraulic to the top and repeated the up and down maybe a couple of time filling up the the oil to overflow

Is that the proper way to fill yours? Most are filled with the cylinder fully retracted, not extended.

You may have an internal seal in the cylinder or pump going bad causing the issue.

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

No manual says fully extended (I guess tht means up)

 

[boobie]

Re: motor tilt will bounce/stutter last 50% of travel

Any T/T unit I've ever seen has to be filled/topped off in the full extended position. I shouldn't probably post this here but I have heard of techs putting 30 wt auto oil in them and it cured the prob that you have. Never tried it myself tho'.

 

[Chris1956]

Re: motor tilt will bounce/stutter last 50% of travel

Nick, Fill it with ATF in the full up position, as you have been doing. Run it down and then up again. Now wait a few minutes (like 10min) for all the air to bubble up, and then refill. Repeat several times.

If that doesn't fix it, repost, and we see what we can do.

 

[Joe Reeves]

Re: motor tilt will bounce/stutter last 50% of travel

I've encountered that problem quite a few times in my shop, and in every case it has been that the piston within the tilt tube is sticking, scuffing, jamming within the tube in the down mode. The cure was to replace the tilt tube assembly.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

Thanks Gents,

I'll go with the hydraulic top of procedure first (cheaper!) and then look into the tilt tube.

When you say tilt tube do you mean the Cylinder Valve Assembly? PN 987033? If so where can I get one?

Thanks to all. I'm going to know this new boat beter than my Powerstroke before I'm through

 

[jonesg]

Re: motor tilt will bounce/stutter last 50% of travel

Corrosion in the pivot tube can do this, shuddering on the downward stroke only.

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

It's beginning to look bad. I raised topped off fluid, and cycled around 7 8 times, frankly it took little or no extra fluid except what I spilt. and I still have the intermitent issue.

I'm thinking hydraulic assembly could be bad. Maybe a pistion or seal.

My only other thought is the tilt goes an awful long way up to the point where the hydraulic steering lines are severely bent in the transom well. In reading the OEM manual it says I can adjust the tilt up. If I do so that it does not go so high could it help the problem?

There is no binding of the midsection, I temporarly loosened the pivot tube way less than the recommended torque, same issue.

I'm stumped. The Johnson parts list says the part # for the hydraulic assembly is 434397. I googled it. Should not have. It comes in over a $1000.00. Can I get this one rebuilt if need be? I reckon from reading I could remove it but probably out of my league to rebuild it.

I did put a new trim sensor in while I was messing around with this, works great. Now I don't have to listen to the thumps to guess where the drive is, the guage on the dash works

 

[Chris1956]

Re: motor tilt will bounce/stutter last 50% of travel

Nick, You might see if there is a repair kit for that PTT unit. The repair kit for my '98 Johnny 150 was $50, and contained all the seals and other rubber parts. Perhaps you can find the trouble after you disassemble the PTT unit.

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

Thanks Chris I will. Do I need special tools? Is it difficult?

Can't stand the thought of buying a new one

 

[levittownnick]

Re: motor tilt will bounce/stutter last 50% of travel

On my '97, 150 HP it was due to the battery not fully charged. It has been fine since then.

Good luck

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

Is there anyway to flush the PTT in order to replace all or most of the fluid. I thought of lowering the drive with the filler cap off. Then I thought I would ask first. The stuff in there is gray and airy. Hope it's not bits of seals (inanimate kind) The drive is coming down too fast in tilt down, trim is fine.

Someone suggested sae 30 oil instead of Dexron II. Thoughts?

 

[14ftgrumman]

Re: motor tilt will bounce/stutter last 50% of travel

You could drain it by opening the fill plug when down, then crackiing open the hoses tthe cylinders and letting the bad stuff out. Then start the fill, raise-lowqer, fill and cycle it 5 times and repeat as needed. Make sure that you keep the battery charged or have a booster pack handy.

I'd hesitate to use the trick I've used on motorcycle fork seals- Automatic transmission sealer. It swells the seals. But I would trry that as a last resort.My theroy on broke is that you can't break it worse. If that didn't work, then it's comming apart.

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

Trouble is I cant get to the filler when down and I see no external hoses on this. It's a self contained PTT.

 

[Chris1956]

Re: motor tilt will bounce/stutter last 50% of travel

Nick, If it is like my PTT unit, the resevoir unbolts. You could remove the unit (drive out the two rods), and remove the end caps and resevoir and the oil should drip out. I would stick with the ATF as it is thinner than SAE 30.

You may need to remove some of the wires from the connector, or it may not fit thru the transom clamp hole.

 

[tvtech]

Re: motor tilt will bounce/stutter last 50% of travel

Nick, If it is like my PTT unit, the resevoir unbolts. You could remove the unit (drive out the two rods), and remove the end caps and resevoir and the oil should drip out. I would stick with the ATF as it is thinner than SAE 30.

You may need to remove some of the wires from the connector, or it may not fit thru the transom clamp hole.

Thanks Chris, That is what I will do, and I agree with the ATF theory, I'll stick with that.