Just curious....WHERE does the threaded part of your bolts end/start? IF you are going to have a bolt fail, it will most likely fail in the threaded part...I would swap those bolts out for AN bolts and have the threaded part as close to the nut as possible....The bottom holes might need to be re-threaded with a Heli-coil to close up the gap. THAT's why I used studs on the bottom and put the nuts inside the cabin for those two and safety wired them. I double-nutted the top two. I also removed that steel insert on the right top engine mount hole...BobBOB, THANKS I DIDN'T THINK ABOUT THE THREADED PORTION INSIDE THE BUBBER SHOCK MOUNTS. WHAT IF I PURCHASED A LONGER BOLT AND CUT OFF THE THREADS TO MAKE THE BOLT SHORTER W/LONGER SHAFT and leave enough threads to screw into the block? THAT WAY I WOULDN'T HAVE TO INSTALL HELI-COILS. I HAVE NEVER DONE HELI-COILS.I HAVE ABOUT 1 1/2" OF SHAFT ON A 2 3/4" LONG BOLT, AND 1 3/4" OF SHAFT ON A 3" BOLT. SINCE THE TWO RUBBER SHOCK MOUNTS AND TWO LARGE AREA WASHERS ARE A TOTAL OF 2" LONG, I WOULD NEED A 3 1/8" LONG BOLT AND CUT OFF 1/2" OF THREAD TO AVOID INSTALLING HELI-COILS.
I tried to buy grade #5, 10 mm, 2 3/4 inch bolts at NAPA but they only carried grade #8. I'll have to find another source. Here are some pictures using the wrong bolts.
I just stripped out both engine mount holes on the bottom of my engine block.
I carefully ran a tap 3/4 inch into each hole, then cut each bolt to 2 3/4" to make sure they would't bottom out. But, the bolts only turned in about three or four threads.Is there a tightening pattern that would keep me from drawing up one side more than the other, thus causing the bolts to enter the block at an incorrect angle?
Quote from: CHARLES DEBOER on May 14, 2014, 08:08:58 AMI carefully ran a tap 3/4 inch into each hole, then cut each bolt to 2 3/4" to make sure they would't bottom out. But, the bolts only turned in about three or four threads.Is there a tightening pattern that would keep me from drawing up one side more than the other, thus causing the bolts to enter the block at an incorrect angle?Strikes me there is a mismatch between the tap thread & bolt... Drill & tap some scrap material to figure it out... Remember - those are metric holes in the case... Discuss your findings with Leonard - you need a pro opinion on this...
I bought a heli-coil kit from my local auto-parts house and the tap supplied followed the threads in the case quite well with no special tools or alignment... one MUST TRY to be as square as possible at any rate... Follow the instructions on the Heli-Coil Kit....
I did the exact same thing trying to screw my bolts in the bottom two holes.....that's why I had to Heli-Coil them... then I went to studs in the bottom two mount holes!