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Understanding comp. description on ackits

mckpaul on Thu October 11, 2007 9:20 PM User is offlineView users profile

Year: 1984
Make: Chevy C-10
Model: Pickkup
Engine Size: 305
Refrigerant Type: R134a

On ackits for my vehicle they list two compressors. The descriptions are identical except for two words. The full description is.....

R-4 HEAVY METRIC THREADS DIRECT MT HIGH PRESSURE SWITCH PORT SHAFT - SHORT OR LONG 1 GR DIA 4.9 MTD .625 COIL SPADE @ 12:00

To break it down:
R4 - Ok, we know R4 is the kind of compressor it is.
HEAVY - I assume this means the big, thicker standard heavy clutch, not the thinner Light clutch GM came out with?
METRIC THREADS - I assume this is the mounting holes, I know mine uses metric bolts
DIRECT MT HIGH PRESSURE - I assume this means there's a plugged hole where a high pressure switch would go?

OK not sure if I'm separating things in the right place here, but..

SWITCH PORT - (other compressor listing said ORING PORTS instead, that being the only difference in description) I've seen this referred to as 'switch type' and 'non-switch type'. Is this different than direct mount high pressure? I assume my old existing compressor has ORING PORTS since it has no switches on it? I assume if you originally have a switch type you have to have a switch type replacement, but if you don't have a switch, will the either type work? (maybe can use a switch type and just not use the switch?)

SHAFT - SHORT OR LONG 1 GR 4.9 MTD - Don't know what these mean

.625 COIL SPADE @ 12:00 - My spade connections on the coil are at 12:00 o'clock, and the are about .625" outside to outside, I assume that's what that means right?

Could you confirm and fill in the blanks please?
Thanks...again.


Edited: Thu October 11, 2007 at 9:20 PM by mckpaul

Chick on Thu October 11, 2007 9:38 PM User is offlineView users profile

First, O ring ports is where the manifold bolts up..(your original uses O rings) Newer R4's used sealing washers, and they do interchange on many models using thicker sealing washers etc.. 12 O'clock is where the clutch coil plug is, in relation to the manifold in the rear, since R4's can be mounted on the side of an engine such as Mercedes.. Actually there is a little to much info for the average buyer, light is aluminum case, heavy is the steel case such as your original.. Clutch difference means nothing for your application, but they did make two shaft models, long and short..They use the same bearing, but clutches are different. You will get ojne with the high pressure switch plugged as opposed to no switch hole.. Here's the one you need for the 305

R4 for 5.0 engine

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Thu October 11, 2007 9:43 PM User is offlineView users profile

PS: You will probably get one with the newer stlye clutch, unlike the old style shown in the pic, but I am not sure..It will be the "single grove pulley" though and will work on your application.. The difference between the short shaft and long shaft means mainly (for you) that clutchs won't interchange between the two compressors..(long and short shaft) but either one you get will have the "groove" in the right place..As I remember it, it's about "one inch" from the body of the compressor to the center of the pulley groove..??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mckpaul on Thu October 11, 2007 10:26 PM User is offlineView users profile

Thanks for the response Chick.

Yes, being an 84 it has the single groove pulley, and it is 1" from the frame of the compressor to the center of the pulley.

What threw me off a little is that when I pull up the page based on my vehicle year, etc, what is listed as a new compressor is described as SWITCH PORT, and the other one listed on the same page further down is described as ORING PORT, which is listed as remanufactured. I understand my manifold is the ORING type, and of course there are orings in the grooves on the back of the old compressor where the manifold bolts up, so I wasn't sure if I could get a new compressor with ORING PORTS. Are you saying I may have to get a switch port model to get a new one and adapt it to my manifold with different sealing washers?

Chick on Thu October 11, 2007 10:33 PM User is offlineView users profile

That depends on wether or not it is a flat sealing washer compressor or not..If it is, it will come with the new sealing washers to work on your manifold, so no matter what, it will work..I really can't say which one you'll get, but I can say I've seen a lot of R4's in different configurations, but I "believe" the one AcKits has will be O ring with a switch port.. You come accross the sealing washers more with "reman units", as it's easier to use sealing washers on an O ring system, than the other way around... Order the one for your truck, and it will work just fine....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mckpaul on Thu October 11, 2007 10:37 PM User is offlineView users profile

Cool. That clears things up. Thanks for taking the time to expalin!

Paul

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