CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
September 30, 2014, 06:57:35 AM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
104925 Posts in 12259 Topics by 4726 Members
Latest Member: mulder0474
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  Maintenance
| | |-+  302 oil sending hole thread
« previous next »
Pages: [1] Print
Author Topic: 302 oil sending hole thread  (Read 2706 times)
fireZ
Hero Member
*****
Posts: 548



View Profile
« on: August 04, 2008, 05:50:58 PM »

Anyone know what the thread is were the oil sending unit threads into on a 302 engine? I am trying to clean the thread up before installing the sending unit. Thanks
Logged

1968 Z28 LA Built
LIC # RPO Z28
CNorton
Member
***
Posts: 178


View Profile
« Reply #1 on: August 04, 2008, 07:56:51 PM »

1/8th pipe.
Logged
fireZ
Hero Member
*****
Posts: 548



View Profile
« Reply #2 on: August 05, 2008, 07:01:31 AM »

Thanks for the help but I think the owner previous me has run a 3/8 NF 24 down through the hole. Will a heli-coil fix this do you think?
Logged

1968 Z28 LA Built
LIC # RPO Z28
JohnZ
CRG Member
*****
Posts: 4112


View Profile Email
« Reply #3 on: August 05, 2008, 09:38:54 AM »

Thanks for the help but I think the owner previous me has run a 3/8 NF 24 down through the hole. Will a heli-coil fix this do you think?

I'm not aware of a Heli-Coil that will adapt a straight machine thread to a tapered NPT thread, and there isn't much difference in the diameter of a 3/8" machine thread vs. a 1/8" NPT thread to make a typical bushing - not enough wall. You'll probably have to make a custom adapter fitting with a hole through it with 3/8"-24 male threads that screw into the block (and a square shoulder with a gasket to seal it) with a larger top section that has 1/8" NPT female threads to accept the stock adapter fitting. Maybe Jerry has seen this kind of butchery before and has another suggestion.
Logged

'69 Z/28
Fathom Green
CRG
fireZ
Hero Member
*****
Posts: 548



View Profile
« Reply #4 on: August 05, 2008, 09:49:44 AM »

Thanks John, I am very discouraged by what a so called machinist did to my block. I am going to talk to some other machine shops and see if I can get a adapter made to take care of this problem. I guess a matching 68 Z28 motor means nothing to some ,just another motor.
Logged

1968 Z28 LA Built
LIC # RPO Z28
CNorton
Member
***
Posts: 178


View Profile
« Reply #5 on: August 05, 2008, 10:46:41 AM »

There's a "mistake" that's a little more egregious than most.  Anyone who can't feel the difference between chasing a 1/8" pipe thread and cutting threads with a 3/8" machine tap may have made other mistakes as well.  Even the greenest apprentice should have noticed that something wasn't right with the situation.  It makes one wonder.
Logged
fireZ
Hero Member
*****
Posts: 548



View Profile
« Reply #6 on: August 05, 2008, 11:07:32 AM »

I agree with you this guy had to know he was cutting material away. He contends it was already that way when he recieved the block. I am sick about the situation.
Logged

1968 Z28 LA Built
LIC # RPO Z28
JohnKY
Member
***
Posts: 42


View Profile Email
« Reply #7 on: August 05, 2008, 11:33:36 AM »

Can you drill it out, and re-tap with 1/4" NPT? Then, use a 1/4 X 1/8 bushing.
Logged
fireZ
Hero Member
*****
Posts: 548



View Profile
« Reply #8 on: August 05, 2008, 12:04:22 PM »

Yes I think it will have to be drilled out and then basically sleeved before it is retapped
Logged

1968 Z28 LA Built
LIC # RPO Z28
fireZ
Hero Member
*****
Posts: 548



View Profile
« Reply #9 on: August 07, 2008, 12:32:48 PM »

I tried what John Z mentioned and it worked perfectly. It took a little work  to make the bushing with a male thread but in the end it worked. Another 68 Z motor saved for the original car, Thanks everyone
Logged

1968 Z28 LA Built
LIC # RPO Z28
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.11 seconds with 17 queries.