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Author Topic:   Johnson/Evinrude gearcases

onlyawhaler posted 09-10-2002 09:01 AM ET (US)
I have a 1987 Johnson 150 on a Outrage. There is a local dealer going out of business and he has several OMC lower end cases, some with all the gears and the others are the cast lower unit itself without anything inside. I know sooner or later, I'll probably hit and ding something and my question is there a difference between the 150hp gearcase housing vs a 175, 200, 225 in the 1980s? I would really like to pick up one as a spare, as the prices are great and there is no tech help at the shop at this point and any advice would be appreciated.
Thanks Much
Bigshot posted 09-10-2002 09:35 AM ET (US)
Thay are all the same. Shaft lengths differ. Make sure they are not blown to begin with.
Steve Leone posted 09-10-2002 11:06 AM ET (US)
Bigshot is right. Although you should make sure all the gear positions work and have it pressure / vacumm tested. It shold hold 15lbs both ways. Make sure you measure the shift shaft length before installation. sometimes they get spun out of whack when they are laying around. the specs and proceedure is in the shop manual. steve
rsgwynn1 posted 09-10-2002 04:10 PM ET (US)
I've been told that there is some difference in the v-6 lower units, depending on the year of model and whether or not the unit came off a looper or a pre-looper motor.
rsgwynn1 posted 09-10-2002 04:11 PM ET (US)
However, he was talking about the exterior case, not the innards.
Bigshot posted 09-10-2002 04:25 PM ET (US)
Old 70's might be hydraulic but not sure. i think all V^ are identical until early 90's when they went to the splitline gearcase which will still work. the only benefit of the splitline was it did not corrode where the lower met the mid section. Splines might differ so count splines. Also check to see if ratios are different....I doubt that too but I will look at some of my old Brochures.
jimh posted 09-10-2002 07:29 PM ET (US)
The original poster has also posted this same question to another forum.
Posting the same question to multiple forums is very much discouraged, for a number of reasons. If for nothing else, duplicate postings of the same question serve only to clutter the forum content. They also divide the responses among the duplicate postings, further spreading clutter and reducing the information content.
Dunk posted 09-11-2002 12:42 AM ET (US)
There are some different V6 gearcases. Specificly the V6 gearcases they used on the Xlong 115 and 140 V4's. These engine were meant to be sold as twins for offshore boats. They had different gear ratios. The normal V6 gearcase was 1.86 to 1 and the V6 gearcases used on the V4's was 2.27 to 1. They did this so the V4 could twist the normal V6 props up to rpms and be able to get a counter rotating gearcase on a V4.
As long as you know the gearcase you are buying came off a V6 then it's not problem. If you wind up with one that has the lower gear ratio you'll be looking for a prop with about 4" more pitch. Make sure you are not buying a counter rotator..unless to want one..
Another thing is driveshafts. Becareful with your deal. I gearcase without a DS needs a 900.00(new) driveshaft. Before you buy you should lift the water pump and the upper bearing under it to inspect the DS surface. If it corroded and rough it will never seal. Some had one piece Ds's and some had 2 piece Ds's, but you can't tell that unless you release the driveshaft and pull it completely out.. Then again it all depends on the price and what you expect.
frank_king posted 09-19-2002 10:16 PM ET (US)
where are you located onlyawhaler? i am interested in a lower unit...
Hendrickson posted 09-20-2002 02:19 AM ET (US)
Dunk, I have a 25" shaft 1985 120. I was once told that the 120's and 140's that used the V6 lower unit only did so in 1985. In fact, most of these engines from my area came off US Park Service boats that were equiped with dual engines.

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Author	Topic: Johnson/Evinrude gearcases
onlyawhaler	posted 09-10-2002 09:01 AM ET (US) I have a 1987 Johnson 150 on a Outrage. There is a local dealer going out of business and he has several OMC lower end cases, some with all the gears and the others are the cast lower unit itself without anything inside. I know sooner or later, I'll probably hit and ding something and my question is there a difference between the 150hp gearcase housing vs a 175, 200, 225 in the 1980s? I would really like to pick up one as a spare, as the prices are great and there is no tech help at the shop at this point and any advice would be appreciated. Thanks Much
Bigshot	posted 09-10-2002 09:35 AM ET (US) Thay are all the same. Shaft lengths differ. Make sure they are not blown to begin with.
Steve Leone	posted 09-10-2002 11:06 AM ET (US) Bigshot is right. Although you should make sure all the gear positions work and have it pressure / vacumm tested. It shold hold 15lbs both ways. Make sure you measure the shift shaft length before installation. sometimes they get spun out of whack when they are laying around. the specs and proceedure is in the shop manual. steve
rsgwynn1	posted 09-10-2002 04:10 PM ET (US) I've been told that there is some difference in the v-6 lower units, depending on the year of model and whether or not the unit came off a looper or a pre-looper motor.
rsgwynn1	posted 09-10-2002 04:11 PM ET (US) However, he was talking about the exterior case, not the innards.
Bigshot	posted 09-10-2002 04:25 PM ET (US) Old 70's might be hydraulic but not sure. i think all V^ are identical until early 90's when they went to the splitline gearcase which will still work. the only benefit of the splitline was it did not corrode where the lower met the mid section. Splines might differ so count splines. Also check to see if ratios are different....I doubt that too but I will look at some of my old Brochures.
jimh	posted 09-10-2002 07:29 PM ET (US) The original poster has also posted this same question to another forum. Posting the same question to multiple forums is very much discouraged, for a number of reasons. If for nothing else, duplicate postings of the same question serve only to clutter the forum content. They also divide the responses among the duplicate postings, further spreading clutter and reducing the information content.
Dunk	posted 09-11-2002 12:42 AM ET (US) There are some different V6 gearcases. Specificly the V6 gearcases they used on the Xlong 115 and 140 V4's. These engine were meant to be sold as twins for offshore boats. They had different gear ratios. The normal V6 gearcase was 1.86 to 1 and the V6 gearcases used on the V4's was 2.27 to 1. They did this so the V4 could twist the normal V6 props up to rpms and be able to get a counter rotating gearcase on a V4. As long as you know the gearcase you are buying came off a V6 then it's not problem. If you wind up with one that has the lower gear ratio you'll be looking for a prop with about 4" more pitch. Make sure you are not buying a counter rotator..unless to want one.. Another thing is driveshafts. Becareful with your deal. I gearcase without a DS needs a 900.00(new) driveshaft. Before you buy you should lift the water pump and the upper bearing under it to inspect the DS surface. If it corroded and rough it will never seal. Some had one piece Ds's and some had 2 piece Ds's, but you can't tell that unless you release the driveshaft and pull it completely out.. Then again it all depends on the price and what you expect.
frank_king	posted 09-19-2002 10:16 PM ET (US) where are you located onlyawhaler? i am interested in a lower unit...
Hendrickson	posted 09-20-2002 02:19 AM ET (US) Dunk, I have a 25" shaft 1985 120. I was once told that the 120's and 140's that used the V6 lower unit only did so in 1985. In fact, most of these engines from my area came off US Park Service boats that were equiped with dual engines.