1647-5675 housing

**ivlakeman** · 12-05-2023, 05:53 PM

Click image for larger version.

Name: IMG_1978.jpg
Views: 28
Size: 124.5 KB
ID: 527510

I picked this thing up thinking to put a set of mercury gears in it but nothing fits it the number on it pulls up nothing on it 1647-5675 is it scarp are what

**tlwjkw** · 12-05-2023, 07:23 PM

i'd scrape it.. mainly cause it had ta have tha carrier pinned for some unknown reason....

**David - WI** · 12-05-2023, 08:32 PM

Did they ever "pin" them when they coned or rebuilt them, to prevent damage or only after the carrier spun?
I still have one coned case with the keyway torn out that I haven't tried to fix yet.

**Asstracker** · 12-05-2023, 09:26 PM

Originally Posted by David - WI

Did they ever "pin" them when they coned or rebuilt them, to prevent damage or only after the carrier spun?
I still have one coned case with the keyway torn out that I haven't tried to fix yet.

Pretty sure they're pinned after the damage. I dont recal ever hearing of anyone doing it for preventative reasons but i could be wrong

**ivlakeman** · 12-06-2023, 03:02 AM

Click image for larger version.

Name: IMG_1984.jpg
Views: 18
Size: 75.8 KB
ID: 527531

**ivlakeman** · 12-06-2023, 03:25 AM

The gears were bad, all I saved was the drive shaft and shims gear end is smaller than a mercury drive shaft

**tlwjkw** · 12-06-2023, 03:29 AM

Originally Posted by Asstracker

Pretty sure they're pinned after the damage. I dont recal ever hearing of anyone doing it for preventative reasons but i could be wrong

your right... think its kinda a "normal" thing with OMC stuff but not tha merc cases...

**skialot2** · 12-06-2023, 03:52 AM

Could it possibly be an XR4 case? What is the diameter of the bullet? 4 1/4" or 4 3/4"?

Is there a retainer nut for the driveshaft under the water pump base? If not, it is an old preload pin case.

Pull out the forward gear and look for a part number on the gear. Search the part number to try and identify the gearcase.

**ivlakeman** · 12-06-2023, 05:55 AM

That is the parts number on the housing, same place as mercury, let me know if you find anything 1647-5675

**ivlakeman** · 12-06-2023, 06:19 AM

Click image for larger version.

Name: IMG_1985.jpg
Views: 15
Size: 108.5 KB
ID: 527532

Click image for larger version.

Name: IMG_1986.jpg
Views: 10
Size: 55.9 KB
ID: 527533

**skialot2** · 12-06-2023, 04:12 PM

The skinnier shaft is from an early preload pin lower unit. Looks just like mine without the bearing

Click image for larger version.

Name: IMG_20231206_160620899.jpg
Views: 6
Size: 253.5 KB
ID: 527555

The other end should look like this.

Click image for larger version.

Name: IMG_20231206_160628523.jpg
Views: 3
Size: 121.5 KB
ID: 527556

Mine is from a 1980/81 225

**25two.stroke** · 12-07-2023, 02:30 PM

It is an XR4/XR6 case. Small bullet. Don't scrap it unless the bore where the carrier rides is warped. Yes some pin the drag race cases as preventative especially when they are just made to do 1/4 mile pulls. Did the case have a reverse gear in it when you pulled it apart?

**tlwjkw** · 12-07-2023, 06:37 PM

this is an early XR6.. (bobby v. built for me a long time ago)... notice how tha cavitation plate extends past tha tail end.. tha XR4 case it stopped even with tha tail end.. justa easy way ta tell tha difference (XR4 or XR6) if it is actually a small dia. case............

**25two.stroke** · 12-07-2023, 06:56 PM

And the casing 1647-5675 is not the later casing. If its xr4 then its gonna be the version where the cav plate does not extend. If the cav plate extends then It has to be an I-6 case. Either way I wouldn't scrap it...the bore looks ok, so someone would want it.