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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 11-24-2008
rtpn60's Avatar
rtpn60 rtpn60 is offline
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Default 78 vs 82 FC questions

If you look at my pic I have several questions;

http://autos.ph.groups.yahoo.com/group/FC_Wanderlodge/photos/browse/80b5

1) Is this plumbing for the heater take offs stock? Wouldn't brass be
better here? I'm worried I won't be able to work on these due to the
corrosion.

2) Anyone know the difference in the tach sending units between a 78 &
82?

3) The 82 has a 6-bladed fan with no clutch and the 78 has a 5-bladed
fan with a clutch. Which is better?

Thanx, Trying to improve a few things
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  #2  
Old 11-24-2008
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tach is in the ft of the engine..senders should be the same to match the tach in the dash


6 blade with clutch is the deal
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  #3  
Old 11-24-2008
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Quote:
Originally Posted by rtpn60 View Post
If you look at my pic I have several questions;

http://autos.ph.groups.yahoo.com/group/FC_Wanderlodge/photos/browse/80b5

1) Is this plumbing for the heater take offs stock? Wouldn't brass be
better here? I'm worried I won't be able to work on these due to the
corrosion.

2) Anyone know the difference in the tach sending units between a 78 &
82?

3) The 82 has a 6-bladed fan with no clutch and the 78 has a 5-bladed
fan with a clutch. Which is better?

Thanx, Trying to improve a few things

Mike,

The plumbing for the water heaters on the front of the engine, is how they came from BB, I don't know anything about changing them to brass.

If you are thinking of changing fans, be sure to also measure the diameter, to make sure that any fan change will also fit inside of the radiator fan shroud, if you have one. I had to make one to fit around my Horton air clutch fan, on my '82 FC, the photo below is without the shroud installed. I also installed a fan override switch, that allows me to start operating the fan when I see a long grade coming up, to help cool the engine better, rather than waiting on the thermoswitch to activate the fan. If you use a fan without a clutch be ready for more engine noise.


http://www.pbase.com/iamflagman/image/42350336

Here is a better view of the Horton air clutch mechanism for the fan and the tach drive on my '82.

http://www.pbase.com/iamflagman/image/84726346
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  #4  
Old 11-24-2008
mynavion mynavion is offline
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[quote=iamflagman;10132]Mike,

The plumbing for the water heaters on the front of the engine, is how they came from BB, I don't know anything about changing them to brass.

Do not use brass!


If you are thinking of changing fans, be sure to also measure the diameter, to make sure that any fan change will also fit inside of the radiator fan shroud, if you have one. I had to make one to fit around my Horton air clutch fan, on my '82 FC, the photo below is without the shroud installed. I also installed a fan override switch, that allows me to start operating the fan when I see a long grade coming up, to help cool the engine better, rather than waiting on the thermoswitch to activate the fan. If you use a fan without a clutch be ready for more engine noise.

Two things here. The set-up that John mentions with the Horton fan and override switch is the best method in my opinion. As far as using a fan without a clutch. Besides the noise, on the old 3208NA its like driving a boat with the anchor out. You only want that fan on when it is needed. The poor old 'bird needs all the power it can get so why handicap it with a fan thats probably robbing 20 or 30 horsepower.

John
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  #5  
Old 11-24-2008
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More info on the tach - Gauge on dash is showing 16.5 volts constant. I'm hoping a regulator swap will fix the issue but am wondering if this could be a sign that a diode may be bad in the alternator? I found this in the 78 bus; Motorola 8RH2012 but after looking it up the application guide says it is for an AMC/Jeep product? My 82 bus is using an 8RH2024 but was unable to find specs on that one.

