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07-30-2015, 11:17 PM #1Junior Member
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Indentify parts for Nitro Gear case
I bought a rebuilt Johnson 70hp 1987 with Nitro gear case. Problems with shifter control setup and blew the clutchdog damaging forward and reverse gears.
How can I identify accuratley the gearcase parts? I was told to look for the gear case parts of 1975 - 1976 Stinger (not Stinger2). I looked at evinrude.com and there is 4 motor models, 2 gearcases possible for the 4 motors
GEARCASE FOR MODELS 70572B,70573B
GEARCASE FOR MODELS 70572E,70573E
Which one would be the Nitro gearcase?
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07-31-2015, 04:25 AM #2Screaming And Flying!
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the one for 15" on a 70 is a nitro
or look at sst60 then you cant go wrong http://www.seawaymarine.com/p/SST-Race-Parts-2040
these guys also manufacturer the parts as many are NLA from BRP
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07-31-2015, 05:46 AM #3
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08-11-2015, 09:01 PM #4Junior Member
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No answer from Seaway marine after a few days, I'm starting to look elsewhere.
I came across the following :
"75 HP was built as a 15 inch shaft from 1975 through 1988 with a smaller gear housing and a 15-28 (1.87) gear ratio lower unit."
Now looking at 75 hp I get the option on BRP site for 15in transom. The forward and reverse gears are just about all the same across the year range and match what is listed from your reference to http://www.seawaymarine.com/p/SST-Race-Parts-2040. Looks like the SST60 also use the same gear case.
The major difference is the clutchdog. looks like Johnson kept changing the clutchdog even with same propshaft.
Any suggestion on the best choice for clutchdog?
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08-11-2015, 09:46 PM #5Screaming And Flying!
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The dog was strengthened
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