| Author | Message | ||
| Iver (Mciv)
Registered Member Username: Mciv Post Number: 21 Registered: 11-2006 Posted From: 70.69.131.252 Rating: N/A |
Does anyone know the size of the standard and large squirrel cage fans in a MC9? "The Book" says 10 1/2" diameter. Mine are 11 3/4". Are there any larger ones? Thanks Iv. | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 643 Registered: 3-2007 Posted From: 71.53.155.14  Rating: N/A |
Mciv; I don't know what the normal size is however are you having heating problems? The size of the cage I think is ok,now if you are having a problem you can get a pulley from several sources to increase the speed of the fan and therfore will help cool the engine better. I found Grainger, Miller bearings will help you on this matter. They also have a kit with all the parts to do the job,I don't know where it is but look on the archives and it will be there. Good Luck Gomer | ||
| Iver (Mciv)
Registered Member Username: Mciv Post Number: 22 Registered: 11-2006 Posted From: 70.69.131.252 Rating: N/A |
When normal driving it doesn't overheat. Only on long hill climbs. I think I will look into getting a smaller pulley as you and others have suggested. It has also been suggested that I get the large 102 blower fans. I don't know if the ones I have now are the large ones or not. Thanks Iv. | ||
| Rob Norgren (Robsedona)
Registered Member Username: Robsedona Post Number: 165 Registered: 11-2007 Posted From: 75.208.25.87  Rating: N/A |
Bigger Fans also take a bigger housing I think they only had the 2 sizes Reg and the large don't know the size of ether. (size is at the fan not the Housing Size) Remember you have to get the whole housing kit or fab your own housing to change to the bigger squirrel cage. on the smaller pulley for the squirrel cage gear box you can also go with a bigger pulley at the engine. And look into Bigger Radiator core. Do you have a Mud Flap across the back of the coach? Are all the leaks around the Radiator sealed? Are all the Leaks around the squirrel cage doors Sealed? Many things to look at with Cooling a Coach Engine as they are in the back and do not have air coming strait at them from the fount. (Message edited by Robsedona on October 31, 2009) | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1729 Registered: 10-2003 Posted From: 71.58.71.157  Rating: N/A |
Remember that driving those larger fans is going to add more drag to the engine; may not matter if you have a 92 series. You should consider Rob's suggestions and also consider adding misters. Low cost and effective, since the heating is only on long hills. | ||
| Rob Norgren (Robsedona)
Registered Member Username: Robsedona Post Number: 168 Registered: 11-2007 Posted From: 75.208.25.87 Rating: N/A |
John you are right (Lots of moon madness with the Misters (Controversy)) LOL I think they can be a good way to go! If you have taken care of other problems First! Don't forget good fresh Antifreeze or the boost to make sure you are protected as DD calls for! Make sure you are not lugging on the hills and that you are running in the top of a Lower Gear and not the bottom of a High Gear! 71 and 92 both love to scream and nothing else! Put the peddle to the medal and keep it there I have also heard drive it as though you are MAD at it( slam your fingers in the door and Drive it !!!!!!!!!!!!!) | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1732 Registered: 12-2000 Posted From: 76.68.120.136  Rating: |
Before anything else, you need to confirm you aren't letting air get by the seals. The rubber bits and pieces around the rads will be withered, missing, torn, or otherwise allowing the suction of the fans to pull air around instead of through the rads. The seals on the fan door, and the rad access doors will be pulling air past, again, air past the rads, not through them. Are there any rusted holes through into the fan compartment? Another source of leak. A lit cigarette, citronella candle or other smoke producing device will give you some help in determining the sources. It takes relatively little leakage to tip the balance in favour of overheating. They all have to be sealed up to get the most out of the traditionally marginal MCI cooling system. I used the expanding foam in a can around the rads to put a stop to the foolishness. All four sides filled up from the inside to pretty much flush. The existing rubber bits act as a good base to work inward from. Be careful you don't accidentally fill the shutter with it! It will easily cut out at rad changing time, but I know there isn't air getting by there now! A strip of plain adhesive backed weather stripping foam strategically placed to seal the ends of the rads to the rad access doors. Duct tape the seams on the fan door to rule them out, until you decide on a better seal solution, (the MC8 seals are a horrible design, I'm going to do something different when I get around to it..) extend the tape across the seams beyond the door to the edges of the rads. And a chunk of rubber cut to block most of where the fan belt passes through into the fan compartment, as the original is likely gone too. Yes, one wonders what MCI was thinking.... happy coaching! buswarrior | ||
| Iver (Mciv)
Registered Member Username: Mciv Post Number: 23 Registered: 11-2006 Posted From: 70.69.131.252 Rating: N/A |
Yes, one wonders what MCI was thinking....I totally agree BW..... This coach has the large rads which is a good thing but I think I will take your advice and totally seal everything as suggested. I think before I change the pulley size I will pull the entire unit out and make sure it is in good shape to accommodate the faster rpm. It would be interesting to know if someone running a 8v92 with all the upgraded cooling recommendations can operate without overheating and not use misters. | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1637 Registered: 12-2000 Posted From: 67.182.48.162  Rating: N/A |
Iver - The charter bus outfit I worked for in the mid-80's had several MCIs with 8V92s, and I never had any overheating problems with them. Even in the hot summers going to Las Vegas thru the Mojave Desert. These buses were all dead stock - no gimmicks like misters on them. If the cooling system maintenance has been done properly, and you drive them correctly, you shouldn't have shut-down issues. BTDT, FWIW & HTH. . .  | ||
| Iver (Mciv)
Registered Member Username: Mciv Post Number: 25 Registered: 11-2006 Posted From: 70.69.131.252 Rating: N/A |
RJ, Thank you. That is exactly what I wanted to hear. I plan to make the existing system work as efficiently as I possibly can. Then using all the tips I have heard so far about driving, I'll do my best to keep the heat out... Just one more question..... How close do the rubber inlet rings on the outside of the housings have to be to the center of the squirrel cage. When the drive belt stretches a little the cages move upward when the belt is tightened. There is some adjustment up and down on the inlet rings but not much. I would be happy if I could keep the rubber rings totally centered in the fans if possible. Thanks, Iver. |
