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REFUELING
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Re: Detroit Diesel swap
dsldriver #1402971 Thu Mar 25 2021 03:15 PM
Joined: Nov 1995
Posts: 5,073
J
Unrepentant VW Lover
Evan -- That's the only way you *could* drive a 2 cycle Green Leaker. Otherwise it would over heat or you couldn't shift it. At least for the 71 - Series, they only ran happy if they were against the governor (2300 RPM). I'm not sure about leaking -- AMTRAKJoe can corroborate this as he rode with me. But on the trip out and back to Kansas city a few years ago (1,400 miles, all Interstate 2300 RPM most of the time, screaming happilly) ... on the trip home, we topped off the oil in KC. When we got to White's (Racine, VA) two days later to refuel, we did not need oil and the engine wasn't leaking. Once we got home and the truck sat for a week, it started leaking again -- about the same time our hearing returned ...

The transmission was seeping a little, though ...

In my limited experience (with one 6-71), that engine was happiest when it was wound all the way up and kept there. 2300 rpm, 62 MPH all day long. It used less fuel, it didn't burn oil and it didn't leak. For people used to lesser engines that don't like the top end, it might take some getting used to. wink

2 cycle Detroits -- drive 'em like you stole 'em and they'll love you long time.

Last edited by John Milliman; Thu Mar 25 2021 03:18 PM.

John

"Of all tyrannies a tyranny sincerely exercised for the good of its victims may be the most oppressive."
— C. S. Lewis


'49 Chevrolet 3804

Re: Detroit Diesel swap
dsldriver #1403018 Thu Mar 25 2021 09:10 PM
Joined: Oct 2015
Posts: 324
P
'Bolter
I drove many Detroit powered trucks in various conditions , from highway to logging trucks in the bush . The 71 series like 671 and 8 v 71 even the twin 8v71 making v 16n's in the 50 ton rock trucks recommended rpm was 1700 to 2300 . I knew a guy that ran a 8v71 up to 2700 and never heard of him blowing it up . In logging form a 671 T I drove with a duplex trans with a flexible governor on serious grades required shifting only the main trans on steeper grades dropping 3 gears at a time in the prosses to keep it in the power band.
These motors were not like the current ones where a driver can get on a highway put it in cruise and let it go for a thousand miles without shifting .
At one point in the late 70's I was driving a truck with a 671 inline in eastern Canada and dropped and exhaust valve . I parked it on the side of a two lane road got a ride to a maw and paw truck stop ,spoke to the mechanic there who called his brother a local farmer who swung by with his John Deere ,towed the truck to the truck stop we dropped the trailer dragged the tractor to his farm stuck it in a barn ,gave me a room to sleep as I'd been up about 24 hours at this point and the farmer along with is brother over the course of that night replaced the valve along with the piston and sleeve in the damaged cylinder and I was on the road at noon the next day.
Yes they are noisy and leak oil and not all that powerful , but in the right hands they will go on forever .

John


good planning is no substitute for dumb luck
Re: Detroit Diesel swap
dsldriver #1403038 Fri Mar 26 2021 12:01 AM
Joined: Feb 2004
Posts: 22,578
H
'Bolter
Detroits and old Harley Davidsons- - - -when they quit leaking, add oil- - - - -they're empty! I'll have to admit, though- - - -the 97 EVO engine in my Soft Tail doesn't leak! Maybe that's why Harley replaced it with the Twin Cam!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Detroit Diesel swap
dsldriver #1403222 Sat Mar 27 2021 02:46 AM
Joined: Sep 2020
Posts: 40
G
Wrench Fetcher
Looked at putting in a 3126, those motors are pretty good size. Would take major mods to get it in a 42 1 1/2 ton. It's longer and wider than the engine bay.


Bah
Re: Detroit Diesel swap
dsldriver #1403257 Sat Mar 27 2021 01:08 PM
Joined: Jun 2011
Posts: 4,119
E
'Bolter
Precious room in front of the radiator for an I’cooler in the ‘42, also.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Detroit Diesel swap
dsldriver #1403420 Sun Mar 28 2021 02:14 PM
Joined: May 2005
Posts: 9,175
G
.
Back to the original intent of this thread.

You mention your 3-53 engine has an SAE #4 housing. Depending on what transmission you choose you might have more luck with a SAE #3 housing on the engine.
Original 53 series flywheels that fit automotive type clutches are sometimes hard to find and when you do they are usually SAE #2 or #3 size (possibly always, not sure).

It may be possible to modify one of the hundreds of different other 53 series flywheels to fit a clutch suitable for your new application, but it's generally easier to do conversions with ready made parts and avoid machine work when possible.

Before getting to far into wrenching on your conversion start trying to plan dozens of steps ahead in an effort to sort out as many of the big issues before they're actually issues.


1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: Detroit Diesel swap
dsldriver #1403749 Tue Mar 30 2021 02:42 AM
Joined: Apr 2003
Posts: 918
C
Shop Shark
I had a 6V-53 and still have a 2-53. Like them all, the 53, 71 and 92 Series.

The smallest one is a 1-71, biggest one I know of is a 20V-149.

Although I've seen some with just a 4-Speed, I agree, the more gears the better, but 8 to 10 Speeds with a 53 Series is plenty good enough.


'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
Re: Detroit Diesel swap
dsldriver #1404325 Fri Apr 02 2021 12:11 AM
Joined: Jul 2014
Posts: 284
1
'Bolter
Coast-to-coast, herding an 8V-71 is likely why I need hearing aids today. Wear your earplugs!


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Detroit Diesel swap
1Ton_tommy #1404338 Fri Apr 02 2021 01:40 AM
Joined: Oct 2015
Posts: 324
P
'Bolter
Originally Posted by 1Ton_tommy
Coast-to-coast, herding an 8V-71 is likely why I need hearing aids today. Wear your earplugs!

Was even better when the pipes were bolted directly to the corner of the cab .

John


good planning is no substitute for dumb luck
Re: Detroit Diesel swap
dsldriver #1404343 Fri Apr 02 2021 02:02 AM
Joined: Feb 2004
Posts: 22,578
H
'Bolter
Freightliner cabovers, 318 Detroits, and the Grapevine hill- - - - -"When I die I'm going to Heaven- - - -I've spent my time in the other place already!"
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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