broken bolt hole
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Joined: May 2003
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broken bolt hole
i have a 1979 460 f100 that i took the motor out to do some minor work to. i have the engine on a motor stand and today when i was spinning the motor one of the bolt holes that connect to my transmission broke midway in. what can i do about this problem? do i have to scrap my block???
Senior User
Joined: Feb 2003
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From: Waterbury, CT.
broken bolt hole
Ok, do you mean to say, you were turning over the engine by hand, and one of the bolts holding it to the engine stand ripped out and took the threads with it? Or did you actually break the casting around one of the bolt holes?
For sake of conversation, I've had only five bolts in my tranny since I did the clutch in '97. Now I just did the clutch again a couple of months ago, and when I took the tranny out, the five bolts were still in there nice and tight, and there was no ill effects from running the diesel on five tranny bolts.
For sake of conversation, I've had only five bolts in my tranny since I did the clutch in '97. Now I just did the clutch again a couple of months ago, and when I took the tranny out, the five bolts were still in there nice and tight, and there was no ill effects from running the diesel on five tranny bolts.
Last edited by Freight Train; May 22, 2003 at 10:12 PM.
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broken bolt hole
the bolt was in the hole and i had the front end of the motor supported with my cherry picker to and when i lowerd the cherry picker the pressure on the hole snapped the hole midway in so the hole is now open on the top end and its only half there
Posting Legend
Joined: Sep 2001
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broken bolt hole
Take it to the machine shop. Sometimes it is possible to drill and tap the hole for a Helicoil or larger size bolt or plug then re-drill & tap the plug for the proper size. Otherwise you will be looking at running one less bolt like Freight Train did...
Senior User
Joined: Feb 2003
Posts: 253
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From: Waterbury, CT.
broken bolt hole
Ok, it sounds like it can be welded, then re-tapped. Time for a machine shop. I think I would send that bad boy back in on 5 bolts, then for piece of mind, just re-torque them after a few days.
Cut a 2X4 to fit between the floor and the balancer. Use grade 10 bolts long enough to go in at least 1 full inch of thread, and these things won't happen again.
Good luck,
Jared
Cut a 2X4 to fit between the floor and the balancer. Use grade 10 bolts long enough to go in at least 1 full inch of thread, and these things won't happen again.
Good luck,
Jared
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Posting Legend
Joined: Sep 2001
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broken bolt hole
From David-
"i was under the impression that you can't weld cast???"
You can weld cast but I don't like the results usually. I normally braze cast iron.
-sorry about loosing your post. I was trying to fix the "server busy" multiple posts from FT.
"i was under the impression that you can't weld cast???"
You can weld cast but I don't like the results usually. I normally braze cast iron.
-sorry about loosing your post. I was trying to fix the "server busy" multiple posts from FT.
Last edited by Torque1st; May 22, 2003 at 11:25 PM.
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Senior User
Joined: Feb 2003
Posts: 253
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From: Waterbury, CT.
broken bolt hole
You can weld cast iron with a few preps first. Put a mark around the area with a temp indicating paint pen, heat the area with a rosebud intil you hit 425 degrees, and zap it with an EST rod on a DC welder. My big 'Stinkin Lincoln sa200 works like a charm for this.
I've done more exaust manifolds than I can count, some blocks, and my favorite, exaust manifold bolt holes.
Sorry about the multiple's, 79Lariot just had the same problem over in the general forum with a good run of about 14 postings. hehe
I've done more exaust manifolds than I can count, some blocks, and my favorite, exaust manifold bolt holes.
Sorry about the multiple's, 79Lariot just had the same problem over in the general forum with a good run of about 14 postings. hehe
Last edited by Freight Train; May 22, 2003 at 11:34 PM.
