Broken engine mount bolts.

[LAWALLSTRACTOR]

Hi everbody,
I usually try to help others here, but now need some assistance myself. After 8 years with Mahindra, I have run into my first instance of broken off engine mount bolts. I found the problem when doing routine service on a Mahindra 2810 HST. I called my customer and told him I had found 2 broken off bolts and that I thought they should be replaced. He agreed and told me that he had found them loose before and had removed them and put them back in with locktite. The bolts are a M12 with 1.25 thread and they are a hardened bolt. They are broken off at about 1/4" into about the engine block. Considering the outer 1/4" of threads in the block are damaged, I thought that the course of action should be to drill out the whole bolt, rethread the hole and replace the bolt. I heated the bolt left in the hole to remove the temper in the bolt, but I still can't drill it . Does anyone have any suggestions. Any help would be greatly appreciated.

 

[Outlander]

Carbide drill bit should do it. Go slow and lubricate. Carbide bits can be a tad brittle.

 

[tommu56]

LAWALLSTRACTOR
I' try a bottoming tap in the hole to fix the threads that are damaged and then try and turn it out.

Heat it again and quench it with water that might take temper out.

carbide like Outlander suggested.
start small on the regular bits 1/8" is a good start size.

I like to use sheet metal bits short shank and short flute = stronger bits.

We had a sales guy in selling some super duper welding rods and he put a nut over the hole just like you described and ran a bead of weld on what was left of the bolt and up inside the nut and he just spun out the bolt with the nut.
I never was that good of a welder but he had that "demonstration down pat".

tom

 

[thomass38]

Hi everbody,
I usually try to help others here, but now need some assistance myself. After 8 years with Mahindra, I have run into my first instance of broken off engine mount bolts. I found the problem when doing routine service on a Mahindra 2810 HST. I called my customer and told him I had found 2 broken off bolts and that I thought they should be replaced. He agreed and told me that he had found them loose before and had removed them and put them back in with locktite. The bolts are a M12 with 1.25 thread and they are a hardened bolt. They are broken off at about 1/4" into about the engine block. Considering the outer 1/4" of threads in the block are damaged, I thought that the course of action should be to drill out the whole bolt, rethread the hole and replace the bolt. I heated the bolt left in the hole to remove the temper in the bolt, but I still can't drill it . Does anyone have any suggestions. Any help would be greatly appreciated.

I also have a 2810hst and would like to know which bolts broke. I would like to check my bolts to make sure they are tight.
Thanks TOM

 

[Gator6x4]

One trick I have seen used to extract a broken bolt was grind a small nut into a round nut so that it will fit into the hole where the broken bolt is. Weld the nut to the bolt and then weld another nut to this to provided something for a wrench to turn. The heat from the welding also helps in loosing the bolt. The use of locktite on the bolt will make extraction even harder. This is why you probably got the "JOB". Good luck.

 

[bindian]

Galen,
Carbide bits are real brittle. I prefer cobalt bits over carbide bits. I have Boelube lubricant I use for drilling steel. It is like a wax and is the cat's meow for cooling and lubricating steel while drilling. BOELUBE PRODUCTS from Aircraft Spruce It was designed for drilling titanium on the B-58 bomber. With the locktite, heat will be needed for sure. Just a propane torch worked for my broken bolt (approx. 3/4 inch diameter) on my backhoe subframe. I would not quench it with anything, since you are in an engine block and quenching is used for hardening. I gather this is about a 7/16th inch diameter bolt?
hugs, Brandi

 

[AHNC]

I had this happen on a Mercedes block many years ago. I had no money and had to fix it myself. Lots of Boelube and a raft of 1/8" cobalt bits as suggested. Get comfortable because you will likely be there for a while. Don't get impatient and drill to shallow a hole as the easy out may snap off and then, well, it isn't pretty.

 

[bindian]

Galen,
With the Boelube block, just drill a little to get the bit warm, then dip it into the block. Keep doing this every 5 or so seconds.
hugs and Good Luck, Brandi

 

[MississippiMan]

Seems to be a lot of stuff breaking off of people's Mahindras lately.

