View Full Version : 1976 Merc 1750 #344 off the assy. line

07-25-2005, 03:48 AM
I've recently acquired a 76 Merc 1750 with an entire complement of spare parts thru an estate. I understand this is one of the very first V6 outboards built by Mercury. The powerhead is freshly rebuilt and has the original cowl and decals. There are several sets of spare heads with different cc ratings. Power trim and tilt has all new hoses and rams, 2 complete intakes with reeds, spare pistons, rods, bearings, etc. I also have 2 different lowers and some adaptor plates.

I'm not quite sure what I have here and I'd like some help cataloging, assembling and testing this motor before I sell it and the spares on Ebay.

Think anyone could help me out?

07-25-2005, 06:58 AM
Pictures would probably be the key element for best help:)

07-25-2005, 05:13 PM
If it's a production engine, I don't think you're gonna find big money in that engine from a collectible standpoint. There were a lot of em around and outboard collecting hasn't yet evolved into early/late serial numbers being relevant as they are in cars and some other collectibles.

Since you said lowers and adapter plates, could you be talking about a 1750XS? If so, then you may have something worth marketing to the collector market. Again, I don't think serial number sequence is very important, but originality of components and completeness would be.

07-25-2005, 08:36 PM
How can I tell if it's an XS? The cowl only says "1750". I'm not looking for big money anyway, I just want to sell it to someone who would appreciate what it is for a fair price, as I don't really have the room to store it. I'll try to get some pictures of it online tonight. As far as completeness, everything is there and then some. I know the original owner was a racing enthusiast and had intended this motor for racing.

07-25-2005, 08:57 PM
The 1750XS was a 12" race motor with a Speedmaster gearcase. It said 1750XS on the cowl with red stickers. The cowl was a one piece lift off as opposed to the clamshell type on production engines. The "adapters plates" in your original post made me wonder since the std engine doesn't use a lower unit adapter.

07-25-2005, 09:38 PM
Thinking of the serial number of a full race motor .... #344 race motor is a rather high number rather than a low number.

I'm sitting on pins & needles waiting to see the pictures :eek:

07-25-2005, 09:48 PM
Good point Sam. I'm pretty sure the total production of 1750XS/T3's never approached anything like 344.

07-26-2005, 05:33 AM
Here goes...

07-26-2005, 05:34 AM
Page 2. Sorry bout the mud all over it. I'll clean it up soon.

07-26-2005, 05:36 AM
Last page for now.

07-26-2005, 09:14 AM
Took a few more this morning...

07-26-2005, 09:15 AM
One more of the power head.

07-26-2005, 10:07 AM
That appears to be the standard Production 1750 engine. Please let me know if you split it up, I may be interested in the cowlings.

Also, the silver lower unit you have pictures is from an OMC engine, looks like maybe a 35-50hp or so.


07-31-2005, 05:38 AM
So should I rebuild it and keep it? Rebuild it and sell it? Part it out on Ebay? Junk it?

How many years did the V6 have sleeved cylinders? These are not chromed. Can anyone help me with wiring diagrams? Torque specs? Maybe some service manual pages scanned? Like I said, The block is fresh, but the rest is a basket case and I'm not too familiar with these motors.

07-31-2005, 10:12 AM
The cast iron liners in the 2 liter weren't a matter of years, but characteristic of the 2 liter engines. The 2.4's came with chrome bores when they were first introduced in 1978, but the 2 liters stayed with the cast iron. There have been a number of steel sleeved production V6's over the years including most of the non high perf 2.5's.

If you're gonna do anything with the engine the best money you'll spend is for a service manual. I think you'll find the factory manual a lot more helpful than the aftermarket ones if you can still get one for a 76/77 model 1750.

07-31-2005, 12:29 PM
I'm going to have to agree with you Raceman, a service manual is what I need. Since you guys love pictures so much I've chronicled where I'm at with this motor as of this morning. Maybe you guys can help me identify some of these parts, eg. the unpainted heads I'm assuming are Hi-Po?

