Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Overhaul

Reply
 
Thread Tools Display Modes
  #1   IP: 73.16.143.62
Old 07-19-2021, 06:30 PM
Sculldog1 Sculldog1 is offline
Senior Member
 
Join Date: Nov 2018
Location: Fairhaven MA
Posts: 25
Thanks: 26
Thanked 11 Times in 5 Posts
A valve grinding tool for #4 exhaust?

7 of 8 valves and seats lapped and ready to go back in! However, the #4 exhaust valve was badly pitted and I ordered new one. Question is is there a tool or grinding stone I might be able to use to create an acceptable surface on the seat as it is pretty rough? I will be lapping the new valve into the seat but thought that if I could use another tool to do some of the initial work it might go faster and give a better result.
Reply With Quote
  #2   IP: 165.225.20.156
Old 07-19-2021, 06:54 PM
Surcouf's Avatar
Surcouf Surcouf is online now
Afourian MVP
 
Join Date: May 2018
Posts: 312
Thanks: 251
Thanked 126 Times in 97 Posts
I would say the old valve: might be pitted and not re-usable, but should be a good "lapping tool"
__________________
Surcouf
A nostalgic PO - Previously "Almost There" - Catalina 27 (1979)
Reply With Quote
The Following User Says Thank You to Surcouf For This Useful Post:
Sculldog1 (07-19-2021)
  #3   IP: 73.16.143.62
Old 07-19-2021, 07:28 PM
Sculldog1 Sculldog1 is offline
Senior Member
 
Join Date: Nov 2018
Location: Fairhaven MA
Posts: 25
Thanks: 26
Thanked 11 Times in 5 Posts
I did try that but the top was quite badly pitted and the suction cup thing wouldn't stick to it making it ineffective. I was beat from lapping the first 7 valves and called it quits at that point. I may try to tack weld a bolt to the valve so I can chuck it into cordless drill and have at it that way. I did see 45* grinding stone but not sure if this would damage seat to the point of ruining it and forcing me to pull the motor. Would need .3145 mandrel I suppose but not sure if it is prudent considering I am trying to avoid engine take out and haul out. Any thoughts from machinist types appreciated. Thanks
Attached Images
 
Reply With Quote
  #4   IP: 155.186.122.195
Old 07-21-2021, 12:02 AM
Dave Neptune Dave Neptune is online now
Afourian MVP, Professor Emeritus
 
Join Date: Jan 2007
Location: Lake Arrowhead Ca.
Posts: 4,465
Thanks: 542
Thanked 719 Times in 489 Posts
Valve seat "cutters" are available easy to use and usually available for rent. I have used them of many engines.

Dave Neptune
Reply With Quote
The Following 3 Users Say Thank You to Dave Neptune For This Useful Post:
Peter (07-21-2021), Sculldog1 (07-21-2021), TimBSmith (07-21-2021)
  #5   IP: 32.211.28.40
Old 07-25-2021, 06:47 PM
Al Schober's Avatar
Al Schober Al Schober is offline
Afourian MVP
 
Join Date: Jul 2009
Location: Uncasville, CT
Posts: 1,815
Thanks: 11
Thanked 409 Times in 302 Posts
Using a valve as a lapping tool is OK, but it's not going to remove much metal. You really need something more aggressive, such as the stone in the photo.

Last engine I did, I had the shop do the valves and seats. Intake seats weren't too bad and ground in. The exhaust seats were shot and the shop installed carbide inserts - no extra charge.

I like Goodson for engine tools! www.goodson.com
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Effects of Broken #1 Exhaust Valve Wrsteinesq Troubleshooting 2 08-08-2017 07:58 PM
bent #3 exhaust valve adab1402 Overhaul 3 01-12-2009 06:46 PM
Stuck #4 Exhaust Valve: A special Tartan 30 problem? jellisfeingold Tartan 7 12-09-2006 03:11 PM
Check valve in exhaust system BBH Exhaust System 3 11-16-2006 06:03 AM


All times are GMT -4. The time now is 08:45 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2021 Moyer Marine Inc.

All Rights Reserved