What Size Taps And Dies Needed For A Rebuild?
03-11-2004, 12:04 AM
#1
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Join Date: Oct 2001
Location: Peoria, AZ
Posts: 10,906
I have a 60+ piece tap/die set but I'm sure it won't cover all the studs/bolts/holes that should be cleaned and rethreaded when doing a motor rebuild. Could someone list them out for me? Specifically front iron T bolt holes, T-bolts, oil pan bolt holes/bolts, and maybe the waterpump studs and any others that you guys can come up with.
03-11-2004, 04:46 AM
#2
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Posts: 2,284
Judge Ito once said it's ok to chace the 10mm x 1.00 tension bolt holes in the front plate. I personally have never needed to chace any threads other than a few 10mm x 1.5 exhaust stud holes in the rotor housings when I needed to replace one or two of them. Don't forget 10mm x 1.25, although chacing threads in general is not necessary unless something happened to damage them.
03-11-2004, 02:49 PM
#6
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False? Meh, I might as well now that I have a 10mm x 1.00 tap. They're less common than 10mm x 1.25 and 10mm x 1.5. I may even boost this engine although I'm not sure how well the '74-'75 rotor housings will hold up. Oh well, if it blows, I'll just get a T2 engine. 
30 foot lbs on tension bolts, right?
30 foot lbs on tension bolts, right?
03-11-2004, 03:26 PM
#7
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Location: California
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Originally Posted by Jeff20B' date='Mar 11 2004, 12:49 PM
False? Meh, I might as well now that I have a 10mm x 1.00 tap. They're less common than 10mm x 1.25 and 10mm x 1.5. I may even boost this engine although I'm not sure how well the '74-'75 rotor housings will hold up. Oh well, if it blows, I'll just get a T2 engine.
30 foot lbs on tension bolts, right?
30 foot lbs on tension bolts, right?
03-12-2004, 02:55 AM
#10
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Hey, I chased several threads today. Some of the tension bolt holes were tight while others were easy to spin in by hand. Most were medium. I'm glad I decided to chase them. I also chased the front cover holes (8mm x 1.25) because some of the bolts were rusted in. Luckily none broke during teardown. I found a set to replace them with good used bolts. I also chased a couple of the engine stand mounting holes (12mm x 1.5 and 10mm x 1.25) and now the front plate is held by all four arms. It's ready to go together after I 'build' the rotors.
Mike, since this engine may be boosted, and the rotor housings are a bit old, should I do 27-28?
Mike, since this engine may be boosted, and the rotor housings are a bit old, should I do 27-28?