Cylinder head-re installation, chasing head bolt holes
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Cylinder head-re installation, chasing head bolt holes
Hi everyone. I'm in the process of installing a new head on my 22re and can't find a tap to clean out the head bolt holes into my block. Its a M12x1.25 tap that's needed. All I can find is 12x1.5 and 12x1.75. At my local parts store they don't even have one in the catalogue. Since I cant find one anywhere my only option seems to be to clean up one of the old bolts and use it to clean the holes out as best I can, which feels like a very mickey mouse way of doing things to me. Anyone have any insight or ideas??
#2
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The M12x1.25 is a fairly common tap.
Your local parts guys need to dig a little deeper, if one tool company does'nt have the tap, another one will.
You can get one shipped from China for $7.80US on Ebay.
http://www.ebay.com/itm/New-12mm-1-25-Metric-HSS-Right-Hand-Tap-M12x1-25-Pitch-/170917947756?pt=LH_DefaultDomain_0&hash=item27cb80e96c
Your local parts guys need to dig a little deeper, if one tool company does'nt have the tap, another one will.
You can get one shipped from China for $7.80US on Ebay.
http://www.ebay.com/itm/New-12mm-1-25-Metric-HSS-Right-Hand-Tap-M12x1-25-Pitch-/170917947756?pt=LH_DefaultDomain_0&hash=item27cb80e96c
#3
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Order online if the local store doesn't carry. I got a whole irwin metric tap set for less than 30 bucks online. Covers 3-12mm with coarse, medium and fine pitches.
#4
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Got tired of going to store after store looking for specific taps and finding every one but the one needed.
Harbor freight has a large tap set for less than 100 bucks as well.
Harbor freight has a large tap set for less than 100 bucks as well.
#5
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Using a tap when you should be using a thread chaser can loosen bolt holes and skew torqie readings.
I'd by a chaser and do it right. They dont remove material. Taps do.
I'd by a chaser and do it right. They dont remove material. Taps do.
#6
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If you ordered a new set of head bolts, use an old one. I had the same problem. My tap set didn't have the right TPI. I purchased new head bolts and took an old one then cut a slot perpendicular to the threads with a cutoff wheel. The reason for the cut is to allow the debris a place to collect. It worked like a charm!!!
You really should get a new set of head bolts.
You really should get a new set of head bolts.
Last edited by 93 Toyota 4x4; 12-19-2013 at 01:27 PM.
#7
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Hi everyone. I'm in the process of installing a new head on my 22re and can't find a tap to clean out the head bolt holes into my block. Its a M12x1.25 tap that's needed. All I can find is 12x1.5 and 12x1.75. At my local parts store they don't even have one in the catalogue. Since I cant find one anywhere my only option seems to be to clean up one of the old bolts and use it to clean the holes out as best I can, which feels like a very mickey mouse way of doing things to me. Anyone have any insight or ideas??
Also, try http://www.mcmaster.com/#
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#8
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Hi everyone. I'm in the process of installing a new head on my 22re and can't find a tap to clean out the head bolt holes into my block. Its a M12x1.25 tap that's needed. All I can find is 12x1.5 and 12x1.75. At my local parts store they don't even have one in the catalogue. Since I cant find one anywhere my only option seems to be to clean up one of the old bolts and use it to clean the holes out as best I can, which feels like a very mickey mouse way of doing things to me. Anyone have any insight or ideas??
#9
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Chase the threads. I bought my thread chaser set from Sears. It was in the neighborhood of $30 or $40.
#10
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if you can afford it, use new head bolts, at the very least, inspect each bolt for wear, stretching etc . And use a thread chaser only. You live in Canada, Canadian Tire has them for loan, leave a deposit, use it, bring it back and get deposit back.
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I bought new head bolts and cut the end off one of my old bolts to clean it up. I didnt have the time to wait for a chaser because of the gong show that is the week before christmas and needing my truck put back together quick. Thanks for the tips.
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I just re-torqued my head bolts after a few hundred kms and they were surprisingly loose. My haynes manual and the manufacturers recommended specs are both 58ft-lbs which seems pretty low. Anybody go above that?
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