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Author Topic:   Mercury 90 Four Stroke Saltwater vs Non-Salt
Barney posted 07-24-2003 07:50 PM ET (US)   Profile for Barney   Send Email to Barney  
I now have my trusty parts catalog and service manual for my 90 HP Mercury Four Stroke (2004) non-saltwater. In the parts catalog, I came upon several decal sets including a saltwater decal. That led me to believe this catalog covered saltwater and non-saltwater. Searching for the differences, I found only that there are two versions of the tilt tube and nut, stainless and non-stainless. In your experience is this all the parts for saltwater service? I run in saltwater some and I am curious about the longterm performance differences of the two. Thanks B...
Jarhead posted 07-24-2003 09:16 PM ET (US)     Profile for Jarhead  Send Email to Jarhead     
The difference is the saltwater is a 25" and the other is 20".
Dick posted 07-24-2003 09:28 PM ET (US)     Profile for Dick  Send Email to Dick     
The 90 saltwater is available in both 20" and 25", the standard is only available in 20".
To my knowledge the tilt tube and nut are the only difference.

90ELPT 4 stk 20" MSRP $8,063.00
90ELPT 20" 4 stk saltwater MSRP $8151.00
90EXLPT 25" 4 stk saltwater MSRP $8.184.00


Barney posted 07-24-2003 09:29 PM ET (US)     Profile for Barney  Send Email to Barney     
Jarhead, Thanks from a Seabee, learn something new everyday. I see the 25" and 20" parts differences now also in the catalog. A friend of mine has a pair of 5 year old Honda 90's on his boat in constant salt spray. Rust is appearing at the steering connection area. B...
Barney posted 07-24-2003 09:33 PM ET (US)     Profile for Barney  Send Email to Barney     
Thanks Dick, looks like I could replace those parts with stainless if they give me trouble later. From reading ing here some folks have been getting the saltwater engines on the new Montauk I think. B...
Dick posted 07-24-2003 11:08 PM ET (US)     Profile for Dick  Send Email to Dick     

Here are some part numbers for you.
SS tilt tube #826125A1 MSRP $113.30
SS nut #11-826135 MSRP $7.65


Barney posted 07-25-2003 07:00 AM ET (US)     Profile for Barney  Send Email to Barney     
Thanks Dick, B...
John O posted 07-25-2003 02:00 PM ET (US)     Profile for John O    
I spoke with a Merc employee via their 800 # and he said that there was little diference between the Salt Water Series and Fresh. I have an '01 75hp 2 stroke which I believe was never offered in the Salt Water Series.

It would make sense to replace the Nut and Tilt Tube down the road if they do rust.

Barney posted 07-25-2003 06:01 PM ET (US)     Profile for Barney  Send Email to Barney     
John O, You should be able to change this out on yours too if the case arrives? Would it be the same part on the Saltwater 90 2 Stroke? Curious. B...
Taylor posted 07-25-2003 06:23 PM ET (US)     Profile for Taylor  Send Email to Taylor     
Having just found a few seriously rusty parts on my older Merc - can you check parts list for the studs that hold the lower unit, and the ones that hold the mid unit to the power head. These strike me as likely stainless candidates for saltwater. I'm pretty sure the lower unit studs on mine where replaced after the fact with stainless.
newt posted 07-25-2003 08:41 PM ET (US)     Profile for newt  Send Email to newt     
I was asking the same question about a year ago, although in the 2stroke variety. I asked dealers and then Mercury customer service several times. Everyone had a different answer. The range was "nothing at all" to "the decal" to "All stainless and different coatings on the parts".

I eventually searched the diagrams and parts lists online at Mercurypartsexpress, and came to the conclusion that there are only a couple of differences in the motors. The saltwater version has

1. Decal
2. Tilt tube
3. (2) nuts at ends of tilt tube.
4. Coastal flush attachment (not 100% about that one).

Hope that helps.

Dick posted 07-25-2003 09:44 PM ET (US)     Profile for Dick  Send Email to Dick     
John O

The stainless tilt tube and bolt numbers I listed above for Barney will also fit your 75


John O posted 07-26-2003 11:25 AM ET (US)     Profile for John O    
Thanks Dick, Part #'s help a great deal.
Jarhead posted 07-26-2003 12:27 PM ET (US)     Profile for Jarhead  Send Email to Jarhead     

I have a 115 4s Merc that I plan on using in saltwater. There's no greese fitting on the steering arm near the tilt tube. I've heard I can buy a replacement nut for the tilt tube with a greese fitting [greese buddy?].

Can you help with the correct name and
maybe a part #?


Jarhead posted 07-28-2003 08:43 AM ET (US)     Profile for Jarhead  Send Email to Jarhead     
Dick posted 07-28-2003 09:27 AM ET (US)     Profile for Dick  Send Email to Dick     

Here is the info that you are looking for.
For the key word type in Steering Guard.
Click on the illustration for a larger picture and details.


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