Return to the home page...

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

Thread Tools Display Modes
  #1   IP:
Old 03-11-2007, 10:15 AM
Jim Mac Jim Mac is offline
Frequent Contributor
Join Date: Jan 2007
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Valve Adjustment


I found in one of your posts a valve adjusting procedure stating that proper clearence for the valve / tappet as .010 for the intake & .012 for the exhaust. In the technical data section of a service manual by Universal I find stated clearences "cold" to be .008 & .010. After all this work I would like to get this right. Can you shed some light?

Thanks for your help again.

Reply With Quote
  #2   IP:
Old 03-12-2007, 04:42 PM
Don Moyer's Avatar
Don Moyer Don Moyer is offline
Join Date: Oct 2004
Posts: 2,811
Thanks: 0
Thanked 180 Times in 122 Posts

We have never come across any Universal Manual that called for anything other than .010" for the intake valve clearance, and .012" for the exhaust valves with the engine cold. The .008" and .010" values would be correct for a hot engine. These are definitely the correct values today, even if there was an archival manual somewhere with different specs.

Reply With Quote
  #3   IP:
Old 02-01-2015, 03:30 PM
sglazebrook sglazebrook is offline
Senior Member
Join Date: Mar 2013
Posts: 75
Thanks: 2
Thanked 0 Times in 0 Posts
Archival Manual - Valve Tappet Setting

Hi all.

Last weekend I did a little work on my A4 - new belt tensioner from MMI, re-epoxied the water jacket breaches (last time before considering a new short block), and adjusting the tappet clearances. According to two of the three manuals that came with the boat (unsure if any are related specifically the "rebuilt" 1967 block engine without visible serial number), the tappet clearance settings are different than standard practice here. Unfortunately, I set the tappets per 2/3 of the manuals without checking the forum first. Of course, today I couldn't get the A4 to start. Lucky to have good access to the valve side and only had to remove the carb to get at the cover and tappets. All set to E = 0.012 and I = 0.010 COLD. Starts and purrs again. But why the different values in the other manuals? Here is the proof.

Both list the clearances as E = 0.010 and I = 0.008 COLD. "Archival Manual" I guess...

Last edited by sglazebrook; 02-01-2015 at 05:10 PM.
Reply With Quote
  #4   IP:
Old 02-02-2015, 11:03 AM
marthur's Avatar
marthur marthur is offline
Afourian MVP
Join Date: Dec 2004
Location: Grand Rapids, Michigan
Posts: 831
Thanks: 25
Thanked 33 Times in 28 Posts

The green covered Medalist Motors guide looks similar to my A-4 Operating manual.

I had never seen the Westerbeke manual. BUT looking at the cover, I managed to find it online and download it. For anyone else interested, try this link:

Westerbeke A-4 manual on ManualsLib

Because this is a very old thread, I will post this as a new thread as well.

Reply With Quote
  #5   IP:
Old 02-04-2015, 10:12 AM
sglazebrook sglazebrook is offline
Senior Member
Join Date: Mar 2013
Posts: 75
Thanks: 2
Thanked 0 Times in 0 Posts
Most important thing is to ...

Trust our host here (and the membership) who always has the latest and greatest information. There is a lot of misinformation out there on other forums, at the docks, and even in the manuals. I am so appreciative for this site, and sometimes don't minding doing it twice because I learn so much. Thank you!
Reply With Quote
  #6   IP:
Old 02-04-2015, 10:51 AM
sastanley's Avatar
sastanley sastanley is offline
Afourian MVP
Join Date: Sep 2008
Location: Solomons, MD
Posts: 6,956
Thanks: 1,042
Thanked 555 Times in 414 Posts
Several years ago, rigspelt had a great illustration related to valve adjustments with input and confirmation from Don M.

here is a link to that thread.
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold - for sale - PM me if interested
"Holiday" - '89 Alura 35 #109 (uh oh, two boat owner!!)
Reply With Quote

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
Broken Valve Spring redwitch Troubleshooting 9 09-18-2020 11:03 PM
Carburetor float adjustment COB Fuel System 9 08-08-2012 11:16 AM
fuel pump adjustment? altair Fuel System 2 10-26-2010 07:55 PM
Broken valve stem stuck in the valve guide Unregistered General Maintenance 1 11-19-2005 08:26 AM
Valve adjustment Banyan Day General Maintenance 1 02-14-2005 07:53 PM

All times are GMT -4. The time now is 07:05 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2023 Moyer Marine Inc.

All Rights Reserved