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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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  #101  
Old 02-08-2017, 12:27:20 AM
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Default Re: 1-71 Detroit Diesel (GM)

Nice cross section view.Click image for larger version

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  #102  
Old 02-09-2017, 01:25:43 AM
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Default Re: 1-71 Detroit Diesel (GM)

Making gaskets out of 1/32 material. Position front seal (5114335) deeper so the lip has a good surface to work on. One could drive a LH orRH fuel pump by moving the fuel pump drive disc to the lower blower gear. It`s coming together. ALClick image for larger version

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  #103  
Old 02-09-2017, 02:28:41 AM
Vanman Vanman is offline
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Default Re: 1-71 Detroit Diesel (GM)

That's looking really good!

About the gaskets you're making- I need to make a somewhat simpler one for a cast iron rocker cover. I have heard that guys lay the gasket paper over the part, then tap along the edge with a hammer to score or cut the gasket paper, or at least mark it. Is this how you do yours? Or is there a better way?

Thanks,
Keith
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  #104  
Old 02-09-2017, 03:27:14 AM
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Default Re: 1-71 Detroit Diesel (GM)

I cut the gaskets with a small ball peen hammer. I use gasket cinch to hold it to part and cut it all with the hammer. On older 71`s and 53 series they used cork gaskets for the valve cover. I am going to experiment with cork. I will let you know how it works out. AL
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  #105  
Old 02-09-2017, 11:50:43 PM
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Default Re: 1-71 Detroit Diesel (GM)

Vanman, you got me motivated to make a valve cover gasket today. I used a detroit 4-53 valve cover gasket. Used the four corners and grafted straight pieces in to finish it off. It is made out of cork and rubber. Had to narrow it a bit to fitinto the cover groove.Click image for larger version

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  #106  
Old 02-10-2017, 12:53:35 AM
Vanman Vanman is offline
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Default Re: 1-71 Detroit Diesel (GM)

Well that certainly is cool!

Would you use a little gasket sealer at the points where the pieces butt together?
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  #107  
Old 02-10-2017, 02:07:06 AM
K-Tron K-Tron is offline
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Default Re: 1-71 Detroit Diesel (GM)

Keith, the 1-71 typically runs about 30psi oil pressure. When hot there is only so much oil that gets pumped to the top of the head. You probably do not need any real gasket sealer at all. Believe it or not, I have had the best results using 3M weatherstripping adhesive to bond the cork gaskets to the stamped steel valve covers on the 53's. A light film of oil to activate the cork is all that is needed to make the seal to the cylinder head. (It also makes removal of the valve cover much easier down the line) Although the original gasket (5150232) was cork, I may try something unconventional with mine. Hall-Scott for example used a graphite coated leather packing in between the cast aluminum valve cover and the cast iron head. Same principal as a 1-71, just much larger...It sure works well even with 100psi of oil pressure and oil squirting everywhere. Typically most of the leaks you will find on a 1-71 are from bad head gaskets, ripped blower to block gaskets, bad blower seals, or leaky fuel pumps.

Al, your 1-71 is really coming together nicely! Great progress and great pictures! It'll be as good as new before you know it. What is going on with the corner of your gear train cover? The casting did not look broken in the first couple pictures? Perhaps sealing the welded area with glyptal will prevent future oil seepage...It is so nice to see one of these all apart, these engines are so beautiful inside and out.

Chris
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  #108  
Old 02-10-2017, 02:32:35 AM
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Default Re: 1-71 Detroit Diesel (GM)

I cut the joints at 45 degrees and used gasket cinch (contact cement) to join them. Use a grinder to narrow the gasket. AL

Chris, Eagle eye I was wondering if anyone would notice it. There was a small crack in the housing and i welded it. External impact damage. Being in Pearl Harbor it could have been anything. a bullet, shrapnel, or rough handling by a fork lift driver. AL
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  #109  
Old 02-11-2017, 12:39:34 AM
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Default Re: 1-71 Detroit Diesel (GM)

