#81  
Old 08-19-2022, 12:46 AM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

The engine harness has a plug that connects to a sub-harness which runs off under the dash mating with such things as the OBD II port and pedal rheostat assembly.

Needless to say we don't want such things just flopping about so this wee clip was fashioned. It slips in the plug and then screws into the intake assembly securing it Bristol fashion.





It is the details that take so damn long to do here.

Attached Thumbnails
Click image for larger version

Name:	Clip.jpg
Views:	187
Size:	39.5 KB
ID:	596750   Click image for larger version

Name:	Clip attached.jpg
Views:	189
Size:	61.9 KB
ID:	596751  

__________________
www.scarebird.com
  #82  
Old 08-19-2022, 12:52 AM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

PS pump revisited. I spent a few hours and money designing a nice mount for the 1998-02 F body pump and now see this little bugger exists. Seems some of GM's 3/4 and 1 ton truck may still use hydraulic steering and require pumps.

Dammit, just $26 too. GM #12654286 mounted on unknown engine with same water pump.



My 2nd design lowered for better clearance of upper radiator hose:



Attached Thumbnails
Click image for larger version

Name:	GM PS bracket.jpg
Views:	182
Size:	70.4 KB
ID:	596752   Click image for larger version

Name:	Scarebird PS.jpg
Views:	185
Size:	63.2 KB
ID:	596753  

__________________
www.scarebird.com

Last edited by Scarebird; 08-19-2022 at 01:07 AM.
The Following 2 Users Say Thank You to Scarebird For This Useful Post:
  #83  
Old 08-20-2022, 07:57 AM
greaseball greaseball is offline
Junior Member
 
Join Date: Jul 2009
Posts: 13
Default

Looking great!

I've not had time over the past month or so to work on my L87-turned-to Lt2 either. You're right, there isn't much info available on the 2020 and newer engines.

Great idea on the wiring retainer at the oil pan. I'll hit you up for the drawing. Getting wiring to look planned and organized can be tough but well worth the effort.

  #84  
Old 08-20-2022, 11:22 PM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

I am trying to decide how to integrate the OEM type wiring and the engine wiring to reduce clutter.

Choice is either move steam gauge wires and others to the lighting harness then to the engine fuse box or connect at the rear of the engine.


__________________
www.scarebird.com
  #85  
Old 09-18-2022, 07:26 PM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

Dropped the engine in hopefully for the final time. Exhaust manifolds do not allow the use of mechanical linkage so hydraulic throwout it is.

Not really a difficult thing to do, just have to check a few measurements. First off is the clutch depth from the bellhousing face.



Secondly is the throw out bearing to the trans face. The different minus 0.060" is the amount of shims you will need for proper disengagement, in this case 0.500. The shims are usually provide by the supplier - in this case Howe Racing. They are affordable and quality units.



Hydraulic bearings have 2 fittings; one for pressure, the second to bleed the system.



As you see routing the bleed line thru the arm hole will create a huge bubble trap, not allowing proper bleeding. So a hole was drilled between the ribs of the bell housing for the hose to exit the bearing.

This will work except the 18" hose is too short for easy access (it barely peeks above the engine).



A 28" hose is on order.
Attached Thumbnails
Click image for larger version

Name:	Checking clutch depth.jpg
Views:	98
Size:	47.2 KB
ID:	598973   Click image for larger version

Name:	Checking throwout depth.jpg
Views:	98
Size:	53.6 KB
ID:	598974   Click image for larger version

Name:	Fixed routing.jpg
Views:	131
Size:	83.5 KB
ID:	598975   Click image for larger version

Name:	Initail routing.jpg
Views:	97
Size:	95.9 KB
ID:	598976  

__________________
www.scarebird.com

Last edited by Scarebird; 09-18-2022 at 08:01 PM.
  #86  
Old 09-24-2022, 12:18 AM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

In my 1971 LeMans L84 conversion, the norm is to run an aluminum radiator with a pair of electric cooling fans. Bollocks.

I find the old school thermostatic clutch fan dead reliable and very simple, looks period correct and confuses "experts". Note to mention it is one less thing to go gunnybags!
I noted on my 2020 5.3 crate motor that the water pump had a threaded section - this intrigued me.
Measurements show it to be a M30-1.5 thread. Why? it served no purpose in installation and as far as I can see no use in rebuilding the pump. By dumb luck I noted in a youtube video that a Ford Ranger had the same thing. The water pump seemed suspiciously centered in the radiator shroud too... this is the pump: GM 12687631

no way the thread and pitch are the same...







Way. I ordered a HD blade section and clutch - it fit perfectly.

I will need to notch the fan blades a bit and shorten the air intake elbow but this is easily doable. Part application is 1990-2011 Ranger 4.0 w/ HD cooling.

__________________
www.scarebird.com
  #87  
Old 09-24-2022, 06:47 AM
JSchmitz's Avatar
JSchmitz JSchmitz is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: Union, MO
Posts: 1,856
Default

I don't understand why you're surprised about being able to run a clutch fan. The GM trucks have them. Or am I missing something?

  #88  
Old 09-24-2022, 12:23 PM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

nope, I missed it. IIRC only the 3/4 ton and up get them...

__________________
www.scarebird.com
  #89  
Old 09-26-2022, 09:09 AM
greaseball greaseball is offline
Junior Member
 
Join Date: Jul 2009
Posts: 13
Default

Quote:
Originally Posted by Scarebird View Post
nope, I missed it. IIRC only the 3/4 ton and up get them...
That's correct. The truck models with the new 6.6L L8T engine get a hydraulic clutch fan. This would include the Silverado 2500HD pick up trucks.

HOWEVER! The thread size on the L84/L87 water pump pulleys are smaller than the L8T truck engines. If found a YouTube video that shows the differences: http://www.youtube.com/watch?v=yl5r8Z5tPZw


I'm also thinking about running a hydraulic clutch cooling fan. Looks like I'd have to change out my L87 water pump, though. Or run the Ford parts that Scarebird listed

Here's a list of the GM parts for the 6.6L L8T truck engine.

Fan: 25919018
Clutch: 84382012
Fan to clutch adapter: 20979011
Water pump: 12707680

  #90  
Old 09-26-2022, 02:44 PM
Scarebird's Avatar
Scarebird Scarebird is offline
Ultimate Warrior
 
Join Date: Nov 2002
Location: ABQ, USA
Posts: 4,448
Default

Interesting video - looks like the only difference was the mounting hub and maybe internal impeller size.

As far as I can tell there is not a better overall fit than the Ranger stuff - same size as my OEM fan and fits halfway in the shroud.

__________________
www.scarebird.com
  #91  
Old 09-26-2022, 03:01 PM
JSchmitz's Avatar
JSchmitz JSchmitz is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: Union, MO
Posts: 1,856
Default

Quote:
Originally Posted by Scarebird View Post
nope, I missed it. IIRC only the 3/4 ton and up get them...
My '04 3/4 ton GMC has a clutch fan. The 5.3, that I put in my GTO, had one. The PCM program says 2000 1/2 ton Chevy. Not sure though.

  #92  
Old 09-26-2022, 03:02 PM
JSchmitz's Avatar
JSchmitz JSchmitz is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: Union, MO
Posts: 1,856
Default

Interesting side note. My 1996 Caprice had an LT1 with an offset belt driven fan and an electric secondary fan.

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 06:53 PM.

 

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