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Author Topic: 6-71 diesel  (Read 3022 times)

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Offline dgdrls

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Re: 6-71 diesel
« Reply #40 on: September 01, 2017, 09:59:06 pm »
Nobodies mentioned it so maybe I'm way out in left field. I notice that screamer being run at 1500rpm. Any Detroit I've run and any mechanic I've been taught by says that those old detroits should not be laboured or loaded below 1900rpm. On our old truck (1980 Ford L8000 w/6-71N) it is very noticeable that as soon as you work the engine below 1800rpm temperature rises quickly. From what I remember exhaust temps rise very high (over 1200F) when you get into those lower rpms. I know there's some experts on here and I'm not trying to be one just offering my tidbit.

I agree, 1500 loaded seems too slow for a 2 cycle Detroit.
I would reach-out to DD or MTU for advise on optimum operating RPM range.

D

Offline Satamax

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Re: 6-71 diesel
« Reply #41 on: September 01, 2017, 11:14:38 pm »
Well. It's a gen set. So no choice!

I'm finding informations on the motor change.

It's not simple, single bearing alternator.  Seems to be sae#2 or something close on the GM. Sae#1 on the unic. Adapter is a welded thing. Dont know if there's a centering lip. I have enough meat to redrill for sae#1. The latest question is the coupling. The udea is growing on me. Only prob. Lack of time!
French CD4 sawmill. Latil TL 73. Self moving hydraulic crane. Iveco daily 4x4 lwb.

Offline Satamax

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Re: 6-71 diesel
« Reply #42 on: October 08, 2017, 03:10:17 am »
I'm a dimwit!

Last time i tried to saw, i didn't pay attention, hertz were good. But yesyerday, i checked with the dmm. And my voltage was way off! 257vac, when it should be normally around 380. So i raised the presets a notch. Checked again,  376vac, and 53hz. (50 normally here) So i was all good. Sawed all afternoon. Didn't rise above 95 celsius. So, grizzly was partially right. I think, running a 29kw motor, meant for 380,  on 257 volts was loading the engine too.

Thanks guys!
French CD4 sawmill. Latil TL 73. Self moving hydraulic crane. Iveco daily 4x4 lwb.

Offline Grizzly

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Re: 6-71 diesel
« Reply #43 on: October 08, 2017, 05:36:23 pm »
I'm a dimwit!

Don'tcha hate days like that!!  :D
2011 - Logmaster LM-2 / Chinese wheel loader
Jonsered saws
   2149 - 111S - 90?
Cooks Cat Claw & Dual tooth setter
2000 Miners 3-31 Board Edger

Offline Satamax

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Re: 6-71 diesel
« Reply #44 on: October 09, 2017, 02:59:25 am »
French CD4 sawmill. Latil TL 73. Self moving hydraulic crane. Iveco daily 4x4 lwb.