Since I do have the 82 as a parts bus I can "upgrade" any items that may be compatible. The Alternators are different, the 82 has a Motorola alternator but haven't pulled the number of it yet nor have I located them on the 78.
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  #6  
Old 11-24-2008
Stephen Stephen is offline
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the motorola is out of production and itis extremely hard to find a regulator they bolt on the back of the motorola
I did find a couple they are at
CHicago Magneto But that was a while ago
they were expensive
I changed to a leece- Neville
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  #7  
Old 11-24-2008
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Thanx John, looking at your pics I noticed the tach sending unit is only using one wire? Mine is a different looking unit with only one wire but the 82 I'm comparing to looks just like yours but with two wires. The black appears to be the ground but not sure if I should ground it or run it all the way back to the dash?

Also, on yours I'm seeing the coolant line to the compressor is a rubber hose. Mine is hard plumbed with a steel tubing all the way. Do you know if yours is stock or was it changed to rubber? Finding 1/2" inverted flare nuts is hard especially when all the brake fittings stop at 3/8".
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78FC35SB Wanderlodge - "Putz'n Around"
'90 GL1500 Goldwing | '67 VW Rail | '82 CJ5 Jeep
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  #8  
Old 11-24-2008
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Thanx for the feed back John(s). I was thinking of using the 6 blade to get more cooling power and removing the clutches for simplicity and longevity. Remember I'm in Arizona so most times I'm traveling it's over 110 degrees. The loss of HP is an acceptable loss considering the alternatives. I will look into moving the Horton clutch over to the 78 as that does seem the best of both worlds though. Is it simply a pnuematic switch on the dash or are they electric?
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78FC35SB Wanderlodge - "Putz'n Around"
'90 GL1500 Goldwing | '67 VW Rail | '82 CJ5 Jeep
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  #9  
Old 11-24-2008
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Quote:
Originally Posted by rtpn60 View Post
Thanx for the feed back John(s). I was thinking of using the 6 blade to get more cooling power and removing the clutches for simplicity and longevity. Remember I'm in Arizona so most times I'm traveling it's over 110 degrees. The loss of HP is an acceptable loss considering the alternatives. I will look into moving the Horton clutch over to the 78 as that does seem the best of both worlds though. Is it simply a pnuematic switch on the dash or are they electric?

Thanx John, looking at your pics I noticed the tach sending unit is only using one wire? Mine is a different looking unit with only one wire but the 82 I'm comparing to looks just like yours but with two wires. The black appears to be the ground but not sure if I should ground it or run it all the way back to the dash?

Also, on yours I'm seeing the coolant line to the compressor is a rubber hose. Mine is hard plumbed with a steel tubing all the way. Do you know if yours is stock or was it changed to rubber? Finding 1/2" inverted flare nuts is hard especially when all the brake fittings stop at 3/8".

The Horton fan is activated through a themoswitch and a pneumatic switch, the electric override switch is tied into the themoswitch wiring.

There are actually two wires on the tach sending unit, in the photo the black wire looks like a shadow of the white wire.

As long as you get the proper themoswitch installed, under normal driving conditions it will handle any temperature, the override just comes in handy when you are about to start up a long grade to get a head start on the cooling. mine handles 110 degrees last summer in Wyoming and Montana pulling my enclosed trailer at 62 feet overall and 44,000 pounds gross. You may want to have the radiator cleaned thoroughly. I have found like many others, that at times you may need to slow down and/or select a lower gear to aid in engine cooling.

As far as I know the coolant line on the compressor is stock, I haven't changed it myself.
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I'm NO EXPERT, but I did stay in the FINN'S INN EXPRESS last night
HOPKINS, SOUTH CAROLINA
VISIT THE FINN'S INN EXPRESS REMODELING ADVENTURE AND TECH. TIPS
I'M SO SLOW ON THE HILLS,THAT I GET TO SMELL THE FLOWERS AS I GO BY.....AND WATCH THEM GROW TOO!! NOT SO MUCH ANYMORE
Visit the WILD HARE RACING website
REMEMBER 9/11
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  #10  
Old 11-24-2008
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Default Coolant Line on our 1989 FC (pic)

Our 1989FC also has galvanized house type piping for the heater.

http://groups.yahoo.com/group/wander...tart=1&dir=asc

May have to cut and past above line into your browser to view.
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