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Corona bench tear down, autopsy of,a 1999 9171703 AC compressor

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Corona bench tear down, autopsy of,a 1999 9171703 AC compressor

Post by abscate » Tue Apr 28, 2020 10:05 am

Musings

After removal of the clutch and magnet, 6 m8 (12 mm head) bolts hold the four pieces together

Front cap

Body half one

Body half two

Rear cap

Two reed valve assemblies live in each cap end

Bakelite pistons ride in the cylinders in each body half, they have semi spherical metal bearing on top and bottom

They are driven by the eccentric cam in the middle with axial float of the cam controlled by needle bearing, and radial by a rear bearing on the rear plate and a bushing/seal in the front plate

Needed refurb parts...110 x2 mm oring for the caps and body

Front bushing, that will be a pain to find I bet
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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by abscate » Tue Apr 28, 2020 10:05 am

Picture dump
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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by amblerman » Tue Apr 28, 2020 11:07 am

Was your goal to just tear down and see what's what? or are you rebuilding it?

Also, threads like this always amaze me in this level of photography for something like a repair forum would have been near impossible 5-8 years ago. The level of cameras in phones is just remarkable.

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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by erikv11 » Tue Apr 28, 2020 11:17 am

Sigh. I have so much less time for the car in these corona times. Looks good though!
'95 854 T5-R, Motronic 4.4, 185k
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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by abscate » Tue Apr 28, 2020 11:20 am

THis one was dead so I knocked it down

It looks tough to source parts although I did find the front seal at Volvo web store


9171344 $47

Someone sourced the clutch bearing orettty cheap too, will find
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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by scot850 » Tue Apr 28, 2020 3:33 pm

Why do you need 110 x 2mm 'O' rings?

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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by abscate » Tue Apr 28, 2020 5:07 pm

Big o-rings go between each body section and the two end plates seal it up.

These things are things of beauty inside. I can’t believe be how cheap they are, looking at the precision machining.
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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by volvolugnut » Tue Apr 28, 2020 6:11 pm

This type of design is often used on high pressure hydraulic pumps. It is called a swash plate design (the eccentric cam part in the middle). The hydraulic pumps are extremely close tolerances and do not tolerate any dirt. I have never seen one with front and back pistons.

How are the balls installed and removed? On hydraulic pumps, a foot with spherical bearing is held by pressure against the swash plate. They have no suction capability.

If the bushing is bronze, it should be easy to have some made. I think the O-rings could also be sourced. Someone could start a cottage industry rebuilding these. Hydraulic pumps are rebuilt for about 1/3 cost of new.

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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by abscate » Tue Apr 28, 2020 6:32 pm

Found the reason this was a growler

The swash plate ( thanks Volvolugnut) has damage
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1DF58AF5-F5F7-458E-AE64-69BA4C58E1B8.jpeg
E1F14363-65F3-419B-A1F7-3FD5492AF12D.jpeg
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Re: Corona bench tear down of,a 1999 9171703 AC comppressor

Post by 850oldschool » Tue Apr 28, 2020 6:52 pm

I've always wanted to do this, the main deterrent was the time it would take to go down the rabbit hole to source the internal parts. The inside is every bit as beautiful as I had imagined.

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