Return to the home page...

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

Reply
 
Thread Tools Display Modes
  #1   IP: 66.117.106.129
Old 11-10-2018, 04:17 PM
LordGothington LordGothington is offline
Senior Member
 
Join Date: Feb 2018
Posts: 26
Thanks: 4
Thanked 0 Times in 0 Posts
How tight should the water pump be attached?

Ahoy!

I am replacing the ancient sherwood water pump with a MMI water pump. How tight should the bolts be that attach the pump to the engine? The old bolts were not very tight at all. But, I also strongly suspected the water pump was leaking oil. (Something in that area definitely is). Initially I assumed it was due to the internal oil seal failing and leaking out of the weep hole. But now I am also considering the possibility that it was just not bolted on tight enough. I do have a torque wrench -- but it is probably too big to fit in the work area.

Also, does it matter which way the gasket faces? One side has writing, the other side does not.

In case it is not obvious, I am new to engine repair
Reply With Quote
  #2   IP: 98.165.207.17
Old 11-10-2018, 05:05 PM
zellerj zellerj is offline
Afourian MVP
 
Join Date: May 2005
Posts: 304
Thanks: 5
Thanked 115 Times in 69 Posts
They should be tight. Use your calibrated elbow, tighten until tight, then go 1/8th turn more.
__________________
Jim Zeller
1982 Catalina 30
Kelleys Island, Ohio
Reply With Quote
  #3   IP: 72.194.219.196
Old 11-10-2018, 05:38 PM
JOHN COOKSON JOHN COOKSON is offline
Afourian MVP, Professor Emeritus
 
Join Date: Nov 2008
Posts: 3,500
Thanks: 54
Thanked 855 Times in 629 Posts
Tighten both bolts evenly in progressive stages. Do not tighten one bolt max then tighten the other bolt max. Tighten them alternately and in evenly steps to max torque.This could have been the original problem that caused one bolt to be looser than the other.
Be sure you have a correct gasket - one that can withstand oil.
What do the pump and accessory drive mating surfaces look like? Are they parallel?
Be sure the threads on the bolts and the accessory drive are not a.....screwed up. While you have the pump off be sure the bolts twist in far enough and easy to secure the pump. Maybe the loose bolt cross threaded bit?


TRUE GRIT
Reply With Quote
  #4   IP: 107.77.97.120
Old 11-12-2018, 11:53 AM
lat 64's Avatar
lat 64 lat 64 is offline
Afourian MVP
 
Join Date: Oct 2008
Location: Fairbanks, Alaska
Posts: 1,964
Thanks: 39
Thanked 240 Times in 157 Posts
I don't recall what the thread size is for those water pump bolts, but I would not exceed these specs.:

GRADE 5
Coarse Thread
5/16-18 - 13 ft lbs.
3/8-16 - 23 ft lbs.
7/16-14 - 37 ft lbs.
__________________
Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1

"Since when is napping doing nothing?"
Reply With Quote
  #5   IP: 24.152.132.140
Old 11-12-2018, 01:34 PM
ndutton's Avatar
ndutton ndutton is offline
Afourian MVP
 
Join Date: May 2009
Location: Torrance, CA
Posts: 9,619
Thanks: 198
Thanked 2,208 Times in 1,425 Posts
The water pump mounting bolts are 3/8"-16. Lat's spec is right in the neighborhood of what I was guessing (25 ft-lbs.).
__________________
Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Reply With Quote
  #6   IP: 99.30.185.198
Old 11-12-2018, 08:52 PM
thatch thatch is online now
Afourian MVP
 
Join Date: Dec 2009
Location: Santa clarita, Ca.
Posts: 1,079
Thanks: 235
Thanked 257 Times in 138 Posts
And one last bit of installation instructions, "do not use split lock washers on those bolts". If you do, oil will follow the thread gaps and leak out through the slot.
Reply With Quote
The Following User Says Thank You to thatch For This Useful Post:
Administrator (11-13-2018)
  #7   IP: 72.69.36.126
Old 11-13-2018, 06:28 AM
tenders tenders is offline
Afourian MVP
 
