Home | Classifieds | History | Technical | Links | Store | About Us | Email
Topics Topics Edit Profile Profile Help/Instructions Help Member List Register  
Search Last 1|3|7 Days Search Search Tree View Tree View  

Sea Pub Magneto timing question

Old Marine Engine » Timers, Magnetos, Ignition » Sea Pub Magneto timing question « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Jurgen Hermes
New member
Username: hermesj

Post Number: 3
Registered: 06-2007
Posted on Tuesday, June 05, 2007 - 05:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

In 1976, I installed the Kermath into my Tumlaren 28' sailboat.
I sold the boat in 1984 but the new owners called me early this spring to clear up some issue with the registration of the vessel and we became sort of friend with them living and sailing nearby.
Yesterday, I tried to bring to life, the old Kermath and low and behold, after 3 hours I got her runnning very nicely.
However, at speed, it sounds like the timing is not right, e.g. it doesn't quite come up to the RPM's it should.
Question:
On the Magneto there are some marks (4 or 5) representing some degree of advance or retard, how many degrees does each marks represent and where should it be adjusted to?
I got it on the 1st mark in the advanced position.

Thanks Jurgen
Top of pagePrevious messageNext messageBottom of page Link to this message

Lawrence T Wolfe
Senior Member
Username: larry_from_maryland

Post Number: 245
Registered: 07-2003


Posted on Tuesday, June 05, 2007 - 07:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The magneto turns at 1/2 the speed of the crankshaft so normally the distance between marks are 1 degree. It takes a big move at the mag to get the same change on the crank. You could just turn the mag while its running and find the best spot.
Top of pagePrevious messageNext messageBottom of page Link to this message

Lawrence T Wolfe
Senior Member
Username: larry_from_maryland

Post Number: 246
Registered: 07-2003


Posted on Tuesday, June 05, 2007 - 08:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Oops a small move at the mag makes a big change on the crank. Which mag do you have.
Top of pagePrevious messageNext messageBottom of page Link to this message

Jurgen Hermes
Member
Username: hermesj

Post Number: 4
Registered: 06-2007
Posted on Wednesday, June 06, 2007 - 11:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Lawrence,
thanks for your reply.I am not sure of the make of the Mag but I know it's
origional. The Kermath was sold new to me 35 years ago as an Atomic 1. I
will ask the present owner of the boat to have a look at it and see if he
can make our the MFG of the Mag.
Adjusting it while it's running seems a good way of getting it right enough.
Next time I visit the owner I will experiment with it; it is a bit of a bear
to get at the bottom nut that holds the mag. Prently the mag is in the
advanced position on the first mark before TDC and the motor starts and
idles fine, only at higher RPM it sounds to me that it is not coming up to
full power.

Thanks again
Jurgen

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Password:
E-mail:
Options: Automatically activate URLs in message
Action:

Administration Administration Log Out Log Out   Previous Page Previous Page Next Page Next Page

Home | Classifieds | History | Technical | Links | Store | About Us | Email
&copy 2005 OldMarineEngine.com, P.O. Box 188, Forest Dale, VT 05745-0188 • Phone: 802-247-4864 • All rights reserved.
   Marine Engine Seloc Repair Manual Lookup Tool

marine gas engine repair and restoration