block thread for coolant plug stripped... - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Engines > Diesel
 Not a Member? 

Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


Reply
 
LinkBack Thread Tools
  #1  
Old 12-11-2011
Senior Member
 
Join Date: Sep 2006
Posts: 2,179
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Rockter will become famous soon enough
block thread for coolant plug stripped...

The thread at the bottom of the aft barrel in my MD 17C Volvo is stripped, and so the coolant plug (brand new) will not tighten into it even with the help of teflon tape.

The coolant plug is the part number 829592 on this link...

Volvo Penta MD17C Diesel Engine Parts and Spares

I think the thread is 1/8 BSPT, but I cannot be sure.

It still holds coolant pump pressure, but I am afraid that it may blow out and cause an overheat. It reallty did turn far too easily today when I was draining the coolant.

I may have to drill and re-tap for a different design plug (and I have access for that) but I wondered if I could use a locking compound or some form of adhesive in there, and hope for reliability. I have heard that "liquid metal" may work.

Thanks.

Rockter.

Last edited by Rockter; 12-11-2011 at 04:13 PM.
Reply With Quote Share with Facebook
  #2  
Old 12-11-2011
Senior Member
 
Join Date: Sep 2010
Location: South Florida
Posts: 152
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
landmineop is on a distinguished road
Send a message via Yahoo to landmineop
Have you considered Helicoil ?
Reply With Quote Share with Facebook
  #3  
Old 12-11-2011
Senior Member
 
Join Date: Sep 2006
Posts: 2,179
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Rockter will become famous soon enough
Landmineop :

It's quite a small thread, and it's tapered. Would a heicoil work?
Reply With Quote Share with Facebook
  #4  
Old 12-11-2011
Senior Member
 
Join Date: Sep 2010
Location: South Florida
Posts: 152
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
landmineop is on a distinguished road
Send a message via Yahoo to landmineop
You could go to their site www.helicoil.com.ag and use the "contact us" to see what they say. It's sure worth a shot. Helicoil inserts are worth their weight in gold at times. Easy to use and strong. I've never had any propblems but maybe I was just lucky. Drop them an email and find out. Only takes a couple of minutes. Good luck and let us know what they say.
Reply With Quote Share with Facebook
  #5  
Old 12-11-2011
Senior Member
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 5,807
Thanks: 2
Thanked 89 Times in 87 Posts
Rep Power: 7
dabnis is on a distinguished road
JB weld, or similar, into the old hole, wait until about half cured and screw the plug in just snug. After fully cured tighten just a little more and then safety wire if there is room. Try to dry the hole before putting the JB Weld into it. Never tried this exact application but have used JB Weld and Marine Tex on other things, it is pretty durable stuff. Not much to lose by trying it, next step could be the Heli - Coil as mentioned above.

Dabnis
Reply With Quote Share with Facebook
  #6  
Old 12-12-2011
TQA's Avatar
TQA TQA is offline
Bombay Explorer 44
 
Join Date: Apr 2009
Posts: 2,254
Thanks: 0
Thanked 24 Times in 21 Posts
Rep Power: 6
TQA is on a distinguished road
Get it dry, clean with cellulose thinners, coat both hole and plug with JB weld and refit.

Let it dry for 48 hrs and refill.

Job Done.
Reply With Quote Share with Facebook
  #7  
Old 12-12-2011
Senior Member
 
Join Date: Oct 2009
Location: Gloucester, MA
Posts: 584
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
klem is on a distinguished road
The correct answer to this is to drill and tap for a larger plug provided that you won't hit anything in doing so. I don't have my copy of Machinery's Handbook with me right now but I would imagine that you would completely drill out the old threads by going to a 1/4 BSPT. You shouldn't have too much trouble looking this up.

If you do drill it out, be very careful not to leave any metal shavings in your cooling system.
Reply With Quote Share with Facebook
  #8  
Old 12-12-2011
Member
 
Join Date: Dec 2010
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
NCboatrx is on a distinguished road
Klem is correct. 1/4"x1/8" BSP reducing bushes are easy to get.
Grease up the tap which should keep most of the thread shavings out of the block. Afterwards clean the area thoroughly.
__________________
Stanley,
Marine Diesel Engine Vendor
Reply With Quote Share with Facebook
  #9  
Old 12-12-2011
Senior Member
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 5,807
Thanks: 2
Thanked 89 Times in 87 Posts
Rep Power: 7
dabnis is on a distinguished road
Quote:
Originally Posted by NCboatrx View Post
Klem is correct. 1/4"x1/8" BSP reducing bushes are easy to get.
Grease up the tap which should keep most of the thread shavings out of the block. Afterwards clean the area thoroughly.
"most of the thread shavings"? The rest may end up going through the pump impeller? Hard to say what, if any, damage they might cause? JB Weld, as mentioned earlier, is tough stuff, maybe worth a try before drilling, if you can get a drill in there.

Dabnis
Reply With Quote Share with Facebook
  #10  
Old 12-12-2011
hellosailor's Avatar
Senior Member
 
Join Date: Apr 2006
Posts: 10,050
Thanks: 0
Thanked 50 Times in 49 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Not being able to see this, but going by "drain plug" and "under"...

I'd also vote for JBWeld. Thoroughly clean and degrease a large area around the hole, and the threads, to make sure it binds well. But since you may want to unscrew a drain plug at some point in the future, I'd go a bit further.

Either drill and tap a new smaller drain plug in the middle of the existing one, or JBWeld a plate over the area around the hole, and (again) drill and tap a new drain plug fitting into the middle of the plate.

So either way, JBWeld, but providing for a new drain plug of some type before you seal it up.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stripped Transmission Dipstick night0wl Diesel 12 07-05-2011 07:14 AM
Possibly a stripped halyard? SiXeVeN Gear & Maintenance 9 06-12-2011 11:00 PM
Deck screws stripped. Kids4sail Gear & Maintenance 4 10-17-2010 04:27 PM
Banjo Bolt Stripped? T37Chef Gear & Maintenance 2 07-11-2008 12:03 AM
Stripped screw hole sklamar Gear & Maintenance 3 05-30-2002 06:10 PM


All times are GMT -4. The time now is 03:08 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012