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  

Worn Camshaft Lobes

Old Marine Engine » One and Two Cylinder Gas Inboards » Worn Camshaft Lobes « Previous Next »

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

marks
Posted on Tuesday, July 22, 2003 - 09:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I was wondering if anybody has come across this problem in the past and has any advice on how to fix.

I have a 3HP ACME I'm currently restoring. It is a single cylinder side valve engine.

The camshaft is cast iron. The cam followers have a large captive ball bearing which rides on the cam shaft lobes.

The ball bearings do not turn when under any reasonable pressure, which has caused quite deep grooves to be worn into both lobes.

It seems that there three possible alternatives to fix this:

1) Have the camshaft lobes built up by spray welding or similar and reground. I can't regrind only as there is not enough iron and the lobes are cast iron.

2) Make up two new lobes. They are pinned onto the shaft.

3) Some sort of epoxy, JB Weld?

Are there any other options that anybody can see?

Obviously when the cam is sorted out I will need to do something about the followers.

I really need to do this correctly as the engine will be going into a boat.

Thanks in advance,

Mark S.
Top of pagePrevious messageNext messageBottom of page Link to this message

steve fox
Posted on Tuesday, July 22, 2003 - 10:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Mark

I think you would do best to have new ones made. JB weld will wear away quickly with the engine heat and friction. If the lobes are only pinned on, a local machine shop can make you new ones and you can attach them yourself. I made a ignition timing camshaft for a Martin 40 outboard on a lathe and then shaped it with a handfile. However, for what you are doing, see a machinist.

Rgds Steve
Top of pagePrevious messageNext messageBottom of page Link to this message

richarddurgee
Posted on Tuesday, July 22, 2003 - 10:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

This ad is in GEMagazine ?


cam
Top of pagePrevious messageNext messageBottom of page Link to this message

marks
Posted on Friday, July 25, 2003 - 03:41 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thankyou,

If I can get the lobes off then I will get new ones made. I've driven the pins out but it seems they were also pressed on and not really designed to be taken apart again.

If I can't get them off I will try to get them spray welded and reground.

Mark S.

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