Join Date: May 2007
Location: Harlem YC, City Island, NY
Posts: 1,439
Thanks: 46
Thanked 259 Times in 170 Posts
Quote:
Originally Posted by thatch View Post
And one last bit of installation instructions, "do not use split lock washers on those bolts". If you do, oil will follow the thread gaps and leak out through the slot.
Great Scott, it is entirely possible I’ve been doing this across multiple pumps over decades, and suffered the resulting consequences. I’m going to check that this weekend.
Reply With Quote
  #8   IP: 32.211.28.40
Old 11-13-2018, 12:49 PM
Al Schober's Avatar
Al Schober Al Schober is offline
Afourian MVP
 
Join Date: Jul 2009
Location: Uncasville, CT
Posts: 2,002
Thanks: 16
Thanked 578 Times in 405 Posts
This problem of the fluid following the root/crest of the threads is also an issue for the water jacket cover plate and the fasteners for the aft end of the reversing gear. With the water jacket, the use of studs vs bolts is a known solution. What do folks think about using studs for the water pump? Might actually make it easier to undo the lower fastener as the threads on the nut can be clean and back off easily. Using a bolt, we're always fighting the sealant.
Reply With Quote
  #9   IP: 24.152.132.140
Old 11-13-2018, 01:12 PM
ndutton's Avatar
ndutton ndutton is offline
Afourian MVP
 
Join Date: May 2009
Location: Torrance, CA
Posts: 9,619
Thanks: 198
Thanked 2,208 Times in 1,425 Posts
Quote:
Originally Posted by Al Schober View Post
What do folks think about using studs for the water pump?
That's how mine is (spare engine pictured for clarity)
Attached Images
 
__________________
Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Reply With Quote
  #10   IP: 99.30.185.198
Old 11-13-2018, 03:33 PM
thatch thatch is online now
Afourian MVP
 
Join Date: Dec 2009
Location: Santa clarita, Ca.
Posts: 1,079
Thanks: 235
Thanked 257 Times in 138 Posts
It would appear that a combination of a stud in the top hole and an "extendo-bolt" in the bottom hole might be the easiest installation approach.
Reply With Quote
  #11   IP: 107.77.97.120
Old 11-14-2018, 12:28 PM
lat 64's Avatar
lat 64 lat 64 is offline
Afourian MVP
 
Join Date: Oct 2008
Location: Fairbanks, Alaska
Posts: 1,964
Thanks: 39
Thanked 240 Times in 157 Posts
Quote:
Originally Posted by Al Schober View Post
This problem of the fluid following the root/crest of the threads is also an issue for the water jacket cover plate and the fasteners for the aft end of the reversing gear. With the water jacket, the use of studs vs bolts is a known solution. What do folks think about using studs for the water pump? Might actually make it easier to undo the lower fastener as the threads on the nut can be clean and back off easily. Using a bolt, we're always fighting the sealant.
We used to use Ford brand weatherstrip adhesive for head bolts(and others) that were set in threads that went into the water jacket.
It was a gooey rubber-cement-like product that set up in the threads and sealed them. The bolts would still be removable without much trouble.
However, we did have to clean the old glue from the bolt threads before putting them back.
I don't see it for sale anymore but I bet the black stuff from 3M would work the same.
__________________
Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1

"Since when is napping doing nothing?"
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
Water Pump issue Concord Troubleshooting 3 04-28-2014 04:34 PM
Water Pump Mystery - Running out of ideas Clucas Troubleshooting 15 05-16-2013 09:16 PM
Leaking MMI Water Pump Bruce A Cooling System 5 08-24-2011 12:25 PM
leaking water pump rogers jolly General Interest 9 04-25-2011 08:49 PM
FWC Raw vs. fresh water pump Qben Cooling System 115 04-23-2010 12:11 PM


All times are GMT -4. The time now is 05:58 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2024 Moyer Marine Inc.

All Rights Reserved