UPDATE: Fixed the first problem (got someone to drill it out perfect ) Now I just need to figure out how to do the stripped trans threads. I bought a Helicoil insert thats 12 X 1.25 but I have no idea how to use these things

I was switching my B16 block out to my C1 block yesterday and ran into a couple problems.

1) On the driver's side upper mount bracket, the threads on this GSR block where the 3 bolts of bracket bolt onto the block are made for a 17mm bolt but were 14mm on my B16. I'm not sure whether the threads on the block were tapped out from the previous owner or if GSR brackets in fact use 17mm bolts. I tried to just drill out the holes on the bracket itself to fit the 17mm bolts but my friend says he couldn't do it because the bracket is probably heat treated cast iron (correct him if he's wrong) and he claims its almost impossible to drill out with a normal drill press. What should I do?

2) 2 of the threads on the block where the tranny mounts onto the block are stripped out. I was looking into a Helicoil kit but I'm not sure if it'll last or what size to get. Or I was going to tap the block but then I'd have to drill out the tranny too...

What a headache


Modified by SkoundrelUSA at 3:29 PM 8/24/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkoundrelUSA &raquo;</TD></TR><TR><TD CLASS="quote">

What a headache </TD></TR></TABLE>

i can imagine. damn that sucks, i would guess the best thing to do is drill everything out and tap. that's what i'm think, the most logical anyway.

 

Do you know if in fact a bracket is made of cast iron and heat treated?

This is the piece I'm talking about if anyone doesn't get what I'm talking about



See how there's those 3 holes on the right side. I need to know if its possible to drill out like another 2 millimeters.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkoundrelUSA &raquo;</TD></TR><TR><TD CLASS="quote">Do you know if in fact a bracket is made of cast iron and heat treated?

This is the piece I'm talking about if anyone doesn't get what I'm talking about



See how there's those 3 holes on the right side. I need to know if its possible to drill out like another 2 millimeters.</TD></TR></TABLE>

yeah i get what your saying. you can drill it. pick up some titanium bits and drill away. noticed i said a couple of bits.

 

for what you are doing the helicoil will be plenty strong just make sure the you get them in nice and strait. As for the bracket drill it out use a good sharp drill bit and plenty of cutting oil, remember to go slow and let the bit do the cutting.

 

1. I dont get it, what bolts are 17mm to hold the bracket? Those bolts are i believe 12m x 1.25 with a 14mm head. I dont see why you couldnt use your 14mm bolts in it since all B series and D series are the same. But if you do need to drill out your holes for the bracket for whatever reason and you have a press go VERY slowly with alot of lube so you dont expletive the bit.

2. See if you could run a tap through, if not then helicoil is your only choice.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luserkid &raquo;</TD></TR><TR><TD CLASS="quote">1. I dont get it, what bolts are 17mm to hold the bracket? Those bolts are i believe 12m x 1.25 with a 14mm head. I dont see why you couldnt use your 14mm bolts in it since all B series and D series are the same. But if you do need to drill out your holes for the bracket for whatever reason and you have a press go VERY slowly with alot of lube so you dont expletive the bit.
</TD></TR></TABLE>

Yeah I know they're not suppose to be 17mm but it looks like the previous owner drilled/tapped the threads on the block to fit a 17mm now. (I had no idea till I went to install it) You think drill the hole bigger is possible though? Without the bracket like cracking or anything?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luserkid &raquo;</TD></TR><TR><TD CLASS="quote">2. See if you could run a tap through, if not then helicoil is your only choice. </TD></TR></TABLE>

Thing is I really prefer not having to tap it because then I'd have to drill out the tranny holes also to fit a 18/19mm (or w/e it will be tapped out to) which kind of scares me...

Yeah I'm trying to look for a Helicoil kit but don't know which one to buy...Is JB welding the bolts on a bad idea? lol

 

oh i see. The pervious owner drilled in and made it so it runs bigger bolts? Thats dumb. But yea it should be safe to drill the bracket provided your really straight and dont thin out the material to much.

The tap can be used as a thread chaser as well. If you just run a tap through the way it is you should be fine. But if you really want to do a Helicoil thats an option too.

 

If it's been tapped out that much bigger, then a helicoil isn't going to work. The hole gets tapped out just a hair bigger than the original size to put a helicoil in it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rmcdaniels &raquo;</TD></TR><TR><TD CLASS="quote">If it's been tapped out that much bigger, then a helicoil isn't going to work. The hole gets tapped out just a hair bigger than the original size to put a helicoil in it.</TD></TR></TABLE>

No no no, the stripped threads on the block were not tapped. They just simply just stripped threads from over tightening the tranny onto the block I guess.

The threads which were tapped to 17mm are the threads for the driver side upper mounting bracket.

Its 2 separate problems.

 

DOH! I stripped a tranny mounting hole in my block out once. Thankfully the holes in the tranny are slightly bigger than the holes on the block, so I just tapped it out with a slightly bigger SAE tap and put a slightly bigger bolt in it. That was kind of half-assed, but at least I didn't have to pull the tranny. Ideallly you'd pull the tranny and heli-coil it.

On the other thing I'd try drilling the bracket.

 

haha ur from minnesota

my friend was gunna do a K-swap at hand command but is buying a subie instead. gl with the problem

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTECommie &raquo;</TD></TR><TR><TD CLASS="quote">haha ur from minnesota

my friend was gunna do a K-swap at hand command but is buying a subie instead. gl with the problem
</TD></TR></TABLE>

lol wtf? No I'm not.

Ok...

 

Ok, it doesn't look like I'm gonna be able to drill this thing out. Unless I fork up the cash for $75 bits. Is there ANY way to make the 17mm back to a 14mm?

 

I'd just take it by my local machine shop. They will have a nice drill press and expensive drill bits and probably just charge you a few $ because it will only take them a few minutes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkoundrelUSA &raquo;</TD></TR><TR><TD CLASS="quote">Ok, it doesn't look like I'm gonna be able to drill this thing out. Unless I fork up the cash for $75 bits. Is there ANY way to make the 17mm back to a 14mm?</TD></TR></TABLE>

If you want to do that you could but i wouldnt. Youll have to seal up the area completely then retap it. It would seriously require machine work. Send the bracket to a machine shop to have it drilled a little bigger.

 

Well I just dropped it off at a machine shop in town. I just hope it doesn't crack/snap.

Do you think drilling it out will weaken the bracket at all?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkoundrelUSA &raquo;</TD></TR><TR><TD CLASS="quote">lol wtf? No I'm not.

Ok...</TD></TR></TABLE>

He said that because of the picture there is a stock there that says Handcommand and thats a local minnesota shop.

 

Well came back from the local welder. He couldn't do it with a Titanium drill bit. This sucks

 

Local welder or local machine shop? If you send it to me i could probably have it done. But sadly i dont know what type of turn around time im looking at.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luserkid &raquo;</TD></TR><TR><TD CLASS="quote">Local welder or local machine shop? If you send it to me i could probably have it done. But sadly i dont know what type of turn around time im looking at. </TD></TR></TABLE>

Welder. He recommended me going to this other place. They had a carbnide drill bit and charged me $15 to do it. It worked. I am very happy lol.

Now I just gotta deal with the trans threads. I bought the helicoil inserts off ebay (12mm X 1.25) but I have no idea how to use them. Do I just put it in and thread the bolt on or do I need to tap it or something?

 

You need a special Helicoil tap for the insert that you want to use. I buy them at Ace Hardware. Plus you need an insertion tool for that specific insert. It all comes in a kit.