Wanted Merc Speedmaster V drives
02-13-2012 | 11:29 AM
#11
Registered
Joined: Nov 2005
Posts: 2,399
Likes: 15
From: Toronto, Canada
AEX... I have transoms and IIIA's 1:33 ratio, perfect for your cat, cam off of mine, they were fresh with new gear sets... let me know if you wanna talk about them... I'll cut ya a great deal on them
02-13-2012 | 07:37 PM
#12
Thread Starter
Registered
Joined: Mar 2005
Posts: 529
Likes: 12
From: RI Narragansett Bay
I'm sending my fives to Offshore in Ft Laud for refresh and since they are getting scarce I figure some extra drives may be worth the investment , but I'm not going to buy for junk .
I cracked IV gear cases over the prop shafts several times , this never happened with the V's .
I'm dialed for the V drives on boxes anyway so going to III's would throw everything off .
Thanks for the offer .
I cracked IV gear cases over the prop shafts several times , this never happened with the V's .
I'm dialed for the V drives on boxes anyway so going to III's would throw everything off .
Thanks for the offer .
02-13-2012 | 07:55 PM
#13
Thread Starter
Registered
Joined: Mar 2005
Posts: 529
Likes: 12
From: RI Narragansett Bay
I enlarged the pictures and it is extremely difficult to tell, as they are so dark, if the upper housing is one of the latest design, #5 housings. The last design #5 upper housing was "smooth" on the side where the 6 stud holes are. The early #5 and all the #4 upper housings were "scalloped " around these stud boss's. A #5 lower case might have a V stamped in it immediately in front of the wear plate area. The true way to tell is separate the upper and lower housings and look at the front verticle shaft. A #4 and early #5's were polygon in shape. A true #5 will have a splined front verticle shaft. Also the spur gears on a #5 are 1" in thickness. Also look at the OD of the trim pin hole in the rear of the upper case. On a #5 it is 1" in comparison to a 7/8" pin for a #3 or #4 drive.
Hope this helps.
Gary Kollofski
612-247-7081
Hope this helps.
Gary Kollofski
612-247-7081
02-14-2012 | 02:17 PM
#14
Platinum Member
Joined: Oct 2000
Posts: 1,056
Likes: 29
From: Santa Barbara CA. USA
I checked today and was told that if there is a fill port in the rear cap, it is probably a real early #4 drive from the early 80's. A true #5 will not have a fill port on/in the rear cap.
Gary
Gary
02-14-2012 | 07:46 PM
#16
Thread Starter
Registered
Joined: Mar 2005
Posts: 529
Likes: 12
From: RI Narragansett Bay
At that time 750 hp totally surfaced on the cat with extn boxes . The lower gear cases developed a crack in the housings vertical trailing edge about 1.5 inch below the cavitation plate after 4-5 races . I switched to fives when they were introduced and then never had another problem with 950 hp in a light 30 footer .
02-14-2012 | 08:48 PM
#17
Registered
Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
[QUOTE=aex;3617797]At that time 750 hp totally surfaced on the cat with extn boxes . The lower gear cases developed a crack in the housings vertical trailing edge about 1.5 inch below the cavitation plate after 4-5 races . I switched to fives when they were introduced and then never had another problem with 950 hp in a light 30 footer .[/QUOTE
So a V has a stronger case than a IV??
So a V has a stronger case than a IV??
07-17-2016 | 05:27 AM
#19
Registered
Joined: May 2006
Posts: 281
Likes: 0
From: Covington, LA
I know this is a bit old but I'm curious if IV and V uppers and lowers are interchangeable?