Looking into the cam follower box. Push rods extend through the head and to the rocker arms. Adjusted the valves to 0.012 and the injector height at 1.460.
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  #110  
Old 02-11-2017, 09:56:24 AM
mschreiber mschreiber is offline
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Default Re: 1-71 Detroit Diesel (GM)

Quote:
Originally Posted by K-Tron View Post
Al, these engines are so beautiful inside and out.
Chris
i'd say neat, 'cause they don't shave their legs

K, i think we met at benardston a few years back…. maybe hudson valley sale. u been there? :wave
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  #111  
Old 02-11-2017, 10:55:24 PM
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Default Re: 1-71 Detroit Diesel (GM)

Made the last large gasket. Compression release lever mounted on the rocker box cover. UP released, Down normal. Getting the heavier iron in place:
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  #112  
Old 02-16-2017, 11:35:30 PM
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Default Re: 1-71 Detroit Diesel (GM)

Mounted fan and pulley hub assembly. As there are only bushings in the hub and it requires an oil supply for lubrication (note fill screw) The engine is looking more vintage.
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  #113  
Old 02-16-2017, 11:46:53 PM
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Default Re: 1-71 Detroit Diesel (GM)

What's the drive ratio to the fan? Was wondering how fast it runs and how noisy it might be. From my recollection of watching a 171 driven generator, most of the noise seemed to be the usual diesel knock.
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  #114  
Old 02-17-2017, 02:53:11 AM
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Default Re: 1-71 Detroit Diesel (GM)

Vanman, Will check the pulley diameters and let you know. Engine noise, You know that you have a good Detroit two cycle when at idle you can here the sound of glass milk bottles bouncing on concrete. Most of us who use SMOKSTAK remember glass milk bottles. Aloha AL
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  #115  
Old 02-18-2017, 12:51:45 AM
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Default Re: 1-71 Detroit Diesel (GM)

.Vanman, The crankshaft pulley in 6 inches and the hub is 4 inches. That would make it a .step up of 1 to 1 3/4 i think. The fan is a suction type.
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  #116  
Old 02-18-2017, 09:35:26 PM
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Default Re: 1-71 Detroit Diesel (GM)

The oil pump is external and driven by a gear on the camshaft. The pick up tube fits into a passage in the block. The oil pump gears are like new. (maybe they are.) Not bad for 75 year old iron. Upon reassembly i had to make a double gasket out of parchment paper to the proper gear clearance.Click image for larger version

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  #117  
Old 02-18-2017, 11:39:30 PM
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Default Re: 1-71 Detroit Diesel (GM)

Looking great!

A 6" pulley driving a 4" would give a 1:1-1/2 ratio, so if your engine runs at 1200 rpm, the fan is doing 1800. Not to bad. That should be pretty quiet.
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  #118  
Old 02-22-2017, 12:57:53 PM
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Default Re: 1-71 Detroit Diesel (GM)

Time to get out of here and put the crankcase covers on. Has anyone been inside the crankcase of o large ship engine?Click image for larger version

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  #119  
Old 02-22-2017, 01:46:28 PM
Sooty Jim Sooty Jim is offline
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Default Re: 1-71 Detroit Diesel (GM)

Quote:
Originally Posted by the diesel doctor View Post
Time to get out of here and put the crankcase covers on. Has anyone been inside the crankcase of o large ship engine?Attachment 275603
Been in the cylinder and crankcase of an Atlas-Imperial (1200 hp, 100 ft tug) diesel we rebuilt in my Army Sailor days. Had to slice-n-dice the superstructure to gain access. Used to have a pic of me in the cylinder but haven't seen it in decades.
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  #120  
Old 02-26-2017, 11:57:26 AM
Cameano Cameano is offline
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Default Re: 1-71 Detroit Diesel (GM)

Just read this thread for the first time. I've worked on Detroits since the mid-80's, and have never heard of the 1-71. Fascinating and very informative! Thanks for posting!
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