Pearson Yachts Forum

Pearson Boats - Common Systems => Engine and Drive Train => Topic started by: mitchellthomas on June 15, 2020, 06:32:39 PM

Title: V-Drive question
Post by: mitchellthomas on June 15, 2020, 06:32:39 PM

Does anyone know what the transmission reduction ratio is on a P323 with an MD-11C and V-Drive? I can't find it in the documentation. Thanks.

Title: Re: V-Drive question
Post by: Dolce_Vita on June 16, 2020, 09:16:52 AM

It should be stamped on the v-drive serial number plate.

Title: Re: V-Drive question
Post by: admin on July 03, 2020, 02:35:51 PM

Of course I would check the serial number plate as recommended.  But here is what I have found from Pearson Yachts specs:

23HP 2-cylinder Volvo MD 11C Diesel Engine and 1.91:1 reduction gear in V-drive
-- OR --
30HP 4-cylinder Unversal Atomic 4 Gasoline Engine and 2:1 reduction gear in V-drive

P323 Specifications (https://pearson323.com/pearson-323-sailboat.html)

Title: Re: V-Drive question
Post by: Dolce_Vita on July 04, 2020, 02:26:55 PM

I can confirm that the P323's Atomic-4 V-drive reduction is 2:1.  Doesn't help you with the diesel though.

Title: Re: V-Drive question
Post by: Frayed Knot on December 08, 2020, 10:11:24 PM

Mine has a 23HP 2-cylinder Volvo MD 11C Diesel Engine and 1.91:1 reduction gear in V-drive.

Title: Re: V-Drive question
Post by: Mikbee on December 13, 2020, 07:20:00 AM

Quote from: Frayed Knot on December 08, 2020, 10:11:24 PM

Mine has a 23HP 2-cylinder Volvo MD 11C Diesel Engine and 1.91:1 reduction gear in V-drive.

Do you know what the model number is on your volvo gear box? I removed and replaced when replacing the oil pan and the model number is worn. Drained the fluids on Walter V drive and gear box. Not sure what type of oil to put in...

Title: Re: V-Drive question
Post by: Dolce_Vita on December 13, 2020, 10:58:10 AM

Per the Walter V-drive documentation:

"Recommended Oils:
  SAE 30 Heavy Duty Motor Oil
  Exxon Spartan EP-68 Gear Oil
  APG-80 Gear Oil

DO NOT USE SAE 80 MOTOR OIL OR MULTI-GRADE OILS SUCH AS 10W30 OR 10W40"

Title: Re: V-Drive question
Post by: selene on December 14, 2020, 03:49:49 PM

FWIW, my 28hp Westerbeke has a Hurth ZF15 v-drive transmission with 2.13:1 reduction...

Title: Re: V-Drive question
Post by: Alma on December 14, 2020, 06:01:52 PM

My Atomic Four manual says 80,90 gear oil. Walter Gear now says SAE 30 HD motor oil...

I have been using 90wt Gear Oil but I'd like to use SAE30 HD motor oil since it would make the Vee Drive less drag.

In winter I can hardly turn the prop shaft by hand the 90 weight oil is so thick.

But- My Vee Drive is original and it weeps a little 90 weight at the seal. I bet the SAE 30 would drip.

An overhaul by Walter is about a Grand- Thats a lot just for a seal. To get to the seal a special spanner is required. My friend has one for his Ducati Motorcycles- but we tried and it was too tight. I didn't want to make a mess in Spring with a new engine so I just went with the 90 oil again.

It is down my to-do list since it works fine and isn't deteriorating- But if you can use the SAE 30 HD it will boost fuel economy.