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Alpha 1 Gen ll outdrive

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matt21

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I have bought a 1993 Sylvan 209 with a 5.0 LX/V8 Alpha One motor. The boat has had the lower
unit knocked off, I am looking for help on what gear ratio is needed. I have the following info.
Engine# OD828478
Transom# OD773413
Drive# OD777385
Boat# SLY93558F293
Thank you for any help. Matt
 
When you're complete drive was sold new, the gear ratio was 1.50:1. (DRV: 0D777385 Model number 5010150FS MERCRUISER ALPHA 1.50:1)
 
Docksidemarineservices said:
Aren't Gen Two drives for a 5.0 1.62:1?
Click to expand...
Yes you are correct, the 5.0l engine had a 1.65:1, (Now a 1.62:1 ratio due to the lower unit having gear case gears count of 13-21, See 3'rd link down), But since he has a 5.0LX engine, Merc put in the 1.50:1 ratio as a standard ratio, Then for high altitude running with the LX model, Merc recommended putting in the 1.65:1 or 1.84:1 depending on boat size & elevation.

(5.0L • w/1.65 No Change No Change 1.84:1 1.84:1,) (5.0LX w/1.50 No Change 1.65:1 1.84:1 1.84:1)
Service bulletin # 93-7,
http://www.boatfix.com/merc/bullet/93/93_07.PDF
http://www.marinemechanic.com/merc/distributors/mercurymarine/sterndrive/highaltitude-sterndrive.PDF
http://bluewatermarinesvc.com/pdf/mercruiser_gear_ratios.pdf

ENG: 0D828478 450L100ES MERCRUISER W/ PS 5.0LX ALPHA I
DRV: 0D777385 5010150FS MERCRUISER ALPHA 1.50:1
TRN: 0D773413 6010000ES MERCRUISER ALPHA TRANSOM

 
Last edited:
The boat has had the lower unit knocked off...
Click to expand...
Do you mean it has been in a collision or just removed? SEI makes a decent aftermarket L/U. The whole OD could be replaced for the cost of a Merc. L/U. I believe it has a 3 yr "No questions asked" warranty. I don't work for SEI or own any stock...just providing info. If the OD was in a collision the upper unit and gimbal assy. will need a close inspection for damage.
 
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