As the title suggests, my engine build has come to a screeching halt when the very last head bolt yanked the threads out of the block. Vehicle is a 2004 Honda Odyssey with 3.5L V6, all aluminum. The torque sequence on this cylinder head is 23-51-73 -- start at the lower value, torque each bolt twice, then move to the next, etc.. The threads in question failed when I was trying to apply the 51 lb-ft, so they were likely garbage to begin with.
This engine is apart because I discovered a bad cylinder head gasket shortly after buying the vehicle. Interestingly enough, the failed threads are in the same location that the head gasket failed-- coincidence?
All that said, what are my options for repair? This is a daily driver, not a boosted track vehicle or hot-rod, so I need a general purpose repair that will last and nothing more.
The repair has me a bit frightened, because the block is in the vehicle and I certainly don't want to go through all the work of removing it again-- that would be a royal pain in the arse. There is plenty of space to work around this particular bolt hole, however. Is it possible to tap to an oversize thread size (stock bolts are 12mm-1.50)? Helicoil? Tap the upper portion of the bolt hole, and use a new bolt that doesn't go so far in the block?
Need help from someone who's done this before-- I came across this link and it seems like this would be right up my alley, but not sure if this is a valid repair option:
http://southeastcylinderhead.com/aluminum-block-head-bolt-thread-repair/
Any help, info, suggestions, etc. on how to go about fixing this would be much appreciated. I need to get this vehicle back on the road, and this is the only thing holding me up. Thanks in advance!
This engine is apart because I discovered a bad cylinder head gasket shortly after buying the vehicle. Interestingly enough, the failed threads are in the same location that the head gasket failed-- coincidence?
All that said, what are my options for repair? This is a daily driver, not a boosted track vehicle or hot-rod, so I need a general purpose repair that will last and nothing more.
The repair has me a bit frightened, because the block is in the vehicle and I certainly don't want to go through all the work of removing it again-- that would be a royal pain in the arse. There is plenty of space to work around this particular bolt hole, however. Is it possible to tap to an oversize thread size (stock bolts are 12mm-1.50)? Helicoil? Tap the upper portion of the bolt hole, and use a new bolt that doesn't go so far in the block?
Need help from someone who's done this before-- I came across this link and it seems like this would be right up my alley, but not sure if this is a valid repair option:
http://southeastcylinderhead.com/aluminum-block-head-bolt-thread-repair/
Any help, info, suggestions, etc. on how to go about fixing this would be much appreciated. I need to get this vehicle back on the road, and this is the only thing holding me up. Thanks in advance!