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[GMCnet] Running - on jackstands [message #271024]

Mon, 02 February 2015 09:47

Dolph Santorine

Messages: 1236
Registered: April 2011
Location: Wheeling, WV

Karma: -41

Senior Member

I have build a pair of jack stands that are incredibly stout - so much so that I don’t worry about running the engine on the coach when the front wheels are off the ground.

I’m considering trouble shooting the cruise by running it with the front end up (and no tires).

Thoughts?

Thanks.

Dolph

DE N8JPC

Wheeling, West Virginia

1977 GMC 26' Palm Beach
TZE167V100820

1976 GMC 26' Donor Coach
TZE166V101610

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Re: [GMCnet] Running - on jackstands [message #271030 is a reply to message #271024]

Mon, 02 February 2015 11:28

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

Probably won't work, because there is no load on the system. The slightest increase in throttle will cause it to overspeed and the system will react with too much action for the load on the engine. It can break stuff. You can see if it engages but you need to be at the controls to shut it down once it starts to oscillate.

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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Re: [GMCnet] Running - on jackstands [message #271036 is a reply to message #271024]

Mon, 02 February 2015 11:45

midlf

Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)

Karma: 1

Senior Member

I agree with the comment on needing caution when running on jackstands.

Of you want "stout" jack stands look here:

http://www.gmcmhphotos.com/photos/g5461-12-ton-jack-stands.html

Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

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Re: [GMCnet] Running - on jackstands [message #271041 is a reply to message #271036]

Mon, 02 February 2015 12:53

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

as log as you are supporting the A Arms so the CV joint angle is not too severe you should be ok. As long as you don't hammer it...
Letting the a arms droop all the way would be unwise I believe, but probably not catastrophic. I mean I know I've had that happen while driving, that Has to be worse

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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Re: [GMCnet] Running - on jackstands [message #271052 is a reply to message #271024]

Mon, 02 February 2015 15:41

Broham

Messages: 204
Registered: March 2013
Location: Detroit, Michigan

Karma: 0

Senior Member

If you really want to test the CC in the shop, I would disconnect the speedo to transducer cable and run the transducer with a drill. 1000 RPM or so should be enough to engage the system.

good luck

Todd Owner of a 1976 Eleganza II 26’ other toys: 93 Vette 84 Goldwing and gone but not forgotten 72 CB750 Chopper 96 Caprice Classic 34 Ford roadster 94 Fleetwood

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Re: [GMCnet] Running - on jackstands [message #271068 is a reply to message #271024]

Mon, 02 February 2015 18:22

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Dolph Santorine wrote on Mon, 02 February 2015 10:47

I have build a pair of jack stands that are incredibly stout - so much so that I don't worry about running the engine on the coach when the front wheels are off the ground.

I'm considering trouble shooting the cruise by running it with the front end up (and no tires).

Thoughts?

Thanks.

Dolph

Dolph,

The best you will get out of it (testing the way you describe) will be essentially a Yes/No.
It will open the throttle below the set point and open it above. This all happen in a fashion that will not allow you to effective diagnose anything.
We tried to use one on a chassis dyno test and it was useless without the inertia.

Good Luck

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] Running - on jackstands [message #271071 is a reply to message #271068]

Mon, 02 February 2015 18:42

Dolph Santorine

Messages: 1236
Registered: April 2011
Location: Wheeling, WV

Karma: -41

Senior Member

That's precisely the data I was looking for - thanks.

Dolph Santorine

Dolph@DolphSantorine.com

Excuse me for not being my usual wordy and sporadically verbose self. This message is sent from my iPhone.

No trees were killed in the sending of this message and few long dead dinosaurs were involved. A large number of electrons were terribly inconvenienced.

> On Feb 2, 2015, at 7:22 PM, Matt Colie wrote:
>
> Dolph Santorine wrote on Mon, 02 February 2015 10:47
>> I have build a pair of jack stands that are incredibly stout - so much so that I don't worry about running the engine on the coach when the front
>> wheels are off the ground.
>>
>> I'm considering trouble shooting the cruise by running it with the front end up (and no tires).
>>
>> Thoughts?
>>
>> Thanks.
>>
>> Dolph
>
> Dolph,
>
> The best you will get out of it (testing the way you describe) will be essentially a Yes/No.
> It will open the throttle below the set point and open it above. This all happen in a fashion that will not allow you to effective diagnose anything.
>
> We tried to use one on a chassis dyno test and it was useless without the inertia.
>
> Good Luck
>
> Matt
> --
> Matt & Mary Colie - Members GMCMI, GMCES
> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Re: [GMCnet] Running - on jackstands [message #271072 is a reply to message #271024]

Mon, 02 February 2015 19:04

Bob de Kruyff

Messages: 4260
Registered: January 2004
Location: Chandler, AZ

Karma: 1

Senior Member

Dolph Santorine wrote on Mon, 02 February 2015 08:47

I have build a pair of jack stands that are incredibly stout - so much so that I don't worry about running the engine on the coach when the front wheels are off the ground.

I'm considering trouble shooting the cruise by running it with the front end up (and no tires).

Thoughts?

Thanks.

Dolph

DE N8JPC

Wheeling, West Virginia

1977 GMC 26' Palm Beach
TZE167V100820

1976 GMC 26' Donor Coach
TZE166V101610

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I've done this on several vehicles except with the wheels on. Without the inertia of the wheels, the system may react too quickly but will give you a rough indication. What you need to be careful of is the possibility of burning up the diff if one brake assembly drags a bit more than the other. A slight drag will cause the other side to spin rapidly and potentially ruin the differential. If you run with the wheels on, you will be able to watch this closely.

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: [GMCnet] Running - on jackstands [message #271083 is a reply to message #271024]

Mon, 02 February 2015 17:48

powwerjon

Messages: 849
Registered: March 2013

Karma: -2

Senior Member

Dolph,
We run our coach on jack stands all the time. I have 4T stands that I use for the from and 12T stands that I use for the back. As long as the use properly rated equipment then there should be no issues running and testing your coach. Our is up on stands when we do maintenance on it. I probably spend as much time under the coach as I do from the top. In the Fall we do a complete check and do updates at that time over a6 week period.

J.R. Wright
30' Buskirk Stretch
Michigan
On Location in Tucson

> On Feb 2, 2015, at 8:47 AM, Dolph Santorine wrote:
>
> I have build a pair of jack stands that are incredibly stout - so much so that I don’t worry about running the engine on the coach when the front wheels are off the ground.
>
> I’m considering trouble shooting the cruise by running it with the front end up (and no tires).
>
> Thoughts?
>
> Thanks.
>
>
> Dolph
>
> DE N8JPC
>
> Wheeling, West Virginia
>
> 1977 GMC 26' Palm Beach
> TZE167V100820
>
> 1976 GMC 26' Donor Coach
> TZE166V101610
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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