#81  
Old 08-19-2022, 12:46 AM
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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.

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  #82  
Old 08-19-2022, 12:52 AM
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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:



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Last edited by Scarebird; 08-19-2022 at 01:07 AM.
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  #83  
Old 08-20-2022, 07:57 AM
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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
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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.


  #85  
Old 09-18-2022, 07:26 PM
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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.
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Last edited by Scarebird; 09-18-2022 at 08:01 PM.
  #86  
Old 09-24-2022, 12:18 AM
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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.

  #87  
Old 09-24-2022, 06:47 AM
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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
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nope, I missed it. IIRC only the 3/4 ton and up get them...

  #89  
Old 09-26-2022, 09:09 AM
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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
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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.

  #91  
Old 09-26-2022, 03:01 PM
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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
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Interesting side note. My 1996 Caprice had an LT1 with an offset belt driven fan and an electric secondary fan.

  #93  
Old 10-05-2022, 01:14 AM
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My 98 Z28 has purely electric fan

I clipped the tips a bit to clear the fan after I mounted the radiator and shroud. I ginned up this little widget out of tin
so all the cuts would be the same. I used a pair of bull snips and finished it off with a file and sandpaper.



The 90 degree inlet was trimmed back a 1/2" also and mounted. Clears the fan now by 3/8"



  #94  
Old 10-05-2022, 05:31 AM
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Nice work!

  #95  
Old 10-07-2022, 12:29 AM
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Gracias.

As noted before I am running the OEM steam gauges currently, so need to have senders. I used the block heater port for temp, and Swap Time sent a nice billet piece from ICT for the oil pressure. It has an O-ring instead of a gasket along with 3 ports and a pair of 1/8" pipe plugs.

I also fabbed a heat shield. My first car was a 69 Cutlass S, they were notorious hot starters due to solenoid heat soak so everything gets shielded here!


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  #96  
Old 10-13-2022, 10:03 AM
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Proposed separator
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  #97  
Old 11-04-2022, 11:55 PM
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I think that this can should work fine.



It is all billet aluminum with a bunch of fittings. It has a small chamber inside that looks like it should have some mesh or steel wool for the oil droplets to coagulate and drop to the bottom.



A simple bracket was fabbed up - mounts snugly against the alternator bracket as shown.



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  #98  
Old 11-05-2022, 01:42 AM
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Nice work.

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  #99  
Old 11-05-2022, 05:52 AM
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I must have missed it, but do LS engines have a separator for case venting? Or is there a problem with the OE setup?

That's a pretty sweet separator by the way. Who makes those?

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  #100  
Old 11-05-2022, 10:10 AM
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Thanks.

LS motors do not require them as they are port injected. LT motors are direct injection so have no fuel wash on the intake valves, supercharged motors have this issue worse and so have factory separators. The OEM units won't fit on the 5.3 due to the water pump design.

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