Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 13-05-2020, 19:03   #1
rrn
Registered User
 
rrn's Avatar

Join Date: Mar 2014
Location: craig alaska
Boat: newport II 30
Posts: 42
are the four bolt patterns on propeller shaft to drive gear couplers one sizefitall

if i wanna change engines would the shaft bolts be compatible as the engines are near same hp like yanmar to volvo penta ?
the shaft drive engines look the same but are they really ?
even the engine mounts look close i am sure they may not be exact though still shoudnt be to hard to configure
__________________

__________________
rrn
rrn is offline   Reply With Quote
Old 13-05-2020, 19:11   #2
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 3,992
Re: are the four bolt patterns on propeller shaft to drive gear couplers one sizefita

The holes and the recess on the flange can be different. The Yanmar seems to have it's own unique dimensions. Engine mounts are rarely the same unless you order a BetaMarine with custom mounts.


Most, if not all, marine engine makers have the dimension drawing freely available for download so you can compare not only the dimensions, but the location of things like filters, dipstick, starter etc to assist in deciding if the engine will fit your application.
__________________

Reefmagnet is offline   Reply With Quote
Old 13-05-2020, 20:41   #3
Registered User

Join Date: Jun 2010
Location: Easton, MD
Boat: 15' Catboat, Bristol 35.5
Posts: 2,636
Re: are the four bolt patterns on propeller shaft to drive gear couplers one sizefita

Yes, they usually are the same. It's a function of the reduction gear not the engine. A 4", 4 bolt flange is the same for a lot of gears but it's best to check on their website for drawings.
kmacdonald is offline   Reply With Quote
Old 14-05-2020, 05:12   #4
Registered User

Join Date: Feb 2010
Posts: 612
Re: are the four bolt patterns on propeller shaft to drive gear couplers one sizefita

Quote:
Originally Posted by rrn View Post
if i wanna change engines would the shaft bolts be compatible as the engines are near same hp like yanmar to volvo penta ?

the shaft drive engines look the same but are they really ?

even the engine mounts look close i am sure they may not be exact though still shoudnt be to hard to configure


No!
No!
And No!
The only time you could ever get that lucky is if you were changing in the same engine and gearbox as original.
It gets worse if you go from say a Hurth on a Perkins to a Hurth on a volvo....... for reasons best known to themselves, Volvo changed the register from male to female on the Hurths they supplied on the back of their marine engines.
A lot of the gearbox manufacturers came up with their own bolt pattern and as far as I know there is no uniform standard. Here’s a partial list of small marine gear output flange sizes. Click image for larger version

Name:	IMG_2404.jpg
Views:	63
Size:	266.6 KB
ID:	215035
skipperpete is offline   Reply With Quote
Old 14-05-2020, 06:31   #5
Registered User

Join Date: Nov 2014
Posts: 1,165
Re: are the four bolt patterns on propeller shaft to drive gear couplers one sizefita

Quote:
Originally Posted by skipperpete View Post
No!
No!
And No!
The only time you could ever get that lucky is if you were changing in the same engine and gearbox as original.
It gets worse if you go from say a Hurth on a Perkins to a Hurth on a volvo....... for reasons best known to themselves, Volvo changed the register from male to female on the Hurths they supplied on the back of their marine engines.
A lot of the gearbox manufacturers came up with their own bolt pattern and as far as I know there is no uniform standard. Here’s a partial list of small marine gear output flange sizes. Attachment 215035

Pete,
When Volvo Penta discontinued the production of their own gearboxes and made the decision to buy and private label ZF product, they asked ZF to change the configuration of the output flanges on the smaller models to match the flanges on the old Volvo gears (MS, MSB, MS2). This avoided the necessity of making changes to their line of driveline accessories such as solid and split couplings, flexible couplings, etc. It also made it just a bit easier for individuals with existing engines to repower and not have to mess with the shaft and coupling.

For the larger VP engines up to 300+ h.p. range that use private label ZF product like the ZF 45A, 630A and 800, this change wasn’t done, because the existing VP product (MS3,4,5 & HS1) conformed to “industry norms”, namely the commonly found 5” Borg Warner coupling.
DougR is offline   Reply With Quote
Old 14-05-2020, 17:24   #6
Registered User

Join Date: Feb 2010
Posts: 612
Re: are the four bolt patterns on propeller shaft to drive gear couplers one sizefita

Hi DougR, thanks for the info re VP registers. To be fair to Volvo,several other manufacturers also use reverse registers, Twindisc is notable.
__________________

skipperpete is offline   Reply With Quote
Reply

Tags
gear, propeller, rope, size

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Could one use boat propeller to drive el generator? suiramor General Sailing Forum 81 17-05-2020 05:37
[SOLD] Shore Power Adaptors, Bag, Couplers Pirate007 General Classifieds (no boats) 0 16-02-2020 15:48
Refrigeration Couplers , sometimes cause trouble . Typhoon Plumbing Systems and Fixtures 19 19-06-2017 09:37
Experience With SigmaDrive Couplers holtjp Construction, Maintenance & Refit 0 11-08-2016 16:19

Advertise Here


All times are GMT -7. The time now is 00:00.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.