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  #1  
Old 07-19-2007, 01:28 PM
1984 300SD
 
Join Date: Feb 2007
Location: Vancouver BC
Posts: 588
Radiator Recovery

I leaned on the hose to the expansion tank and snapped off the hose barb. After pricing a new radiator I came up with an easy fix. Here are some notes and pictures of the fix.
I used a very sharp wood chisel to cut away the remaining piece of the hose barb and smooth the area. Using a step drill I drilled out the hole to just under 3/8”.
I removed the top rad hose and ran a thin coat hanger in through the 3/8” hole and out the large hose barb. Don’t let the wire contact the aluminum radiator core
I got a 1 ¼ x 3/8 SS bolt, threaded all the way. Set it up in the lathe to drill a 3/16” hole through the bolt. Next turn down the head to round it off so as to fit through the hole squarely. Remount the bolt with the head in the lathe chuck and a live center at the outer end. Turn off ¾” of thread for the hose to slide on. Place the bolt on the wire and bend over to hold the bolt on. Draw the wire with bolt back through the rad top and out the 3/8” hole. Slide the washer and nut down the wire and fasten. The bolt will make a tight fit in the drilled hole that is just under the bolt size.
Remove the wire out through the top hose barb. Finished

Attached Thumbnails
Radiator Recovery-dsc01182.jpg   Radiator Recovery-dsc01183.jpg   Radiator Recovery-dsc01185.jpg   Radiator Recovery-dsc01187.jpg  
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1984 300SD turbo 126
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Last edited by The Gears; 07-19-2007 at 01:31 PM. Reason: Title correction
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  #2  
Old 07-19-2007, 01:31 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
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Um, can you sell us pre lathed bolts...
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Old 07-19-2007, 01:31 PM
vstech's Avatar
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Location: Mount Holly, NC
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I am thinking brass bolts would be better
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #4  
Old 07-19-2007, 09:11 PM
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Join Date: May 2007
Location: florida
Posts: 677
Great fix
My$.02 Don
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  #5  
Old 07-20-2007, 09:29 AM
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Join Date: Nov 2006
Location: FL
Posts: 507
I tried something similar

When I leaned on mine and broke the nipple, I tried to do something simlar, but found the plastics in this area way too thin and brittle to be a permanent solution. If it is the original, I would predict all the top plastic to be in a similar state, especially if non MB coolant was used over the life of the radiator.

Watch it last forvever, but don't be suprised if it fails.
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  #6  
Old 07-20-2007, 09:44 AM
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Join Date: Nov 2002
Location: Dallas
Posts: 802
love good engineering ideas!

As a victim of the same snafu (and bought a new radiator) - that's slick! You should make 20-30 of them and sell them.
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  #7  
Old 07-20-2007, 12:30 PM
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Location: Tampa, FL
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I used quicksteel the first time, but that didn't work out well. Eventually broke it again (performing the same task as last time! When will I learn?) This time I used jb weld and it worked great, no leaks, no problems.
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  #8  
Old 07-21-2007, 12:56 PM
1984 300SD
 
Join Date: Feb 2007
Location: Vancouver BC
Posts: 588
Thanks for your replies

You are all correct. The top plastic is very thin, only 1/16" or less and very brittle.

To build up the area with JB Weld then smooth it out prior to drilling would help. I am suprised that this material will stick to this particular plastic.

Next time I do this job (i hope never) I will file the hole in a down direction to allow more space between the top of the hole and the top inside edge of the shell for bolt head clearance.

I used SS bolt because it won't react with the Aluminum core.

Next time I work on the alternator I will remove the hose from the rad.

If anyone needs one I can make it up and stick it in the mail.

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1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

Last edited by The Gears; 07-22-2007 at 01:36 PM.
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