Here I am

2-Stroke Diesel in Mexico?

Attention: TDR Forum Junkies
To the point: Click this link and check out the Front Page News story(ies) where we are tracking the introduction of the 2025 Ram HD trucks.

Thanks, TDR Staff

1st gen dually coming up for sale

Brand new ISB 6.7L showed up last week...

Ozymandias

TDR MEMBER
Down here I noticed that a lot of the Class8 Trucks sound very special, even Uphill they sound like on a Jake Brake.
Is this 2 Stroke?

Weird noise, at night one thinks a Helicopter is approaching.
 
A company I worked for years ago had a Galion neck breaker with a 471, it was an oil leaking pig that made more noise than power. The air intake was routed behind the operators seat with a manual knife gate shut off just in case....and it did get used occasionally :D

Whereabouts are you guys at Ozy? Hope all is well.
 
We had 2 Mountain Logger ML130 Skidders with the 453 Detroit and a Prentice 410 Log Loader with the 453. One day I had my youngest son with me when I was loading a truck, he was about 3 years old. He asked me if the loader motor was the same as the skidder. I said yes, how do you know that? He said "because it hears the same", I will never forget that:D
 
Im sure there are alot of older 2 stroke Detroits running around down there, cool engines that use a supercharger and turbocharger just not the most reliable and expensive to fix.

"just not the most reliable and expensive to fix" do you have any first hand knowledge on that front. The reason they have been phased out is because their emissions are off the chart and it has nothing to do with reliability. As they actually quite reliable and easy to work on. And a marvel of engineering, with a symmetrical block that can be turned end to end for a mirror image engine the is left hand. When the 92 series came along much later they made pretty good power.

I drove a recycled class 8 Titan 90 Chevy that been a beer tractor. I forgot the number of hundreds of thousands of miles it had on it, however I drove in everyday for three years hauling 8500 gals for gas and diesel, we never turned a bolt of the engine. Screaming Jimmy with a 13 speed road ranger transmission, hit the governor at 2100-2200 and grab another gear(at 1900) and then back against the governor again. This was from 1976-79.

As a kid we got a surplus 6-71 from the Navy for our Sea Scout ship. We installed it ourselves. It had 90 injectors in it and we burned down to pistons racing to local USCG 40er one to many times. We pulled the head, jacked up the front of the engine right there in the old 38 foot Coast Guard Picket boat, dropped the pan and put in new pistons and liners for those two cylinders. Put it back together with high lift 70 injectors. All this with my dad as skipper and a first mate who ran an auto repair shop in town, and a group of kids learning about what makes a Detroit Diesel tick.
 
"just not the most reliable and expensive to fix" do you have any first hand knowledge on that front.

Ya actually I do, was a field service heavy equipment mechanic , worked on a few and know people that worked on them heavily in the late 70s and 80s. Amazing how fast they could R&R Terex scraper engine packs but when they had to do it as part of regular maintenance I guess you get good at it.

Im not saying they arent great engines and can be tough as hell but thats not all of them, kinda like the Ford/Internationals 6.no.
 
Back in my marine days, we had a couple of work boats that had Detroits in them. One was a 1938 tagged as a Gray Marine. One of the first 6-71’s ever made as I was told.
 
Still running 16-71’s on gen sets where I work they just run. Granted when they stop leaking you know it’s time to add oil...
I worked for Ingram eqoh S A tx 81 To 85rrebuildingDetroits.
53 71 series 6 12v 16v 92 & one 149 with a couple of 1710 Cummins mixed in Loved it
See pic of steamer on your post I'm a Mr of NKPPHTS Saw 765 in New Hav3n In last wk. She's a beauty!!!!
 
I worked for Ingram eqoh S A tx 81 To 85rrebuildingDetroits.
53 71 series 6 12v 16v 92 & one 149 with a couple of 1710 Cummins mixed in Loved it
See pic of steamer on your post I'm a Mr of NKPPHTS Saw 765 in New Hav3n In last wk. She's a beauty!!!!
Fhohn correction -
I worked for Ingram EQIP San Antonio, tx from 81- 85 rebuilding Detroits.
53 71 series 6 12v 16v 92 & one 149 with a couple of 1710 Cummins mixed in Loved it
See pic of steamer on your post I'm a MBR of NKPHTS Saw 765 in New Haven, IN last wk. She's a beauty!!!!
 
Last edited:
Ya actually I do, was a field service heavy equipment mechanic , worked on a few and know people that worked on them heavily in the late 70s and 80s. Amazing how fast they could R&R Terex scraper engine packs but when they had to do it as part of regular maintenance I guess you get good at it.

Im not saying they arent great engines and can be tough as hell but thats not all of them, kinda like the Ford/Internationals 6.no.

Parts back in the day were very reasonable, but after MTU got control of the two strokes the parts prices went nuts..

Many problems were caused by either excessive idling or running multi-viscosity oil.

Keep them *****es against the governor and straight weight 40 oil in the base...they will clock 10’s of thousands of happy engine hours.

Ozy, that is the engine that powered the construction of our highway infrastructure. Trucks, dozers, shovels, drill rigs, etc...most were powered by Series 53, 71 and in later years 92 Detroit’s.

Dirt simple fuel system, no injection pump. Only a fuel transfer pump. Fuel went into and out of the cylinder head in fuel rails.
Will find you some pictures.

Four exhaust valves (early versions only had two), no intake valves. So each cylinder has 3 rocker arms, two outside ones for exhaust and center one for the injector. Fuel tubes bring fuel from the rail to the injector and back to the fuel return rail..
 
Back
Top