Oil for PTT unit

two stroke mick · 09 January 2017, 13:36

I am in the process of changing oil seals in the PTT unit. A review of the e-tec manual says that an evenrude type oil should be used to avoid damage to the seals. I intend to use ATF fluid as a hydraulic ram is a hydraulic ram irrespective of weather it is on an OBM or a track machine. What do you think?

TSM

breezeblock · 09 January 2017, 13:50

I would do the same I wouldn't think a ptt would see the same load and heat as a digger

Searider · 09 January 2017, 14:59

Quote:

Originally Posted by breezeblock

I would do the same I wouldn't think a ptt would see the same load and heat as a digger

And that's the point - often "marine" oils have additives to deal with moisture ingress.

Hot hydraulic oil recirculating around a digger hydraulic system will be dried of any moisture ingress.

I'd look for any branded outboard or sterndrive PTT oil.

jyasaki · 09 January 2017, 17:49

I kind of doubt that marine PTT oil is anything other than standard hydraulic fluid. Its purpose is simply to be non-compressible (as is water.)

Lubricating oils (crankcase oil, lower unit gear oil), yes, having something that emulsifies the water into the oil and keeps some lubrication there is a good idea.

Note that this is a guess; don't have any proof of this.

jky

tamsbairn · 09 January 2017, 18:05

Quote:

Originally Posted by two stroke mick

I am in the process of changing oil seals in the PTT unit. A review of the e-tec manual says that an evenrude type oil should be used to avoid damage to the seals. I intend to use ATF fluid as a hydraulic ram is a hydraulic ram irrespective of weather it is on an OBM or a track machine. What do you think?

TSM

Mick dont used TQF/ATF steering oil in place of hydraulic oil as hyd oil has special wear preventing additives you could use the Citroen hydraulic/steering LHM oil would work fine or regular hydraulic oil from a motor factors
Stewart

beamishken · 09 January 2017, 21:42

I've used light engine oil 10/40 or 5/40, atf and hydraulic oil and they've been fine, at the end of the day it's a hydraulic motor and a couple of rams nothing special as long as you don't mix synthetic and mineral you'll be fine put in what you have on the shelf

beerbelly · 10 January 2017, 06:57

I have used car power steering fluid with no problems at all

tamsbairn · 10 January 2017, 14:44

You could use water washing up liquid brake fluid or almost any fluid as they don't compress, why make a product specifically for hydraulics if you can just use any old oil ? Yes you could put other oils in and it will work.
I'm just saying like
Stewart

two stroke mick · 10 January 2017, 15:12

Quote:

Originally Posted by beamishken

I've used light engine oil 10/40 or 5/40, atf and hydraulic oil and they've been fine, at the end of the day it's a hydraulic motor and a couple of rams nothing special as long as you don't mix synthetic and mineral you'll be fine put in what you have on the shelf

What is the problem with mixing the two types of oil?

TSM

tamsbairn · 10 January 2017, 15:22

TSM you can end up in all sorts of bother with slugging separation advanced seal failure
Plus being out in the water you would be better with a biodegradable hydraulic oil

Pikey Dave · 10 January 2017, 17:11

The Etec manual does state that the oil is biodegradeable.

beamishken · 10 January 2017, 17:41

Mineral and synthetic oils don't mix well so best avoided neither should damage seals but I'd avoid mixing them
Unless you want to use the liquid gold biodegradable stuff in case you get a leak and poison a few fish

spartacus · 10 January 2017, 21:21

Just order the right specification oil. I'm sure Evinrude engineers specify particular grade oils for a reason.

I fixed the trim unit on my Tohatsu and used Mobil 220 ATF because it's a Dexron II D equivalent. Still carry a large screw driver on board in case it ever lets me down and I need to use the emergency trim release.

beamishken · 10 January 2017, 23:45

Quote:

Originally Posted by spartacus

Just order the right specification oil. I'm sure Evinrude engineers specify particular grade oils for a reason.

I fixed the trim unit on my Tohatsu and used Mobil 220 ATF because it's a Dexron II D equivalent. Still carry a large screw driver on board in case it ever lets me down and I need to use the emergency trim release.

Yeh cos they sell it at over inflated prices [emoji6]
Was your tohatsu spec'd for atf? Or did you take the cheap option (which I guess is working)
If it wasn't spec'd for atf then why shouldn't the op use it in his engine if it's working in yours?

diver 1 · 11 January 2017, 00:51

I'm using ATF on my Suzuki no problem. I'm sure the Suzuki dealer advised it when I bought the new seals (old ones had perished through lack of use)

spartacus · 11 January 2017, 18:13

Quote:

Originally Posted by beamishken

Yeh cos they sell it at over inflated prices [emoji6]
Was your tohatsu spec'd for atf? Or did you take the cheap option (which I guess is working)
If it wasn't spec'd for atf then why shouldn't the op use it in his engine if it's working in yours?

Tohatsu ship 2-stroke outboards (M60-70C) filled with Nisseki ATF Dextron. They recommend draining the entire system and refilling with approved fluid which includes Mobil ATF 220 rather than mixing if any overhaul work has been done.