| Author | Message | ||
| Larry & Lynne Dixon (Larry_d)
Registered Member Username: Larry_d Post Number: 135 Registered: 7-2005 Posted From: 71.111.188.44  Rating: N/A |
Hello warmed up enough to get into the opening at rear of coach, 4905, got the ft by 2ft door off and looked in finding two water type on off valves wondering if these shut water off from radaiator to engine, can anyone tell me, da book and I don't seem to get along. maybe they were not original. Thank you very much Larry | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 631 Registered: 11-2005 Posted From: 68.105.143.250  Rating: N/A |
On GMCs these usually shut off the original bus defroster and heating system. | ||
| James Stacy (Jimstacy)
Registered Member Username: Jimstacy Post Number: 129 Registered: 1-2001 Posted From: 76.248.100.46 Rating: N/A |
Found on many buses, they allow the driver to turn off the hot water to the heater, so AC works better. Jim Stacy | ||
| Larry & Lynne Dixon (Larry_d)
Registered Member Username: Larry_d Post Number: 136 Registered: 7-2005 Posted From: 71.111.188.44 Rating: N/A |
Thanks all I do also have a shut off for the front heater near the floor in the middle of the dash, which must do the same thing, is that rite. This one in the front I turn on if the engine starts to get quite hot,which they said increased surculation. I am happy for the info as I have so much to learn and never learn enough. thanks Larry | ||
| Glenn Williams (Glenn)
Registered Member Username: Glenn Post Number: 151 Registered: 6-2006 Posted From: 216.163.57.205  Rating: N/A |
Larry, Are these two valves in the middle of the bus (from left to right)attached to the front of the engine bay? If we are talking about the same valves, these shut off coolant flow to the heaters, and also stop the return flow of coolant to the engine. Good Luck! | ||
| David Evans (Dmd)
Registered Member Username: Dmd Post Number: 233 Registered: 10-2004 Posted From: 72.89.73.18  Rating: N/A |
On some of the older GM coaches these are for the nitrous oxide bottles located just foward of the bulkhead. You can regulate the amount of flow by adjusting the valves. On our coach the "juice" kicks in only under full throttle and with the far left button on the dash depressed. Your bottle could be either MT or removed. It makes a big difference on our 4-71 in passing situations and on ramps. | ||
| Larry & Lynne Dixon (Larry_d)
Registered Member Username: Larry_d Post Number: 137 Registered: 7-2005 Posted From: 71.111.188.44 Rating: N/A |
Glen;;; That is where they are. This is the first time I have seen this part of the engine and bus. Sure does put me a long way from the starter, Oh well have gotten this far and may have some time to look it all over better. The old girl still doesn't start and that is where I am headed, checking wirres and such. Thank youall again sure like all of the come back. Larry | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 280 Registered: 10-2006 Posted From: 66.90.226.106 Rating: N/A |
The valves on the bulkhead were to speed the engine changes or to allow the coach engine to operate with a defect in the Pax area heating system. FF. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 634 Registered: 11-2005 Posted From: 68.105.143.250 Rating: N/A |
If I ever have to change these valves on my 4104 I'm going to replace them with 1/4 turn SS ball valves to eliminate all that turning. A note; these valves should be operated once in a while to keep them free from sticking when they are really needed in case of leaks and such. | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 963 Registered: 10-2003 Posted From: 71.58.48.5  Rating: N/A |
David, I think that the nitrous in your coach must be leaking into the driver's area. Quick!!!! get out fast and get some oxygen. | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1236 Registered: 12-2000 Posted From: 76.68.133.166  Rating: |
An old plumbers tip: When leaving a gate valve open, twist open all the way, and then turn it back a half rotation, so it is not jammed against the end when it seizes from lack of use, and you may successfully free it by leaning both ways without breaking it against the stops. happy coaching! buswarrior |
