Engine Size: 855
Refrigerant Type: 134a
Country of Origin: United States
I am running a 1988 Volvo tractor and 53' flatbed with a Cummins 855. The OEM AC compressor is a Sanden style rotary aluminum pump. It works so so but I could definitely use higher performance and longevity from an AC compressor on this truck. Additionally when one idles for a period of time the aluminum compressor seems to drop in volume considerably.
I well remember the days of the cast iron Tecumseh compressor that seemed to last and yield a decent volume of cooling ability. I am strongly considering installing a new Tecumseh HG - 1000 for performance and durability.
What are some other thoughts on this matter. I would appreciate hearing.
Thank you so much,
Can you even get a new Tecumseh compressor? I know that they will directly swap with a York and Yorks were much more popular.
The early Yorks used brushes that rubbed on the rear of the clutch and they wore out quickly. If you do a swap get a newer style magnetic clutch.
If your having capacity issue I suggest staying with an modern compressor but bumping it up to something like a Seltec TM-16 or TM-21. TM-21 would require some mounting changes as they are all direct mount compressors. But with a flat York style plate that should be a pretty easy work around.
I see several issues in the original post.
First you mention performance. Do you mean capacity?
Second you mention longevity. How many miles do you get from the OEM compressor right now? Class 8 trucks rack up a lot of miles. What type of failures do you have? Is it the clutch, bearings, pistons - ?
Finally you mention a drop in cooling on long idle cycles. This could be many things. Poor low speed airflow, and reduced compressor capacity at idle would be the top two causes. I find on many class 8 trucks the accessory drives are way too conservative. With a govenor speed of 2800 or less, the pump should have a 2:1 overdrive from the crank, and possibly more. Without changing drives, a larger compressor like a TM21 would improve idle output. None of those compressors reach full output below 3,000 compressor rpm.
If you could provide us with the model number of your existing compressor, and some pressures we can probably help.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
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