#1  
Old 02-15-2022, 05:59 PM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default Oil Restrictor Tube

Can anyone tell me how the restrictor tube is removed from the head? I have a feeling that mine is the older style with the "too large" hole, but I need to check it out. Hoping this is the cause of #5 being a dead hole...

  #2  
Old 02-15-2022, 07:28 PM
Hokie1984 Hokie1984 is offline
Senior Member
 
Join Date: Sep 2017
Location: Blacksburg, VA
Posts: 137
Default

I used an easy out and threaded it into the restricter. Then pulled it out. Don’t go crazy on the easy out.

  #3  
Old 02-16-2022, 11:54 AM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default

Does it matter which way the hole in the restrictor faces in the head?

Pulled the old one out last night and it is indeed the .125", making a new one now.

  #4  
Old 02-16-2022, 07:54 PM
Jeff Hamlin's Avatar
Jeff Hamlin Jeff Hamlin is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: Beach side of Virginia
Posts: 9,371
Default

No, it can be set in any direction, as long as the metering hole is within the galley/pocket your good.
Attached Thumbnails
Click image for larger version

Name:	SAE FLOW.jpg
Views:	216
Size:	67.2 KB
ID:	584242  

__________________
When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
  #5  
Old 02-17-2022, 11:57 AM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default

Good deal, thank you. I made a new restrictor and installed it yesterday. I did notice when I had it apart that the HLA's on the exhaust side of 3 and 5 were taller than the other 10. Ended up bleeding all of the HLA's and firing it back up. The bad news is that the miss is still there. You can hear a "puff" in the exhaust so I'm afraid that the hanging HLA's may have burned a couple of exhaust valves. By the way, the cam and followers showed no signs of extra wear or scoring. Luckily, there was a seller on Ebay that had two NOS GM valves # 9786805 so I've got those coming. What do I need to look for after tearing it apart to know if I need to take it to a machine shop or if I'm able to just lap in the new valves and call it a day.

  #6  
Old 02-17-2022, 03:33 PM
sprintbird sprintbird is offline
Senior Chief
 
Join Date: Feb 2002
Location: Anna, OH
Posts: 407
Default

What oil pressure are you seeing?

  #7  
Old 02-17-2022, 03:45 PM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default

It's 30-32 at cold idle, 32-34 at around 2500 while cruising and about 20-24 at warm idle.

  #8  
Old 02-17-2022, 06:30 PM
sprintbird sprintbird is offline
Senior Chief
 
Join Date: Feb 2002
Location: Anna, OH
Posts: 407
Default

That is within spec, so pressure is not the issue. Most likely the restrictor tube as you surmise. Let us know what you find out.

  #9  
Old 02-17-2022, 07:06 PM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default

I'm hoping that's what did the damage. Won't know until I tear it down for sure, but waiting on the new valves before I pull the head. I'll report back when I've got parts in-hand.

  #10  
Old 02-23-2022, 10:58 AM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default

I was able to do an air test last night and confirmed that the exhaust valves on #3 and #5 are leaking. Just waiting on parts before I tear it down to try and fix the issue.

  #11  
Old 03-24-2022, 02:44 PM
63 bomb's Avatar
63 bomb 63 bomb is offline
Senior Member
 
Join Date: Mar 2020
Posts: 125
Default

I finally got everything taken care of. It turned out to be a burned exhaust valve on #3 with #5 not far behind it. Ended up replacing both of those valves and re-lapping the other 4. She's now hitting on all six again and running like a top. I'm guessing that the larger hole in the restrictor tube was allowing too much oil to the lash adjusters and ended up holding those valves open a little bit causing them to get too hot and eventually burn up. Hopefully, the new restrictor that I made will fix this going forward.

  #12  
Old 03-25-2022, 06:33 AM
Jeff Hamlin's Avatar
Jeff Hamlin Jeff Hamlin is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: Beach side of Virginia
Posts: 9,371
Default


__________________
When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
  #13  
Old 04-25-2022, 04:56 PM
OHCAM67 OHCAM67 is offline
Junior Member
 
Join Date: Mar 2022
Location: Chapin, South Carolina 29036
Posts: 10
Default

Hi I have had a problem with exhaust smoke since I rebuilt my Sprint. The cylinder pressures are good and the smoke happens after the engine has been run a while. Could this be the restricter?

  #14  
Old 04-25-2022, 05:19 PM
Jeff Hamlin's Avatar
Jeff Hamlin Jeff Hamlin is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: Beach side of Virginia
Posts: 9,371
Default

No that sounds more likely to be a valve seal issue.
The restrictor only handles internal flow pressure.

Do you know what seals were used on your build?

__________________
When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
  #15  
Old 04-27-2022, 03:12 PM
sprintbird sprintbird is offline
Senior Chief
 
Join Date: Feb 2002
Location: Anna, OH
Posts: 407
Default

Either valve seals or rings have not seated yet.

  #16  
Old 04-29-2022, 02:51 PM
north's Avatar
north north is offline
Ultimate Warrior
 
Join Date: Oct 2006
Posts: 6,388
Default

Rings, smoke on load
seals, smoke on start up and deceleration

__________________
My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
  #17  
Old 12-31-2023, 09:15 AM
jayboyz28 jayboyz28 is offline
Junior Member
 
Join Date: Oct 2023
Location: Windsor, Ontario, Canada
Posts: 16
Default

Quote:
Originally Posted by 63 bomb View Post
Good deal, thank you. I made a new restrictor and installed it yesterday. I did notice when I had it apart that the HLA's on the exhaust side of 3 and 5 were taller than the other 10. Ended up bleeding all of the HLA's and firing it back up. The bad news is that the miss is still there. You can hear a "puff" in the exhaust so I'm afraid that the hanging HLA's may have burned a couple of exhaust valves. By the way, the cam and followers showed no signs of extra wear or scoring. Luckily, there was a seller on Ebay that had two NOS GM valves # 9786805 so I've got those coming. What do I need to look for after tearing it apart to know if I need to take it to a machine shop or if I'm able to just lap in the new valves and call it a day.
What dimensions did you make your oil tube to? Oil galley orifice .078* . Center of.tube .125"?

  #18  
Old 12-31-2023, 04:28 PM
sprintbird sprintbird is offline
Senior Chief
 
Join Date: Feb 2002
Location: Anna, OH
Posts: 407
Default

I sell new oil restrictor tubes.

The Following User Says Thank You to sprintbird For This Useful Post:
  #19  
Old 12-31-2023, 11:02 PM
jayboyz28 jayboyz28 is offline
Junior Member
 
Join Date: Oct 2023
Location: Windsor, Ontario, Canada
Posts: 16
Default

Quote:
Originally Posted by sprintbird View Post
I sell new oil restrictor tubes.
The problem is, I'm in Canada. Plus, the owner already had a new made up. So if you sell new ones, can you confirm the dimensions please?

Thank you

  #20  
Old 01-01-2024, 12:09 AM
sprintbird sprintbird is offline
Senior Chief
 
Join Date: Feb 2002
Location: Anna, OH
Posts: 407
Default

.078” & .160” are the dimensions of the ones I sell.

The Following User Says Thank You to sprintbird For This Useful Post:
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:35 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017