Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-01-2012, 19:07   #1
Registered User

Join Date: Jan 2012
Location: NZ
Boat: Westsail 32
Posts: 6
Perkins 4/108 tachometer

I have a Perkins 4/108 with mechanical tacho- and hourmeter. I am currently replacing all gauges and have to find out the speed ratio of the Tachometer (.5:1, 1:1, 2:1 ...) so I can order a new one. Can anybody help?
Ta, Holger
__________________

__________________
Holger is offline   Reply With Quote
Old 02-01-2012, 19:21   #2
Registered User
 
familycruisers's Avatar

Join Date: Aug 2011
Location: On the boat
Boat: Westerly Centaur. 26'
Posts: 500
Send a message via Skype™ to familycruisers
Re: Perkins 4/108 tachometer

can you pull it apart , turn it over, count the turns it makes?
__________________

__________________
familycruisers is offline   Reply With Quote
Old 02-01-2012, 19:31   #3
Registered User

Join Date: Jan 2012
Location: NZ
Boat: Westsail 32
Posts: 6
Re: Perkins 4/108 tachometer

Not quite sure what to take apart and count.
Holger
__________________
Holger is offline   Reply With Quote
Old 02-01-2012, 19:46   #4
Registered User
 
familycruisers's Avatar

Join Date: Aug 2011
Location: On the boat
Boat: Westerly Centaur. 26'
Posts: 500
Send a message via Skype™ to familycruisers
Re: Perkins 4/108 tachometer

By mechanical I assume you mean driven by a cable. Doesn't that screw onto the back of the tach? Pull that out, turn over motor. Watch the flywheel. If it goes around once, how many times did the shaft move. That should give you your ratio. (i don't have a Perkins just trying to help)
__________________
familycruisers is offline   Reply With Quote
Old 02-01-2012, 21:42   #5
Registered User

Join Date: Jan 2012
Location: NZ
Boat: Westsail 32
Posts: 6
Re: Perkins 4/108 tachometer

I see what you mean, it should do the trick in theory. I am not sure if I can turn the engine in a controllable fashion though since no decompression is installed. Good idea nevertheless, thank you.
Holger
__________________
Holger is offline   Reply With Quote
Old 03-01-2012, 06:40   #6
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,573
Images: 240
Re: Perkins 4/108 tachometer

Greetings and welcome aboard the CF, Holger.

The Shop Manual may have some useful information.
http://www.endeavourowners.com/dscsn...p%20Manual.pdf
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 03-01-2012, 07:11   #7
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,114
Re: Perkins 4/108 tachometer

Don't you also need to know the drive ratio of the engine driven takeoff point?
__________________

__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Reply

Tags
perkins

Thread Tools
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
Fram Oil Filter for Perkins RHoodJr Construction, Maintenance & Refit 18 30-10-2011 19:11
Perkins Nightmare cburger Construction, Maintenance & Refit 31 06-09-2011 09:30
Tachometer on Perkins m92 cat-sailor Engines and Propulsion Systems 1 17-07-2011 12:23



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 00:24.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.