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Vintage Diesel and Oil Stationary Engines Fairbanks Morse, Lister, Petter, Witte and other pump injected Diesel oil engines.

Vintage Diesel and Oil Stationary  Engines

1-71 Detroit Diesel (GM)


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  #221  
Old 02-03-2018, 08:58:08 AM
Sooty Jim Sooty Jim is offline
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Default Re: 1-71 Detroit Diesel (GM)

Practical Greasy Yoga... what fun!
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  #222  
Old 02-07-2018, 11:40:29 PM
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Default Re: 1-71 Detroit Diesel (GM)

Building up a 12V92TI marine engine from 3 parts engines. And yes there are a few parts in this engine that are original to my 1-71. Detroit Diesel interchangeability. ALClick image for larger version

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  #223  
Old 02-08-2018, 12:39:51 AM
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Default Re: 1-71 Detroit Diesel (GM)

What is the V angle on that? I recall the 12V71 is something odd like 62*. A two stroke, 60* V-12 with six throws on the crank always fires two cylinders at once. A 30* or 90* V angle would make for 12 evenly spaced power strokes. That would be electric - motor - smooth! And SWEET sounding!
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  #224  
Old 02-08-2018, 01:59:56 AM
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Default Re: 1-71 Detroit Diesel (GM)

I think the V angle of a 71 and 92 are the same. Will try and confirm. As every stroke is a power stroke on a two cycle in one revolution they fire very close to each other. Six rod journals and 12 rods. Typo on the 12-92 chart 1L on the second line should be 1R. AL Click image for larger version

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  #225  
Old 02-08-2018, 02:24:11 AM
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Default Re: 1-71 Detroit Diesel (GM)

Page two of the firing order chart has a lot going on in one turn of the crankshaft. AL Click image for larger version

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  #226  
Old 03-11-2018, 09:23:20 PM
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Plugged air boxes and covers on a 12V 92 marine engine. It dosen`t get much worse than this, but it was still running. Hard to stop a jimmy. Beautiful day out here today.Click image for larger version

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  #227  
Old 03-11-2018, 09:54:30 PM
Vanman Vanman is offline
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Default Re: 1-71 Detroit Diesel (GM)

Yikes! What causes that? I would think that a marine engine would be working too hard most of the time for it to be caused by hours upon hours of idling.
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  #228  
Old 03-11-2018, 10:26:31 PM
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tourist dinner cruise, Idle out idle in. They were also a bit lacking on their on the oil changes and maintenance. AL
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  #229  
Old 03-11-2018, 11:23:59 PM
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Default Re: 1-71 Detroit Diesel (GM)

Wow, that's sad. Poor Detroit.
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  #230  
Old 04-10-2018, 03:16:00 PM
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Changing the crankshaft front oil seal on a 8V 92 TAB marine engine. !!NOT A EASY JOB!! Seal leaking after 23 years of service. To break loose the outer tapered cone which holds the damper hub in place required some heavy duty tools.Click image for larger version

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  #231  
Old 04-10-2018, 03:43:47 PM
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Default Re: 1-71 detroit diesel (GM)

My genset 1-71 uses a limiting speed governor that has 2 positions, idle and no-load. I can actually vary the no-load by means of a cable that tensions the high speed spring to a small degree to fine tune to get the HZ cycles. The governor and rack setup are very much like modern 2 strokes.
As for the blower, mine has a nice flap which is just as precise as a gasoline carb has. It is controlled by linkage to a mechanical overspeed mechanism that trips it close. It can then be manually reset similar to later engines.
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  #232  
Old 04-10-2018, 04:03:09 PM
Bsessoms Bsessoms is offline
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Lightbulb Re: 1-71 Detroit Diesel (GM)

I have an 1950's allis chalmers dozer, with a bad starter. Terrible to get to check
out. It has the 2-71 diesel eng. I would like to remove the old foot push button
starter selenoid and have possibly an external selenoid like the ford setup?
Is this possible? I don't know if it has a mechanical arm to force the starter
gear into flywheel or not? Any one tried this Before? Thanks B.
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  #233  
Old 04-10-2018, 05:33:39 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: 1-71 Detroit Diesel (GM)

It depends on how many amps the starter takes. For a diesel, it may draw too much for the Ford solenoid to take. As for the starter itself - you need to see how the flywheel drive is actuated. Some depend strictly on starter armature torque, as the starter spins up - not exactly a Bendix drive.

Some have a pole show that is attracted by the field coil (as in the Ford type), and a completely separate solenoid that completes the starter motor power circuit. Others use the Delco-Remy type - an external solenoid, mounted to the starter itself, that combines the activation of the starter motor circuit, but also thrusts the Bendix drive into the flywheel. These can be activated by a simple momentary switch on the dash or by an ignition switch with a start position. The Ford and Delco systems are different! Ford uses a grounded circuit to activate the solenoid, GM (Delco) uses battery positive to activate.
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  #234  
Old 04-17-2018, 12:42:44 AM
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Default Re: 1-71 detroit diesel (GM)

Limiting speed governor control ---- I believe you have the same gov. that i have. It has three positions on the cover, shut down,idle and run. When you turn the control knob to increase the RPM it puts pressure on a plunger which makes contact with the idle speed adjustment needle. The more pressure on the idle spring and plunger go to the low speed weights and will give you more RPM. Hence the term HIGH IDLE. This part of the limiting speed gov works as a variable speed gov. The high speed weights and spring controls the no load RPM. When you run the generator at 1200 RPM it should be controlled by the low speed weights only. ( High idle) What timing pin did you use for the injector? ALOHA AL
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  #235  
Old 04-17-2018, 12:48:05 AM
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Default Re: 1-71 Detroit Diesel (GM)

My limiting speed governorClick image for larger version

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  #236  
Old 04-17-2018, 09:25:28 AM
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Default Re: 1-71 Detroit Diesel (GM)

If it is just a push button on top of the starter, my TD6 IH dozer has been converted to a Ford solenoid. A previous owner drilled & tapped a hole in the big copper contact & attached a cable to the solenoid. A push button on the dash, & it works fine.
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  #237  
Old 04-18-2018, 09:28:38 PM
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Default Re: 1-71 Detroit Diesel (GM)

DETROIT 12V 92TI HAD to change out a piston liner kit. Marine engines can be stuffed in some pretty tight places. I told the owner that a Sawzall would make the job go faster. He didn`t go for it. Got the job done Just made more $$$. ALClick image for larger version

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  #238  
Old 04-19-2018, 04:34:48 PM
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Default Re: 1-71 Detroit Diesel (GM)

Wow - that looks awful. Was there any other access to the engine - ie. did an enclosure get removed so that you could access the engine? If not, you're both a contortionist and a magician... 8-)
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  #239  
Old 04-19-2018, 10:05:17 PM
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Default Re: 1-71 Detroit Diesel (GM)

There was a craw space between the engines so access to the lower end was possible. The 92 has four heads. the bad piston was #2 left bank. The cast iron oil pan weighs about 100 pounds. There is a small access plate on the bottom of that pan that i was able to reach through to unbolt the connecting rod from that journal. Believe it or not i have seen worse. AL
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  #240  
Old 04-20-2018, 09:36:19 AM
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Default Re: 1-71 Detroit Diesel (GM)

I hope you get paid well for that, makes me hurt just to think about it...
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