OT-F350 7.3L powerstroke - Butch(OH)
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=15583
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Topic: OT-F350 7.3L powerstroke - Butch(OH)
Posted By: Eric[IL]
Subject: OT-F350 7.3L powerstroke - Butch(OH)
Date Posted: 22 Jul 2010 at 11:47pm
| Butch, thanks for the advice on bleeding the high pressure oil pump system after changing injectors on my F350 7.3L powerstroke. I hooked the trailer on it today and it began to smoke light blue like crazy, especially at 2500-3000 rpms. After about 5-10 miles it cleared right up. Now, it also starts quicker than before. I was wondering if you have any advice for it's Air conditioning. Air fan only blows out defrost vents. Mechanic tried adding freon, but it didn't take much if any. We tried replacing the climate control switch in the dash, but that didn't help things. We have notice that the compressor clutch is not engaging when AC is selected. Is there some relay or other switches that call for the compressor clutch to engage that could be bad? This is the first trouble I have experienced with this truck's AC. It has blown cold all it's life. I have used a diesel truck website to ask questions like this in the past, but I can't remember which site I visited for my ford. Can you or others point me in the right direction? Thanks. Very humid & hot in Illinois today!!! |
Replies:
Posted By: Eric[IL]
Date Posted: 23 Jul 2010 at 2:48am
I did a search and found http://www.powerstroke.org - www.powerstroke.org forum. I did a post about the AC acting up over there. After I posted my thread, I read their earlier posts about this subject. Many others have had same problems. Having the info fresh in my mind, I went to work fixing it. Yeah - 1 am and I'm outside working on my truck with a flashlight. Found my electric vacuum pump was unplugged. Plugged it in and that took care of the defrost vent only thing. Next, I pulled the compressor electric clutch shim out since it was over 0.050 clearance. This put the clearance around 0.025, so it was good to go. The compressor clutch still did not engage, so I started moving some wiring around near the cold tubing electrical switch?? located on the outlet side of the compressor. The wires had some sort of a short circuit in them. I found that taping them closely to the switch connected the circuit. Low and behold, the compressor came on and is working normal. AC is now blowing cold again and everything is functional. Much like this Allis site, I am appreciable to the fine folks at that site for their earlier posted information!! It was extremely helpful. I am looking forward to a cooler day tomorrow in my truck. 
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Posted By: Butch(OH)
Date Posted: 23 Jul 2010 at 5:44am
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Glad to have helped. A person need to be carefull where he reads and what he believes when it comes to turbo diesel truck forums, a lot of them are dominated by whipper snappers who are,, uh,,to say the least, unknowledgeble ( I am being polite this morning)
Here is the site I use
http://www.ford-trucks.com/forums/index.php - www.ford-trucks.com/forums/index.php
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Posted By: Larry(OH)
Date Posted: 23 Jul 2010 at 5:58am
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Here is the site I get alot of info from for repairs. I have always had good luck with helpful people here and saved myself alot of money by doing it myself.
Just like everywhere, there are alot of know it all's that can plug and play, but other than that, forget it
http://www.thedieselstop.com/ - http://www.thedieselstop.com/ ------------- '40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie *ALLIS EXPRESS contact* I can explain it to you, BUT I cannot understand it for you!! |
Posted By: Brian Jasper co. Ia
Date Posted: 23 Jul 2010 at 12:19pm
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I agree whole heartedly with Butch. Early powerstrokes used an engine driven vacuum pump and a vacuum booster for the brakes. I don't know right off when they switched, but going to Hydro Boost was a good idea. All vacuum operated HVAC systems are mandated by the feds that in the event of the loss of vacuum, they default to defrost. A couple things that prevent the HVAC from switching are leaking vacuum operated hub seals, or the vacuum hose for the water control valve being disconnected if it has one. ------------- "Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford |
Posted By: Steve M C/IL
Date Posted: 23 Jul 2010 at 1:13pm
| Wow Brain!! I "feel" so much SAFER knowing that Big Brother is mandating my defroster will work if the system goes down.Obviously I couldn't manage without their help. |