 

[bindian]

Seems to be a lot of stuff breaking off of people's Mahindras lately.

MississippiMan,
I guess a lot of folks are working their Mahindras as hard as I do. If they were lighter in weight like the competition, there would a lot more breakdowns.
hugs, Brandi

 

[bindian]

Galen,
How about an update?
hugs, Brandi

 

[skipmarcy]

Galen - I have to agree with the cobalt bits, but good ones. I get mine from Snap-On, have tried a few offbrands but they didn't last long, I'm sure some of the other name-brand cobalts are just as good. I've been removing broken hard bolts in some awful places in autos for almost 40 years and the cobalts are the ticket !! They can be brittle too, like the carbide, so you have to get the speed right - not too slow and not too fast and of course as already mentioned, plenty of lube. I'm sure you'll get 'er done.

Skip

 

[art]

MississippiMan,
I guess a lot of folks are working their Mahindras as hard as I do. If they were lighter in weight like the competition, there would a lot more breakdowns.
hugs, Brandi

Per sales numbers most would say they are broke a little more. The engine problem goes back to the manufacturer of the tractor for them. It's not the first time around this block!

 

[AchingBack]

I wouldn't call this an engine problem, art. It sounds like it is a people problem. Perhaps the tractor owner over tightened the bolts. If so, that could easily have caused this to occur. Perhaps the worker at the factory didn't do their job correctly.

 

[art]

I wouldn't call this an engine problem, art. It sounds like it is a people problem. Perhaps the tractor owner over tightened the bolts. If so, that could easily have caused this to occur. Perhaps the worker at the factory didn't do their job correctly.

It isn't the first time around for that tractor chassis to be having problems with the engine bolts breaking off and coming loose. I've always been a little to short on patience for the job of drilling out broken bolts. It always makes me cringe when I see them!

 

[jwcinpk]

Per sales numbers most would say they are broke a little more. The engine problem goes back to the manufacturer of the tractor for them. It's not the first time around this block!

So you're saying the problem lies with TYM not Mahindra?

 

[LAWALLSTRACTOR]

I am updating you on the 2810 engine mount bolts. The one on the right side drilled out fine, but I couldn't turn it out with and easyout. I drilled it out to size tapped it with the original M12-1.25, then installed a new bolt with locktite, and torqued it to the recommend 70 foot pounds.The one on the left side I never was able to drill it, but that one was broken off almost 1/2 in into the block. I drilled the block out to the broken bolt and tapped it to a M14-1.5 bolt, then installed the shorter bolt with locktite. I then made sure the rest of the motor mount and loader bolts were properly locktited and torqued. Thank you, everybody for your suggestions and help.

 

[bindian]

I am updating you on the 2810 engine mount bolts. The one on the right side drilled out fine, but I couldn't turn it out with and easyout. I drilled it out to size tapped it with the original M12-1.25, then installed a new bolt with locktite, and torqued it to the recommend 70 foot pounds.The one on the left side I never was able to drill it, but that one was broken off almost 1/2 in into the block. I drilled the block out to the broken bolt and tapped it to a M14-1.5 bolt, then installed the shorter bolt with locktite. I then made sure the rest of the motor mount and loader bolts were properly locktited and torqued. Thank you, everybody for your suggestions and help.

Galen,
Is just 1/2 inch of thread gripping that bolt or where you able to take it deeper? Either way.........you da Man.

 

[Keith_B]

So you're saying the problem lies with TYM not Mahindra?

I thought the 2810 HST and the 2810 were two completely different tractors?

Either way Mahindra had those tractors built and rebadged. FWIW, at one point TYM built tractors for Massey Ferguson.

 

[JerryG]

I thought the 2810 HST and the 2810 were two completely different tractors?

Either way Mahindra had those tractors built and rebadged. FWIW, at one point TYM built tractors for Massey Ferguson.

TYM didn't build any Masseys. Iseki built transmissions, dashes and rear fenders etc for TYM. Iseki builds Massey compacts. So the TYM's, Mahinda's and Massey's do have somethings at least similar.