AC upgrades/improvements - Page 5 - PeachParts Mercedes-Benz Forum

dannym · #61 06-20-2005, 03:42 PM

Hey,
can someone post the torque for the manifold to compressor bolt?

Thanks

leathermang · #62 06-20-2005, 03:57 PM

Designation --- Delco Frigidare Radial 4 cylinder
MB FSM AC manual page 83.6-524/9 F 3
max speed 1/min 7000
required input at max compressor speed kW (hp) approx 6.3 (8.5)
volume of cylinders 164 cc
oil filling capacity in new refrigerant compressor 170 cc
tightening torques;
screws (8) belt pulley clutch Nm 11, kpm 1.1
screw M 10x30 pipline to refrigerant compressor Nm 50 plus or minus 3,Kpm 5 plus or minus 3
screws (5 and 6) M12 refrigerant compressor to carrier Nm 60 plus 10,kpm 6+1
hose line (14) from evaporator to pipeline 7/8 inch Nm29-37,kpm2.9-3.7
Hose line(15) from pipeline to condenser 3/4 inch Nm24-28,kpm 2.4-2.8

dannym · #63 06-20-2005, 04:05 PM

Easy for you to say!

I pick door #2:
screw M 10x30 pipline to refrigerant compressor Nm 50 plus or minus 3,Kpm 5 plus or minus 3

can you cut and paste a diagram too?

Danny

leathermang · #64 06-20-2005, 04:15 PM

That is not that easy... I don't see either a diagram or pictures which correlate to the numbers....

dannym · #65 06-20-2005, 04:22 PM

Well, thanks for that info. It's good to know.

I bet Skinnerbox would have it. Freekin idiots, now you know why communism doesn't work.

Danny

crazy banana · #66 06-21-2005, 10:41 PM

[QUOTE=dmorrison]I will add to this post to keep the info going.

In my 1982 300TD, I replaced everything on the AC system. All new parts and a parallel flow condenser.
The post about the conversion.

The compressor just seized after 1.5 years of running, not happy with that. Another post shows this and I have not opened the system yet (6/19/05)to determine a cause.
me

is it possible that the synthetic oil that is made for both R12 and R134 not living up to its expectation??

James L · #67 06-22-2005, 09:27 AM

I have been thinking lately that maybe the reason for the failed R4 compressors that were under R134A conversions is the higher head pressures
of R134A. Maybe the compressor reed vanes and seals can not hold up to the
pressures that they were not designded for, and over a year or two they fail. The R4 was designed for R12.

Opnions?

#68 06-22-2005, 09:45 AM

High failure rate of compressors in converted systems is due to a combination of higher head pressures and less than ideal lubrication. There are all different combinations of different oils in these systems. Some of them that are flushed and get the correct amount of ester will have good lubrication. The haphazardly converted systems will have less than ideal lubrication.

A respected poster on this board posted a few years ago that he had done over 200 "proper" conversions and kept good records. The average life of the systems after conversions was only a couple of years.

With R12 prices coming down and 134 prices going up, converting is now false economy IMHO.

Have a great day,

leathermang · #69 06-22-2005, 11:54 AM

"With R12 prices coming down and 134 prices going up, converting is now false economy IMHO."--Larry Bible

For anyone that lives south of the Mason Dixon line... and desires to be Comfortably COLD ... it was already that...

leathermang · #70 06-10-2006, 05:20 PM

A lot of good info in this thread also.... A lot of AC questions happening now with few indications the search feature is being used...

crazy banana · #71 06-11-2006, 10:58 AM

i am useing R12 with the synthetic oil that's designed for R12 and R134 system. my A/C compressor is making a Knocking sound now. it goes away when i turn off the A/C. it still work but it makes these awful knocking noise. I tighten the bolts and the belts. the sound continueds. anyone on have any ideas?

leathermang · #72 06-11-2006, 11:18 AM

Crazy Banana, please check your private messages.. Greg