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Mercruiser Outdrive ID help.

L

LX Kid

Regular Contributor
I've had so many opinions of my outdrive and would like to "nail it down" as to "exactly" what I have. First it was ID'd as a Pre-Alpha, then Alpha, then MC-1, then I, them MR and on and on. I have the number off the port side of the upper as best I can read it. 61855?8 with large "8" in upper right corner. Has the hook on top and lower has a squared off plate at rear.

20160413_121122_resized_zpssydefhnb.jpg
 
MC1 is rounded at the trim tab, R is square at the trim tab
BUT it could also be a Alpha1 lower unit on a MC1 upper but the old style rams were not used on Alpha1`s so I would go with the R type drive
 
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Just found another site with download repair manual which ID's mine as a MCM 120 thru 260 outdrive. Now the lower is another kettle of fish I guess. Mine has the square trim tab so lower may have been replaced over the years at some point.

Mercruiser Service Manual #4.
 
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What was the drive that used a marine transmission for shifting? My buddy had one of those in his Sea Ray and I liked it a lot.

Jeff
 
fastjeff said:
What was the drive that used a marine transmission for shifting? My buddy had one of those in his Sea Ray and I liked it a lot.

Jeff
Click to expand...

Ayuh,.... The TR, 'n TRS drives,....

All of the MC-1s are pre-alpha, 'n the 898, 888, 120, 260, etc are still all MC-1s,....

The drive in the picture is an MC-1,.... The liftin' eye in the top cap is the give-away,....
 
No, the lifting eye is not the give away.

R drives had the lifting ring also.

TR and TRS is NOT your drive they are F'n huge....pre Bravo and direct drive no shifting, they use a transmission behind the motor like an inboard.

Because yours is a 1982 boat then the drive would be late 1981 or 1982 depending on build date.

So it is a 228 drive based on the 228 motor, not sure if it is a MC 1 or R.

The only way to tell would be the lower gear housing vertical driveshaft bearing cage. in the older drives, pre alpha they used 13 rollers, r, mr and alpha's used 18 rollers. Also the water pump base and I think the housing are different. Definitely the water pump base.

If I remember correctly..............

so if you lower is an MR or Alpha the current water pump housing and base is ALPHA 1 GEN 1 style.

MR and Alpha lower drives assemble different, the vertical drive shaft bearing is held in place by a retaining nut under the water pump base.

R drives and earlier models there is no retainer under water pump base.

So there are some identifiers

It is not as simple as saying it is one drive or another based on its looks............

And there are other identifiers also

So you may have a MC-1 or R upper and a MR or Alpha lower.........

Having the alpha/MR lower is better. Better lower drive. parts are readily available.
 
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The link does not work... the stars or asterisks don't change when clicking on the link you posted....

maybe type the whole thing
 
kghost said:
The link does not work... the stars or asterisks don't change when clicking on the link you posted....
maybe type the whole thing
Click to expand...

I tried it twice and it still captures the link and puts the ***** into it so it won't work. ????

Try this and look up the Merc stern drive manuals. Try searching "boatinfo" and look up the manual.

Or do a search for the Mercruiser, MCM 120-260 Stern Drive.
 
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I have that link already,

I posted it in another post for someone else and I think the same thing happened.

What numbered manual is it??
 
If anyone is interested to know... The asterisks (***) are from boat info .com which hosts a bunch of Marine service type manuals and the reason this website prefers to blocks them out automatically is due to the hosts of this site (Marineengine.com) sells service manuals and would prefer their parts retail store sell a service manual vs allowing one to be just given away so "easily" at no charge to just about every forum member that comes/joins up....Plus the real fear of being harassed by the copyright laws which iboats forums has been down that road in the past and they themselves prefers the same avenue of not wanting them posted all over the boards....Which in turn unfortunately makes it harder for us that likes to try and help "show" members what needs to done correctly by way of service manual.:(

As a starting point, Knowing the engine model and close enough drive serial number, Here would be the parts catalog for the for the stern drive....At least the upper drive shaft unit anyway.
http://www.marineengine.com/parts/mercruiser-sterndrive-parts/228-19781892/4898730-thru-6225576

http://www.marineengine.com/manuals/seloc/mercruiser.html
 
Ok

manual # 4, I have this manual in PDF soft copy already

I drive... 13 pin roller bearing in lower if you had the original.

regardless, The correct parts structure is this one I posted earlier.

http://www.marineengine.com/parts/mercruiser-sterndrive-parts/228-19781892

This will cover the UPPER gear housing but you need to identify the lower.........only way is to remove it and remove the water pump base and see how it is assembled with or without the threaded bearing retainer nut below water pump base. With the threaded bearing retainer its a MR or alpha Without it could be a R...
 
TR and TRS is NOT your drive they are F'n huge....pre Bravo and direct drive no shifting, they use a transmission behind the motor like an inboard.
Click to expand...

Ayuh,.... I quoted Jeff, 'n answered his question 1st, is why TR drives were mentioned,....

I didn't say, or intend that the Op's drives are TRs,....

They're some incarnation of MC-1 drives,...
 
And yet another type from my Seloc Repair Manual. They indicate it's a Type 1. Be nice to have a single definitive model indicated for a particular serial numbered outdrive.
 
This morning I pulled the outdrive and find that I'll need a gasket set. Would "most" contributors feel that my upper is an MC-1 which I think in the same thing as a Type I upper? I have water mixing with the 90w in the drive bellows.


20160506_082329_resized_zpshxxoei3p.jpg
 
It does not matter what the upper is............get past this...........

you need to have the entire drive serviced by a professional at this point. He will put the correct parts in and let you know what you have,

You might want to check that gimbal bearing for smooth turning (there is a grease fitting at 4 o'clock on the transom assembly for this bearing, it requires at least ten to 15 shots of grease high speed bearing grease each and every 50 to 100 hours of use and if replaced the new ones are non serviceable (sealed) and no grease is required)

if it is not smooth REPLACE IT!!
 
As I mentioned in my other thread a Marine Service is going to replace the seals for me but I need to supply the parts for him.
 
(Seems like I had another post before this one, couple days ago, with more pics but didn't show up!)
 
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