New compressor hard to turn by hand

Friendly format provided to inquire about automotive a/c systems.
Archived Forum

Moderators: bohica2xo, Tim, JohnHere, Dougflas, HECAT

brielly
Posts: 18
Joined: Tue Aug 11, 2020 11:26 am

New compressor hard to turn by hand

Postby brielly » Fri Aug 28, 2020 1:13 pm

As the title states. I just got a new compressor for my 2001 cherokee but it's pretty much impossible to turn by hand. it does turn smoothly with a socket. My old one easily turns by hand. Is this normal or should I send this one back? Thanks in advance.
Al9
Posts: 207
Joined: Tue Mar 10, 2020 3:26 am
Location: Southern Europe

Re: New compressor hard to turn by hand

Postby Al9 » Sat Aug 29, 2020 2:49 am

Have you loaded it with the proper amount and type of oil through the drain hole prior to rotating it? Did it already come with the proper amount of oil inside (better drain and check everytime)?

Keep in mind that SP-10 is PAG 46, SP-20 is PAG 100 and SP-15 is apparently PAG 68 (not so widespread in the USA, but Masterchem sells it if you can't find OEM SP-15).
brielly
Posts: 18
Joined: Tue Aug 11, 2020 11:26 am

Re: New compressor hard to turn by hand

Postby brielly » Sat Aug 29, 2020 3:57 am

Yes, I verified that it had 3 oz of pag 100 in it.
User avatar
Tim
Site Admin
Posts: 482
Joined: Tue Apr 12, 2016 2:19 pm
Location: Scottsdale, Arizona
Contact:

Re: New compressor hard to turn by hand

Postby Tim » Sat Aug 29, 2020 10:09 am

What if I say no it's not good?

What if I say it is Normal?

Is it new or rebuilt?

I would contact the supplier. Using the information on the web without discussing it with the supplier. It only causes headaches trying to explain why what was read is not always true.

In general, one would want a fairly tight compressor. Easy to turn compressor, usually means it will not pump well. As piston rings are not sealing well. Different model compressors have more or less resistance based on design.

I would not be overly concerned. But would contact the source and ask them.
------------------------------
Please support ACKITS.com for your Auto A/C Parts and Tool needs.
P:602-233-0090
User avatar
Cusser
Posts: 574
Joined: Sun Apr 24, 2016 6:29 am

Re: New compressor hard to turn by hand

Postby Cusser » Sat Aug 29, 2020 10:25 am

Next time buy from Tim at Arizona Mobile Air !!!

I've bought at least three compressors and an evaporator from Arizona Mobile Air for various vehicles over the past 2.5 decades. And I bought a vacuum pump from them for my work laboratory.
User avatar
Tim
Site Admin
Posts: 482
Joined: Tue Apr 12, 2016 2:19 pm
Location: Scottsdale, Arizona
Contact:

Re: New compressor hard to turn by hand

Postby Tim » Sat Aug 29, 2020 11:53 am

Cusser wrote:Next time buy from Tim at Arizona Mobile Air !!!
.


While I agree, LOL.

With concerns like this. It's always the best "IMO" to ask your supplier. They know what was sold and if there have been any issues.

I see these types of questions a lot, here, phone or in emails.

What I'm trying to convey. Is if I say the compressor is bad. Because I had issues with a tight compressor. Which I personally bought off eBay or discount house. It could reflect in my response.

Have no issues with the question. But it's important to rely on your vendor
------------------------------
Please support ACKITS.com for your Auto A/C Parts and Tool needs.
P:602-233-0090
Al9
Posts: 207
Joined: Tue Mar 10, 2020 3:26 am
Location: Southern Europe

Re: New compressor hard to turn by hand

Postby Al9 » Sat Aug 29, 2020 12:41 pm

I'd just changed compressor and while i haven't turned it by hand, i'd say that the new one feels definitely harder on the engine than the old one was (this one definitely had some serious wear). Can feel the RPM dipping down as soon as it gets into full stroke (mine is variable displacement). Oil and refrigerant levels are proper, the condenser is a new unit and all factory air dams are in place.

My own opinion? Since it's a fixed displacement pump and it's brand new, it's normal. Over time, internal clearances loosen up due to normal wear & tear. Even if you keep the system in top shape. That's why the old one turns so easily by hand.

Return to “Automotive Air Conditioning Forum”