Author Topic: Our GM 4103  (Read 12388 times)

Offline DMoedave

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Re: Our GM 4103
« Reply #15 on: April 02, 2011, 04:26:12 AM »
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!
we love our buses!!! NE Pa or LI NY, or somewhere in between!

Offline eddieboy

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Re: Our GM 4103
« Reply #16 on: April 02, 2011, 05:08:34 AM »
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
Ed Spohr/1962 PD4106/8V71/4Speed/Zion,Ill/Far North East Corner of Illinois

Offline 2xclutchin

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Re: Our GM 4103
« Reply #17 on: April 14, 2011, 02:41:33 PM »
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  ;D lol.
Thanks,
          Mike
Its the 6-71 btw.
« Last Edit: April 14, 2011, 03:41:07 PM by 2xclutchin »
Mike
Nothing beats a 2-Stroke
1952 MoPac GM PD-4103-1353 6-71 DD 4 speed
Work in progress
Thief River Falls, MN

Offline lostagain

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Re: Our GM 4103
« Reply #18 on: April 14, 2011, 04:26:44 PM »
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
JC
Blackie AB
1977 MC5C, 6V92/HT740

Offline Rick59-4104

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Re: Our GM 4103
« Reply #19 on: April 14, 2011, 04:34:17 PM »
 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
« Last Edit: April 14, 2011, 04:37:11 PM by Rick59-4104 »
NW Arkansas
1959 GM 4104  No. 4115
1972 Grumman Kurbmaster Stepvan Conversion
1957 Airstream 13 panel Overlander

Offline 2xclutchin

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Re: Our GM 4103
« Reply #20 on: April 14, 2011, 04:35:27 PM »
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
Mike
Nothing beats a 2-Stroke
1952 MoPac GM PD-4103-1353 6-71 DD 4 speed
Work in progress
Thief River Falls, MN

Offline Rick59-4104

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Re: Our GM 4103
« Reply #21 on: April 14, 2011, 04:39:33 PM »
 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
NW Arkansas
1959 GM 4104  No. 4115
1972 Grumman Kurbmaster Stepvan Conversion
1957 Airstream 13 panel Overlander

Offline 2xclutchin

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Re: Our GM 4103
« Reply #22 on: April 14, 2011, 04:53:14 PM »
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  ;D
Thanks,
         Mike
Mike
Nothing beats a 2-Stroke
1952 MoPac GM PD-4103-1353 6-71 DD 4 speed
Work in progress
Thief River Falls, MN

Offline Barn Owl

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Re: Our GM 4103
« Reply #23 on: April 14, 2011, 08:15:30 PM »
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.
L. Christley - W3EYE Amateur Extra
Blue Ridge Mountains, S.W. Virginia
It’s the education gained, and the ability to apply, and share, what we learn.
Have fun, be great, that way you have Great Fun!

Offline happycamperbrat

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Re: Our GM 4103
« Reply #24 on: April 14, 2011, 11:25:16 PM »
19? Right On! Welcome to the group!  ;D You might be the youngest bus nut ever with a bus of his own!
The Little GTO is a 102" wide and 40' long 1983 GMC RTS II and my name is Teresa in case I forgot to sign my post

Offline 2xclutchin

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Re: Our GM 4103
« Reply #25 on: April 15, 2011, 02:34:54 PM »
Well I actually traded my model A John deere to my dad for a share of it. lol  ;D
Thanks,
          Mike
Mike
Nothing beats a 2-Stroke
1952 MoPac GM PD-4103-1353 6-71 DD 4 speed
Work in progress
Thief River Falls, MN