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  

Timer repair - more

Old Marine Engine » Timers, Magnetos, Ignition » Timer repair - more « Previous Next »

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

miro forest
Senior Member
Username: miro

Post Number: 1144
Registered: 11-2001

Posted on Tuesday, August 10, 2021 - 08:19 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

After several months of running , my engine started to mis-fire on one cylinder , but was OK on the second, even with the "fix" that I had used - see my earlier post on this thread.
There was nothing for it but to pull the engine out of the boat, and rebuild the timer contacts.

I've attached a sketch of the timer contact housing. The bore is nominally 5/16 in or 0.312 in.
The bore had been banged out and bell mouthed to about 0.360 in, so the spring loaded brass slug was hanging up - what to do?


I bored the oval hole out to make it round and inserted a brass plug the whole length of the bore and sweat soldered it in. Then I bored it out 5/16 and machined a new slug for the contact. Did this for both timer contacts.

Once re-installed on the engine, I got a nice hot, blue, noisy spark on both cylinders.

The most interesting effect, though was that I was able lean out the mixture by a 1/4 turn of the mixture screw on the Schebler.

This provides further evidence that most carb problems are electrical in nature :=}


Add Your Message Here
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.
Options: Automatically activate URLs in message

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