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  #1  
Old 09-08-2014, 09:05 AM
Fr. Frank Fr. Frank is offline
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Default Seafari Pre-Alpha gear ratio

The decal with the gear ratio stamp on my 1971 Type I (aka pre-Alpha, aka Type R) outdrive is missing. Anyone know the gear ratio on the 1969-1973 Mercruiser 140 equipped Seafari's with the older outdrive?

I've been offered a free rebuilt 1974 early Alpha 1 drive (short splined-shaft) with a 1.65 gear ratio that one of my West Marine customers has had sitting in his garage for over 20 years, and I think the ratio on my current outdrive is either 1.81 or 1.95. It makes a difference in figuring out which prop to work with.

This guy had the drive rebuilt and it was in his truck when his barn caught fire and burned the boat with it. Insurance was had.
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Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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  #2  
Old 09-08-2014, 12:59 PM
bigeasy1 bigeasy1 is offline
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Default

Father, I think you can take off the top cover on the upper case,.and count the teeth on the gears to find the ratio.This chart may help.

http://www.seilermarine.com/info/mer...atio-chart.php
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  #3  
Old 09-08-2014, 01:26 PM
McGillicuddy McGillicuddy is offline
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Padre,
My book shows the Model I early 110/140 shows 2:1

Model 140R s/n above 2791957 shows 1.98:1

Make sure the transom assembly is compatible. I found the Alpha drive was not compatible type I-C EZ transom assembly.

I don't know if simply changing out the transom assembly would allow you to go with the early Alpha which may be far easier to find parts for.'.

These ratios come from the Seloc manual because I couldn't find the info in the Mercury Manuals.

Err, are there moral implications relative to the insurance history?

Let us know what you find...
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  #4  
Old 09-08-2014, 11:36 PM
Fr. Frank Fr. Frank is offline
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Default Thanks!

Thanks! Tooth count says I have 1.98:1
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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  #5  
Old 09-08-2014, 11:41 PM
Fr. Frank Fr. Frank is offline
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Join Date: Oct 2003
Location: Shalimar, Florida
Posts: 2,265
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Quote:
Originally Posted by McGillicuddy View Post
Padre,

Err, are there moral implications relative to the insurance history?

Let us know what you find...
I don't think so. He's not making a profit on it.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
Reply With Quote
  #6  
Old 09-21-2014, 11:00 AM
hiliner222 hiliner222 is offline
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Join Date: Jan 2012
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When i pulled mine out of my 20 Sefari it was a 198:1 drive. Looked to be original. That 165 ratio drive wont be right.
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  #7  
Old 09-21-2014, 10:31 PM
Fr. Frank Fr. Frank is offline
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Join Date: Oct 2003
Location: Shalimar, Florida
Posts: 2,265
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Yeah, I know. I'd have to radically change props to about a 16" pitch from the current 19".
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
Reply With Quote
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