07-31-2005, 01:07 PM
Here's some of the loads of spare parts I have:

07-31-2005, 03:30 PM
thats really cool bro!! and yes,a service manual would be a good idea for starters... i read through mine a number of times before i did something the next day to have it in my head already when i went to do it-- had the manual in front of me too... now i dont even need the manual except maybe sometimes i forget torque specs or something... i wonder if the older motors like that one had the big rods stock or if they were put in after the fact... anyways, good luck-- oh, and if ya wanna sell some of your spare parts let me know cause i might need a few things with this old 2.0 f1 champ motor i am getting and going to be putting together soon... -- sean

oh yeah-- and raceman is right about the factory manual being most likely the best... BUT for less then half the cost,around $25 to $30, a "seloc" manual has served me pretty well i must say... actually the mercury marina next door to me uses the factory and the seloc both because of simpler explanations sometimes in the seloc,at least thats what he(the mechanic and owner) told me.. hope that helps

07-31-2005, 05:19 PM
Today I found out that shaved heads require shorter head bolts!

I'm at the point where I'm gonna make this thing work just because it's got to be one of the COOLEST motors I've ever messed with! I applaud the fantastic engineering used to design these powerhouses.

07-31-2005, 06:07 PM
Today I found out that shaved heads require shorter head bolts!.

Not really. All you have to do is put flat washers on the bolts

08-01-2005, 07:48 AM
Raceman, my problem is the fact that I'm an engineer - a simple solution like flat washers is too easy. I won't feel comfortable unless I order a gross of something from the fastener supplier. Preferably grade 8, shiny, and gold colored . ;)

08-01-2005, 11:51 AM
Well, you could always chuck em up in a lathe and turn whatever you cut off the heads off the end of the bolts. That would probably make it even more complicated (enjoyable for an engineer) than simply replacin' em.:D

08-13-2005, 05:02 AM
An update for you guys;

I've acquired a whole stack of factory and aftermarket service manuals, blueprints, schematics, service tags, racing parts lists, price lists and much more for the 75-76 model years Mercury outboard engines.

Would any of you guys be interested in me scanning and posting some of this stuff up?

08-13-2005, 10:29 AM
I think everyone here would be interested in good scans of the racing stuff


08-13-2005, 05:55 PM
I am interested in anything on the Inline-6's since I have a 1150 and a 1500

Soon will be getting a V-6 for the Hydrostream(I hope).

08-15-2005, 10:53 AM
I would be interested in Good scans of the V-6, inline 6 and racing stuff from that time frame.

08-15-2005, 03:13 PM
Awesome! I'll fire up my scanner tonight and start sorting thru what I have.

08-15-2005, 04:46 PM
Well, you could always chuck em up in a lathe and turn whatever you cut off the heads off the end of the bolts. That would probably make it even more complicated (enjoyable for an engineer) than simply replacin' em.:D

Hmmmm, maybe that's my problem 'eh? :eek:

08-20-2005, 03:42 AM
I've only just begun to delve into the wealth of documentation I have. Here's a few scans to whet your appetite.

08-20-2005, 03:45 AM

08-20-2005, 03:46 AM
And more...

08-20-2005, 03:54 AM
The last 2 for tonight. Tomorrow I'll attempt to scan the Hi-Po parts and price lists.

If anyone is interested in any specific info regarding the 1750 or hi-resolution scans of this stuff, just ask via PM and I'll see what I can do.

08-21-2005, 04:51 AM
Hi-Po Price List:

Page 1


08-21-2005, 04:53 AM
Page 2:


08-21-2005, 04:53 AM
Page 3:


08-21-2005, 04:54 AM
Page 4:


08-21-2005, 04:55 AM
Page 5:


08-21-2005, 09:21 AM
http://forums.screamandfly.com/Gallery/data/503/Engine_Specs_2_Large_.jpghttp://www.screamandfly.com/Gallery/data/503/Engine_Specs_2_Large_.jpgLet me try one:http://www.********************/forums/attachment.php?attachmentid=6262&stc=1