Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-16-2018, 08:34 PM   #1
Senior Member
 
Tator's Avatar
 
City: Bainbridge Island/Petersburg Alaska
Vessel Name: Oz
Vessel Model: Bluewater 40' RPH 1979
Join Date: Feb 2015
Posts: 348
Onan MDJE broken exhaust nipple

The exhaust nipple on my Onan 7.5 MDJE located between the exhaust manifold and the injector elbow broke off this weekend. Does anybody on the forum have experience replacing this item and any tricks they can impart to me? Is the nipple a standard steel or black iron nipple? How would one extract the part of it that is broke off flush with the injector elbow? Thanks.

Tator
__________________
Advertisement

Tator is offline   Reply With Quote
Old 06-17-2018, 01:05 PM   #2
Guru
 
Lepke's Avatar
 
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,328
There are "easy outs" to fit pipe. If the break has rust it's probably steel. You need a penetrating oil that includes a mild acid. It eats the rust in steel and cast iron making the threads looser. Heat applied to the elbow may help, but if the elbow is cast iron too much heat can crack it.
An alternate method is to insert a metal cutting blade into the fitting and cut thru the full length of the pipe fitting just to where the threads show. Then with a punch and hammer, hit the edge of the pipe on both sides of the cut, collapsing it toward the center. Work your way down the cut line and the fitting eventually becomes loose. Easier if you take the elbow off to somewhere it's easy to work on. Or once the elbow is off, take it to a machine shop.
__________________

Lepke is online now   Reply With Quote
Old 06-17-2018, 01:34 PM   #3
Senior Member
 
TowLou's Avatar
 
City: Flanders, NJ
Vessel Name: Bassey
Vessel Model: 17' Bass
Join Date: Aug 2016
Posts: 221
If you have to drill it completely out there are ways you can retap the hole. Commonly used in the auto field called Heli coils if you need to drill the whole plug out. As another remedy. If that is a option.
TowLou is offline   Reply With Quote
Old 06-17-2018, 02:21 PM   #4
Guru
 
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,257
Do you have a torch? If so you could melt the steel leftover shell from the threads while prying it with a screwdriver to collapse it in on itself.

Or, carefully using a jigsaw, cut the inside of pipe but don't get into the threads, do this on 2 sides, the using a hammer and cold chisel-screwdriver whack the remains inward.
sdowney717 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 03:30 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×