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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 10-13-2015, 06:44 PM   #1 (permalink)
LordImpala
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Bonehead of the year. Starter Bolt

Hey guys,

I was trying to remove a broken starter bolt. I was over zealous and drilled into the block. When I pulled out, coolant was draining out of the hole. The hole is 5/32. Can this be filled with black silicone, braze, welded, plugged? Thanks for all the help.

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Old 10-13-2015, 06:56 PM   #2 (permalink)
njsteve
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How about drilling and tapping for a screw in pipe plug?

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Old 10-13-2015, 07:00 PM   #3 (permalink)
wallyworld
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Did you get the broken piece out and are the threads in the block ok? If so I wonder if you could put some kind of sealant on a new starter bolt and just screw it in. Be kind of like a head bolt that goes into coolant? other than that welding is the only way I can think of and I doubt you could do that in the truck
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Last edited by wallyworld; 10-13-2015 at 07:00 PM.
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Old 10-13-2015, 07:13 PM   #4 (permalink)
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I was thinking that too wally world. Use black silcone, and something for the treads. I also like the plug idea. Coolant is coming out as I type this. Bolt still needs to be removed. Hopefully the threads are in good shape. I had trouble with the drilling and am real close to the edge of bolt.
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Old 10-13-2015, 11:01 PM   #6 (permalink)
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Trouble is that you drilled off the bolt to the side? Or all the way through the bolt?
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Old 10-14-2015, 09:14 AM   #7 (permalink)
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Trouble is that you drilled off the bolt to the side? Or all the way through the bolt?
i am close to the side, and went through the bolt into the engine block.
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Old 10-14-2015, 09:51 AM   #8 (permalink)
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How close is that water jacket to the bolt hole? What happens if somehow the bolt cracks the edge of the block/bolt hole? Get a new engine?
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Old 10-14-2015, 02:03 PM   #9 (permalink)
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I'd fill the hole with RTV or maybe even JB Weld. To top it off, some Permatex thread sealant on the bolt would help, a sealant that doesn't harden, so the bolt and threads arn't an issue later.
Teflon tape isn't a sealant, all it does is make threads slipperier, so that threads can tighten a little more and lock into place.
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Old 10-14-2015, 03:24 PM   #10 (permalink)
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Ewww... on the plus side, you now have an easy to reach block drain for the drivers side...

I would flush the block, get the hole uber clean and squirting in some jbweld and coat the bolt with anti seize and bolt it together, wait the full cure time for the jb, then clean up the starter mount face and put the starter in and pray... pray hard.

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