Our GM 4103

[DMoedave]

The door has a top and bottom latch actuated by the center handle. If you can get a square piece of stock or a vise grip to grab the mechanism and turn it to the left (from the inside of course). the lever arm that goes on this is about 14 to 18" so it has some leverage. the "locks" fit into holes in the door frame. someone may have to push in on the door from the outside to help you turn easier. The rear door is so nice!

[eddieboy]

For parts, I found John at www.busfixx.com to be very helpful. There is a downloadable catalog.  I found parts for my 1964 PD4106 and John seemed to know what I needed as I was asking about the items.  For instance, I was looking for a fuel sender and a gauge.  he asked me right off the bat if the tank had a little plate with 5 screws in it.  He was right on the money.  Prices seemed fair as well.  Welcome to the insanity and good luck.
Ed

[2xclutchin]

Hello everyone,
Well on Tuesday I decided to take her out for a quick drive around the local country side. Started wonderful, smoked but it cleared up. So I take off drive down the road a few miles, then decide to turn onto a gravel road to check everything out. Opened the engine compartment and the oil pressure is sitting at 20. I then proceded to take the quickest route to the parking spot and park, before shutting it off though i went back and checked everything out now the oil pressure is at 23. What is the average? I know i read that they are supposed to have 50psi at idle. Otherwise everything went great, almost got shifting down too   lol.
Thanks,
          Mike
Its the 6-71 btw.

[lostagain]

2xclutchin,

was the bus iddling when you saw the 20 psi ?

If so, that is good. Some DDs show even no press. at iddle. As long as you have 40 or 50 psi going down the road on the governor, you're doing good.

JC

[Rick59-4104]

 Hello Mike,
 My 4104 at low idle will have very little pressure....I think the book says somewhere about 5 lbs, at fast idle it should have more, going down the road I have 45 to 55...

 Don't know where you saw 50 at idle but I don't think so....Do you have a gauge in the cockpit?

Rick

[2xclutchin]

Yes it was at idle, the oil pressure gauge in the cab actually does not work though so down the road i have no idea.
Thanks,
          Mike

[Rick59-4104]

 If you had 20 at idle I would think no problem, it would make me really nervous not to have a gauge you can look at going down the road...

Rick

[2xclutchin]

Yes, that will be addressed. Well it's good to know that its not bad, just goes to show how internet searches are not the most reliable lol. Oh I almost forgot, we were digging in the defroster area, and noticed a old black box, so of course we opened it and it is what appears to be the first aid kit assigned to the bus. A long time ago judging by the contents, almost complete to 
Thanks,
         Mike

[Barn Owl]

Below is directly out of a GM 4106 operator’s manual:


Normal readings with engine hot are:

Idling – 4 pounds minimum.
Governed speed – 25 pounds minimum.

Engine must not be operated when oil pressure falls below 25 pounds at governed speed under full load. If oil pressure falls below 3 pounds, the “LOW OIL” tell-tale will light and buzzer will sound.

[happycamperbrat]

19? Right On! Welcome to the group!  You might be the youngest bus nut ever with a bus of his own!

[2xclutchin]

Well I actually traded my model A John deere to my dad for a share of it. lol 
Thanks,
          Mike